WU Celimuge
| Department of Computer and Network Engineering | Professor |
| Cluster I (Informatics and Computer Engineering) | Professor |
| Fundamental Program for Advanced Engineering (Evening Course) | Professor |
| Advanced Wireless Communication Research Center | Professor |
| Meta-Networking Research Center | Professor |
Researcher Information
Research Keyword
Field Of Study
Educational Background
Member History
- May 2023 - Present
Associate Editor, Associate Editor of IEEE Transactions on Cognitive Communications and Networking, Society - Nov. 2022 - Present
Member, IEEE VTS Education Committee, Society - Jun. 2020 - Present
Chair, IEEE Technical Committee on Green Communications and Computing (TCGCC) Special Interest Group on Green Internet of Vehicles, Society - Jan. 2024 - Dec. 2024
Program Chair, The 9th IEEE Cyber Science and Technology Congress, Society - Jan. 2024 - Dec. 2024
Publicity Co-Chair, The 22nd IEEE International Conference on Pervasive Intelligence and Computing (PICom 2024), Society - May 2023 - Dec. 2024
TPC Co-Chair, TPC Co-Chair of IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, Society - Oct. 2023 - Sep. 2024
IEEE ComSoc Student Competition Committee Member, IEEE ComSoc, Society - Jul. 2023 - Sep. 2024
TPC Co-Chair, IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, Society - Oct. 2022 - Sep. 2024
Vice Chair (Asia Pacific), IEEE ComSoc Technical Committee on Big Data, Society - Jun. 2023 - Jun. 2024
Symposium Co-Chair, IEEE International Conference on Communications, Society - Jan. 2023 - Dec. 2023
General Chair, EAI MONAMI 2023 - 13th EAI International Conference on Mobile Networks and Management, Society - Jan. 2022 - Dec. 2023
Member, IEEE TCGCC Award Subcommittee, Society - Jan. 2021 - Dec. 2022
Member, Selection Committee of the IEEE ComSoc Student Competition, Society
Research Activity Information
Award
- May 2023
IEEE Communications Society
Exemplary Editor of the IEEE Transactions on Green Communications & Networking, Celimuge Wu - Dec. 2022
2022 IEEE Technical Committee on Hyper-Intelligence
Intelligent Resource Allocations for Internet of Vehicles
2022 IEEE Technical Committee on Hyper-Intelligence Award for Excellence (Middle Career Researcher), Celimuge Wu - Jan. 2022
IEEE Computer Society
"Federated Learning for Vehicular Internet of Things: Recent Advances and Open Issues," IEEE Open Journal of the Computer Society, vol. 1, pp. 45-61
2020 Best Paper Award for IEEE Open Journal of the Computer Society, Zhaoyang Du;Celimuge Wu;Tsutomu Yoshinaga;Kok-Lim Alvin Yau;Yusheng Ji;Jie Li
International academic award - Jan. 2022
IEEE
For outstanding service to TCGCC as SIG chair, events organization and TC promotion
IEEE ComSoc TCGCC (Technical Committee on Green Communications & Computing) Distinguished Service Award, Celimuge Wu
International society - Dec. 2021
EAI (European Alliance for Innovation)
Belgium
EAI Fellow, Celimuge Wu
Others - Dec. 2021
IEEE
For significant contributions made in furthering the objective of the society
IEEE TNSE (IEEE Transactions on Network Science and Engineering) Excellent Editor Award, Celimuge Wu
International society - Nov. 2021
IEEE
Optimized Computation Offloading Performance in Virtual Edge Computing Systems Via Deep Reinforcement Learning
2021 IEEE Internet of Things Journal Best Paper Award, Xianfu Chen;Honggang Zhang;Celimuge Wu;Shiwen Mao;Yusheng Ji;Medhi Bennis
International academic award - Oct. 2021
EAI MONAMI 2021 □ 11th EAI International Conference on Mobile Networks and Management
A Fuzzy Logic Controller for Greenhouse Temperature Regulation System Based on Edge Computing
EAI MONAMI 2021 Best System Paper Award, Yue Ren;Celimuge Wu;Tsutomu Yoshinaga;Wugedele Bao
International society - Sep. 2021
日本神経回路学会
視覚数理モデルシミュレーションの高速化と錯視画像の探索
日本神経回路学会優秀研究賞, 柳田悠介;佐藤俊治;策力木格;吉永努
International academic award - Jun. 2021
IEEE
Optimized Computation Offloading Performance in Virtual Edge Computing Systems Via Deep Reinforcement Learning
The IEEE Communications Society Outstanding Paper Award, Xianfu Chen;Honggang Zhang;Celimuge Wu;Shiwen Mao;Yusheng Ji;Medhi Bennis
International academic award - Nov. 2020
EAI MONAMI 2020 □ 10th EAI International Conference on Mobile Networks and Management
Distributed spectrum and power allocation for D2D-U Networks
EAI MONAMI 2020 Best paper award, Zhiqun Zou;Rui Yin;Celimuge Wu;Jiantao Yuan;Xianfu Chen
International society - Nov. 2020
IEEE Computer Society
"Enhancing Video QoE Over High-Speed Train Using Segment-Based Prefetching and Caching," IEEE MultiMedia, vol.26, no.4, 2019, pp. 55-66.
IEEE Computer Society 2019 Best Paper Award（Runner-Up）, Yue Cao;Ning Wang;Celimuge Wu;Xu Zhang;Chakkaphong Suthaputchakun
International academic award - Sep. 2019
IEICE Communications Society Distinguished Contributions Award
Japan society - Aug. 2019
IEEE CBDCOM 2019
Age of Information-Aware Multi-Tenant Resource Orchestration in Network Slicing
Best paper award, Xianfu Chen;Celimuge Wu;Tao Chen;Nan Wu;Honggang Zhang;Yusheng Ji
International society - Aug. 2019
IEEE CBDCOM 2019
Age of Information-Aware Multi-Tenant Resource Orchestration in Network Slicing
Best paper award: The 5th IEEE International Conference on Cloud and Big Data Computing (IEEE CBDCom 2019), Xianfu Chen;Celimuge Wu;Tao Chen;Nan Wu;Honggang Zhang;Yusheng Ji
International society - Dec. 2017
The Sixth International Conference on Communications, Computation, Networks and Technologies
A Solution for Bufferbloat Problem in Upload TCP Communication over IEEE 802.11n WLAN Only by Modifying Access Point
Best paper award, Masataka Nomoto;Celimuge Wu;Satoshi Ohzahata;Toshihiko Kato
International society - Dec. 2017
The Sixth International Conference on Communications, Computation, Networks and Technologies
A Solution for Bufferbloat Problem in Upload TCP Communication over IEEE 802.11n WLAN Only by Modifying Access Point
Best paper award: The Sixth International Conference on Communications, Computation, Networks and Technologies, Masataka Nomoto;Celimuge Wu;Satoshi Ohzahata;Toshihiko Kato
International society - Oct. 2017
IEICE Technical Committee on Network Systems
HVC: A Hybrid Cloud Computing Framework in Vehicular Environment
English Session Awards, Jingyun Feng;Zhi Liu;Celimuge Wu;Yusheng Ji
Japan society - Nov. 2016
The Fourth International Symposium on Computing and Networking (CANDAR)
A Light-weight Content Distribution Scheme for Cooperative Caching in Telco-CDNs
CANDAR Best/Outstanding Paper Award, Takuma Nakajima;Masato Yoshimi;Celimuge Wu;Tsutomu Yoshinaga
International society - Nov. 2016
The Fourth International Symposium on Computing and Networking (CANDAR)
A Light-weight Content Distribution Scheme for Cooperative Caching in Telco-CDNs
Best/Outstanding Paper Award: The Fourth International Symposium on Computing and Networking (CANDAR), Takuma Nakajima;Masato Yoshimi;Celimuge Wu;Tsutomu Yoshinaga
International society - Sep. 2016
IEICE Communications Society Distinguished Contributions Award
Japan society - Mar. 2011
FUNAI Foundation for Information Technology
IPSJ Digital Courier Funai Young Researcher Encouragement Award
Paper
- When Connected and Automated Vehicles Meet Mobile Crowdsensing: A Perception and Transmission Framework in the Metaverse
Xiaofei Yu; Chaowei Wang; Lexi Xu; Celimuge Wu; Ziye Wang; Yizhou He; Weidong Wang
IEEE Vehicular Technology Magazine, 18, 4, 22-34, Dec. 2023, Peer-reviwed
Scientific journal, English - Semantic Communication for Efficient Image Transmission Tasks based on Masked Autoencoders
Jiale Wu; Celimuge Wu; Yangfei Lin; Jingjing Bao; Zhaoyang Du; Lei Zhong; Xianfu Chen; Yusheng Ji
Corresponding, IEEE 98th Vehicular Technology Conference, 1-5, Oct. 2023, Peer-reviwed
International conference proceedings, English - Random Beam Switching: A Physical Layer Key Generation Approach to Safeguard mmWave Electronic Devices
Ying Ju; Guoxue Zou; Haowen Bai; Lei Liu 0031; Qingqi Pei; Celimuge Wu; Sattam Al Otaibi
IEEE Transactions on Consumer Electronics, 69, 3, 594-607, Aug. 2023, Peer-reviwed
Scientific journal, English - An Optimal Distributed Energy-Efficient Resource Scheduling for D2D-U Enabled Cellular Networks
Jiantao Yuan; Zheyi Wu; Rui Yin; Guangzhe Zhao; Xianfu Chen; Celimuge Wu
Last, IEEE Transactions on Cognitive Communications and Networking, 9, 4, 1053-1066, Aug. 2023, Peer-reviwed
Scientific journal, English - Guest Editorial Special Issue on Collaborative Intelligence for Green Internet of Things in the 6G Era
Celimuge Wu; Kok-Lim Alvin Yau; Zonghua Zhang; Damla Turgut; Shiwen Mao
Lead, IEEE Transactions on Green Communications and Networking, 7, 2, 855-856, Jun. 2023, Peer-reviwed
Scientific journal, English - Multiagent Meta-Reinforcement Learning for Optimized Task Scheduling in Heterogeneous Edge Computing Systems
Liwen Niu; Xianfu Chen; Ning Zhang 0007; Yongdong Zhu; Rui Yin 0001; Celimuge Wu; Yangjie Cao
IEEE Internet of Things Journal, 10, 12, 10519-10531, Jun. 2023, Peer-reviwed
Scientific journal, English - Blockchain-Enabled Internet of Vehicles Applications
Junting Gao; Chunrong Peng; Tsutomu Yoshinaga; Guorong Han; Siri Guleng; Celimuge Wu
Last, Electronics, MDPI AG, 12, 6, 1335-1335, 11 Mar. 2023, Peer-reviwed, Internet of Vehicles (IoV) is a network that connects vehicles and everything. IoV shares traffic data by connecting vehicles with the surrounding environment, which brings huge potential to people’s life. However, a large number of connections and data sharing will seriously consume vehicle resources during the interaction. In addition, how to build a safe and reliable connection to ensure vehicle safety is also an issue to consider. To solve the above problems, researchers introduce blockchains into IoV to build a safe and reliable vehicle network relying on the distributed account structure, immutable, transparent and security features of blockchains. We have investigated the application of blockchains in IoV in recent years, and have summarized and compared these studies according to their purposes. On this basis, we also point out the future trends and opportunities.
Scientific journal, English - Semantic segmentation-based semantic communication system for image transmission
Jiale Wu; Celimuge Wu; Yangfei Lin; Tsutomu Yoshinaga; Lei Zhong; Xianfu Chen; Yusheng Ji
Corresponding, Digital Communications and Networks, Elsevier BV, Feb. 2023, Peer-reviwed
Scientific journal, English - Blockchain Based Secure Outsourcing Data Integrity Auditing for Internet of Things in Cloud-edge Environment
Yangfei Lin; Celimuge Wu; Yusheng Ji; Jie Li; Zhi Liu
The 18th International Conference on Mobility, Sensing and Networking (MSN 2022), 8 pages, 355-362, Dec. 2022, Peer-reviwed
International conference proceedings, English - Learning to Optimize Computation Offloading Performance in Multi-Access Wireless Networks
Lingxin Sun; Yangjie Cao; Rui Yin; Celimuge Wu; Yongdong Zhu; Xianfu Chen
ACM MobiCom 2022 Workshop on Digital Twin & Edge AI for IIoT, 6 pages, Oct. 2022, Peer-reviwed
International conference proceedings, English - Toward Collaborative Intelligence in IoV Systems: Recent Advances and Open Issues.
Sedeng Danba; Jingjing Bao; Guorong Han; Siri Guleng; Celimuge Wu
Sensors (Basel, Switzerland), 22, 18, 6995-6995, 15 Sep. 2022, Peer-reviwed, True, Internet of Vehicles (IoV) technology has been attracting great interest from both academia and industry due to its huge potential impact on improving driving experiences and enabling better transportation systems. While a large number of interesting IoV applications are expected, it is more challenging to design an efficient IoV system compared with conventional Internet of Things (IoT) applications due to the mobility of vehicles and complex road conditions. We discuss existing studies about enabling collaborative intelligence in IoV systems by focusing on collaborative communications, collaborative computing, and collaborative machine learning approaches. Based on comparison and discussion about the advantages and disadvantages of recent studies, we point out open research issues and future research directions.
Scientific journal, English - A Fuzzy Logic-Based Approach for Interface Selection in IEEE 802.11ad/IEEE 802.11ac Heterogeneous Wireless Networks
Yue Ren; Celimuge Wu; Tsutomu Yoshinaga
The 23rd Asia-Pacific Network Operations and Management Symposium (APNOMS 2022), 15 pages, Sep. 2022, Peer-reviwed
International conference proceedings, English - Joint Collaborative Big Spectrum Data Sensing and Reinforcement Learning Based Dynamic Spectrum Access for Cognitive Internet of Vehicles
Xin Liu; Can Sun; Kok-Lim Alvin Yau; Celimuge Wu
IEEE Transactions on Intelligent Transportation Systems, XXX, XXX, XXX-815, May 2022, Peer-reviwed
Scientific journal, English - Toward Efficient Blockchain for the Internet of Vehicles with Hierarchical Blockchain Resource Scheduling
Liming Gao; Celimuge Wu; Zhaoyang Du; Tsutomu Yoshinaga; Lei Zhong; Fuqiang Liu; Yusheng Ji
Electronics, 11, 5: 832, 21 pages, Mar. 2022, Peer-reviwed
Scientific journal, English - Information Freshness-Aware Task Offloading in Air-Ground Integrated Edge Computing Systems.
Xianfu Chen; Celimuge Wu; Tao Chen 0011; Zhi Liu 0002; Honggang Zhang 0001; Mehdi Bennis; Hang Liu 0003; Yusheng Ji
IEEE Journal of Selected Areas in Communications, 40, 1, 243-258, Jan. 2022, Peer-reviwed
Scientific journal, English - Applications of Multi-agent Deep Reinforcement Learning: Models and Algorithms
Abdikarim Mohamed Ibrahim; Kok-Lim Alvin Yau; Yung-Wey Chong; Celimuge Wu
Applied Sciences, no. 22: 10870, Nov. 2021, Peer-reviwed
Scientific journal, English - Point Cloud Video Streaming in 5G Systems and Beyond: Solutions and Challenges
Zhi Liu; Qiyue Li; Xianfu Chen; Celimuge Wu; Susumu Ishihara; Jie Li; Yusheng Ji
IEEE Network, 35, 5, 202-209, Sep. 2021, Peer-reviwed
Scientific journal, English - Edge Computing-Based Joint Client Selection and Networking Scheme for Federated Learning in Vehicular IoT
Wugedele Bao; Celimuge Wu; Siri Guleng; Jiefang Zhang; Kok-Lim Alvin Yau; Yusheng Ji
China Communications, 18, 6, 39-52, Jun. 2021, Peer-reviwed
Scientific journal, English - Integrating autonomous decentralized communication and edge computing for real-time control in IoT system
Masaya Harada; Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao; Yusheng Ji
The 7th Euro-China Conference on Intelligent Data Analysis and Applications (ECC-2021), 9 pages, May 2021, Peer-reviwed
International conference proceedings, English - A Brief Review of Multipath TCP for Vehicular Networks.
Luomeng Chao; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao; Yusheng Ji
Sensors (Basel, Switzerland), 21, 8, 2793-2793, 15 Apr. 2021, Peer-reviwed, True, Multipath TCP (MPTCP) is one of the most important extensions to TCP that enables the use of multiple paths in data transmissions for a TCP connection. In MPTCP, the end hosts transmit data across a number of TCP subflows simultaneously on one connection. MPTCP can sufficiently utilize the bandwidth resources to improve the transmission efficiency while providing TCP fairness to other TCP connections. Meanwhile, it also offers resilience due to multipath data transfers. MPTCP attracts tremendous attention from the academic and industry field due to the explosive data growth in recent times and limited network bandwidth for each single available communication interface. The vehicular Internet-of-Things systems, such as cooperative autonomous driving, require reliable high speed data transmission and robustness. MPTCP could be a promising approach to solve these challenges. In this paper, we first conduct a brief survey of existing MPTCP studies and give a brief overview to multipath routing. Then we discuss the significance technical challenges in applying MPTCP for vehicular networks and point out future research directions.
Scientific journal, English - An Experimental Study on D2D Route Selection Mechanism in 5G Scenarios
Mohammad Kazem Chamran; Yau Kok-Lim Alvin; Rafidah MD Noor; Celimuge Wu
Electronics, 10, 4, article no. 387, 23 pages, Feb. 2021, Peer-reviwed
Scientific journal, English - Quantitative Study on the Impact of Energy Consumption Based Dynamic Selfishness in MANETs.
Axida Shan; Xiumei Fan; Celimuge Wu; Xinghui Zhang; Shujia Fan
Sensors (Basel, Switzerland), 21, 3, 716-716, 21 Jan. 2021, Peer-reviwed, True, Cooperative communication and resource limitation are two main characteristics of mobile ad hoc networks (MANETs). On one hand, communication among the nodes in MANETs highly depends on the cooperation among nodes because of the limited transmission range of the nodes, and multi-hop communications are needed in most cases. On the other hand, every node in MANETs has stringent resource constraints on computations, communications, memory, and energy. These two characteristics lead to the existence of selfish nodes in MANETs, which affects the network performance in various aspects. In this paper, we quantitatively investigate the impacts of node selfishness caused by energy depletion in MANETs in terms of packet loss rate, round-trip delay, and throughput. We conducted extensive measurements on a proper simulation platform incorporating an OMNeT++ and INET Framework. Our experimental results quantitatively indicate the impact of node selfishness on the network performance in MANETs. The results also imply that it is important to evaluate the impact of node selfishness by jointly considering selfish nodes' mobility models, densities, proportions, and combinations.
Scientific journal, English - Resource Management for Blockchain-enabled Internet of Vehicles.
Liming Gao; Chunrong Peng; Qitu Hu; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao; Siri Guleng
International Conference on Information and Communication Technologies for Disaster Management(ICT-DM), IEEE, 164-170, 2021
International conference proceedings - Guest Editorial: Introduction to the Special Section on Intelligence-Empowered Collaboration Among Space, Air, Ground, and Sea Mobile Networks Towards B5G.
Liang Zhao 0004; Neeraj Kumar 0001; Celimuge Wu; Jia Hu 0001; Ahmed Al-Dubai 0001
IEEE Transactions on Network Science and Engineering, 8, 4, 2719-2721, 2021
Scientific journal - UAV-empowered Vehicular Networking Scheme for Federated Learning in Delay Tolerant Environments.
Zhaoyang Du; Ganggui Wang; Narisu Cha; Celimuge Wu; Tsutomu Yoshinaga; Rui Yin
24th IEEE International Conference on Computational Science and Engineering(CSE), IEEE, 8 pages, 72-79, Oct. 2021, Peer-reviwed
International conference proceedings, English - A Distributed Computation Offloading Strategy for Edge Computing Based on Deep Reinforcement Learning.
Hongyang Lai; Zhuocheng Yang; Jinhao Li; Celimuge Wu; Wugedele Bao
Mobile Networks and Management - 11th EAI International Conference(MONAMI), Springer, 14 pages, 73-86, Oct. 2021, Peer-reviwed
International conference proceedings, English - A Fuzzy Logic Controller for Greenhouse Temperature Regulation System Based on Edge Computing.
Yue Ren; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao
Mobile Networks and Management - 11th EAI International Conference(MONAMI), Springer, 18 pages, 316-332, Oct. 2021, Peer-reviwed
International conference proceedings, English - Unlicensed Assisted Ultra-Reliable and Low-Latency Transmission.
Qiqi Xiao; Jiantao Yuan; Rui Yin; Wei Qi; Celimuge Wu; Xianfu Chen
Mobile Networks and Management - 11th EAI International Conference(MONAMI), Springer, 14 pages, 138-151, Oct. 2021, Peer-reviwed
International conference proceedings, English - Distributed Resource Management for Licensed and Unlicensed Integrated Mobile Edge Computing.
Xiao Lu; Rui Yin; Chao Chen 0005; Xianfu Chen; Celimuge Wu
IEEE Global Communications Conference(GLOBECOM), IEEE, 6 pages, 1-6, Dec. 2021, Peer-reviwed
International conference proceedings, English - Deep Reinforcement Learning Based Mode Selection for Coexistence of D2D-U and Wi-Fi.
Ganggui Wang; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao; Rui Yin
International Conference on Information and Communication Technologies for Disaster Management(ICT-DM), IEEE, 6 pages, 9-14, Dec. 2021, Peer-reviwed
International conference proceedings, English - Resource Management in MEC based Muti-Robot Cooperation Systems.
Yineng Shen; Rui Yin; Huawei Zhu; Xianfu Chen; Celimuge Wu
International Conference on Information and Communication Technologies for Disaster Management(ICT-DM), IEEE, 7 pages, 30-37, Dec. 2021, Peer-reviwed
International conference proceedings, English - A Reinforcement Learning based Edge Cloud Collaboration.
Hiroki Kobari; Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Wugedele Bao
International Conference on Information and Communication Technologies for Disaster Management(ICT-DM), IEEE, 4 pages, 26-29, Dec. 2021, Peer-reviwed
International conference proceedings, English - Communication resource allocation in platooning management based on C-V2X with spectrum sensing.
Wei Gao; Celimuge Wu; Baozhu Li; Siri Guleng
International Conference on Information and Communication Technologies for Disaster Management(ICT-DM), IEEE, 5 pages, 15-21, Dec. 2021, Peer-reviwed
International conference proceedings, English - Augmented Intelligence: Surveys of Literature and Expert Opinion to Understand Relations Between Human Intelligence and Artificial Intelligence.
Kok-Lim Alvin Yau; HeeJeong Jasmine Lee; Yung-Wey Chong; Mee Hong Ling; Aqeel Raza Syed; Celimuge Wu; Hock Guan Goh
IEEE Access, 9, 136744-136761, Sep. 2021, Peer-reviwed
Scientific journal, English - IEEE Access Special Section Editorial: Collaborative Intelligence for Internet of Vehicles
Celimuge Wu; Soufiene Djahel; Damla Turgut; Sidi-Mohammed Senouci; Lei Zhong
IEEE Access, xxx, xxx, xxx-xxx, 2021, Peer-reviwed
Scientific journal, English - Coexistence Analysis of D2D-Unlicensed and Wi-Fi Communications.
Ganggui Wang; Celimuge Wu; Tsutomu Yoshinaga; Rui Yin; Tutomu Murase; Kok-Lim Alvin Yau; Wugedele Bao; Yusheng Ji
Wireless Communications and Mobile Computing, 2021, 5523273-11, Mar. 2021, Peer-reviwed
Scientific journal, English - Reinforcement Learning-Based Multislot Double-Threshold Spectrum Sensing With Bayesian Fusion for Industrial Big Spectrum Data.
Xin Liu 0009; Can Sun; Mu Zhou; Celimuge Wu; Bao Peng; Panpan Li
IEEE Transactions on Industrial Informatics, 17, 5, 3391-3400, May 2021, Peer-reviwed
Scientific journal, English - Impact of Mode Selection on the Performance of D2D-Unlicensed Communications
Ganggui Wang; Celimuge Wu; Yoshinaga Tsutomu; Rui Yin
The 16th International Conference on Mobility, Sensing and Networking (MSN 2020), 2 pages, Dec. 2020, Peer-reviwed
International conference proceedings, English - UAV-empowered Protocol for Information Sharing in VDTN
Zhaoyang Du; Celimuge Wu; Yoshinaga Tsutomu
The 16th International Conference on Mobility, Sensing and Networking (MSN 2020), 2 pages, Dec. 2020, Peer-reviwed
International conference proceedings, English - Collaborative Intelligence for Internet of Vehicles
Celimuge Wu
International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC), Invited speech, Dec. 2020
International conference proceedings, English - Deep Reinforcement Learning based Access Control for Disaster Response Networks
Hang Zhou; Xiaoyan Wang; Masahiro Umehira; Xianfu Chen; Celimuge Wu; Yusheng Ji
IEEE GLOBECOM, 6 pages, Dec. 2020, Peer-reviwed
International conference proceedings, English - Collaborative Learning of Communication Routes in Edge-enabled Multi-access Vehicular Environment
Celimuge Wu; Zhi Liu; Fuqiang Liu; Tsutomu Yoshinaga; Yusheng Ji; Jie Li
IEEE Transactions on Cognitive Communications and Networking, 6, 4, 1155-1165, Dec. 2020, Peer-reviwed
Scientific journal, English - Empowering Blockchain in Vehicular Environments With Decentralized Edges
Su Buda; Celimuge Wu; Wugedele Bao; Siri Guleng; Jiefang Zhang; Kok-Lim Alvin Yau; Yusheng Ji
IEEE Access, 8, 202032-202041, 06 Nov. 2020, Peer-reviwed
Scientific journal, English - A Peak-Avoidance Scheme for Chasing Playback of Mobile Live Streaming
Hiroki Okada; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
11th International Workshop on Advances in Networking and Computing (CANDAR 2020 Workshop), 3 pages, Nov. 2020, Peer-reviwed
International conference proceedings, English - Spectra Efficient Space Time Coding
Rui Yin; Zhiqun Zou; Celimuge Wu; Hongjun Xu; Chao Chen
10th EAI International Conference on Mobile Networks and Management, 12 pages, Nov. 2020, Peer-reviwed
International conference proceedings, English - Virtual Edge: Collaborative Computation Offloading in VANETs
Narisu Cha; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
10th EAI International Conference on Mobile Networks and Management, 14 pages, Nov. 2020, Peer-reviwed
International conference proceedings, English - Deep Reinforcement Learning for Traffic Signal Control: A Review
Faizan Rasheed; Kok-Lim Alvin Yau; Rafidah Md Noor; Celimuge Wu; Yeh-Ching Low
IEEE Access, 8, 208016-208044, 27 Oct. 2020, Peer-reviwed
Scientific journal, English - Heterogeneity-aware Energy Saving and Energy Efficiency Optimization in Dense Small Cell Networks
Shie Wu; Rui yin; Celimuge Wu
IEEE Access, 8, 178670-178684, Oct. 2020, Peer-reviwed
Scientific journal, English - Big-Data-Based Intelligent Spectrum Sensing for Heterogeneous Spectrum Communications in 5G
Xin Liu; Qingquan Sun; Weidang Lu; Celimuge Wu; Hua Ding
IEEE Wireless Communications, 27, 5, 67-73, Oct. 2020, Peer-reviwed
Scientific journal, English - Context-Aware Clustering for SDN Enabled Network
Ran Duo; Celimuge Wu; Yoshinaga Tsutomu; Yusheng Ji
IEEE ICNP Workshop on Riding with AI towards Mission-Critical Communications and Computing at the Edge, 6 pages, Oct. 2020, Peer-reviwed
International conference proceedings, English - Blockchain for Vehicular Internet of Things: Recent Advances and Open Issues.
Chunrong Peng; Celimuge Wu; Liming Gao; Jiefang Zhang; Kok-Lim Alvin Yau; Yusheng Ji
Sensors (Basel, Switzerland), 20, 18, 1-37, 07 Sep. 2020, Peer-reviwed, True, The vehicular Internet of Things (IoT) comprises enabling technologies for a large number of important applications including collaborative autonomous driving and advanced transportation systems. Due to the mobility of vehicles, strict application requirements, and limited communication resources, the conventional centralized control fails to provide sufficient quality of service for connected vehicles, so a decentralized approach is required in the vicinity to satisfy the requirements of delay-sensitive and mission-critical applications. A decentralized system is also more resistant to the single point of failure problem and malicious attacks. Blockchain technology has been attracting great interest due to its capability of achieving a decentralized, transparent, and tamper-resistant system. There are many studies focusing on the use of blockchain in managing data and transactions in vehicular environments. However, the application of blockchain in vehicular environments also faces some technical challenges. In this paper, we first explain the fundamentals of blockchain and vehicular IoT. Then, we conduct a literature review on the existing research efforts of the blockchain for vehicular IoT by discussing the research problems and technical issues. After that, we point out some future research issues considering the characteristics of both blockchain and vehicular IoT.
Scientific journal, English - A Secure Communication System in Self-Organizing Networks via Lightweight Group Key Generation
Sirui Peng; Biao Han; Celimuge Wu; Bao-sheng Wang
IEEE Open Journal of the Computer Society, 1, 121-130, Sep. 2020, Peer-reviwed
Scientific journal, English - Vehicle Speed Prediction with Convolutional Neural Networks for ITS
Yifei Li; Celimuge Wu; Tsutomu Yoshinaga
IEEE/CIC ICCC Workshops, 6 pages, Aug. 2020, Peer-reviwed
International conference proceedings, English - An Oblivious Game-Theoretic Perspective of RRM in Vehicular Communications
Xianfu Chen; Celimuge Wu
IEEE/CIC ICCC, 5 pages, Aug. 2020, Peer-reviwed
International conference proceedings, English - Frequent Itemset Mining of User's Multi-attribute Under Local Differential Privacy
Haijiang Liu; Lianwei Cui; Xuebin Ma; Celimuge Wu
Computers, Materials & Continua, 65, 1, 369-385, Jul. 2020, Peer-reviwed
Scientific journal, English - Fuzzy Logic-Based Adaptive Point Cloud Video Streaming
Zhi Liu,Jie Li; Xianfu Chen; Celimuge Wu; Susumu Ishihara; Yusheng Ji; Jie Li
IEEE Open Journal of the Computer Society, 1, 121-130, Jul. 2020, Peer-reviwed
Scientific journal, English - A Recommendation Approach Based on Bayesian Networks for Clone Refactor
Ye Zhai; Dongsheng Liu; Celimuge Wu; Rongrong She
Computers, Materials & Continua, 64, 3, 1999-2012, Jun. 2020, Peer-reviwed
Scientific journal, English - Federated Learning for Vehicular Internet of Things: Recent Advances and Open Issues
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Kok-Lim Alvin Yau; Yusheng Ji; Jie Li
IEEE Open Journal of the Computer Society, 1, 45-61, May 2020, Peer-reviwed
Scientific journal, English - Age of Information-Aware Radio Resource Management in Vehicular Networks: A Proactive Deep Reinforcement Learning Perspective
Xianfu Chen; Celimuge Wu; Tao Chen; Honggang Zhang; Zhi Liu; Yan Zhang; Mehdi Bennis
IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers (IEEE), 19, 4, 2268-2281, Apr. 2020, Peer-reviwed
Scientific journal, English - Collaborative Vehicular Edge Computing towards Greener ITS
Su Buda; Siri Guleng; Celimuge Wu; Jiefang Zhang; Kok-Lim Alvin Yau; Yusheng Ji
IEEE Access, 8, 63935-63944, Apr. 2020, Peer-reviwed
Scientific journal, English - Extended motion diffusion based change detection for airport ground surveillance
Xiang Zhang; Ce Zhu; Honggang Wu; Min Wu; Celimuge Wu
IEEE Transactions on Image Processing, 29, 5677-5686, Apr. 2020, Peer-reviwed
Scientific journal, English - Rate satisfaction-based power allocation for NOMA-based cognitive Internet of Things
Xin Liu; Hua Ding; Xueyan Zhang; Panpan Li; Celimuge Wu
Ad Hoc Networks, 98, 1, 1-8, Mar. 2020, Peer-reviwed
Scientific journal, English - Adaptive Channel Estimation and Tracking for URA based Massive MIMO Systems
Rui Yin; Xin Zhou; Anding Wang; Caijun Zhong; Celimuge Wu; Xiaoming Chen
IEEE Access, 8, 54213-54224, Mar. 2020, Peer-reviwed
Scientific journal, English - An Efficient Privacy Preserving Spectrum Sharing
Xiaoyan Wang; Biao Han; Hao Zhou; Peng Li; Celimuge Wu
IEEE Access, 8, 34675-34685, Feb. 2020, Peer-reviwed
Scientific journal, English - SDN-based Handover Scheme in Cellular/IEEE 802.11p Hybrid Vehicular Networks
Ran Duo; Celimuge Wu; Tsutomu Yoshinaga; Jiefang Zhang; Yusheng Ji
Sensors, 20, 4, 17 pages, Feb. 2020, Peer-reviwed
Scientific journal, English - Edge-Based V2X Communications with Big Data Intelligence
Siri Guleng; Celimuge Wu; Zhi Liu; Xianfu Chen
IEEE Access, 8, 8603-8613, Jan. 2020, Peer-reviwed
Scientific journal, English - LoRa-based Physical Layer Key Generation for Secure V2V/V2I
Biao Han; Sirui Peng; Celimuge Wu; Xiaoyan Wang; Baosheng Wang
Sensors, 20, 3, 21pages, Jan. 2020, Peer-reviwed
Scientific journal, English - A VDTN scheme with enhanced buffer management
Zhaoyang Du; Celimuge Wu; Xianfu Chen; Xiaoyan Wang; Tsutomu Yoshinaga; Yusheng Ji
accepted by Wireless Networks, Springer, published online, Jan. 2020, Peer-reviwed
Scientific journal, English - Secrecy Preserving in Stochastic Resource Orchestration for Multi-Tenancy Network Slicing
Xianfu Chen; Zhifeng Zhao; Celimuge Wu; Tao Chen; Honggang Zhang; Mehdi Bennis
IEEE GLOBECOM, 6 pages, Dec. 2019, Peer-reviwed
International conference proceedings, English - Traffic Big Data Assisted V2X Communications (Invited Talk)
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, RCS2019-187, 119, 244, 51-56, Oct. 2019, Invited
English - Multi-Tenant Cross-Slice Resource Orchestration: A Deep Reinforcement Learning Approach
Xianfu Chen; Zhifeng Zhao; Celimuge Wu; Mehdi Bennis; Hang Liu; Yusheng Ji; Honggang Zhang
IEEE Journal on Selected Areas in Communications, 37, 2, 2377-2392, Oct. 2019, Peer-reviwed
Scientific journal, English - Traffic Big Data Assisted Broadcast in Vehicular Networks
Siri Guleng; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
ACM RACS, 5 pages, Sep. 2019, Peer-reviwed
International conference proceedings, English - Big Data Assisted Broadcast in VANETs
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, CQ2019-66, 49-53, Aug. 2019
English - Age of Information-Aware Multi-Tenant Resource Orchestration in Network Slicing
Xianfu Chen; Celimuge Wu; Tao Chen; Nan Wu; Honggang Zhang; Yusheng Ji
IEEE CBDCom, 7 pages, Aug. 2019, Peer-reviwed
International conference proceedings, English - Traffic Flow Prediction with Compact Neural Networks
Yuhang Li; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEEE CBDCom, 5 pages, Aug. 2019, Peer-reviwed
International conference proceedings, English - Applying SMOTE for a Sequential Classifiers Combination Method to Improve the Performance of Intrusion Detection System
Sornxayya Phetlasy; Satoshi Ohzahata; Celimuge Wu; Toshihito Kato
IEEE CyberSciTech 2019, 4 pages, Aug. 2019, Peer-reviwed
International conference proceedings, English - Deep Reinforcement Learning for D2D transmission in unlicensed bands
Zhiqun Zou; Rui Yin; Xianfu Chen; Cemulige Wu
IEEE/CIC ICCC Workshops, 6 pages, Aug. 2019, Peer-reviwed
International conference proceedings, English - Integrating Licensed and Unlicensed Spectrum in Internet-of-Vehicles with Mobile Edge Computing
Celimuge Wu; Xianfu Chen; Tsutomu Yoshinaga; Yusheng Ji; Yan Zhang
IEEE Network, 33, 4, 48-53, Aug. 2019, Peer-reviwed
Scientific journal, English - A Reliable Energy Efficient Dynamic Spectrum Sensing for Cognitive Radio IoT Networks
James Adu Ansere; Guangjie Han; Hao Wang; Chang Choi; Celimuge Wu
IEEE Internet of Things Journal, 6, 4, 6748-6759, Aug. 2019, Peer-reviwed
Scientific journal, English - Edge Computing in 5G: A Review
Najmul Hassan; Kok-Lim Alvin Yau; Celimuge Wu
IEEE Access, 7, 127276-127289, Aug. 2019, Peer-reviwed
Scientific journal, English - Empowering Vehicular Networks with Computational Intelligence
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji; Tutomu Murase
IEICE Technical Report, ICM2019-19, 77-82, Jul. 2019
English - Online Incentive Mechanism for Crowdsourced Radio Environment Map Construction
Xiaoyan Wang; Masahiro Umehira; Biao Han; Peng Li; Yu Gu; Celimuge Wu
IEEE ICC, 6 pages, May 2019, Peer-reviwed
International conference proceedings, English - Decentralized Deep Reinforcement Learning for Delay-Power Tradeoff in Vehicular Communications
Xianfu Chen; Celimuge Wu; Honggang Zhang; Yan Zhang; Mehdi Bennis; Heli Vuojala
IEEE ICC, 6 pages, May 2019, Peer-reviwed
International conference proceedings, English - A Sequential Classifiers Combination Method to Reduce False Negative for Intrusion Detection System
Sornxayya Phetlasy; Satoshi Ohzahata; Celimuge Wu; Toshihito Kato
IEICE Transactions on Information and Systems, E102-D, 5, May 2019, Peer-reviwed
Scientific journal, English - Learning to Entangle Radio Resources in Vehicular Communications: An Oblivious Game-Theoretic Perspective
Xianfu Chen; Celimuge Wu; Mehdi Bennis; Zhifeng Zhao; Zhu Han
IEEE Transactions on Vehicular Technology, 68, 5, 4262-4274, May 2019, Peer-reviwed
Scientific journal, English - MEGEE: Mobile Edge computer Geared v2x for E-mobility Ecosystem
Yue Cao; Celimuge Wu; Xu Zhang; William Liu; Linyu Peng; Muhammad Khalid
IEEE WCNC, 6 pages, Apr. 2019, Peer-reviwed, The introduction of Electric Vehicles (EVs) leads to new concern on the E-Mobility. Making charging reservation, by considering the EV's arrival time and its expected charging time at Charging Stations (CSs) has been studied to predict the dynamic status of CSs. In this paper, we propose a Mobile Edge computer Geared v2x for E-mobility Ecosystem (MEGEE), as a decentralized alternative to the conventional centralized cloud based architecture. MEGEE enables the Vehicular Delay/Disruption Tolerant Networking (VDTN)-driven anycasting for information delivery, and Mobile Edge Computing (MEC) functioned CSs for information mining and aggregation. MEGEE efficiently and timely processes essential charging reservations and charging control information, through the Internet of EVs and MEC servers. Our studies show that MEGEE can achieve the close charging performance as performed by the centralized system, while offers a significant saving in communications cost.
International conference proceedings, English - Maritime Networking: Bringing Internet to the Sea
Kok-Lim Alvin Yau; Aqeel Raza Syed; Wahidah Hashim; Junaid Qadir; Celimuge Wu; Najmul Hassan
IEEE Access, 7, 48236-48255, Apr. 2019, Peer-reviwed
Scientific journal, English - Mobile Edge Computing for Internet of Vehicles: Offloading Framework and Job Scheduling
Jingyun Feng; Zhi Liu; Celimuge Wu; Yusheng Ji
IEEE Vehicular Technology Magazine, 14, 1, 28-36, Mar. 2019, Peer-reviwed
Scientific journal, English - Decentralized Trust Evaluation in Vehicular Internet of Things
Siri Guleng; Celimuge Wu; Xianfu Chen; Xiaoyan Wang; Tsutomu Yoshinaga; Yusheng Ji
IEEE Access, 7, 15980-15988, Feb. 2019, Peer-reviwed
Scientific journal, English - A near-optimal data structure for approximate range emptiness problem in Information-Centric Internet of Thing
Xiujun Wang; Zhi Liu; Yan Gao; Xiao Zheng; Xianfu Chen; Celimuge Wu
IEEE Access, 7, 21857-21869, Feb. 2019, Peer-reviwed
Scientific journal, English - A Vehicular DTN Routing Protocol with Enhanced Buffer Management Policy
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, CQ2018-81, 118, 395, 29-34, Jan. 2019
English - Enhancing DASH Video QoE Over High-speed Train Using Segment-based Prefetching and Caching
Yue Cao; Ning Wang; Celimuge Wu; Xu Zhang; Chakkaphong Suthaputchakun
IEEE MultiMedia, Accepted, 2019, Peer-reviwed
Scientific journal, English - Traffic Big Data Assisted V2X Communications toward Smart Transportation
Chang An; Celimuge Wu
Wireless Networks, Accepted, 2019, Peer-reviwed
Scientific journal, English - Optimized Computation Offloading Performance in Virtual Edge Computing Systems via Deep Reinforcement Learning
Xianfu Chen; Honggang Zhang; Celimuge Wu; Shiwen Mao; Yusheng Ji; Mehdi Bennis
IEEE Internet of Things Journal, 67, 12, 12038-12048, Dec. 2018, Peer-reviwed
Scientific journal, English - Computational Intelligence Inspired Data Delivery for Vehicle-to-roadside Communications
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji; Yan Zhang
IEEE Transactions on Vehicular Technology, 67, 12, 12038-12048, Dec. 2018, Peer-reviwed
Scientific journal, English - Multi-agent Trust Evaluation in Vehicular Internet of Things
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
The 5th International Workshop on Smart Wireless Communications, Poster, 30 Oct. 2018
International conference proceedings, English - SDN-based Handover Approach in IEEE 802.11p and LTE hybrid vehicular networks
Ran Duo; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
The IEEE International Conference on Cloud and Big Data Computing (CBDCom 2018), 6 pages, Oct. 2018, Peer-reviwed
International conference proceedings, English - A Prophet-based DTN protocol for VANETs
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
The IEEE International Conference on Cloud and Big Data Computing (CBDCom 2018), 4 pages, Oct. 2018, Peer-reviwed
International conference proceedings, English - Spatial Intelligence towards Trustworthy Vehicular IoT
Celimuge Wu; Zhi Liu; Di Zhang; Tsutomu Yoshinaga; Yusheng Ji
IEEE Communications Magazine, 56, 10, 22-27, Oct. 2018, Peer-reviwed
Scientific journal, English - Performance Optimization in Mobile-Edge Computing via Deep Reinforcement Learning
Xianfu Chen; Honggang Zhang; Celimuge Wu; Shiwen Mao; Yusheng Ji
IEEE VTC2018-Fall, 6 pages, Aug. 2018, Peer-reviwed
International conference proceedings, English - Feature Based Modulation Classification for Overlapped Signals
Yizhou Jiang; Sai Huang; Yixin Zhang; Zhiyong Feng; Di Zhang; Celimuge Wu
IEICE Trans. on Fundamentals, E101-A, 7, 1123-1126, Jul. 2018, Peer-reviwed
Scientific journal, English - Cognition-inspired 5G cellular networks: a review and the road ahead
Kok-Lim Alvin Yau; Junaid Qadir; Celimuge Wu; Muhammad; Ali Imran; Mee Hong Ling
IEEE Access, 6, 35072-35090, Jul. 2018, Peer-reviwed
Scientific journal, English - Performance evaluation of RPL-based sensor data collection in challenging IoT environment
Liming Gao; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
The 2nd International Conference on Healthcare Science and Engineering (Healthcare’2018), 6 pages, 01 Jun. 2018, Peer-reviwed
International conference proceedings, English - Computational Intelligence in Wireless IoT
Celimuge Wu
The 2nd International Conference on Healthcare Science and Engineering (Healthcare’2018), Keynote, 01 Jun. 2018, Peer-reviwed, Invited
International conference proceedings, English - A Context-aware Edge-based VANET Communication Scheme for ITS
Chang An; Celimuge Wu; Tsutomu Yoshinaga; Xianfu Chen; Yusheng Ji
Sensors, 18, 7, Jun. 2018, Peer-reviwed
Scientific journal, English - Computational Intelligence for Vehicular Internet of Things (Invited Talk)
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, SR2018-10, 118, 57, 57-62, May 2018, Invited
English - Multipath Transmission Scheduling in Millimeter Wave Cloud Radio Access Networks
Xianfu Chen; Pei Liu; Hang Liu; Celimuge Wu; Yusheng Ji
in Proceedings of IEEE ICC 2018, May 2018, Peer-reviwed
International conference proceedings, English - Learning for Adaptive Anycast in Vehicular Delay Tolerant Networks
Celimuge Wu; Tsutomu Yoshinaga; Dabhur Bayar; Yusheng Ji
Journal of Ambient Intelligence and Humanized Computing, 2018, May 2018, Peer-reviwed
Scientific journal, English - モバイルエッジコンピューティングにおけるQoS最適VM移動制御
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Tutomu Murase
IEICE Technical Report, IN2017-98, 51-56, Mar. 2018
Japanese - Cluster-Based Content Distribution Integrating LTE and IEEE 802.11p with Fuzzy Logic and Q-Learning
Celimuge Wu; Tsutomu Yoshinaga; Xianfu Chen; Lin Zhang; Yusheng Ji
IEEE Computational Intelligence Magazine, Institute of Electrical and Electronics Engineers Inc., 13, 1, 41-50, 01 Feb. 2018, Peer-reviwed, There is an increasing demand for distributing a large amount of content to vehicles on the road. However, the cellular network is not sufficient due to its limited bandwidth in a dense vehicle environment. In recent years, vehicular ad hoc networks (VANETs) have been attracting great interests for improving communications between vehicles using infrastructure-less wireless technologies. In this paper, we discuss integrating LTE (Long Term Evolution) with IEEE 802.11p for the content distribution in VANETs. We propose a two-level clustering approach where cluster head nodes in the first level try to reduce the MAC layer contentions for vehicle-tovehicle (V2V) communications, and cluster head nodes in the second level are responsible for providing a gateway functionality between V2V and LTE. A fuzzy logic-based algorithm is employed in the first-level clustering, and a Q-learning algorithm is used in the second-level clustering to tune the number of gateway nodes. We conduct extensive simulations to evaluate the performance of the proposed protocol under various network conditions. Simulation results show that the proposed protocol can achieve 23% throughput improvement in highdensity scenarios compared to the existing approaches.
Scientific journal, English - VM migration in mobile edge computing for QoS improvement with wireless multi-hop access networks
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Tutomu Murase
ACM International Conference Proceeding Series, Association for Computing Machinery, 8 pages, 05 Jan. 2018, Peer-reviwed, Quality of Service (QoS) applications running in an edge node of mobile edge computing (MEC) could degrade due to congestion of wireless access or shortage of mobile edge computing resources. To improve QoS, such as TCP throughput, we propose a virtual machine (VM) migration method, which takes a VM from a congested node to another node in a mobile edge. We also propose an approach in which a wireless LAN access point (AP) is employed as an edge of the MEC to obtain high throughput in the VM migration method. More specifically, a VM is migrated to an edge node either at a cellular base station (BS) site or at a wireless LAN AP site depending on the estimated throughput. When the physical distance between a user device and a new edge node is large, a multi-hop ad hoc network is utilized between them. In this case, throughput is affected by background traffic yielded by relay devices. Evaluation models that have a number of TCP connections as background traffic will be used to investigate the throughput before and after the VM migration. Users can choose whether to continue communications with a near but congested node or to conduct a VM migration to a far but less congested node. The evaluation results show that a VM migration to an edge server at a BS site could improve TCP throughput by more than 60%, even when the relay devices emit a few TCP connections. Moreover, a VM migration to an AP site can improve TCP throughput by more than 80%, even when the relay devices emit 2 TCP connections.
International conference proceedings, English - An Openflow-based Management Framework for Sensor and Actuator Networks
Rui Kang; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, CQ2017-87, 11-17, Jan. 2018
English - A Learning-based Probabilistic Routing Protocol for Vehicular Delay Tolerant Networks
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
4th International Conference on Information and Communication Technologies for Disaster Management (ICT-DM2017), 6 pages, 11 Dec. 2017, Peer-reviwed
International conference proceedings, English - Vehicular multi-access edge computing with licensed sub-6 GHz, IEEE 802.11p and mmWave
Qitu Hu; Celimuge Wu; Xiaobing Zhao; Xianfu Chen; Yusheng Ji; Tsutomu Yoshinaga
IEEE Access, Institute of Electrical and Electronics Engineers Inc., 6, 1995-2004, 07 Dec. 2017, Peer-reviwed, With the rapid increase of vehicular Internet of things applications, it is urgent to design a mobile edge computing architecture, which is possible to distribute and process a large amount of contents with vehicles on the road. From a communication perspective, the current cellular technology faces challenges due to the limited bandwidth in a dense vehicle environment. In this paper, we propose a multi-access edge computing framework and the corresponding communication protocol which integrates licensed Sub-6 GHz band, IEEE 802.11p, and millimeter wave (mmWave) communications for the content distribution and processing in vehicular networks. The proposed protocol uses a cluster-based approach, where a fuzzy logic-based algorithm is employed to select efficient gateway nodes which bridge the licensed Sub-6 GHz communication and the mmWave communication in order to maximize the overall network throughput. IEEE 802.11p vehicle-to-vehicle communication is used to share information among vehicles in order to achieve efficient clustering. We conduct extensive simulations to evaluate the performance of the proposed protocol under various network conditions. Simulation results show that the proposed protocol can achieve significant improvements in various scenarios compared with the existing approaches.
Scientific journal, English - Cooperative Content Delivery in Vehicular Networks with Integration of Sub-6 GHz and mmWave
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEEE Global Communications Conference Workshops, 6 pages, 04 Dec. 2017, Peer-reviwed
International conference proceedings, English - An Oblivious Game-Theoretic Approach for Wireless Scheduling in V2V Communications
Xianfu Chen; Celimuge Wu; Mehdi Bennis
IEEE Global Communications Conference, 6 pages, 04 Dec. 2017, Peer-reviwed
International conference proceedings, English - Cooperative Content Delivery in Vehicular Networks with Integration of Sub-6 GHz and mmWave
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEEE GLOBECOM Workshop on 5G Networks Using Unlicensed Spectrum, 6 pages, 04 Dec. 2017, Peer-reviwed
International conference proceedings, English - Color-Based Cooperative Cache and Its Routing Scheme for Telco-CDNs
Takuma Nakajima; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E100D, 12, 2847-2856, Dec. 2017, Peer-reviwed, Cooperative caching is a key technique to reduce rapid growing video-on-demand's traffic by aggregating multiple cache storages. Existing strategies periodically calculate a sub-optimal allocation of the content caches in the network. Although such technique could reduce the generated traffic between servers, it comes with the cost of a large computational overhead. This overhead will be the cause of preventing these caches from following the rapid change in the access pattern. In this paper, we propose a light-weight scheme for cooperative caching by grouping contents and servers with color tags. In our proposal, we associate servers and caches through a color tag, with the aim to increase the effective cache capacity by storing different contents among servers. In addition to the color tags, we propose a novel hybrid caching scheme that divides its storage area into colored LFU (Least Frequently Used) and no-color LRU (Least Recently Used) areas. The colored LFU area stores color-matching contents to increase cache hit rate and no-color LRU area follows rapid changes in access patterns by storing popular contents regardless of their tags. On the top of the proposed architecture, we also present a new routing algorithm that takes benefit of the color tags information to reduce the traffic by fetching cached contents from the nearest server. Evaluation results, using a backbone network topology, showed that our color-tag based caching scheme could achieve a performance close to the sub-optimal one obtained with a genetic algorithm calculation, with only a few seconds of computational overhead. Furthermore, the proposed hybrid caching could limit the degradation of hit rate from 13.9% in conventional non-colored LFU, to only 2.3%, which proves the capability of our scheme to follow rapid insertions of new popular contents. Finally, the color-based routing scheme could reduce the traffic by up to 31.9% when compared with the shortest-path routing.
Scientific journal, English - AVE: Autonomous Vehicular Edge Computing Framework with ACO-Based Scheduling
Jingyun Feng; Zhi Liu; Celimuge Wu; Yusheng Ji
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 66, 12, 10660-10675, Dec. 2017, Peer-reviwed, With the emergence of in-vehicle applications, providing the required computational capabilities is becoming a crucial problem. This paperproposes a framework named autonomous vehicular edge (AVE) for edge computing on the road, with the aim of increasing the computational capabilities of vehicles in a decentralized manner. By managing the idle computational resources on vehicles and using them efficiently, the proposed AVE framework can provide computation services in dynamic vehicular environments without requiring particular infrastructures to be deployed. Specifically, this paper introduces a workflow to support the autonomous organization of vehicular edges. Efficient job caching is proposed to better schedule jobs based on the information collected on neighboring vehicles, including GPS information. A scheduling algorithm based on ant colony optimization is designed to solve this job assignment problem. Extensive simulations are conducted, and the simulation results demonstrate the superiority of this approach over competing schemes in typical urban and highway scenarios.
Scientific journal, English - A Light-weight Cooperative Caching Strategy by D2D Content Sharing
Takayuki Shiroma; Takuma Nakajima; Celimuge Wu; Tsutomu Yoshinaga
The Fifth International Symposium on Computing and Networking (CANDAR), 6 pages, 19 Nov. 2017, Peer-reviwed
International conference proceedings, English - Efficient Content Delivery in Vehicular Networks with Sub-6 GHz and mmWave
Celimuge Wu; Tsutomu Yoshinaga; Tutomu Murase; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, CQ2017-74, 304, 23-28, Nov. 2017
Symposium, English - Mobile Edge Computing Based VM Migration for QoS Improvement
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Tutomu Murase
IEEE 6th Global Conference on Consumer Electronics (GCCE), 5 pages, 24 Oct. 2017, Peer-reviwed
International conference proceedings, English - V2R Communication Protocol Based on Game Theory Inspired Clustering
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEEE 86th Vehicular Technology Conference (VTC2017-Fall), 6 pages, 24 Sep. 2017, Peer-reviwed
International conference proceedings, English - Connected Vehicles and Internet of Things
Celimuge Wu
2nd International Conference on Telecommunication and Networks, Keynote, 10 Aug. 2017, Peer-reviwed, Invited
International conference proceedings, English - Enabling high performance handover in IEEE 802.11p and LTE hybrid vehicular networks with SDN and MEC
Ran Duo; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, CQ2017-53, 185, 19-23, Aug. 2017
English - Performance Evaluation of Vehicular DTN Protocols for Anycast Vehicle-to-cloud Communications
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, CQ2017-52, 185, 13-18, Aug. 2017
English - A Reinforcement Learning-Based Data Storage Scheme for Vehicular Ad Hoc Networks
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji; Tutomu Murase; Yan Zhang
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 66, 7, 6336-6348, Jul. 2017, Peer-reviwed, Vehicular ad hoc networks (VANETs) have been attracting interest for their potential roles in intelligent transport systems (ITS). In order to enable distributed ITS, there is a need to maintain some information in the vehicular networks without the support of any infrastructure such as road side units. In this paper, we propose a protocol that can store the data in VANETs by transferring data to a new carrier (vehicle) before the current data carrier is moving out of a specified region. For the next data carrier node selection, the protocol employs fuzzy logic to evaluate instant reward by taking into account multiple metrics, specifically throughput, vehicle velocity, and bandwidth efficiency. In addition, a reinforcement learning-based algorithm is used to consider the future reward of a decision. For the data collection, the protocol uses a cluster-based forwarding approach to improve the efficiency of wireless resource utilization. We use theoretical analysis and computer simulations to evaluate the proposed protocol.
Scientific journal, English - Content Distribution in VANETs Integrating LTE and IEEE 802.11p
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, CQ2017-14, 68, 1-6, May 2017
English - HVC: A Hybrid Cloud Computing Framework in Vehicular Environments
Jingyun Feng; Zhi Liu; Celimuge Wu; Yusheng Ji
5th IEEE International Conference on Mobile Cloud Computing, Services, and Engineering (Mobile Cloud 2017), 8pages, Apr. 2017, Peer-reviwed
International conference proceedings, English - Performance Evaluation on Wireless Multi-hop Networks Connected to Mobile Edge Computing
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Tutomu Murase
Technical Report of IEICE, IN2016-156, Mar. 2017
Japanese - Resolving Bufferbloat Problem at Access Point for Upload TCP Communication Over IEEE802.11n Wireless LAN
Masataka Nomoto; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
情報処理学会論文誌, IPSJ, 58, 2, 427-438, 01 Feb. 2017, Peer-reviwed, IEEE 802.11n無線アクセスポイントを経由するTCP通信では，低いMACレベルデータレートが使用される場合に，往復遅延が増加するBufferbloat問題が発生し，同じキューを共通する他の通信の遅延時間が増加し，ユーザレベルの品質の悪化となる．この対処として，アクティブキュー管理方式，筆者らが先に示した無線LANの最大再送回数を制限する方法，遅延増加時にTCP通信を停止する方法などが提案されている．しかしこれらはすべて，データの送信側に実装する必要がある．このため，端末からアクセスポイントへのアップロード転送においては，端末のすべてにこのような方式を導入しなければならない．そこで本稿では，データの受信側であるアクセスポイントにおいて，低いMACレベルデータレートで無線LANフレームの最大再送回数を制限したと同様な効果を与えることにより，TCPの輻輳ウィンドウを減少させ，Bufferbloat問題に対応する方法を提案する．パソコンを用いたアクセスポイントに提案方式を実装することにより，Bufferbloat問題に対応していない端末で，低いMACレベルデータレートでの往復遅延を減少させられること，さらにBufferbloat問題に対する方法を実装している端末においてもTCP通信のスループットを悪化させることがないことを明らかにした．IEEE 802.11n wireless LANs provides a Bufferbloat problem such that the round-tirp delay increases in TCP communications when the MAC level data is low such as 6.5Mbps. This problem degrades user level quality of service for communications sharing the transmission queue with the TCP communications. In order to resolve this problem, several schemes are proposed such as a scheme based on active queue management, our previous scheme reducing the retry-out limit at low data rate, and a scheme stopping sending TCP level data when the queue contains more than a specific number of packes. However, those schemes need to be implemented at the sender side. In this paper, we propose a new scheme resolving a Bufferbloat problem in the upload TCP communications by providing an effect at a receiving side access point similar to reducing the retry-out limit when the MAC level data rate is low. This decreases the congestion window size in the sending side and can reduce the delay. This paper also shows the results of the performance evaluation by implementing the proposed method in a PC based access point. According to the results, the proposed method decreases the round-trip time in the low MAC data rate and does not reduce the TCP throughput. It does not give any influences on the TCP thoughput for the terminals supporting the conventional schemes for Bufferbroat problems.
Scientific journal, Japanese - Resolving Bufferbloat in TCP Communication over IEEE 802.11n WLAN by Reducing MAC Retransmission Limit at Low Data Rate
Masataka Nomoto; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Proc. ICN 2017, 69-74, 2017, Peer-reviwed
International conference proceedings, English - A Solution for Bufferbloat Problem in Upload TCP Communication over IEEE 802.11n WLAN Only by Modifying Access Point
Masataka Nomoto; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
The Sixth International Conference on Communications, Computation, Networks and Technologies (INNOV 2017), 8-13, 2017, Peer-reviwed
International conference proceedings, English - DTN-based Vehicular Cloud for Post-disaster Information Sharing
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
2017 WIRELESS DAYS, IEEE, 6pages, 167-172, 2017, Peer-reviwed, We first propose a framework which utilizes vehicular delay tolerant network (DTN) to form a vehicular cloud in order to provide information exchange without communication infrastructure. The framework does not rely on cellular network and therefore provides an approach which is suitable for post-disaster communication where cellular network is unavailable or severely congested. The paper also proposes a protocol which is able to provide vehicle-to-cloud communication in frequently changing vehicular environment. The protocol takes into account the link throughput, additional signal coverage, connection time, and the probability to encounter a RSU for the forwarder selection by using a fuzzy logic-based approach. The protocol also employs a network coding approach to reduce the overhead while maintaining a high data delivery ratio. We use computer simulations to evaluate the proposed framework.
International conference proceedings, English - A TDMA/DCF Hybrid QoS Scheme for Ad Hoc Networks
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E100B, 1, 42-53, Jan. 2017, Peer-reviwed, We propose a QoS scheme for ad hoc networks by combining TDMA and IEEE 802.11 DCF, and present performance evaluation results of the scheme. In the proposed scheme, the channel time is composed of two different periods, specifically TDMA period and DCF period. The TDMA period provides contention free transmission opportunities for QoS flows, and the DCF period provides contention-based access for best effort or low priority flows. We evaluate the proposed scheme for various numbers of TCP flows and different CBR data rates with QualNet simulator. Simulation results show that the protocol is able to provide an efficient solution for QoS control in ad hoc networks.
Scientific journal, English - Multihop Data Delivery Virtualization for Green Decentralized IoT
Lifeng Zhang; Celimuge Wu; Tsutomu Yoshinaga; Xianfu Chen; Tutomu Murase; Yusheng Ji
Wireless Communications and Mobile Computing, Hindawi Limited, 2017, 9 pages, 2017, Peer-reviwed, Decentralized communication technologies (i.e., ad hoc networks) provide more opportunities for emerging wireless Internet of Things (IoT) due to the flexibility and expandability of distributed architecture. However, the performance degradation of wireless communications with the increase of the number of hops becomes the main obstacle in the development of decentralized wireless IoT systems. The main challenges come from the difficulty in designing a resource and energy efficient multihop communication protocol. Transmission control protocol (TCP), the most frequently used transport layer protocol for achieving reliable end-to-end communications, cannot achieve a satisfactory result in multihop wireless scenarios as it uses end-to-end acknowledgment which could not work well in a lossy scenario. In this paper, we propose a multihop data delivery virtualization approach which uses multiple one-hop reliable transmissions to perform multihop data transmissions. Since the proposed protocol utilizes hop-by-hop acknowledgment instead of end-to-end feedback, the congestion window size at each TCP sender node is not affected by the number of hops between the source node and the destination node. The proposed protocol can provide a significantly higher throughput and shorter transmission time as compared to the end-to-end approach. We conduct real-world experiments as well as computer simulations to show the performance gain from our proposed protocol.
Scientific journal, English - Vehicular DTN as an Approach for Post-disaster Communication
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, 116, 323, CQ2016-83, 53-58, Nov. 2016
English - Combining two sequential algorithms for classification of intrusion detection system dataset
Phetlasy Sornxayya; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
The 11th International Workshop on Security, poster, Sep. 2016, Peer-reviwed
International conference proceedings, English - A context-aware unified routing protocol for vehicular ad hoc networks
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
IEICE Technical Report, 電子情報通信学会, 116, 202, CQ2016-64, 87-92, Aug. 2016
English - Performance Anomaly in Download TCP Flows Over IEEE 802.11n Wireless LAN
Yoshiki Hashimoto; Masataka Nomoto; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
The Fifth International Conference on Communications, Computation, Networks and Technologies, 13-18, Aug. 2016, Peer-reviwed
International conference proceedings, English - A Cooperative Forwarding Scheme for VANET Routing Protocols
Celimuge Wu; Yusheng Ji; Tsutomu Yoshinaga
ZTE Communications, 14, 3, 13-21, Aug. 2016, Peer-reviwed
Scientific journal, English - IBGP Solution by Combining Route Reflection And Shared Tree Based Multicast
Toshihiko Kato; Yao Koffi; Hubert Wilfried; Celimuge Wu; Satoshi Ohzahata
5th International Conference on Theory and Practice in Modern Computing, 203-210, Jul. 2016, Peer-reviwed
International conference proceedings, English - Reinforcement Learning-based Data Storage Scheme in Vehicular Ad Hoc Networks
Celimuge Wu; Tsutomu Yoshinaga; Tutomu Murase; Yan Zhang
IEEE International Conference on Communications (ICC), 6 pages, May 2016, Peer-reviwed
International conference proceedings, Japanese - Experimental Analysis on Performance Anomaly for Download Data Transfer at IEEE 802.11n Wireless LAN
Yoshiki Hashimoto; Masataka Nomoto; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
ICN 2016, 22-27, Feb. 2016, Peer-reviwed
International conference proceedings, English - How to Utilize Inter-flow Network Coding in VANETs: A Backbone Based Approach
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEEE Transactions on Intelligent Transportation Systems, IEEE, 17, 8, 2223-2237, Feb. 2016, Peer-reviwed
Scientific journal, English - Resource Allocation and Layer Selection for Video Streaming over Highway Networks Using Scalable Video Coding
Ruijian An; Zhi Liu; Hao Zhou; Celimuge Wu; Yusheng Ji
IEICE Technical Report, 115, 408,CQ2015-104, 67-72, Jan. 2016
English - Reinforcement learning-based parameter tuning for a broadcast protocol in VANETs
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Tsutomu Yoshinaga; Yoshihiko Kato
IEICE Technical Report, 115, 408,CQ2015-105, 73-78, Jan. 2016
English - Improving the Tor Traffic Distribution with Circuit Switching Method
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
2016 IEEE 17TH INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE SWITCHING AND ROUTING (HPSR), IEEE, 2 pages, 106-107, 2016, Peer-reviwed, The Tor network has its user grown by thousands every year. The increasing number of users around the world makes Tor become one of the widely used privacy networks today. However, as the number of Tor user increases, the performance of Tor degrades badly due to traffic is not fairly distributed. As a result, the Tor network does not provide a better quality of communication for all its users. To improve these problems, we proposed a simple method of dynamic circuit switching on the Tor application level to distribute the bulk and light traffic on Tor. We calculated the fairness indexes of transferred bulk and light traffic to observe any improvement and, compared our method with the default entry onion router algorithm. Our experimental results show the proposed method improves the distribution of traffic and achieves fairness of throughputs for all Tor users.
International conference proceedings, English - Evaluating Tor Modified Switching Algorithm in the Emulation Environment
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
2016 22ND ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC), IEEE, 510-516, 2016, Peer-reviwed, The Tor network is an open network that helps its users to defend against adversaries who performed traffic analysis and threatens the personal privacy and confidential security. Tor protects its users by preventing the sites they visit from revealing their physical location. As the number of Tor user increases, the performance of Tor degrades badly due to Tor's scheduler is not fairly distributing the traffic in Tor. In this paper, we highlight the problems in Tor performance due to scheduling design of Tor, which degrades the web and bulk traffic performances that multiplexes on a single TCP connection. To solve these problems, this paper emphasis on applying a simple method of active circuit switching on Tor application level, in order to distribute the bulk and web traffics on different TCP connections when congestion is detected in the Tor network. We evaluate our modified switching algorithm with the other default schedulers in Tor, such as vanilla Tor and priority EWMA scheduler in a shadow wide deployment network emulator. The experimental results show that our switching technique considerably offers stable improvement of traffic performance for all the web and bulk traffics.
International conference proceedings, English - Context-aware Unified Routing for VANETs Based on Virtual Clustering
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
2016 IEEE 27TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATIONS (PIMRC), IEEE, 6 pages, 269-274, 2016, Peer-reviwed, We propose a context-aware routing protocol for vehicular ad hoc networks (VANETs). Two types of context information is considered in this paper specifically communication type (broadcast or unicast) and packet size. The proposed protocol constructs route based on virtual clustering which only exchanges beacon messages in one-hop neighborhood area. The packets are forwarded by the cluster heads, and the last 2-hop route is optimized by using a reinforcement learning algorithm which can attain good performance with low overhead. The advantage of the proposed protocol is shown by using computer simulations.
International conference proceedings, English - A Light-weight Content Distribution Scheme for Cooperative Caching in Telco-CDNs
Takuma Nakajima; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
2016 FOURTH INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR), IEEE, 7pages, 126-132, 2016, Peer-reviwed, A key technique to reduce the rapid growing of video-on-demand's traffic is a cooperative caching strategy aggregating multiple cache storages. Many internet service providers have considered the use of cache servers on their networks as a solution to reduce the traffic. Existing schemes often periodically calculate a sub-optimal allocation of the content caches in the network. However, such approaches require a large computational overhead that cannot be amortized in a presence of frequent changes of the contents' popularities. This paper proposes a light-weight scheme for a cooperative caching that obtains a sub-optimal distribution of the contents by focusing on their popularities. This was made possible by adding color tags to both cache servers and contents. In addition, we propose a hybrid caching strategy based on Least Frequently Used (LFU) and Least Recently Used (LRU) schemes, which efficiently manages the contents even with a frequent change in the popularity. Evaluation results showed that our light-weight scheme could considerably reduce the traffic, reaching a sub-optimal result. In addition, the performance gain is obtained with a computation overhead of just a few seconds. The evaluation results also showed that the hybrid caching strategy could follow the rapid variation of the popularity. While a single LFU strategy drops the hit ratio by 13.9%, affected by rapid popularity changes, our proposed hybrid strategy could limit the degradation to only 2.3%.
International conference proceedings, English - Accelerating BLAST Computation on an FPGA-enhanced PC Cluster
Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
2016 FOURTH INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR), IEEE, 7pages, 67-76, 2016, Peer-reviwed, This paper introduces an FPGA-based scheme to accelerate mpiBLAST, which is a parallel sequence alignment algorithm for computational biology. Recent rapidly growing biological databases for sequence alignment require high-throughput storage and network rather than computing speed. Our scheme utilizes a specialized hardware configured on an FPGA-board which connects flash storage and other FPGA-boards directly. The specialized hardware configured on the FPGAs, we call a Data Stream Processing Engine (DSPE), take a role for preprocessing to adjust data for high-performance multi-and many-core processors simultaneously with offloading system-calls for storage access and networking. DSPE along the datapath achieves in-datapath computing which applies operations for data streams passing through the FPGA. Two functions in mpiBLAST are implemented using DSPE to offload operations along the datapath. The first function is database partitioning, which distributes the biological database to multiple computing nodes before commencing the BLAST processes. Using DSPE, we observe a 20-fold improvement in computation time for the database partitioning operation. The second function is an early part of the BLAST process that determines the positions of sequences for more detailed computations. We implement IDP-BLAST (In-datapath BLAST), which annotates positions in data streams from solid-state drives. We show that IDP-BLAST accelerates the computation time of the preprocess of BLAST by a factor of three hundred by offloading heavy operations to the introduced special hardware.
International conference proceedings, English - Upper bounds on lifetime of three-dimensional UWB sensor networks of multi-source, multi-destination
Juan Xu; Binbin Lv; Celimuge Wu; Jing Zhou
INTERNATIONAL JOURNAL OF SENSOR NETWORKS, INDERSCIENCE ENTERPRISES LTD, 20, 1, 9-15, 2016, Peer-reviwed, Three dimensional wireless sensor networks could enable a broad range of applications. We study the asymptotic upper bounds on the lifetime of three dimensional time-hopping impulse radio ultra-wideband (TH-IR UWB) sensor networks of multi-source, multi-destination, and assuming that each source node transmits own packets to its n(d) destination nodes along the respective minimum energy dissipation route. In this paper, we consider the random network of a general node density lambda is an element of [1, n], rather than only study either random dense network (lambda = n) or random extended network (lambda = 1). The results indicate that the general upper bounds on the network lifetime of multi-source, multi-destination increase with the node density lambda. The results also reveal that reducing the product of n(s) and n(d) can improve lifetime of network. Furthermore, as n(s) = n and n(d) = 1, the upper bounds on lifetime of TH-IR UWB sensor network with multi-source, multi-destination become that of multi-source, single-destination network.
Scientific journal, English - Toward Practical and Intelligent Routing in Vehicular Ad Hoc Networks
Celimuge Wu; Yusheng Ji; Fuqiang Liu; Satoshi Ohzahata; Toshihiko Kato
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 64, 12, 5503-5519, Dec. 2015, Peer-reviwed, Apart from vehicle mobility, data rate (bit rate) and multihop data transmission efficiency (including route length) have a significant impact on the performance of a routing protocol for vehicular ad hoc networks (VANETs). Existing routing protocols do not seriously address all these issues and are not evaluated for a real VANET environment. Therefore, it is difficult for these protocols to attain a high performance and to work properly under various scenarios. In this paper, we first discuss the challenges of routing in VANETs based on the data acquired from real-world experiments and then propose a routing protocol that is able to learn the best transmission parameters by interacting with the environment. The protocol takes into account multiple metrics, specifically data transmission rate, vehicle movement, and route length. We use both real-world experiments and computer simulations to evaluate the proposed protocol.
Scientific journal, English - Adaptive Multi-hop Broadcasting Considering Packet Payload Size
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE Technical Report, 電子情報通信学会, 115, 327,CQ2015-83, 43-48, Nov. 2015
English - Comparing TCP Congestion Control Algorithms Based on Passively Collected Packet Traces
Toshihiko Kato; Atsushi Oda; Celimuge Wu; Satoshi Ohzahata
ICSNC 2015, 135-141, Nov. 2015, Peer-reviwed
International conference proceedings, English - Efficient Broadcasting in VANETs Using Dynamic Backbone and Network Coding
Celimuge Wu; Xianfu Chen; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 14, 11, 6057-6071, Nov. 2015, Peer-reviwed, Multihop data dissemination in vehicular ad hoc networks (VANETs) is very important for the realization of collision avoidance systems and many other interesting applications. However, designing an efficient data dissemination protocol for VANETs has been a challenging issue due to vehicle movements, limited wireless resources, and the lossy characteristics of wireless communication. In this paper, we propose a protocol that can provide a lightweight and reliable solution for data dissemination in VANETs. The protocol employs dynamically generated backbone vehicles to disseminate broadcast packets to reduce the MAC-layer contention time at each node while maintaining a high packet dissemination ratio by taking into account vehicle movement dynamics and the link quality between vehicles for the backbone selection. The protocol also uses network coding to reduce the protocol overhead and to improve the packet reception probability as compared with conventional approaches. We use theoretical analysis and computer simulations to show the advantage of the proposed protocol over other existing alternatives.
Scientific journal, English - A routing protocol for VANETs with adaptive frame aggregation and packet size awareness
Celimuge Wu; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
IEEE International Conference on Communications, Institute of Electrical and Electronics Engineers Inc., 2015-, 6565-6570, 09 Sep. 2015, Peer-reviwed, Existing multi-hop routing protocols for vehicular ad hoc networks (VANETs) do not consider the packet payload size and some important MAC layer issues for the route selection. In this paper, we first solve the performance anomaly problem by providing the same transmission time for different nodes which have different channel qualities using an adaptive frame aggregation mechanism. Next, we propose a packet size-aware routing protocol where a communication route is determined by taking into account the payload size of data packets. We consider multiple metrics for the route selection specifically vehicle mobility, frame aggregation efficiency, and link quality. The proposed protocol is evaluated using real-world experiments as well as computer simulations.
International conference proceedings, English - Reducing Congestion in the Tor Network with Circuit Switching
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Journal of Information Processing, 23, 5, 589-602, Sep. 2015, Peer-reviwed
Scientific journal, English - A Packet Size-aware Multi-hop Broadcast Protocol for VANETs Based on Adaptive Redundancy
Celimuge Wu; Xianfu Chen; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
The 24th International Conference on Computer Communications and Networks (ICCCN), 8 pages, Aug. 2015, Peer-reviwed
International conference proceedings, Japanese - Joint Fuzzy Relays and Network-Coding-Based Forwarding for Multihop Broadcasting in VANETs
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 16, 3, 1415-1427, Jun. 2015, Peer-reviwed, In vehicular ad hoc networks (VANETs), due to the limited radio propagation range of wireless devices, many safety applications require a multihop broadcast protocol to disseminate traffic warning information. However, providing an efficient multihop forwarding of broadcast messages has been a challenging problem due to vehicle movement, limited wireless resources, and unstable signal strength. In this paper we propose a broadcast protocol that can provide a low message overhead and a high packet dissemination ratio. The proposed scheme uses a fuzzy logic algorithm to choose the next hop relay nodes and uses network coding to improve the packet dissemination ratio without increasing the message overhead. By using the fuzzy logic algorithm, the protocol can choose the best relay node by taking intervehicle distance, vehicle velocity, and link quality into account. Network coding is used to improve the packet reception ratio by utilizing the broadcast nature of wireless channels. We show the effectiveness of the proposed scheme by using both theoretical analysis and computer simulations.
Scientific journal, English - Inter-vehicle Communications: Research Challenges & Opportunities
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Technical Report of IEICE, 115, 42, IN2015-6, 27-32, May 2015, Invited
Symposium, English - Design of EV Common Service Platform
Jing Wei; Jinglin Li; Zhihan Liu; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
The 2015 Fourth ICT International Student Project Conference, 4 pages, May 2015, Peer-reviwed
International conference proceedings, English - Combining Sequential Minimal Optimization and Naïve Bayes Algorithms for Accurate Data Classification
Phetlasy Sornxayya; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
The 2015 Fourth ICT International Student Project Conference, 4 pages, May 2015, Peer-reviwed
International conference proceedings, English - Evaluation of Dynamic Circuit Switching to Reduce Congestion in Tor
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
25TH INTERNATIONAL TELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (ITNAC 2015), IEEE, 326-331, 2015, Peer-reviwed, The Tor network is a widespread overlay anonymous network that is used by millions of users today. Tor focuses on improving the privacy of its users by routing their traffics through a series of onion routers that are located around the world. Since Tor operations mainly depend on volunteers who donated onion routers in the network, there are variances of capacities amongst different onion routers, which degrade the performances of Tor. In an effort to reduce the congestion problems in Tor, first we implemented control metrics to detect congestion on the entry OR. Second, we performed dynamic estimation of circuit congestion to select the best path in Tor. Third, we addressed the unfair distribution of bandwidth between the bulk and light traffics in Tor. We distributed the light and bulk traffics in Tor by having almost the same throughputs compared to default Tor multiplexing circuit approach. We use RTTs, circuit congestion and OR capacities as the main metrics to select the path. From our experimental analysis, we showed that our circuit switching method is effective to reduce the congestion problems in Tor.
International conference proceedings, English - Cloud on the road: an autonomic computing framework in vehicular environment
Jingyun Feng; Celimuge Wu; Yusheng Ji
IEICE Technical Report, 114, 404, 7-12, Jan. 2015
Symposium, English - An Intelligent Broadcast Protocol for VANETs Based on Transfer Learning
Celimuge Wu; Yusheng Ji; Xianfu Chen; Satoshi Ohzahata; Toshihiko Kato
2015 IEEE 81ST VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING), IEEE, 6 pages, 2015, Peer-reviwed, Designing an efficient multi-hop broadcast protocol is very important for the realization of collision avoidance systems and other many interesting applications in vehicular ad hoc networks (VANETs). Existing protocols are optimized for a specific scenario, and are not capable of working in various scenarios. Therefore, designing an intelligent protocol which can tune itself in relation to the change of network environment is particularly important. In this paper, we propose a broadcast protocol which is able to make forwarding decision based on a self-learning mechanism. The protocol employs a fuzzy logic-based relay node selection approach to take into account multiple metrics for the forwarding algorithm. The parameters used for the fuzzy logic are tuned online using a reinforcement learning approach. Transfer learning is used to transfer knowledge to new arriving vehicles (agents) in order to shorten the convergence time. The combination of reinforcement learning, transfer learning and fuzzy logic can provide an intelligent solution for broadcasting in VANETs. We conduct computer simulations to evaluate the proposed protocol.
International conference proceedings, English - A Learning Approach for Traffic Offloading in Stochastic Heterogeneous Cellular Networks
Xianfu Chen; Celimuge Wu; Yifan Zhou; Honggang Zhang
2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE, 3347-3351, 2015, Peer-reviwed, This paper addresses energy-aware traffic offloading in stochastic heterogeneous cellular networks (HCNs). The objective is to minimize energy consumption of the HCN while maintaining Quality-of-Service experienced by the mobile users. For each cell, the energy consumption depends on its associated system load, which is coupled with system loads in other cells due to the sharing over a common spectrum band. Such a traffic offloading problem is modeled by a discrete-time Markov decision process (DTMDP). Based on the traffic observations and the traffic offloading operations, the network controller learns to solve the optimal traffic offloading strategy with no prior knowledge of the DTMDP statistics. To deal with the curse of dimensionality, we design a centralized Q-learning with compact state representation algorithm, which is named as QC-learning. Moreover, a decentralized QC-learning algorithm is developed such that the macro-cell base stations (BSs) can independently manage the operations of small-cell BSs by making use of the network information obtained from the network controller. Simulations validate the proposed studies.
International conference proceedings, English - A Routing Protocol for VANETs with Adaptive Frame Aggregation and Packet Size Awareness
Celimuge Wu; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE, 6565-6570, 2015, Peer-reviwed, Existing multi-hop routing protocols for vehicular ad hoc networks (VANETs) do not consider the packet payload size and some important MAC layer issues for the route selection. In this paper, we first solve the performance anomaly problem by providing the same transmission time for different nodes which have different channel qualities using an adaptive frame aggregation mechanism. Next, we propose a packet size-aware routing protocol where a communication route is determined by taking into account the payload size of data packets. We consider multiple metrics for the route selection specifically vehicle mobility, frame aggregation efficiency, and link quality. The proposed protocol is evaluated using real-world experiments as well as computer simulations.
International conference proceedings, English - Performance Evaluation of Time Slot Based QoS Aware Ad Hoc Network Scheme for CBR and TCP Flows
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2015 17TH ASIA-PACIFIC NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM APNOMS, IEEE, 6 pages, 139-144, 2015, Peer-reviwed, We propose a QoS supporting ad hoc network scheme which employs a hybrid approach utilizing both TDMA and 802.11 DCF and present performance evaluation results of the scheme. In the scheme, TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. We evaluate the proposed scheme for various numbers of TCP flows and different CBR data rates with QualNet simulator. Simulation results show that the protocol is able to provide an efficient solution for QoS control in ad hoc networks by combing TDMA and 802.11 DCF.
International conference proceedings, English - Can DTN Improve the Performance of Vehicle-to-roadside Communication?
Celimuge Wu; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
2015 IEEE 26TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATIONS (PIMRC), IEEE, 6 pages, 1934-1939, 2015, Peer-reviwed, We propose a routing protocol for drive-thru Internet access in delay tolerant vehicular networks. The contribution of this paper is two-folds. First, we propose a new approach which utilizes the concept of delay tolerant network (DTN) to supplement the conventional communication approach. Second, we propose an algorithm to schedule DTN transmissions in order to maximize the system throughput. The proposed protocol is able to attain higher TCP throughput than the conventional approach by providing more efficient wireless resource utilization. We use theoretical analysis and computer simulations to evaluate the proposed protocol.
International conference proceedings, English - Sequential Combination of Two Classifier Algorithms for Binary Classification to Improve the Accuracy
Sornxayya Phetlasy; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
PROCEEDINGS OF 2015 THIRD INTERNATIONAL SYMPOSIUM ON COMPUTING AND NETWORKING (CANDAR), IEEE, 5 pages, 576-580, 2015, Peer-reviwed, Binary classification is a process of classifying the elements of a data set into two groups on the basis of a classification rule. It is useful and widely applied in many fields: Information Technology, Business, Medical Diagnosis, Finance, and so on. The problems of the previous works do not specify clearly which classifier utilizes to minimize which type of false, False Positive (FP) or False Negative (FN), because they are tradeoffs. In this study, we propose a hybrid method for data classification with two different classifier algorithms. The first classifier responds to reduce FN, and the second classifier is in charge of reducing FP. Our experiments utilize the data set of breast cancer, Wisconsin Breast Cancer (WBC) which is popular data set among the researchers for breast cancer diagnosis. The results show that the proposed method improves accuracy.
International conference proceedings, English - Future Channel Utilization-Aware Routing for Cognitive Radio Ad Hoc Networks
Celimuge Wu; Juan Xu; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E98B, 1, 107-115, Jan. 2015, Peer-reviwed, Cognitive radio ad hoc networks can be used to solve the problems of limited available spectrum and inefficient spectrum usage by adaptively changing their transmission parameters. Routing protocol design has a significant impact on the network performance. However, an efficient protocol that takes account of primary user flows and the long-term channel assignment issue in route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog chooses a route by considering the effect on the primary users, available channel bandwidth and link reliability. AODV-cog also takes account of future channel utilization which is an important but underexplored issue. AODV-cog switches channels for secondary user flows when network congestion occurs. We use theoretical analysis and computer simulations to show the advantage of AODV-cog over existing alternatives.
Scientific journal, English - Packet Size-Aware Broadcasting in VANETs With Fuzzy Logic and RL-Based Parameter Adaptation
Celimuge Wu; Xianfu Chen; Yusheng Ji; Fuqiang Liu; Satoshi Ohzahata; Tsutomu Yoshinaga; Toshihiko Kato
IEEE ACCESS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 3, 2481-2491, 2015, Peer-reviwed, Most existing multi-hop broadcast protocols for vehicular ad hoc networks do not consider the problem of how to adapt transmission parameters according to the network environment. Besides the propagation environment that determines the channel bit error rate, packet payload size has a significant effect on the packet loss rate. In this paper, we first discuss the effect of packet size on the packet reception ratio, and then propose a broadcast protocol that is able to specify the best relay node by taking into account the data payload size. The proposed protocol employs a fuzzy logic-based algorithm to jointly consider multiple metrics (link quality, inter-vehicle distance, and vehicle mobility) and uses a redundancy transmission approach to ensure high reliability. Since the fuzzy membership functions are tuned by using reinforcement learning, the protocol can adapt to various network scenarios. We use both real-world experiments and computer simulations to evaluate the proposed protocol.
Scientific journal, English - Inferring TCP Congestion Control Algorithms by Correlating Congestion Window Sizes and their Differences
Toshihiko Kato; Atsushi Oda; Shun Ayukawa; Celimuge Wu; Satoshi Ohzahata
The Ninth International Conference on Systems and Networks Communications, 42-47, Oct. 2014, Peer-reviwed
International conference proceedings, French - A Distributed Dynamic Channel Assignment and Routing Framework for Cognitive Sensor Systems
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E97D, 10, 2613-2622, Oct. 2014, Peer-reviwed, With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of a smart grid system. Cognitive radio technology can be used to facilitate the deployment of smart grid systems. In this paper, we propose a data collection and dissemination framework for cognitive radio smart grid systems to fully utilize wireless resources while maintaining a reliably connected and efficient topology for each channel. In the proposed framework, each sensor node selects a channel considering the primary user (PU) channel utilization and network connectivity. In this way, the data collection and dissemination can be performed with a high reliability and short delay while avoiding a harmful effect on primary users. We use computer simulations to evaluate the proposed framework.
Scientific journal, English - Coded packets over lossy links: A redundancy-based mechanism for reliable and fast data collection in sensor networks
Celimuge Wu; Yusheng Ji; Juan Xu; Satoshi Ohzahata; Toshihiko Kato
COMPUTER NETWORKS, ELSEVIER SCIENCE BV, 70, 179-191, Sep. 2014, Peer-reviwed, In wireless sensor networks (WSNs), many applications require a high degree of reliability with low delay. Due to the lossy nature of wireless channels, achieving reliable communication can be very challenging. The most commonly adopted approach for achieving reliability is the acknowledgment based retransmission mechanism; however, this approach is inefficient in terms of end-to-end delay especially when there are a large number of hops from a sensor to the sink node. In this paper, we propose a redundancy-based approach that achieves high reliability and low end-to-end delay. The proposed protocol employs a network coding-based approach to improve packet redundancy when a link is unreliable or there is a strict end-to-end delay requirement. The protocol adaptively changes the redundancy level according to the application requirements and link loss rate. The protocol can be implemented easily because modification of the application layer at the source node and destination node is the only mandatory requirement. We implement the proposed mechanism on a real testbed which consists of IRIS motes, and evaluate the performance of the proposed mechanism using real-world experiments, network simulations and theoretical analysis. (C) 2014 Elsevier B.V. All rights reserved.
Scientific journal, English - A Multi-hop Broadcast Protocol for VANETs Utilizing Backbone-based Forwarding and Network Coding
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE Technical Report, The Institute of Electronics, Information and Communication Engineers, 114, 160, 75-80, Jul. 2014, In this paper, we propose a broadcast protocol for vehicular ad hoc networks. The protocol can reduce the MAC layer contention time by using backbone-based forwarding. Network coding is used to attain high reliability with low overhead. Therefore, the protocol is able to provide a lightweight and reliable solution for data dissemination in VANETs. We use theoretical analysis and computer simulations to show the advantage of the proposed protocol over other existing alternatives.
Symposium, English - TCP Performance Problem on Timeout Retransmission Triggered by Bursty Packet Losses
Weikai Wang; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
International Conference on Theory and Practice in Modern Computing, 141-148, Jul. 2014, Peer-reviwed
International conference proceedings, English - Inter-flow Network Coding for Unicast Routing Protocols in Vehicular Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE Technical Report, The Institute of Electronics, Information and Communication Engineers, 114, 110, 1-6, Jun. 2014, Designing an effcient unicast routing protocol for vehicular ad hoe networks has been a challenging issue due to the vehicle movement, limited wireless resources and lossy feature of wireless channel. We propose a protocol which utilizes inter-flow network coding to route data messages. The proposed protocol uses common backbone vehicles for different traffic flows. A reliability connected backbone is selected by considering vehicle movement dynamics and link quality between vehicles. By using inter-flow network coding at the backbone vehicles, the protocol can reduce the number of generated packets by 25% in most cases as compared to the traditional routing approach. As a result, the proposed protocol can provide a high packet delivery ratio, low overhead and low delay. We show the effectiveness of the protocol using computer simulations.
Symposium, English - Analyzing the Drawbacks of Node-Based Delays in Tor
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
IEEE CQR International Workshop, 1-6, May 2014, Peer-reviwed
International conference proceedings, English - Experimental Analysis of TCP Behaviors against Bursty Packet Losses Caused by Transmission Interruption
Weikai Wang; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
The Thirteenth International Conference on Networks, 136-141, Feb. 2014, Peer-reviwed
International conference proceedings, English - A Circuit Switching Method for Improving Congestion of Tor Network
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
2014 NINTH INTERNATIONAL CONFERENCE ON BROADBAND AND WIRELESS COMPUTING, COMMUNICATION AND APPLICATIONS (BWCCA), IEEE, 416-421, 2014, Peer-reviwed, The Tor Network is a low-latency anonymity and censorship resistance network, which relaying traffics through series of onion routers (OR) before being forwarded to the destination. Tor is vulnerable to network congestion and performance problems, due to bulk and light traffics arc competing to transfer data on a single TCP connection. A large fraction of the available network capacity is consumed by bulk users' traffic, resulting in higher buffer occupancy and delays for interactive light users. To address the problems, we propose a method of switching the bulk traffic that contributes to increasing delays to another path, which built preemptively at the beginning. This approach allows the light interactive circuits to utilize the bandwidth resources well and, easily writes their cells from the circuit queue to the output buffer and outgoing TCP socket. Our approach of switching bulk circuits in the overloaded ORs comes to effect if the Tor output queues increases beyond the threshold value, and when sending TCP socket is congested and un-writable. Our goal is to reduce the congestion in the ORs and improve the throughput from the incoming traffic (upstream), and outgoing traffic (downstream). Through measurements and evaluation conducted in the live Tor network, we observed that the throughput of the light interactive traffic is improved. The light circuit traffics are no longer forced to wait behind the bulk traffic when transfer their data to the outgoing TCP socket.
International conference proceedings, English - A MAC Protocol for Delay-sensitive VANET Applications With Self-learning Contention Scheme
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 IEEE 11TH CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE (CCNC), IEEE, 729-734, 2014, Peer-reviwed, Packet delivery ratio and end-to-end delay are the two most important metrics for vehicular ad hoc network applications. In this paper, we propose a MAC layer protocol which can provide a high packet delivery ratio, low end-to-end delay, and high fairness for various scenarios. The proposed protocol uses a Q-Learning algorithm to adjust the contention window size in order to provide an efficient channel access scheme for various network situations. The simulation results demonstrate the advantage of the proposed protocol over other alternatives.
International conference proceedings, English - Resolving bufferbloat problem in 802.11n WLAN by weakening MAC loss recovery for TCP stream
Masataka Nomoto; Toshihiko Kato; Celimuge Wu; Satoshi Ohzahata
Proceedings of the IASTED International Conference on Parallel and Distributed Computing and Networks, PDCN 2014, Acta Press, 293-300, 2014, Peer-reviwed, IEEE 802.11n wireless LANs provide high-speed data transfer. If the radio condition degrades, however, the transfer rate will be reduced significantly and there may be some problems in the data transfer. In order to clarify this problem, we have evaluated the TCP performance over IEEE 802.11n LAN by changing the distance between the access point and a terminal. As a result, a severe increase of round trip time has been measured in the case of low data rate. This is a sort of bufferbloat problem, which is being actively studied in recent years. The detailed analysis of this experiment is our first contribution. We have inferred that one of the reasons for this increased delay is the powerful retransmission function of 802.11n. So, we propose, as the second contribution, a method to improve TCP delay performance by reducing this retransmission capability and by generating TCP segment loss intentionally. This paper describes the performance evaluations for our proposal in comparison with CoDel, which is an active queue management approach, and with the native 802.11n.
International conference proceedings, English - Joint MAC and Network Layer Control for VANET Broadcast Communications Considering End-to-end Latency
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 IEEE 28TH INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA), IEEE, 689-696, 2014, Peer-reviwed, In vehicular ad hoc networks (VANETs), multi-hop broadcast communications are required for many applications including driver assistance systems. However, providing a low end-to-end latency has been very challenging. In this paper, we propose a joint MAC network layer multi-hop broadcast protocol. For the network layer, the proposed protocol reduces the number of sender nodes by using common forwarder nodes for different traffic flows. At the MAC layer, the proposed protocol uses a Q-Learning algorithm to adjust the contention window size. By interacting with the environment, the protocol can find the best contention window size to transmit data packets and therefore can provide a high packet dissemination ratio and low end-to-end delay for various scenarios. The simulation results demonstrate the advantage of the proposed protocol over other existing alternatives.
International conference proceedings, English - Toward a Totally Distributed Flat Location Service for Vehicular Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 IEEE 79TH VEHICULAR TECHNOLOGY CONFERENCE (VTC-SPRING), IEEE, 1-6, 2014, Peer-reviwed, Many routing protocols in vehicular ad hoc networks (VANETs) utilize location information to find a route to the destination. However, tracking the location information of other nodes is very challenging in highly dynamic VANETs. We propose a location service which can provide location information with low overhead and low delay. The location service periodically disseminates the location of each vehicle to 3-hop distance for every second with very low overhead. By eliminating location errors by taking account of the velocity of a vehicle, the proposed protocol can provide accurate position information. The location service also provides a lightweight location query mechanism for longer distance destination nodes. We show the effectiveness of the protocol by using theoretical analysis and computer simulations.
International conference proceedings, English - Providing Fast Broadcasting by Reserving Time Slots for Multi-hop Distance in VANETs
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 INTERNATIONAL WIRELESS COMMUNICATIONS AND MOBILE COMPUTING CONFERENCE (IWCMC), IEEE, 213-218, 2014, Peer-reviwed, In vehicular ad hoc networks (VANETs), multi-hop broadcast protocols arc required for many applications including driver assistance systems. However, providing a low end-to-end latency has been very challenging. In this paper, we propose a protocol which can provide a fast channel access for broadcast traffic flows in %AMA's. The protocol introduces new control messages to reserve time slots fill- the li)rwarder nodes and eliminate the hidden terminal problem. By providing a contention-free multihop forwarding scheme based on reliably generated forwarding backbone, the protocol can provide low end-to-end delay and high packet dissemination ratio. The theoretical analysis and simulation results demonstrate the advantage of the proposed protocol over other existing alternatives.
International conference proceedings, English - Greenly Offloading Traffic In Stochastic Heterogeneous Cellular Networks
Xianfu Chen; Tao Chen; Celimuge Wu; Mika Lasanen
2014 1ST INTERNATIONAL WORKSHOP ON COGNITIVE CELLULAR SYSTEMS (CCS), IEEE, Accepted, 2014, Peer-reviwed, Invited, This paper puts forwards an on-line reinforcement learning framework for the problem of traffic omoading in a stochastic Markovian heterogeneous cellular network (HCN), where the time-varying traffic demand of mobile terminals (MTs) can be omoaded from macrocells to small-cells. Our aim is to minimize the average energy consumption of the HCN while maintaining the Quality-of-Service (QoS) experienced by MTs. For each cell (i.e., a macrocell or a small-cell), the energy consumption is determined by its system load which is coupled with the system loads served in other cells due to the sharing over a common frequency band. We model the energy-aware traffic offioading in such HCNs as a constrained Markov decision process (C-MDP). The statistics of the C-MDP depends on a selected traffic omoading strategy and thus, the actions performed by a network controller have a long-term impact on the network state evolution. Based on the traffic demand observations and the traffic omoading operations, the controller gradually optimizes the strategy with no prior knowledge of the process statistics. Numerical experiments are conducted to show the effectiveness of the proposed learning framework in balancing the tradeoff between energy saving and QoS satisfaction.
International conference proceedings, English - Multi-hop Broadcasting in VANETs Integrating Intra-flow and Inter-flow Network Coding
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 IEEE 80TH VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL), IEEE, 1-6, 2014, Peer-reviwed, Multi-hop data dissemination in vehicular ad hoc networks (VANETs) is very important for the realization of collision avoidance systems and other many interesting applications. However, designing an efficient data dissemination protocol in VANETs has been a challenging issue due to vehicle movements, limited wireless resources and lossy characteristics of wireless communication. In this paper, we propose a protocol which employs intra-flow and inter-flow network coding to reduce the protocol overhead as compared to traditional protocols. The protocol also can improve the packet reception probability at the receiver nodes by using the network coding. Therefore, the protocol can provide a lightweight and reliable solution for data dissemination in VANETs. We use theoretical analysis and computer simulations to show the advantage of the proposed protocol over other existing alternatives.
International conference proceedings, English - A QoS Supporting Ad Hoc Network Protocol Combing Admission Based TDMA and 802.11 DCF
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2014 16th Asia-Pacific Network Operations and Management Symposium (APNOMS), IEEE, 1-4, 2014, Peer-reviwed, We propose a QoS supporting ad hoc network protocol which employs a hybrid approach utilizing both TDMA and 802.11 DCF. TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. TDMA time slots are assigned on admission basis in a distributed manner by utilizing network routing information and considering current assignment situation. In DCF period, frames are transmitted not to disturb the TDMA period. By combing TDMA and 802.11 DCF, the proposed ad hoc network is able to provide an efficient solution for QoS control in ad hoc networks. We use QualNet simulator to evaluate the proposed scheme.
International conference proceedings, English - Multi-hop Broadcasting in WAVE Multi-channel Vehicular Networks: Single Transceiver Case
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 IEEE 17TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS (ITSC), IEEE, 1091-1096, 2014, Peer-reviwed, Multi-hop data dissemination in vehicular ad hoc networks (VANETs) has been very challenging due to the vehicle movement, various vehicle densities and the lossy characteristics of a wireless channel. The problem of how to provide an efficient broadcasting of time-critical broadcast messages under multi-channel operation of IEEE WAVE standard has not been discussed sufficiently. In this paper, we discuss the multi-hop broadcast problem in multi-channel environment defined by IEEE WAVE, and propose a multi-hop broadcast protocol which conducts efficient channel utilization with single transceiver. We use computer simulations to show the advantage of the proposed protocol over other existing alternatives.
International conference proceedings, English - Making Inter-flow Network Coding Possible for Unicast Routing in VANETs
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
2014 INTERNATIONAL CONFERENCE ON CONNECTED VEHICLES AND EXPO (ICCVE), IEEE, 7 pages, 829-835, 2014, Peer-reviwed, Designing an efficient unicast routing protocol for vehicular ad hoc networks has been a challenging issue due to the vehicle movement, limited wireless resources and lossy feature of wireless channel. We propose a protocol which utilizes inter-flow network coding to route data messages. The proposed protocol uses common backbone vehicles for different traffic flows. A reliability connected backbone is selected by considering vehicle movement dynamics and link quality between vehicles. By using inter-flow network coding at the backbone vehicles, the protocol can reduce the number of generated packets by 25% in most cases as compared to the traditional routing approach. As a result, the proposed protocol can provide a high packet delivery ratio, low overhead and low delay. We show the effectiveness of the protocol using theoretical analysis and computer simulations.
International conference proceedings, English - A VANET Routing Protocol Considering MAC Efficiency
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE Technical Report, 113, Nov. 2013
Symposium, English - Practical Solution for Broadcasting in VANETs Using Neighbor Information
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E96B, 11, 2856-2864, Nov. 2013, Peer-reviwed, Due to vehicle movement and lossy wireless channels, providing a reliable and efficient multi-hop broadcast service in vehicular ad hoc networks (VANETs) is a well-known challenging problem. In this paper, we propose BR-NB (broadcast with neighbor information), a fuzzy logic based multi-hop broadcast protocol for VANETs. BR-NB achieves a low overhead by using only a subset of neighbor nodes to relay data packets. For the relay node selection, BR-NB jointly considers multiple metrics of the inter-vehicle distance, vehicle mobility and link quality by employing fuzzy logic. Since the expected coverage and vehicle mobility are inferred from the two-hop neighbor information which can be acquired from the hello message exchange, BR-NB is independent of position information. BR-NB provides a practical and portable solution for broadcast services in VANETs. We use computer simulations and real-world experiments to evaluate the performance of BR-NB.
Scientific journal, English - Flexible, Portable, and Practicable Solution for Routing in VANETs: A Fuzzy Constraint Q-Learning Approach
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 62, 9, 4251-4263, Nov. 2013, Peer-reviwed, Vehicular ad hoc networks (VANETs) have been attracting interest for their potential uses in driving assistance, traffic monitoring, and entertainment systems. However, due to vehicle movement, limited wireless resources, and the lossy characteristics of a wireless channel, providing a reliable multi-hop communication in VANETs is particularly challenging. In this paper, we propose PFQ-AODV, which is a portable VANET routing protocol that learns the optimal route by employing a fuzzy constraint Q-learning algorithm based on ad hoc on-demand distance vector (AODV) routing. The protocol uses fuzzy logic to evaluate whether a wireless link is good or not by considering multiple metrics, which are, specifically, the available bandwidth, link quality, and relative vehicle movement. Based on an evaluation of each wireless link, the proposed protocol learns the best route using the route request (RREQ) messages and hello messages. The protocol can infer vehicle movement based on neighbor information when position information is unavailable. PFQ-AODV is also independent of lower layers. Therefore, PFQ-AODV provides a flexible, portable, and practicable solution for routing in VANETs. We show the effectiveness of the proposed protocol by using both computer simulations and real-world experiments.
Scientific journal, English - Improving VANET unicast routing protocols by using cooperative relays and network coding
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
IEICE Technical Report, 113, Oct. 2013
Symposium, English - A low latency path diversity mechanism for sender-oriented broadcast protocols in VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Ad Hoc Networks, 11, 7, 2059-2068, Sep. 2013, Peer-reviwed, In vehicular ad hoc networks, many applications require a low latency and high reliability especially the safety applications. Reliable multi-hop broadcast protocols have been widely discussed recently. However, most of them use explicit acknowledgments and timeout retransmissions to provide reliability. The retransmission method incurs delays when a packet loss cannot be detected on time. Acknowledgment messages also increase the MAC layer contention time at each node. In order to provide a high reliability and low latency with a low overhead, we propose a mechanism which utilizes path diversity. In the proposed mechanism, a message is delivered through two different paths. By cooperation of these different paths, broadcast messages can be disseminated with a short delay and a high reliability compared with the acknowledgment based retransmission approach. Since the proposed mechanism does not use any explicit acknowledgment message, the message overhead is low. We evaluate the proposed mechanism using both theoretical analysis and computer simulations. © 2012 Elsevier B.V. All rights reserved.
Scientific journal, English - Optimization of Area Splitting To Minimize OSPF LSA Exchange
Toshihiko Kato; Tsukasa Miyamae; Celimuge Wu; Satoshi Ohzahata
Proc. of IADIS Theory and Practice in Modern Computing, 11-18, Jul. 2013, Peer-reviwed
International conference proceedings, English - Practical Solution for Broadcasting in VANETs using Neighbor Information
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEICE Transaction on Communication, J97-B, 2, 110-119, 2013, Peer-reviwed
Scientific journal, English - Network Coding Assisted Cooperative Relay Scheme for Sender-oriented Broadcast in VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC), IEEE, 1369-1374, 2013, Peer-reviwed, In vehicular ad hoc networks (VANETs), a multi-hop broadcast protocol is required to disseminate traffic warning information. Reducing broadcast message overhead while maintaining a high dissemination ratio is a very challenging task. In this paper, we study how to improve the performance of sender-oriented broadcast protocols using network coding. We propose a scheme which uses network coding to improve the packet dissemination ratio without increasing the message overhead. In the proposed scheme, the source node specifies two relay nodes. With cooperation between two relay nodes, the proposed scheme significantly increases the packet reception ratio by utilizing the broadcast nature of wireless channel. We show the effectiveness of the proposed scheme by using both theoretical analysis and computer simulations.
International conference proceedings, English - Joint MAC network layer broadcast protocol for vehicular ad hoc networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 IEEE International Conference on Communications Workshops, ICC 2013, 495-499, 2013, Peer-reviwed, Packet dissemination ratio and end-to-end delay are the two most important metrics for multi-hop broadcast protocols in vehicular ad hoc networks (VANETs). In this paper, we propose a joint MAC network layer broadcast protocol. The proposed protocol uses selected relay nodes to forward packets. A reliable communication is conducted between the sender node and each relay node by using MAC layer acknowledgments. The protocol can provide a low delay and high packet dissemination ratio by reducing the packet loss detection delay and providing retransmissions at the MAC layer. We show the effectiveness of the proposed protocol by using both theoretical analysis and computer simulations. © 2013 IEEE.
International conference proceedings, English - A Loss-tolerant Scheme for Unicast Routing in VANETs using Network Coding
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 9TH INTERNATIONAL WIRELESS COMMUNICATIONS AND MOBILE COMPUTING CONFERENCE (IWCMC), IEEE, 1058-1063, 2013, Peer-reviwed, In vehicular ad hoc networks (VANETs), designing an efficient routing protocol is particularly challenging due to the vehicle movement and lossy wireless channel. A packet can be lost at a forwarder node even when a proper node is selected as the forwarder. In this paper, we propose a loss-tolerant scheme for unicast routing protocols in VANETs. The proposed scheme uses multiple forwarder nodes to improve the packet reception ratio at the forwarders. The scheme uses network coding to reduce the number of required transmissions, resulting in a significant improvement of end-to-end packet delivery ratio without increasing the message overhead. We show the effectiveness of the proposed scheme by using both theoretical analysis and computer simulations.
International conference proceedings, English - Data Dissemination with Dynamic Backbone Selection in Vehicular Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 IEEE 78TH VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL), IEEE, 1-6, 2013, Peer-reviwed, Efficient data dissemination in Vehicular Ad hoc NETworks (VANETs) has been a challenging issue due to vehicle movements, limited wireless resources and lossy characteristics of wireless communication. In this paper, we use dynamically generated backbone vehicles to disseminate information. The proposed protocol selects the backbone vehicles by considering vehicle movement dynamics and link quality between vehicles. The proposed approach can significantly reduce the MAC layer contention time at each node while maintaining a high packet dissemination ratio. We show the effectiveness of the proposed protocol by using theoretical analysis and computer simulations.
International conference proceedings, English - Can We Generate Efficient Routes by Using Only Beacons? Backbone Routing in VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 IEEE 24TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATIONS (PIMRC), IEEE, 2929-2934, 2013, Peer-reviwed, Point-to-point data delivery in Vehicular Ad hoc NETworks (VANETs) has been a challenging issue due to the vehicle movement, limited wireless resources and lossy feature of wireless channel. In VANETs, due to the frequent topology changes, traditional ad hoc routing protocols incur a high overhead for the route maintenance. In this paper, we propose a new approach to route data messages in VANETs. The proposed protocol uses dynamically generated backbone vehicles to forward data messages. The protocol generates the backbone by using only hello messages. The protocol selects the backbone vehicles by considering vehicle movement dynamics and link quality between vehicles. As a result, the selected backbone vehicles generate a reliably connected network. By using packet forwarding with the backbone nodes, the proposed protocol can reduce the message overhead and MAC layer contention time at each node while maintaining a high packet delivery ratio. We show the effectiveness of the proposed protocol with both theoretical analysis and computer simulations.
International conference proceedings, English - Effectiveness of Performance Flag Selection for Enhancing Tor Circuits
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
2013 15TH ASIA-PACIFIC NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM (APNOMS), IEEE, 1-3, 2013, Peer-reviwed, Tor is an open network that defends against network surveillance, preserving personal freedom and privacy on the Internet. The barrier to a more widespread use of Tor is a variety of performance problems. We focused on enhancing Tor circuits by selecting the relays on the basis of assigned performance flags, which are known as a guard, fast and stable flags. We observed that these simple strategies can improve the selection method for relays with high bandwidth and TCP advertised window sizes. In this work, we regard bandwidth as the key factor in Tor design and path selection. We determine a better method of circuit selection based on actively measuring RTTs, TCP throughput and the TCP advertised window sizes of the relays.
International conference proceedings, English - An Improvement of OLSR Using Fuzzy Logic Based MPR selection
Narangerei Dashbyamba; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2013 15TH ASIA-PACIFIC NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM (APNOMS), IEEE, 1-6, 2013, Peer-reviwed, Optimized Link State Routing Protocol (OLSR) is a well-known proactive routing protocol for mobile ad hoc networks. OLSR reduces the number of control messages by using MPRs to forward topology control messages as compared with typical proactive protocols. Since OLSR does not consider the node mobility and signal strength condition for the MPR (MultiPoint Relays) selection, OLSR cannot work well in a highly mobile and lossy network. In this paper, we propose a protocol which improves OLSR by taking into account the node mobility and signal strength in the selection of MPRs. We use network simulations to evaluate the proposed protocol's performance.
International conference proceedings, English - A routing protocol for cognitive radio ad hoc networks giving consideration to future channel assignment
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Proceedings - 2013 1st International Symposium on Computing and Networking, CANDAR 2013, 227-232, 2013, Peer-reviwed, Cognitive radio technology can be used to solve the problems of limited available spectrum and inefficient spectrum usage by adaptively changing transmission parameters. By utilizing CR technology for dynamic and distributed multi-hop networks, cognitive radio ad hoc networks can efficiently utilize free wireless resources. However, the routing protocols for cognitive radio CSMA/CA ad hoc networks have not been discussed seriously. An efficient protocol considering primary user flows and channel assignment incurred network connectivity issue in the route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog chooses a route by considering the effect on the primary users, available channel bandwidth and link reliability. AODV-cog also takes in account of future channel utilization which is important but overlooked by existing works. AODV-cog switches channels for secondary user flows when network congestion is occurred. We use computer simulations to show the advantage of AODV-cog over existing alternatives. © 2013 IEEE.
International conference proceedings, English - A reliable and flexible data gathering protocol for battery limited wireless sensor networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
International Journal of Communication Networks and Distributed Systems, 11, 2, 139-156, 2013, Peer-reviwed, In this paper, we consider a wireless sensor network (WSN) for a clinical purpose. However, due to the fading in wireless communications and limited battery power of electronic devices, providing an efficient and reliable communication is extremely challenging. As a solution, we propose fuzzy one-phase pull (FOPP), a fuzzy logic-based one-phase pull protocol. The protocol considers signal strength, route length and residual energy in the route selection. The protocol employs a fuzzy logic to consider these metrics jointly. Since the parameters and the rules used in the fuzzy logic are reconfigurable, the proposed protocol can be used in any scenarios by simple parameter tuning. We also propose two mechanisms (timeout retransmission mechanism and double-path mechanism) to further improve the reliability of the protocol. We use computer simulations to evaluate the performance of the proposed protocol. Copyright © 2013 Inderscience Enterprises Ltd.
Scientific journal, English - VANET Broadcast Protocol Based on Fuzzy Logic and Lightweight Retransmission Mechanism
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E95B, 2, 415-425, Feb. 2012, Peer-reviwed, Vehicular ad hoc networks have been attracting the interest of both academic and industrial communities on account of their potential role in Intelligent Transportation Systems (ITS). However, due to vehicle movement and fading in wireless communications, providing a reliable and efficient multi-hop broadcast service in vehicular ad hoc networks is still an open research topic. In this paper, we propose FUZZBR (FUZZy BRoadcast), a fuzzy logic based multi-hop broadcast protocol for information dissemination in vehicular ad hoc networks. FUZZBR has low message overhead since it uses only a subset of neighbor nodes to relay data messages. In the relay node selection. FUZZBR jointly considers multiple metrics of inter-vehicle distance, node mobility and signal strength by employing the fuzzy logic. FUZZBR also uses a lightweight retransmission mechanism to retransmit a packet when a relay fails. We use computer simulations to evaluate the performance of FUZZBR.
Scientific journal, English - Reliable and Efficient Data Dissemination protocol in VANETs
Xingzhen Bai; Maofa Gong; Zhengzhong Gao; Shanshan Li
2012 INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS, NETWORKING AND MOBILE COMPUTING (WICOM), IEEE, 109-114, 2012, Peer-reviwed, Data dissemination in vehicular ad hoc networks (VANETs) has recently received considerable attention. Due to the unique characteristics of VANET, the implementation of reliable data dissemination among vehicles has encountered many challenges. In this paper, a reliable and efficient data dissemination scheme is presented. Relative locations between neighbor vehicles are predicted to improve delivery reliability. Based on assisted nodes which could customize the amount of data according to drivers' different requirements, the novel scheme increases the network connectivity while reducing redundant network traffic. Simulation results show that our novel scheme can obviously improve the network performance in terms of data dissemination rate and data dissemination delay.
International conference proceedings, English - An adaptive redundancy-based mechanism for fast and reliable data collection in WSNs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2012 IEEE 8TH INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING IN SENSOR SYSTEMS (DCOSS), IEEE, 347-352, 2012, Peer-reviwed, Wireless sensor networks (WSNs) can be used for a variety of applications. For many applications, a high reliability and low delay are required. Due to lossy feature of wireless channel, providing a reliable communication is very challenging. The most frequently used approach for providing the reliability is to use the acknowledgement based retransmission mechanism which increases the end-to-end delay especially when the number of hops from a sensor to the sink node is large. In this paper, we propose a redundancy-based approach to provide a high reliability while maintaining a low end-to-end delay. The proposed mechanism uses a redundant transmission when a link is unreliable or the end-to-end delay requirement is strict. We implement the proposed mechanism on a wireless sensor network which consists of IRIS motes, and evaluate the performance of the proposed mechanism.
International conference proceedings, English - Dynamic channel assignment and routing for cognitive sensor networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Proceedings of the International Symposium on Wireless Communication Systems, 86-90, 2012, Peer-reviwed, With the increase of the number of wireless sensing or metering devices, the collection of sensing data using wireless communication becomes an important part of many applications. Cognitive radio technology can be used to facilitate the deployment of a bandwidth efficient sensor system. In this paper, we propose a data collection and dissemination framework for cognitive radio sensor systems to fully utilize wireless resources while maintaining a reliably connected and efficient topology for each channel. In the proposed framework, each sensor node selects a channel considering primary user channel utilization and network connectivity. In this way, the data collection and dissemination can be performed with a high reliability and short delay while avoiding a harmful effect on primary users. We use computer simulations to evaluate the proposed framework. © 2012 IEEE.
International conference proceedings, English - How to Broadcast Efficiently in Vehicular Ad Hoc Networks Without GPS
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2012 IEEE VEHICULAR NETWORKING CONFERENCE (VNC), IEEE, 258-264, 2012, Peer-reviwed, In vehicular ad hoc networks (VANETs), a multi-hop broadcast protocol is required to disseminate traffic warning information to multiple receivers. Reducing broadcast message overhead is important because it could directly affect the packet collision probability and MAC layer contention time at each node. There have been some broadcast protocols for VANETs. However, many of them assume the availability of the global positioning system. In this paper, we propose a broadcast protocol which does not require position information. The protocol uses two-hop neighbor information to select relay nodes which are used to forward a packet. The proposed protocol also uses a joint redundancy and opportunistic transmission approach to recover a packet loss. We show the effectiveness of the proposed protocol by evaluating in a real vehicular ad hoc network.
International conference proceedings, English - Routing in VANETs: A Fuzzy Constraint Q-Learning Approach
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2012 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM), IEEE, 195-200, 2012, Peer-reviwed, Vehicular ad hoc networks (VANETs) can be used for the purpose of driving assistance, environment monitoring and entertainment. However, due to the vehicle movement, limited wireless resources and lossy feature of wireless channel, providing a reliable multi-hop communication in VANETs is particularly challenging. In this paper, we propose a VANET routing protocol which learns the optimal route by employing a fuzzy constraint Q-Learning algorithm. The protocol uses a fuzzy logic to evaluate a wireless link is whether good or not by considering multiple metrics of signal strength, available bandwidth and relative vehicle movement. Based on the evaluation of each wireless link, the proposed protocol learns the best route using the route request messages and hello messages. Upon reception of a route request message, each node maintains an evaluation value for each possible next hop node. In this way, the protocol can choose the best route, which is difficult to acquire in a typical reactive routing protocol. We show the effectiveness of the proposed protocol by using computer simulations.
International conference proceedings, English - A dynamic route change mechanism for mobile ad hoc networks
Celimuge Wu; Kazuya Kumekawa; Toshihiko Kato
International Journal of Communication Networks and Distributed Systems, 7, 1/2, 4-17, Jul. 2011, Peer-reviwed
Scientific journal, English - A Broadcast Path Diversity Mechanism for Delay Sensitive VANET Safety Applications
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Proc. of VNC 2011, 171-176, 2011, Peer-reviwed
International conference proceedings, English - Fuzzy One-phase Pull Diffusion for WSNs in Fading Channel
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2011 INTERNATIONAL CONFERENCE ON DISTRIBUTED COMPUTING IN SENSOR SYSTEMS AND WORKSHOPS (DCOSS), IEEE, 1-6, 2011, Peer-reviwed, Using wireless sensor networks (WSNs) for a clinical purpose has many potential advantages. However, due to fading feature of wireless channel, providing an efficient and reliable communication is very challenging. In this paper, we propose FUZZ-OPP (FUZZy One-Phase Pull), a fuzzy logic based one-phase pull protocol. The protocol considers signals strength, internode distance and residual energy in the route selection. The protocol employs a fuzzy logic to consider these metrics jointly. Since the parameters and the rules used in the fuzzy logic are all reconfigurable, the proposed protocol can be used in any scenario by simple parameter tuning. We use computer simulations to evaluate the performance of the proposed protocol.
International conference proceedings, English - Learning route from beaconing and interest dissemination in vehicular sensor networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Proceedings of 2011 6th International Conference on Telecommunication Systems, Services, and Applications, TSSA 2011, 49-54, 2011, Peer-reviwed, Vehicular sensor networks can be used to collect information for the purpose of driving assistance, environment monitoring and entertainment. However, due to the vehicle movement and lossy feature of wireless channel, providing a reliable multi-hop communication between a sensor node and a sink node is particularly challenging. In this paper, we propose a protocol which learns the optimal route in the exchange of hello messages and interest messages. The proposed protocol uses a fuzzy logic to evaluate a direct wireless link and uses a Q-learning algorithm to learn the best route from a multi-hop perspective. We use computer simulations to show the effectiveness of the proposed protocol. © 2011 IEEE.
International conference proceedings, English - A broadcast path diversity mechanism for delay sensitive VANET safety applications
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IEEE Vehicular Networking Conference, VNC, 171-176, 2011, Peer-reviwed, Reliable multi-hop broadcast protocols for vehicular ad hoc networks have been widely discussed recently. However, most of them use acknowledgement based retransmissions to provide reliability. The retransmission method incurs delays when a packet loss cannot be detected on time. Acknowledgement messages also increase the MAC layer contention time at each node. In this paper, we propose a mechanism to use path diversity to provide the reliability. In the proposed mechanism, a message is disseminated by two different paths. By cooperation of these two paths, broadcast messages can be disseminated with a short delay and a high reliability compared with acknowledgement based retransmission approach. The proposed mechanism does not use any explicit acknowledgement message. We evaluate the proposed mechanism using both theoretical analysis and computer simulations. © 2011 IEEE.
International conference proceedings, English - OFA: Opportunistic forwarding and acknowledgement for vehicular ad hoc networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
IB2COM 2011 - 6th International Conference on Broadband Communications and Biomedical Applications, Program, 213-218, 2011, Peer-reviwed, In vehicular ad hoc networks (VANETs), providing a multi-hop communication is challenging due to the vehicle movement and lossy feature of wireless channel. Opportunistic routing provides an alternative solution with its utilization of the broadcast nature of wireless communication and the diversity of packet reception. However, most of opportunistic routing protocols specify the forwarding nodes at the sender side and therefore the opportunism cannot be fully utilized. Moreover, existing opportunistic routing protocols cannot provide a high reliability because of the lack of efficient packet reception check mechanism. In this paper, we propose OFA, an opportunistic forwarding and acknowledgement protocol for vehicular ad hoc networks. OFA performs both data forwarding and acknowledgement by taking advantage of multiuser diversity and route opportunism. In OFA, the forwarder node selection occurs at receiver nodes. An intermediate node is selected opportunistically to acknowledge the sender on the behalf the forwarder node when the forwarder node cannot communicate with the sender node directly. The proposed protocol can fully utilize the path diversity and also can provide hop-by-hop reliability. © 2011 IEEE.
International conference proceedings, English - Distributed Reinforcement Learning Approach for Vehicular Ad Hoc Networks
Celimuge Wu; Kazuya Kumekawa; Toshihiko Kato
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E93B, 6, 1431-1442, Jun. 2010, Peer-reviwed, In Vehicular Ad hoc Networks (VANETs), general purpose ad hoc routing protocols such as AODV cannot work efficiently due to the frequent changes in network topology caused by vehicle movement. This paper proposes a VANET routing protocol QLAODV (Q-Learning AODV) which suits unicast applications in high mobility scenarios. QLAODV is a distributed reinforcement learning routing protocol, which uses a Q-Learning algorithm to infer network state information and uses unicast control packets to check the path availability in a real time manner in order to allow Q-Learning to work efficiently in a highly dynamic network environment. QLAODV is favored by its dynamic route change mechanism, which makes it capable of reacting quickly to network topology changes. We present an analysis of the performance of QLAODV by simulation using different mobility models. The simulation results show that QLAODV can efficiently handle unicast applications in VANETs.
Scientific journal, English - A Novel Multi-hop Broadcast Protocol for Vehicular Safety Applications
Celimuge Wu; Kazuya Kumekawa; Toshihiko Kato
Journal of Information Processing, 情報処理学会, 51, 3, 930-944, Mar. 2010, Peer-reviwed
Scientific journal, English - A Novel Multi-hop Broadcast Protocol for Vehicular Safety Applications
Wu Celimuge; Kumekawa Kazuya; Kato Toshihiko
Information and Media Technologies, Information and Media Technologies Editorial Board, 5, 2, 798-812, 2010, Many safety applications in Vehicular Ad hoc Networks (VANETs) are based on broadcast. Designing a broadcast protocol that satisfies VANET applications' requirements is very crucial. In this paper, we propose a reliable and efficient multi-hop broadcast routing protocol for VANETs. The proposed protocol provides the strict reliability in various traffic conditions. This protocol also performs low overhead by means of reducing rebroadcast redundancy in a high-density network environment. We also propose an enhanced multipoint relay (MPR) selection algorithm that considers vehicles' mobility and then use it for relay node selection. We show the performance analysis of the proposed protocol by simulation with ns-2 in different conditions, and give the simulation results demonstrating effectiveness of the proposed protocol compared with other VANET broadcast schemes.
English - Fuzzy logic based multi-hop broadcast for high-density vehicular ad hoc networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
2010 IEEE Vehicular Networking Conference, VNC 2010, 17-24, 2010, Peer-reviwed, Vehicular ad hoc networks have been attracting the interest of both academic and industrial communities on account of their potential role in Intelligent Transportation Systems (ITS). In vehicular ad hoc networks, vehicles are usually located quite densely within the range of radio transmission. In this paper, we propose a fuzzy logic based multi-hop broadcast protocol for information dissemination in high-density vehicular ad hoc networks. The proposed protocol exhibits low message overheads by means of using only a subset of neighbor nodes to relay messages. In the relay node selection, the proposed protocol jointly considers multiple metrics of inter-vehicle distance, node mobility and signal strength by employing the fuzzy logic. We use computer simulations to evaluate the performance of the proposed protocol. © 2010 IEEE.
International conference proceedings, English - Movement Aware Routing for VANETs
Celimuge Wu; Toshihiko Kato
The 21st IASTED International Conference on Parallel and Distributed Computing and Systems, 315-320, Nov. 2009, Peer-reviwed
International conference proceedings, English - A MANET protocol considering link stability and bandwidth efficiency
Celimuge Wu; Kazuya Kumekawa; Toshihiko Kato
2009 International Conference on Ultra Modern Telecommunications and Workshops, 1-8, 2009, Peer-reviwed, A mobile ad hoc network (MANET) is an autonomous collection of mobile nodes that communicate over relatively bandwidth constrained wireless links. Frequent link changes and limited bandwidth make communication in MANET particularly challenging. Based on AODV, we propose a MANET routing protocol considering link stability and bandwidth efficiency. The protocol uses distributed Q-Learning to infer network status information and takes in to consideration link stability and bandwidth efficiency while selecting a route. The protocol can efficiently handle network mobility by a way of preemptively switching to a better route before current route fails. We study the performance of this protocol through simulation and demonstrate its significant improvement compared to AODV. ©2009 IEEE.
International conference proceedings, English - An Enhanced Reinforcement Routing Protocol for Inter-vehicular Unicast Application
Celimuge Wu; Toshihiko Kato
IASTED International Conference on Internet and Multimedia Systems and Applications, 170-175, Mar. 2008, Peer-reviwed
International conference proceedings, English
MISC
- Performance Analysis of On-device Hierarchical Federated Learning Frameworks
DU Zhaoyang; WU Celimuge; YOSHINAGA Tsutomu
Aug. 2023, 電子情報通信学会技術研究報告(Web), 123, 174(CQ2023 26-36), English, Others, 2432-6380, 202302231592195804 - Semantic Communication with Masked Autoencoders: Enhancing Efficiency in Image Transmission
WU Jiale; DU Zhaoyang; WU Celimuge; YOSHINAGA Tsutomu
Aug. 2023, 電子情報通信学会技術研究報告(Web), 123, 174(CQ2023 26-36), English, Others, 2432-6380, 202302286133140217 - Enhancing Communication Efficiency for UAV Networks through Knowledge Distillation and Transfer Learning in Federated Learning
LI Yalong; DU Zhaoyang; WU Celimuge; YOSHINAGA Tsutomu
Aug. 2023, 電子情報通信学会技術研究報告(Web), 123, 174(CQ2023 26-36), English, Others, 2432-6380, 202302286796191909 - VM Migration Control that Assures and Maximizes Quality in Multi-stage Information Processing Systems
中根和俊; 福島行信; WU Celimuge; JI Yusheng; 村瀬勉
Jul. 2023, 電子情報通信学会技術研究報告(Web), 123, 148(IN2023 17-27), 2432-6380, 202302289105350399 - Meta-networking: Overcoming the Shannon Limit by Empowering Information Density with Multi-faceted Awareness
WU Celimuge
Lead, May 2023, 電子情報通信学会技術研究報告(Web), 123, 51(IN2023 1-16), English, Invited, 2432-6380, 202302232417673582 - Intelligent Vehicular IoT Systems with Collaborative Edge Computing and Federated Learning
WU Celimuge
Lead, Apr. 2023, 電子情報通信学会技術研究報告(Web), 123, 2(NS2023 1-9), English, Invited, 2432-6380, 202302254595266912 - Automated Driving Methods Using Federated Learning
小野航輝; WU Celimuge; 吉永努
Mar. 2023, 電子情報通信学会技術研究報告(Web), 122, 438(CQ2022 80-106), 2432-6380, 202302230675097693 - Task offloading and scheduling with edge-peer computing in multi-stage Information processing system to improve progress of computing process
浅尾英寿; 福島行信; WU Celimuge; JI Yusheng; 村瀬勉
Mar. 2023, 電子情報通信学会技術研究報告(Web), 122, 407(IN2022 65-125), 2432-6380, 202302258493572020 - A copyright management system using blockchain and edge computing
TAN Zhe; WU Celimuge
Mar. 2023, 電子情報通信学会技術研究報告(Web), 122, 438(CQ2022 80-106), 2432-6380, 202302271946083186 - Effectiveness of Multi-Hop D2D Communication in Mobile Cooperative Cache
宮原雅司; 秋場大暉; 萩原賢; WU Celimuge; 吉永努
Mar. 2023, 電子情報通信学会技術研究報告(Web), 122, 451(CPSY2022 34-55), 2432-6380, 202302228620977562 - Prospective Preparation of VM Migration for Accuracy Improvement at server nodes in Multi-Stage Information Processing System
中根和俊; 福島行信; WU Celimuge; JI Yusheng; 村瀬勉
Feb. 2023, 電子情報通信学会技術研究報告(Web), 122, 407(IN2022 65-125), 2432-6380, 202302229272711122 - A Prototype Implementation of Color-based Cooperative Cache with Chunking Contents Delivery
中島 拓真; 岡田 浩希; 策力木格; 吉永 努
電子情報通信学会, 19 Nov. 2017, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 314, 9-14, Japanese, 0913-5685, 40021402258, AN10013141 - Color-based Distributed and Cooperative Cache Control using Prediction of Access Change
千田 進; 城間 隆行; 中島 拓真; 策力 木格; 吉永 努
電子情報通信学会, 26 Jul. 2017, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 117, 153, 51-56, Japanese, 0913-5685, 40021284609, AN10013141 - A Reinforcement Learning-based Data Storage Scheme for VANETs (コミュニケーションクオリティ)
WU Celimuge; YOSHINAGA Tsutomu; JI Yusheng
電子情報通信学会, 19 Jan. 2017, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 116, 403, 13-18, English, 0913-5685, 40021102013, AN1054106X - Distributed Handshake-Join Processing for Stream Data on Multiple FPGA Nodes
Kousuke Tada; Naoto Kawahara; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
本研究報告では，ストリームデータの結合処理を行うHandshake Join のFPGA アクセラレータをマルチノードに拡張する手法を提案し，その性能評価を報告する．マルチノード拡張は，データ通信の2 つの工夫によって実現する．FPGA 上に複数のJoin Core を実装すると共に，FPGA ボード上のDRAM を介してFPGA 間でJoin Coreを接続する仕組みを導入する．また，データ通信と結合演算をオーバラップすることで，通信に要するオーバヘッドを隠蔽する．これらのデータ配布方法の工夫により，単一のFPGA では実装できなかった大きなウインドウサイズの結合演算が可能となる．最大16 ノードでの性能評価の結果，マルチノードに拡張した場合においても，結合演算のスループットが維持されるとともに，並列化効果が得られることが確認された．, 電子情報通信学会, Jan. 2017, 信学技報, 116, 416, 37-42, Japanese, 0913-5685, 120006315700 - An Automatic Disaster Recovery Scheme for Inter-cloud Environment
溝田 敦也; 城間 隆行; 中島 拓真; 吉見 真聡; 策力木格; 吉永 努
電子情報通信学会, 08 Aug. 2016, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 116, 177, 229-234, Japanese, 0913-5685, 40020932405, AN10013141 - Hierarchical Cache Strategies for VOD Networks with Popularity Change
中島 拓真; 城間 隆行; 吉見 真聡; 策力木格; 吉永 努
電子情報通信学会, 24 Mar. 2016, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 518, 247-252, Japanese, 0913-5685, 40020791009, AN10013141 - Design and Evaluation of Low-Latency Handshake Join on FPGA (コンピュータシステム) -- (組込み技術とネットワークに関するワークショップETNET2016)
YOSHIMI Masato; OGE Yasin; WU Celimuge; YOSHINAGA Tsutomu
電子情報通信学会, 24 Mar. 2016, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 518, 253-258, English, 0913-5685, 40020791018, AN10013141 - BS-3-13 Analyzing the Traffic Correlation-Based Attacks on Tor(BS-3. Advanced Networking Technologies for Innovative Information Networks)
Kale Timothy Girry; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 01 Mar. 2016, Proceedings of the IEICE General Conference, 2016, 2, "S-36"-"S-37", English, 110010038480, AN10471452 - B-11-23 Storing data in VANETs
Wu Celimuge; Yoshinaga Tsutomu; Ji Yusheng; Murase Tutomu
The Institute of Electronics, Information and Communication Engineers, 01 Mar. 2016, Proceedings of the IEICE General Conference, 2016, 2, 403-403, English, 110010038284, AN10471452 - Performance comparison between a hybrid DCF/TDMA QoS scheme and the pure TDMA approach (コミュニケーションクオリティ)
Lin Jing; WU Celimuge; OHZAHATA Satoshi
電子情報通信学会, 21 Jan. 2016, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 408, 13-18, English, 0913-5685, 40020737141, AN1054106X - Experimental analysis on performance anomaly at TCP download data transfer in IEEE802.11n wireless LAN
橋本 善季; 野元 祐孝; 策力木格
電子情報通信学会, 26 Nov. 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 327, 49-54, Japanese, 0913-5685, 40020676553, AN1054106X - Improving Traffic Load Distribution for Tor Network (情報ネットワーク)
Kale Timothy Girry; Ohzahata Satoshi; Wu Celimuge
電子情報通信学会, 15 Oct. 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 252, 29-34, English, 0913-5685, 40020651042, AN10013072 - Improving bufferbloat problem of TCP communication by MAC transmission limitation at IEEE 802.11n access point
野元 祐孝; 策力木格; 大坐畠 智
電子情報通信学会, 01 Sep. 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 206, 113-118, Japanese, 0913-5685, 40020617271, AN1054106X - Experimental analysis on performance anomaly at download data transfer in IEEE802.11n wireless LAN
橋本 善季; 野元 祐孝; 策力木格
電子情報通信学会, 01 Sep. 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 206, 149-154, Japanese, 0913-5685, 40020617419, AN1054106X - BS-6-18 Improving Tor Performance with Dynamic Circuit Switching(BS-6.Network and service Design, Control and Management)
Kale Timothy Girry; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 25 Aug. 2015, Proceedings of the Society Conference of IEICE, 2015, 2, "S-50"-"S-51", English, 110009984256, AN10489017 - BS-6-15 Improving Computation Capability of Vehicles with Autonomous Cloud Computing Framework(BS-6.Network and service Design, Control and Management)
Feng Jingyun; Liu Zhi; Wu Celimuge; Ji Yusheng
Cloud computing has been proved that it can reduce hardware cost and improve performance in Internet environment. There are some attempts in building cloud computing frameworks in vehicular environment. However, most frameworks proposed by now are centralized, which means they rely on the deployment of infrastructures which are not quite common right now. In this paper, we present a new framework for vehicular cloud computing. In this framework, we utilize the idle resource of vehicles on the road to provide cheap and neighbor services to each other. We also present an distributed and autonomous routing protocol for the service requests, with overhearing technique and forwarder selecting metric, aiming at reducing flooding packets on the network and balancing the workload. The simulation results show that this framework does reduce the average processing time of tasks., The Institute of Electronics, Information and Communication Engineers, 25 Aug. 2015, Proceedings of the Society Conference of IEICE, 2015, 2, "S-44"-"S-45", English, 110009984253, AN10489017 - B-18-6 Providing collision-free access for QoS flows in ad hoc networks
Lin Jing; Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 25 Aug. 2015, Proceedings of the Society Conference of IEICE, 2015, 2, 340-340, English, 110009984188, AN10489017 - An Efficient Time Slot Allocation Scheme for QoS flows in Ad Hoc Networks (スマートファシリティ研究会・スマートグリッド、スマートシティ/スマートコミュニティに関する技術動向)
Lin Jing; Wu Celimuge; Ohzahata Satoshi
電気学会, 18 Jun. 2015, 電気学会研究会資料. SMF = The papers of Technical Meeting on Smart Facilities, IEE Japan, 2015, 6, 31-36, English, 40020650898, AA1267322X - An Efficient Time Slot Allocation Scheme for QoS flows in Ad Hoc Networks (情報ネットワーク)
Lin Jing; Wu Celimuge; Ohzahata Satoshi
電子情報通信学会, 18 Jun. 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 95, 43-48, English, 0913-5685, 40020523163, AN10013072 - Inter-vehicle Communications : Research Challenges & Opportunities (無線通信システム) -- (特集セッション 将来無線通信に適した無線アクセス及びネットワーク技術)
WU Celimuge; OHZAHATA Satoshi; JI Yusheng
電子情報通信学会, 21 May 2015, 電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115, 43, 21-26, English, 0913-5685, 40020491821, AN10060822 - BS-3-7 Improving Tor Network Throughput by the Circuit Switching(BS-3. Advanced Technologies in the Design, Management and Control for Future Innovative Communication Network)
Girry Kale Timothy; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 24 Feb. 2015, Proceedings of the IEICE General Conference, 2015, 2, "S-22"-"S-23", English, 110009928708, AN10471452 - B-11-19 Multihop Ad-hoc Networking for Smart Garage : Experiment and Results
An Ruijian; Wu Celimuge; Yu Dong; Ji Yusheng; Ohzahata Satoshi; Kato Toshihiko
In this paper, we introduce a communication system for Smart Garage. The system connects the intelligent vehicles to the local server with multi-hop ad-hoc communication. The throughput of the ad-hoc communication is evaluated by the real-world experiments conducted both in the indoor environment and in the SUPER GT 2014 contests., The Institute of Electronics, Information and Communication Engineers, 24 Feb. 2015, Proceedings of the IEICE General Conference, 2015, 2, 436-436, English, 110009928632, AN10471452 - Cloud on the road : an autonomic computing framework in vehicular environment
FENG Jingyun; WU Celimuge; JI Yusheng
With the new DSRC standard for vehicular networks, more network depending services are possible in vehicular environment. Cloud computing is one of those services that can boost the information processing performance of vehicles without raising the cost on hardware, and support various other services in vehicular environment. There are already some attempts in building cloud computing frameworks in vehicular environment. However, most frameworks proposed by now are centralized, which means they rely on the deployment of infrastructures not quite common right now. In this paper, we present a new framework for vehicular cloud computing. In this framework, we utilize the idle resource of vehicles on the road to provide cheap and neighbor service to each other. We also present an distributed and autonomous routing algorithm for the service requests, with overhearing technique and forwarder selecting metric, aiming at reducing flooding packets on the network and balance the workload., The Institute of Electronics, Information and Communication Engineers, 22 Jan. 2015, Technical report of IEICE. CQ, 114, 404, 13-18, English, 0913-5685, 110010002158, AN1054106X - Common Service Platform for Electric Vehicles
WEI Jing; LI Jinglin; LIU Zhihan; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
We propose a common service platform for electric vehicles (EVs). The platform is supposed to make use of information of EVs, EVs users, traffic flow, map and charging network to provide common service such as GIS service, resource management service, billing service, and open API service for EVs users, charging service operators and service developers. We divide the platform into three layers, which are resource layer, capability layer and service layer. Resource layer is to store data, and provide data access interface to capability layer. Capability layer encapsulates some common function, and provides the function to service layer. Meanwhile, capability layer will authorize and authenticate the invoking services. Service layer provides common service for platform users. Service developers can use open API of capability layer to organize new customized service. We describe our demo implementation of the proposed platform framework., The Institute of Electronics, Information and Communication Engineers, 22 Jan. 2015, Technical report of IEICE. CQ, 114, 404, 1-6, English, 0913-5685, 110010002156, AN1054106X - Consideration on iOS TCP Performance Problem at Busty Packet Losses
Wang Weikai; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Recently, packet losses can be caused by transmission interruptions such as handoffs in the mobile networks and protection switching in the transport networks. These packet losses are bursty because the transmission interruptions continue for tens of miliseconds through several seconds. Previously, we performed the experimental analysis for various TCP versions running on Linux and MAC OS, and found that, although TCPs in Linux recover from bursty losses quickly, TCP in OS X shows an intermittent data transfer during the timeout retransmission invoked by bursty losses, which takes several seconds for retransmitting all of the lost packets. In this paper, we give detailed results of experimental analysis. Based on this analysis, we clarify the reason for the intermittent data transfer in MAC OS X by taking account of newly introduced TCP procedures, such as F-RTO and Early Retransmit., The Institute of Electronics, Information and Communication Engineers, 22 Jan. 2015, Technical report of IEICE. CQ, 114, 404, 19-24, English, 0913-5685, 110010002159, AN1054106X - A Routing Protocol for Drive-thru Internet Access in Delay Tolerant Vehicular Ad Hoc Networks
OHYA Yoshimasa; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
We propose a routing protocol for drive-thru Internet access in delay tolerant vehicular networks. The contribution of this paper is two-folds. First, we propose a new approach which utilizes the concept of delay tolerant network (DTN) to supplement the conventional communication approach. Second, we propose an algorithm to schedule DTN transmissions in order to maximize the system throughput. The proposed protocol is able to attain higher TCP throughput than the conventional approach by providing more efficient wireless resource utilization. We use computer simulations to evaluate the proposed protocol., The Institute of Electronics, Information and Communication Engineers, 22 Jan. 2015, Technical report of IEICE. CQ, 114, 404, 85-89, English, 0913-5685, 110010002171, AN1054106X - Performance Evaluation of Qos Supporting Ad Hoc Scheme Combining TDMA and 802.11 DCF
Lin Jing; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
We present performance evaluation results of a QoS supporting ad hoc network protocol which employs a hybrid approach utilizing both TDMA and 802.11 DCF. In the protocol, TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. TDMA time slots are assigned on admission basis in a distributed manner by utilizing network routing information and considering current assignment situation. In DCF period, frames are transmitted without disturbing the TDMA period. We evaluate the protocol for various numbers of best effort flows with QualNet simulator. Simulation results show that the protocol is able to provide an efficient solution for QoS control in ad hoc networks by combing TDMA and 802.11 DCF., The Institute of Electronics, Information and Communication Engineers, 22 Jan. 2015, Technical report of IEICE. CQ, 114, 404, 35-40, English, 0913-5685, 110010002162, AN1054106X - A Design of Circuit Switching Method for Reducing Congestion in the Tor Network
Girry Kale Timothy; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Tor network is a distributed circuit-switching overlay network, and consists of voluntarily run onion routers around the world. Tor is vulnerable to network congestion and performance problems, due to circuit traffics with different rates are competing to transfer their data on a single TCP connection. A large fraction of available network capacity is consumed by the bulk users' traffic, resulting in increasing delays for the light interactive users. The unfair distribution of circuit traffic makes a bottleneck in Tor output buffer. We apply the circuit switching method and make the OR to construct a multiple TCP connections to improve the traffic flow rate and reduce the congestion in the Tor network. This approach increase the OR capacity and fairly distributing the multiple traffics that are competing to send data. The proposed method was evaluated on our setup ORs that are online in the Tor network. The experimental results show that TCP socket buffers and Tor network capacity are utilized and circuit congestion is reduced., The Institute of Electronics, Information and Communication Engineers, 16 Oct. 2014, IEICE technical report, 114, 252, 87-92, English, 0913-5685, 110009958945, AA11546431 - Characterization of TCP Congestion Control Algorithm by Estimating Congestion Window : Increase Relation and Decrease Parameter
Oda Atsushi; Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
Recently, according to the diversification of network environments, a lot of TCP congestion control mechanisms have been introduced. Since the congestion control algorithms affect the performance of the Internet, it is important to analyze which algorithms are used widely. This paper proposes a passive scheme to characterize individual congestion control algorithms by (1) estimating congestion window at round-trip time intervals, (2) correlating window sizes and their increases, and (3) identifying the discrete coefficient of congestion window. Our scheme aims at dealing with many of recent proposed congestion control algorithms including TCP Vegas, TCP Veno, Cubic TCP and TCP Illinois., The Institute of Electronics, Information and Communication Engineers, 11 Sep. 2014, Technical report of IEICE. CQ, 114, 209, 171-176, Japanese, 0913-5685, 110009950367, AN1054106X - B-11-10 A Multi-hop Broadcast Protocol for WAVE Multi-channel Single-radio Vehicular Networks
Wu Celimuge; Ohzahata Satoshi; Ji Yusheng; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 09 Sep. 2014, Proceedings of the Society Conference of IEICE, 2014, 2, 241-241, English, 110009883573, AN10489017 - BS-6-19 Measuring output buffer utilization for Interactive Users in Tor(BS-6.Network and service Design, Control and Management)
KALE Timothy Girry; OHZAHATA Satoshi; CELIMUGE Wu; KATO Toshihiko
The Institute of Electronics, Information and Communication Engineers, 09 Sep. 2014, Proceedings of the Society Conference of IEICE, 2014, 2, "S-72"-"S-73", English, 110009883792, AN10489017 - A Study on QoS Support in Ad Hoc Networks Using TDMA and 802.11 DCF
Lin Jing; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
We propose a QoS supporting ad hoc network protocol, which employs a hybrid approach utilizing both TDMA and 802.11 DCF. TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. TDMA time slots are assigned on admission basis in a distributed manner by utilizing network routing information and considering current assignment situation. In DCF period, frames are transmitted not to disturb the TDMA period. By combing TDMA and 802.11 DCF, the proposed ad hoc network is able to provide an efficient solution for QoS control in ad hoc networks. We use QualNet simulator to evaluate the proposed scheme., The Institute of Electronics, Information and Communication Engineers, 10 Jul. 2014, Technical report of IEICE. CQ, 114, 131, 25-30, English, 0913-5685, 110009942500, AN1054106X - BS-1-15 Towards Improving Congestion Control in Tor(BS-1. Future Network Technologies for Advanced Information and Communications Society)
Girry Kale Timothy; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 04 Mar. 2014, Proceedings of the IEICE General Conference, 2014, 2, "S-29", English, 110009850012, AN10471452 - B-11-18 A Cross Layer Approach for Multi-hop Broadcasting in VANETs with Reserved Time Slots
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 04 Mar. 2014, Proceedings of the IEICE General Conference, 2014, 2, 466-466, English, 110009850368, AN10471452 - Behavior Analysis of Different TCP Implementations under Burst Error Environment
Wang Weikai; KATO Toshihiko; WU Celimuge; OHZAHATA Satoshi
Currently, large amount of data are transferred through the Internet. TCP plays an important role in this data transfer for the reliable data delivery. On the other hand, recent transmission technologies and media access control technologies realize high quality of data transmission in both backbone transport networks and mobile telecommunication networks. Therefore, packet losses detected in TCP level are considered as an indication of network congestion. However, packet losses can be caused by transmission interruptions such as handoffs in the mobile networks and protection switching in the transport networks. These packet losses are bursty because the transmission interruptions continue for tens of mili seconds through several seconds. This paper describes the results of experimental analysis of various TCP versions, several TCP versions in the Linux, that in Mac OS, against bursty packet losses. The result for Mac OS has some problem in retransmitting contiguously lost packets. This paper shows a detailed packet level analysis of TCP behaviors and points out that the key is the retransmission invoked by TCP SACK option., The Institute of Electronics, Information and Communication Engineers, 24 Jan. 2014, Technical report of IEICE. CQ, 113, 405, 17-22, English, 0913-5685, 110009822172, AN1054106X - An Evaluation of Node-Based Delays in the Tor Network
Girry Kale Timothy; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
The Tor Network is a low-latency anonymity and censorship resistance network, which relaying traffics through onion routers before being forwarded to the destination. The distribution of trust offered by Tor creates resilience in the face of compromise and censorship; however, there are performance and usability issues in the Tor network. In this paper, we analyze in more details the delay contributions from different components that cause delays in the Tor nodes. We measured the application packet that passes through all the relay nodes and closely compute the sources of latency. The experimental analysis shows that the delays occurring on relay nodes are caused by the heavy circuit queuing, TCP kernel memory exhaustion and TCP advertised window not able to accept more data. We present our experimental detail analysis and measurement results as a prerequisite for addressing the Tor's poor performance and usability., The Institute of Electronics, Information and Communication Engineers, 23 Jan. 2014, IEICE technical report. Information networks, 113, 389, 121-126, English, 0913-5685, 110009825115, AN10013072 - The Effect of Node-Based Delays on Tor Performance
Girry Kale Timothy; Ohzahata Satoshi; Wu Celimuge; Kato Toshihiko
Tor is an anonymous network that provides privacy and anonymity to users all over the world, by relaying traffics through the three onion routers before being forwarded to the destination. In this paper, we show that Tor suffers from the performance issues, because bandwidth is limited to how much a user is willing to allocate for Tor's usage. This scenario frequently leads to increasing delays that are not tolerated by the average end-users. We discuss these delays in more detail and perform the comprehensive study to evaluate the relative contributions for delays in the node. We use a simple model to analyze the delay components that contribute to degrade the Tor performance, due to poor TCP congestion control and high traffic queuing in the buffers. We evaluate our proposed mathematical models and present our experimental results as a prerequisite for addressing the Tor's poor delay performance., The Institute of Electronics, Information and Communication Engineers, 17 Oct. 2013, IEICE technical report, 113, 244, 111-116, English, 0913-5685, 110009783040, AA11546431 - Improving VANET unicast routing protocols by using network coding and cooperative relays
WU Celimuge; OHZAHATA Satoshi; JI Yusheng; KATO Toshihiko
We present a scheme for VANET routing protocols. The scheme uses multiple forwarder nodes to forward data and uses network coding to reduce the number of required transmissions, resulting in a significant improvement in end-to-end packet delivery ratio with low message overhead. The scheme can be used with any VANET routing protocols by simple modification. The effectiveness of the scheme is evaluated by using both theoretical analysis and computer simulations., The Institute of Electronics, Information and Communication Engineers, 17 Oct. 2013, IEICE technical report. Information networks, 113, 245, 13-18, English, 0913-5685, 110009818863, AN10013072 - Improvement of TCP Delay Performance at Large Rate Change in IEEE 802.11n Wireless LANs
NOMOTO Masataka; KATO Toshihiko; WU Celimuge; OZAHATA Satoshi
IEEE 802.11n wireless LANs provide high-speed data transfer. If the radio condition becomes bad, however, the transfer rate will be reduced significantly and there will be some problems in the data transfer. So, we have evaluated the performance of IEEE 802.11n LAN by changing the distance between the access point and a station. As a result, a severe increase of round-trip time was measured in the case of low transfer rate. A reason for this increased round-trip delay will be powerful retransmission function of 802.11n. So, we propose a method to improve TCP delay performance by reducing this retransmission capability and by generating TCP segment loss intentionally., The Institute of Electronics, Information and Communication Engineers, 12 Sep. 2013, Technical report of IEICE. CQ, 113, 208, 75-80, Japanese, 0913-5685, 110009814864, AN1054106X - BS-7-10 A Backbone-based Multi-hop Broadcast Protocol for VANETs
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 03 Sep. 2013, Proceedings of the Society Conference of IEICE, 2013, 2, "S-51"-"S-52", English, 110009730227, AN10489017 - A Fuzzy Inference Intelligent Routing Protocol for Vehicular Ad Hoc Networks
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Due to vehicle movement, limited wireless resources and lossy feature of wireless channels, providing a reliable multi-hop communication in VANETs is particularly challenging. We present a VANET routing protocol which learns the optimal route by employing a fuzzy constraint Q-Learning algorithm. The protocol uses fuzzy logic to evaluate a wireless link is whether good or not by considering multiple metrics of signal strength, available bandwidth and relative vehicle movement. Based on the evaluation of each wireless link, the protocol learns the best route using the route request messages and hello messages. The protocol can achieve high packet delivery ratio and low end-to-end delay. We show the effectiveness of the protocol by using computer simulations., The Institute of Electronics, Information and Communication Engineers, 17 Jul. 2013, IEICE technical report. ASN, Ambient intelligence and sensor networks, 113, 132, 201-206, English, 0913-5685, 110009778122, AA12618979 - An Implementation-friendly Broadcast Protocol for VANETs Utilizing Neighbor Information
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
We present BR-NB (broadcast with neighbor information), a fuzzy logic based multi-hop broadcast protocol for VANETs. BR-NB achieves a low overhead by using only a subset of neighbor nodes to relay data packets. For the relay node selection, BR-NB takes account of the inter-vehicle distance, vehicle mobility and link quality by employing fuzzy logic. The expected coverage and vehicle mobility are inferred from the two-hop neighbor information which can be acquired from the hello message exchange. Since it is independent of lower layers and does not require GPS, BR-NB provides an implementation-friendly solution for broadcasting in VANETs. We use computer simulations and real-world experiments to evaluate the performance of BR-NB., The Institute of Electronics, Information and Communication Engineers, 11 Jul. 2013, Technical report of IEICE. CQ, 113, 123, 7-12, English, 0913-5685, 110009773226, AN1054106X - A MAC protocol to improve QoS in VANETs using contention window adjustment
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Packet delivery ratio and end-to-end delay are the two most important QoS (Quality of Service) metrics. In this paper, we propose a MAC layer protocol which can provide a high packet delivery ratio and low end-to-end delay for various scenarios. The proposed protocol uses a Q-Learning algorithm to tune the contention window size in order to provide an efficient channel access scheme for various network situations. We show the effectiveness of the proposed protocol by using computer simulations., The Institute of Electronics, Information and Communication Engineers, 18 Apr. 2013, Technical report of IEICE. CQ, 113, 7, 65-70, English, 0913-5685, 110009769138, AN1054106X - B-6-59 An Implementation-friendly Multi-hop Broadcast Protocol for VANETs
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 05 Mar. 2013, Proceedings of the IEICE General Conference, 2013, 2, 59-59, English, 110009760983, AN10471452 - Improving OLSR for highly mobile and lossy networks
DASHBYAMBA Narangerel; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Optimized Link State Routing Protocol (OLSR) is a well-known proactive, routing protocol for mobile ad hoc networks. OLSR reduces the number of control messages by using MPRs to forward topology control messages as compared with typical proactive protocols. Since OLSR does not consider the node mobility and signal strength condition in the MPR selection, OLSR cannot work well in a highly mobile and lossy network. In this paper, we propose a protocol to improve OLSR by considering the node mobility and signal strength in the route selection. We use network simulator to evaluate the proposed protocol's performance., The Institute of Electronics, Information and Communication Engineers, 08 Nov. 2012, Technical report of IEICE. CQ, 112, 288, 47-52, English, 0913-5685, 110009642101, AN1054106X - Fuzzy logic based MPR selection for OLSR
DASHBYAMBA N.; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Optimized Link State Routing Protocol(OLSR) provides a low control overhead in high-density networks by using only MPRs to forward topology control messages. Since signal strength and mobility i \ssues are not considered in the MPR selection, OLSR fails to work properly in lossy or mobile wireless networks. In this paper, we propose a fuzzy logic based MPR selection algorithm to improve the performance of OLSR. The proposed protocol selects MPRs by considering inter-node distance, RSSI and node velocity. We use computer simulations to evaluate the proposed protocol., The Institute of Electronics, Information and Communication Engineers, 27 Sep. 2012, IEICE Technical Report, 112, 218, 83-88, English, 0913-5685, 110009666597, AN1054106X - B-6-18 A Redundant Transmission Mechanism for WSNs
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 28 Aug. 2012, Proceedings of the Society Conference of IEICE, 2012, 2, 18-18, English, 110009591655, AN10489017 - Fast and reliable data collection in WSNs with adaptive redundant transmission
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
For many wireless sensor network (WSN) applications, high reliability and low delay are required. The acknowledgement based retransmission mechanism is the most frequently used approach for providing the reliability. However, the retransmission increases the end-to-end delay especially when the number of hops from a sensor to the sink node is large. In this paper, we propose a redundancy-based approach to provide high reliability and low end-to-end delay. Redundant transmissions are used when a link is unreliable or the end-to-end delay requirement is strict. We evaluate the proposed mechanism using a wireless sensor network which consists of IRIS motes., The Institute of Electronics, Information and Communication Engineers, 05 Jul. 2012, Technical report of IEICE. CQ, 112, 119, 95-100, English, 0913-5685, 110009626641, AN1054106X - A VANET routing protocol with full utilization of opportunism
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Opportunistic routing can be a solution for data forwarding in vehicular ad hoc networks (VANETs). However, existing opportunistic protocols specify the forwarding nodes at the sender side and therefore the opportunism cannot be fully utilized. Most opportunistic routing protocols cannot provide a high reliability due to the lack of efficient packet reception check mechanism. In this paper, we present OFA, an opportunistic forwarding and acknowledgement protocol for VANETs. In OFA, the forwarder node selection occurs at receiver nodes. An intermediate node is selected opportunistically to acknowledge the sender on the behalf the forwarder node when the forwarder node cannot communicate with the sender node directly. OFA can fully utilize the path diversity and also can provide hop-by-hop reliability., The Institute of Electronics, Information and Communication Engineers, 12 Apr. 2012, Technical report of IEICE. CQ, 112, 10, 19-24, English, 110009564453, AN1054106X - A PU Aware Route Discovery Approach for Cognitive Ad Hoc Networks (アドホックネットワーク)
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
電子情報通信学会, 12 Mar. 2012, 電子情報通信学会技術研究報告 : 信学技報, 111, 477, 147-152, English, 0913-5685, 40019224950 - B-6-14 A Primary User Aware Routing Protocol for Cognitive CSMA/CA Ad Hoc Networks
Nakato Tatsuaki; Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 06 Mar. 2012, Proceedings of the IEICE General Conference, 2012, 2, 14-14, English, 110009462487, AN10471452 - A PU Aware Route Discovery Approach for Cognitive Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Cognitive ad hoc networks have been attracting interests in recent years. Designing an efficient routing protocol for cognitive ad hoc networks is important for full utilization of free wireless resources. A protocol considering primary user (PU) flows and channel assignment incurred network connectivity issue in the route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog utilizes the availability of multiple channels by considering the effect on the primary users. AODV-cog chooses a route by considering available channel bandwidth and future channel utilization. AODV-cog switches channels for secondary user flows when network congestion is occurred. We use network simulations to show the advantage of AODV-cog over existing alternatives.Cognitive ad hoc networks have been attracting interests in recent years. Designing an efficient routing protocol for cognitive ad hoc networks is important for full utilization of free wireless resources. A protocol considering primary user (PU) flows and channel assignment incurred network connectivity issue in the route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog utilizes the availability of multiple channels by considering the effect on the primary users. AODV-cog chooses a route by considering available channel bandwidth and future channel utilization. AODV-cog switches channels for secondary user flows when network congestion is occurred. We use network simulations to show the advantage of AODV-cog over existing alternatives., 05 Mar. 2012, 研究報告ユビキタスコンピューティングシステム（UBI）, 2012, 9, 1-6, English, 170000069867, AA11838947 - A PU Aware Route Discovery Approach for Cognitive Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Cognitive ad hoc networks have been attracting interests in recent years. Designing an efficient routing protocol for cognitive ad hoc networks is important for full utilization of free wireless resources. A protocol considering primary user (PU) flows and channel assignment incurred network connectivity issue in the route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog utilizes the availability of multiple channels by considering the effect on the primary users. AODV-cog chooses a route by considering available channel bandwidth and future channel utilization. AODV-cog switches channels for secondary user flows when network congestion is occurred. We use network simulations to show the advantage of AODV-cog over existing alternatives.Cognitive ad hoc networks have been attracting interests in recent years. Designing an efficient routing protocol for cognitive ad hoc networks is important for full utilization of free wireless resources. A protocol considering primary user (PU) flows and channel assignment incurred network connectivity issue in the route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog utilizes the availability of multiple channels by considering the effect on the primary users. AODV-cog chooses a route by considering available channel bandwidth and future channel utilization. AODV-cog switches channels for secondary user flows when network congestion is occurred. We use network simulations to show the advantage of AODV-cog over existing alternatives., 05 Mar. 2012, 研究報告モバイルコンピューティングとユビキタス通信（MBL）, 2012, 9, 1-6, English, 170000069825, AA11851388 - Detailed Analysis of iPad2 TCP Behaviours
WANG Weikai; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Nowadays, tablet device such as iPad2 is getting popular as a platform for portable wireless computing and is used in various communication scenarios, such as web browsing and e-mail transmissions. However, iPad2 is newly introduced in the market and it may possibly have some differences form the common notebook computers. So, we analyze the behaviors of iPad2 TCP communication, which works as a basis of various communication applications. In this analysis, we examine the TCP communication in various conditions by introducing transmission errors. We analyze the segment sequences in detail. This paper shows the evaluation results and points out some issues which iPad2 has in its TCP implementation., The Institute of Electronics, Information and Communication Engineers, 26 Jan. 2012, IEICE technical report. Information networks, 111, 409, 95-100, English, 0913-5685, 110009481034, AN10013072 - Joint Retransmission and Relay Node Selection Scheme for Multi-hop Broadcast in VANETs
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Providing a reliable and efficient multi-hop broadcast in vehicular ad hoc networks (VANETs) is crucial for Intelligent Transportation Systems. In order to provide a high reliability, a retransmission mechanism is required because a packet can be lost depending on the wireless link status and vehicle movement. The retransmission can significantly increase the message overhead if the relay nodes are not selected properly. The solution involves a joint consideration of retransmission and relay node selection. In this paper, we present a broadcast scheme which provides a high reliability with a low overhead. The scheme uses a fuzzy logic based approach to select relay nodes and uses a lightweight retransmission mechanism to retransmit a packet when a relay fails. We use computer simulations to evaluate the performance of the scheme and show the simulation results., The Institute of Electronics, Information and Communication Engineers, 03 Nov. 2011, Technical report of IEICE. CQ, 111, 278, 79-84, English, 0913-5685, 110009465887, AN1054106X - A Study on TCP Performance of Android Tablet Devices
WU Celimuge; WANG Weikai; OHZAHATA Satoshi; KATO Toshihiko
Tablet devices are expected to account for a large portion of the Internet traffic in the near future due to their increasing shipments. As an open source platform, Android has been attracting interests from many communities. In this paper, we analyze the performance of TCP communication on Android tablet devices. We examine the TCP behaviors of Android tablet devices in various conditions by using a network emulator. We show the analysis results and point out possible improvements., The Institute of Electronics, Information and Communication Engineers, 01 Sep. 2011, IEICE technical report, 111, 202, 51-56, English, 0913-5685, 110008900628, AN1054106X - BS-6-40 A Lightweight Approach for Reliable Broadcast in VANETs(BS-6. Planning, Control and Management on Networks and Services)
Wu Celimuge; Ohzahata Satoshi; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 30 Aug. 2011, Proceedings of the Society Conference of IEICE, 2011, 2, "S-108"-"S-109", English, 110008725367, AN10489017 - Performance analysis of iPad TCP communications
WANG Weikai; WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Nowadays, a tablet terminal such as iPad is getting popular as a platform of the portable wireless computing and is used in various communication scenarios such as web accesses and e-mail transmissions. However, iPad is newly introduced in the market and it may possibly have some differences from the common wireless terminals such as notebook computers. So, we analyze the performance of iPad TCP communication, which works as a basis of various communication applications. In this analysis, we examine the TCP performance in various conditions by introducing propagation delays and transmission errors. We have analyzed the segment sequences in detail. This paper shows the evaluation results and points out some issues which iPad has in its TCP implementation., The Institute of Electronics, Information and Communication Engineers, 09 Jun. 2011, IEICE technical report, 111, 80, 85-90, English, 0913-5685, 110008746085, AN10013072 - A multi-hop broadcast protocol for driver assistance in high-density environments
WU Celimuge; OHZAHATA Satoshi; KATO Toshihiko
Recently, as a component of Intelligent Transportation Systems (ITS), vehicular ad hoc networks have been rapidly attracting interests for the driver assistance systems. In this paper, we propose a multi-hop broadcast protocol for information dissemination in high-density environments. The proposed protocol redues redundant broadcast messages by means of using only a subset of neighbor nodes to relay messages. In the relay node selection, the proposed protocol considers multiple metrics of inter-vehicle distance, node mobility and signal strength, and integrates them by introducing the fuzzy logic. The effectiveness of the proposed protocol is also evaluated by computer simulations., The Institute of Electronics, Information and Communication Engineers, 02 Sep. 2010, Technical report of IEICE. CQ, 110, 198, 37-42, Japanese, 0913-5685, 110008108069, AN1054106X - A multi-hop broadcast protocol for driver assistance in high-density environments
策力木格; 大坐畠 智; 加藤 聰彦
映像情報メディア学会, Sep. 2010, ITE technical report, 34, 35, 65-70, Japanese, 1342-6893, 40017339510, AN1059086X - B-6-4 ENHANCING AODV ROUTING PROTOCOL USING Q-LEARNING
Wu Celimuge; Kumekawa Kazuya; Kato Toshihiko
The Institute of Electronics, Information and Communication Engineers, 01 Sep. 2009, Proceedings of the Society Conference of IEICE, 2009, 2, 4-4, English, 110007869939, AN10489017
Books and other publications
Lectures, oral presentations, etc.
- Semantic Communication with Masked Autoencoders: Enhancing Efficiency in Image Transmission
Jiale Wu・Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE CQ
31 Aug. 2023
31 Aug. 2023- 02 Sep. 2023 - Performance Analysis of On-device Hierarchical Federated Learning Frameworks
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE CQ
31 Aug. 2023
31 Aug. 2023- 01 Sep. 2023 - Enhancing Communication Efficiency for UAV Networks through Knowledge Distillation and Transfer Learning in Federated Learning
Yalong Li; Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE CQ
30 Aug. 2023
31 Aug. 2023- 01 Sep. 2023 - VM Migration Control that Assures and Maximizes Quality in Multi-stage Information Processing Systems
Kazutoshi Nakane; Yukinobu Fukushima Celimuge Wu; Yusheng Ji; Murase Tutomu
Oral presentation, Japanese, IEICE IN
04 Aug. 2023
03 Aug. 2023- 04 Aug. 2023 - Meta-networking: Overcoming the Shannon Limit by Empowering Information Density with Multi-faceted Awareness
Celimuge Wu
Invited oral presentation, English, IEICE IN, Invited
25 May 2023
25 May 2023- 26 May 2023 - Intelligent Vehicular IoT Systems with Collaborative Edge Computing and Federated Learning
Celimuge Wu
Invited oral presentation, English, IEICE NS, Invited, Peer-reviewed
13 Mar. 2023
13 Apr. 2023- 14 Apr. 2023 - Empowering Federated Learning in Vehicular IoT
Celimuge Wu
Invited oral presentation, English, Technical Committee on Information Networks, Invited, IEICE, International conference
May 2022 - Fuzzy Logic-based Client Selection for Federated Learning in Vehicular IoT
Celimuge Wu
Invited oral presentation, English, Technical Committee on Information and Communication Management, Invited, IEICE, International conference
Mar. 2022 - Toward Efficient Federated Learning for Internet of Vehicles
Celimuge Wu
Invited oral presentation, English, International Conference on Emerging Technologies for Communications, Invited, IEICE, International conference
Dec. 2021 - Federated Learning for Internet of Vehicles
Celimuge Wu
Invited oral presentation, English, 大学ICT推進協議会 高品質・セキュリティICT部会会合「AXIES 高品質・セキュリティICTワークショップ 2021」, Invited, IEICE, International conference
Nov. 2021 - Federated Learning for Vehicular Internet of Things
Celimuge Wu
Keynote oral presentation, English, 10th International Conference on MOBILe Wireless MiddleWARE, Operating Systems, and Applications (EAI MOBILWARE), Invited, IEICE, International conference
Oct. 2021 - A UAV-empowered Routing Protocol for Federated Learning in Delay Tolerant Environments
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Sep. 2021 - Deep Reinforcement Learning Based Mode Selection for Coexistence of D2D-Unlicensed and Wi-Fi
Wang Ganggui; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Sep. 2021 - A Distributed Computation Offloading Strategy for Edge Computing based on Deep Reinforcement Learning
Hongyang Lai; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Sep. 2021 - Load balancing method using reinforcement learning between edge and cloud
Hiroki Kobari; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Sep. 2021 - Computational intelligence meets vehicular edge computing
Celimuge Wu
Invited oral presentation, English, The 22nd Asia-Pacific Network Operations and Management Symposium (APNOMS), Invited, IEICE, International conference
Sep. 2021 - Greenhouse temperature control based on fuzzy logic and image processing
Chuan Lu; Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Sep. 2021 - Vehicular IoT with Collaborative Intelligence
Celimuge Wu
Invited oral presentation, English, IEICE CQ研専設立30周年に向けた特別企画ワークショップ, Invited, IEICE, Domestic conference
Jan. 2021 - Collaborative Intelligence for Internet of Vehicles
Celimuge Wu
Invited oral presentation, English, International Japan-Africa Conference on Electronics, Communications and Computations (JAC-ECC), Invited, IEICE, International conference
Dec. 2020 - FPGAを用いたデータベースクエリ処理の高速化
尾作洋彦; 吉見真聡; 策力木格; 吉永努
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
27 Nov. 2020 - Performance Analysis of D2D-Unlicensed Communications with Mode Selection
Ganggui Wang; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
27 Nov. 2020 - Development of a crop monitoring system using edge computing
Yilong Chen; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
03 Sep. 2020 - Task Offloading of a Distributed and Cooperative Cache Server using FPGA
Yifei Li; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
31 Jul. 2020 - Predicting Vehicle Speed with Convolutional Neural Networks
Yifei Li; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
25 Jun. 2020 - Acceleration of numerical simulation of computational model for research on visual illusion
Yusuke Yanagida; Shunji Satoh; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
04 Mar. 2020 - An efficient traffic reduction scheme for mobile cooperative cache by pushing contents preliminarily
Takayuki Shiroma; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
27 Feb. 2020 - FPGA-based Stream Data Aggregation for Large Sliding-Windows
Masaki Osaka; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
23 Jan. 2020 - Improving multihop communications using hop-by-hop data transfer
Masaya Harada; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
17 Jan. 2020 - Traffic Big Data Assisted V2X Communications
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
24 Oct. 2019 - Big Data Assisted Broadcast in VANETs
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
27 Aug. 2019 - Virtual Edge: A Method to Edge Selection for Task Offloading in VANETs
Narisu Cha; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
27 Aug. 2019 - Empowering Vehicular Networks with Computational Intelligence
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji; Tutomu Murase
Invited oral presentation, English, IEICE Technical Report, Invited, IEICE, Domestic conference
12 Jul. 2019 - A Vehicular DTN Routing Protocol with Enhanced Buffer Management Policy
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
18 Jan. 2019 - Low-Latency Stream Data Join on Multiple FPGA Nodes
Koushi Matsushita; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
31 Jul. 2018 - An efficient content sharing for distributed and collaborative cache networks of mobile devices
akayuki Shiroma; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
27 Jul. 2018 - A Prophet-based DTN protocol for VANETs
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
01 Jun. 2018 - [Invited Talk] Mobile Edge Computing in Vehicular Environment -- Multi-Access Framework and Task Scheduling --
Yusheng Ji; Jingyun Feng; Zhi Liu; Celimuge Wu
Invited oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
31 May 2018 - [Invited Talk] Computational Intelligence for Vehicular Internet of Things
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Invited oral presentation, English, IEICE Technical Report, Invited, IEICE, Domestic conference
May 2018 - VM Migration Management for QoS Optimization in Mobile Edge Computing
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Murase Tutomu
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Mar. 2018 - Evaluation on performance gain of an SDN-based handover approach in IEEE 802.11p and LTE hybrid vehicular networks
Ran Duo; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2018 - An Openflow-based Management Framework for Sensor and Actuator Networks
Rui Kang; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2018 - Efficient Content Delivery in Vehicular Networks with Sub-6 GHz and mmWave
Celimuge Wu; Tsutomu Yoshinaga; Tutomu Murase; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Nov. 2017 - [Poster Presentation] A Light-weight Chunk-based Content Management for Cooperative Cache Network
Hiroki Okada; Takayuki Shiroma; Takuma Nakajima; Celimuge WU; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Nov. 2017 - [Technology Exhibit] A Prototype Implementation of Color-based Cooperative Cache with Chunking Contents Delivery
Takuma Nakajima; Hiroki Okada; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Nov. 2017 - HVC: A Hybrid Cloud Computing Framework in Vehicular Environment
Jingyun Feng; Zhi Liu; Celimuge Wu; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Oct. 2017 - Performance Evaluation of Vehicular DTN Protocols for Anycast Vehicle-to-cloud Communications
Zhaoyang Du; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Aug. 2017 - Enabling high performance handover in IEEE 802.11p and LTE hybrid vehicular networks with SDN and MEC
Ran Duo; Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Aug. 2017 - Color-based Distributed and Cooperative Cache Control using Prediction of Access Change
Susumu Chida; Takayuki Shiroma; Takuma Nakajima; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
19 Jul. 2017 - Content Distribution in VANETs Integrating LTE and IEEE 802.11p
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
May 2017 - Performance Evaluation on Wireless Multi-hop Networks connected to Mobile Edge Computing
Jun Kikuchi; Celimuge Wu; Yusheng Ji; Tutomu Murase
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Mar. 2017 - A Novel Cooperative Caching Scheme based on Device-to-Device Content Sharing
Takayuki Shiroma; Takuma Nakajima; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Mar. 2017 - Vehicular Ad Hoc Networks: Research Opportunities and challenges
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Invited oral presentation, English, IEICE General Conference, Invited, IEICE, Domestic conference
Mar. 2017 - A Reinforcement Learning-based Data Storage Scheme for VANETs
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2017 - Performance evaluation of RPL-based sensor data collection in challenging IoT environment
Liming Gao; Celimuge Wu; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2017 - Vehicular Ad Hoc Networks: Research Opportunities and challenges
Celimuge Wu
Invited oral presentation, English, 大学ICT推進協議会（AXIES）高品質セキュリティICT部会, Invited, 大学ICT推進協議会（AXIES）, Domestic conference
13 Dec. 2016 - Vehicular DTN as an Approach for Post-disaster Communication
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Nov. 2016 - Provision of QoS in ad hoc networks using TDMA and DCF
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, The Second CQ Workshop, IEICE, Domestic conference
Oct. 2016 - A Basic Evaluation of Active Timing Correlation Attacks on Tor
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Society Conference, IEICE, Domestic conference
Sep. 2016 - Ant Colony Optimization-based Scheduling for Offloading in Mobile Edge Computing
Jingyun Feng; Zhi Liu; Celimuge Wu; Yusheng Ji
Oral presentation, English, IEICE Society Conference, IEICE, Domestic conference
Sep. 2016 - Emulation evaluations of Tor Schedulers with Active Circuit Switching
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, 情報処理学会セキュリティ心理学とトラスト合同研究会, 情報処理学会, Domestic conference
Sep. 2016 - An Automatic Disaster Recovery Scheme for Inter-cloud Environment
Atsuya Mizota; Takayuki Shiroma; Takuma Nakajima; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Aug. 2016 - An Impact of In-Network Caching on Energy Saving for ISP Networks
Kota Nojima; Takayuki Shiroma; Takuma Nakajima; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Aug. 2016 - A context-aware unified routing protocol for vehicular ad hoc networks
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Aug. 2016 - Design Evaluation of Low-Latency Handshake Join on FPGA
Masato Yoshimi; Yasin Oge; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
25 Mar. 2016 - Hierarchical Cache Strategies for VOD Networks with Popularity Change
Takuma Nakajima; Takayuki Shiroma; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
25 Mar. 2016 - Analyzing the Traffic Correlation-Based Attacks on Tor
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE General Conference, IEICE, Domestic conference
16 Mar. 2016 - Storing data in VANETs
Celimuge Wu; Tsutomu Yoshinaga; Yusheng Ji; Tutomu Murase
Oral presentation, English, IEICE General Conference, IEICE, Domestic conference
15 Mar. 2016 - FPGA-based Parallel Processing of Sliding-Window Aggregate Queries on Data Streams
Yoshimitsu Ogawa; Yasin Oge; Masato Yoshimi; Celimuge Wu; Tsutomu Yoshinaga
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Jan. 2016 - Reinforcement learning-based parameter tuning for a broadcast protocol in VANETs
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Tsutomu Yoshinaga; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2016 - Resource Allocation and Layer Selection for Video Streaming over Highway Networks Using Scalable Video Coding
Ruijian An; Zhi Liu; Hao Zhou; Celimuge Wu; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2016 - Performance comparison between a hybrid DCF/TDMA QoS scheme and the pure TDMA approach
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2016 - IEEE802.11n無線LANにおけるTCPダウンロード通信のパフォーマンスアノマリーの実験的解析
橋本善季; 野元祐孝; 策力木格; 大坐畠智; 加藤聰彦
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Nov. 2015 - Adaptive Multi-hop Broadcasting Considering Packet Payload Size
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Nov. 2015 - Improving Traffic Load Distribution for Tor Network
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Oct. 2015 - IEEE802.11n無線LANのダウンロードデータ転送におけるパフォーマンスアノマリーに関する実験的考察
橋本善季; 野元祐孝; 策力木格; 大坐畠智; 加藤聰彦
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Sep. 2015 - IEEE 802.11nアクセスポイントにおけるMAC再送の制限によるTCP通信のBufferfloat問題の改善
野元祐孝; 策力木格; 大坐畠智; 加藤聰彦
Oral presentation, Japanese, IEICE Technical Report, IEICE, Domestic conference
Sep. 2015 - An Efficient Time Slot Allocation Scheme for QoS flows in Ad Hoc Networks
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jun. 2015 - Inter-vehicle Communications: Research Challenges & Opportunities
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
May 2015 - Multihop Ad-hoc Networking for Smart Garage: Experiment and Results
Ruijian An; Celimuge Wu; Dong Yu; Yusheng Ji; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE General Conference, IEICE, Domestic conference
Mar. 2015 - Towards Improving Congestion Control in Tor
Timothy Girry Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE General Conference, IEICE, Domestic conference
Mar. 2015 - A Routing Protocol for Drive-thru Internet Access in Delay Tolerant Vehicular Ad Hoc Networks
Yoshimasa Ohya; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2015 - Performance Evaluation of QoS Supporting Ad Hoc Scheme Combing TDMA and 802.11 DCF
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2015 - Consideration on iOS TCP Performance Problem at Busty Packet Losses
Weikai Wang; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2015 - Cloud on the road: an autonomic computing framework in vehicular environment
Jingyun Feng; Celimuge Wu; Yusheng Ji
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2015 - Common Service Platform for Electric Vehicles
Jing Wei; Jinglin Li; Zhihan Liu; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jan. 2015 - A Design of Circuit Switching Method for Reducing Congestion in the Tor Network
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, Domestic conference
Oct. 2014 - Characterization of TCP Congestion Control Algorithm by Estimating Congestion Window - Increase Relation and Decrease Parameter
Atsushi Oda; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Sep. 2014 - A Multi-hop Broadcast Protocol for WAVE Multi-channel Single-radio Vehicular Networks
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Society Conference, Domestic conference
Sep. 2014 - Measuring output buffer utilization for Interactive Users in Tor
Timothy G. Kale; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Society Conference, Domestic conference
Sep. 2014 - A Study on QoS Support in Ad Hoc Networks Using TDMA and 802.11 DCF
Jing Lin; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Domestic conference
Jul. 2014 - A Multi-hop Broadcast Protocol for VANETs Utilizing Backbone-based Forwarding and Network Coding
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, Domestic conference
Jul. 2014 - Inter-flow Network Coding for Unicast Routing Protocols in Vehicular Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report, IEICE, Kagawa University, Domestic conference
26 Jun. 2014 - A Cross Layer Approach for Multi-hop Broadcasting in VANETs with Reserved Time Slots
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE General Conference, IEICE, Niigata, Domestic conference
19 Mar. 2014 - Towards Improving Congestion Control in Tor
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE General Conference, IEICE, Niigata, Domestic conference
19 Mar. 2014 - An Evaluation of Node-Based Delays in Tor Network
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Jan. 2014 - Behavior Analysis of Different TCP Implementations under Burst Error Environment
Weikai Wang; Toshihiko Kato; Celimuge Wu; Satoshi Ohzahata
Oral presentation, English, IEICE Technical Report
Jan. 2014 - A VANET Routing Protocol Considering MAC Efficiency
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Nov. 2013 - The Effect of Node-Based Delays on Tor Performance
Kale Timothy Girry; Satoshi Ohzahata; Celimuge Wu; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Oct. 2013 - Improving VANET unicast routing protocols by using network coding and cooperative relays
Celimuge Wu; Satoshi Ohzahata; Yusheng Ji; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Oct. 2013 - Improvement of TCP Delay Performance at Large Rate Change in IEEE 802.11n Wireless LANs
野元祐孝; 加藤聰彦; 策力木格; 大坐畠智
Oral presentation, Japanese, IEICE Technical Report
Sep. 2013 - A Backbone-based Multi-hop Broadcast Protocol for VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Society Conference
Sep. 2013 - An Implementation-friendly Broadcast Protocol for VANETs Utilizing Neighbor Information
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE
Jul. 2013 - A Fuzzy Inference Intelligent Routing Protocol for Vehicular Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE
Jul. 2013 - A MAC protocol to improve QoS in VANETs using contention window adjustment
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Apr. 2013 - An Implementation-friendly Multi-hop Broadcast Protocol for VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE General Conference
Mar. 2013 - Improving OLSR for highly mobile and lossy networks
Narangerel Dashbyamba; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Nov. 2012 - A Redundant Transmission Mechanism for WSNs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Society Conference
Sep. 2012 - Fuzzy logic based MPR selection for OLSR
Narangerel Dashbyamba; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Sep. 2012 - Fast and reliable data collection in WSNs with adaptive redundant transmission
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Jul. 2012 - A VANET routing protocol with full utilization of opportunism
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Apr. 2012 - A PU Aware Route Discovery Approach for Cognitive Ad Hoc Networks
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Mar. 2012 - A Primary User Aware Routing Protocol for Cognitive CSMA/CA Ad Hoc Networks
Tatsuaki Nakato; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE General Conference
Mar. 2012 - Detailed Analysis of iPad2 TCP Behaviours
Weikai Wang; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Jan. 2012 - Joint Retransmission and Relay Node Selection Scheme for Multi-hop Broadcast in VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Nov. 2011 - A Study on TCP Performance of Android Tablet Devices
Celimuge Wu; Weikai Wang; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Sep. 2011 - A Lightweight Approach for Reliable Broadcast in VANETs
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Society Conference
Sep. 2011 - Improvement of One-phase Pull Diffusion Using Fuzzy Logic
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Jul. 2011 - Performance analysis of iPad TCP communications
Weikai Wang; Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, English, IEICE Technical Report
Jun. 2011 - A multi-hop broadcast protocol for driver assistance in high-density environments
Celimuge Wu; Satoshi Ohzahata; Toshihiko Kato
Oral presentation, Japanese, IEICE Technical Report
Sep. 2010 - Enhancing AODV Routing Protocol Using Q-Learning
Celimuge Wu; Kazuya Kumekawa; Toshihiko Kato
Oral presentation, English, IEICE Society Conference
Sep. 2009
Courses
- Logic Circuit
Apr. 2024 - Mar. 2025
電気通信大学 - Computer Design
Apr. 2023 - Mar. 2024 - Network Computing
Apr. 2023 - Mar. 2024 - Logic Circuit
Apr. 2023 - Mar. 2024 - 現代の情報技術
Dec. 2023 - Dec. 2023
Hoshi University - Logical Circuits
The University of Electro-Communications - MICS実験第二
The University of Electro-Communications - MICS実験第二
電気通信大学 - 現代の情報技術
Hoshi University - 現代の情報技術
星薬科大学 - Graduate Technical English
The University of Electro-Communications - 大学院技術英語
電気通信大学 - Logic Circuit Design
The University of Electro-Communications - 論理設計学
電気通信大学 - Elements of Information Network Systems 2
The University of Electro-Communications - 情報ネットワーク学基礎 2
電気通信大学