Institute of Information Science, Academia Sinica

In this talk, we will present a novel Decentralized Separate Coding (DSC) scheme, as a solution to solve the challenging problem of continuous data collection in wireless sensor networks with a mobile base station. DSC is linear coding with a specific randomized structure inspired by network coding on random bipartite graphs. The network codes of DSC are created in a decentralized way with low communication, storage and computation cost. By separately encoding a certain number of data segments in a combined segment and doing decoding free data replacement, DSC provides efficient storage method for the continuous data. We show that the proposed DSC achieves high success ratio of data collection. The comprehensive performance evaluation has been conducted through computer simulation. It is shown that DSC outperforms the existing scheme significantly. In this talk, we will also introduce other research work conducted in our lab in wireless sensor and ad hoc networks.

Professor Li received the B.E. degree in computer science from Zhejiang University, Hangzhou, China, the M.E. degree in electronic engineering and communication systems from China Academy of Posts and Telecommunications, Beijing, China. He received the Dr. Eng. degree from the University of Electro-Communications, Tokyo, Japan. He also had been a research engineer in China Academy of Posts and Telecommunications, Beijing. He is now a Professor with University of Tsukuba, Japan. His research interests are in wireless distributed multimedia computing and networking, network security, modeling and performance evaluation of information systems. He is a senior member of IEEE and ACM, and a member of Information Processing Society of Japan (IPSJ). He has served as a secretary for Study Group on System Evaluation of IPSJ and on several editorial boards for IPSJ Journal, Wiley Wireless Communications and Mobile Computing, and International Journal of High Performance Computing and Networking, and so on, and on Steering Committees of the SIG of System EVAluation (EVA) of IPSJ, the SIG of DataBase System (DBS) of IPSJ, and the SIG of MoBiLe computing and ubiquitous communications of IPSJ. He has also served on the program committees for several international conferences such as IEEE ICC, INFOCOM, GlobeCom.