Seminar Speaker
Date: Thursday, September 23rd, 2010, 3:30PM, SB Conference Room 2nd floor
Title: Improving the Performance and Usability of Wireless Internet Access in WLAN
Speaker: Yong Cui -- Tsinghua University
Abstract
Along with the development of wireless communication technologies, Wireless Local Area Networks (WLANs) have been widely deployed to support the convenient access for end users. However, WLANs face some critical issues, including channel interference, coverage limitation and so on. We investigate the problem of partially overlapping channel assignment to improve the performance of 802.11 wireless networks in the scenario of dense WLAN. A novel interference model is derived to take into account both the adjacent channel separation and the physical distance of the two nodes employing adjacent channels. We formulate a generalized optimization problem, and propose an approximate algorithm with rigorous performance analysis. For the sparse WLAN, we propose a novel access pricing mechanism to encourage selfish end users to be multi-hop relays to improve the coverage area. Based on our bandwidth demand models, optimal bandwidth allocation schemes and heuristic algorithms are proposed to compute bandwidth allocation and relay-client associations.
Biography
Yong Cui, Ph.D., Associate Professor in Tsinghua University, Council Member in China Communication Standards Association (CCSA). He directed several national R&D projects, funded by Chinese Next Generation Internet Plan (CNGI), National Natural Science Foundation of China (NSFC), and Development Plan of the State High Technology Research of China (863). He also participated as a major player in a key project funded by National Basic Research Plan of China (973 Program). He published more than 90 papers and holds over 30 patents. His major research interests include wireless mobile Internet, the network architecture and next-generation Internet. He is the co-author of RFC 5565 and RFC 5747 in the field of IPv4/IPv6 coexistence. His email is cuiyong@tsinghua.edu.cn.