1. Seminar Announcement
Dec 25 , Wednesday, 10:30-11:30, 南一楼中302，电信系会议室
802.11e EDCA Networks: Modeling, Differentiation, Optimization
Yayu Gao
City University of Hong Kong
Abstract
IEEE wireless local area networks (WLANs) have gained significant attention in both industry and academia. To meet the soaring demand of quality-of-service (QoS) support for multimedia applications, IEEE e working group has standardized enhanced distributed channel access (EDCA) as the medium access control (MAC) protocol for WLANs. Although it was long observed that the network throughput with the current EDCA standard setting may significantly degrade as the network size grows, how to properly tune the backoff parameters to optimize the network throughput performance under a certain differentiation requirement remains largely unknown. To tackle this open issue, a new analytical model is proposed, based on which the maximum network throughput is derived as an explicit function of the holding time of head-of-line (HOL) packets in successful transmission and collision states. The optimal initial backoff window sizes to achieve the maximum network throughput under pre-specified target node-throughput ratios are also obtained, and verified by simulation results. The analysis provides direct guidance on practical network design for IEEE e EDCA networks.
Biography
Yayu Gao received the B.S. in Electronic Engineering from Nanjing University of Posts and Telecommunications, Nanjing, China, in 2009, and is currently pursuing the Ph.D. degree at the Department of Electronic Engineering, City University of Hong Kong. Her research interests include performance evaluation, optimization and Quality-of-Service guarantee of wireless random access networks.