Analysis of Two-Level-Polling System with Mixed Access Policies
The support for real-time services par ticularly with QoS guarantees is a challenge in de sign of MAC protocol for Wireless Local Area Net works (WLANs), several kinds of mixed polling mechanism have been enrolled in design of Point Coordination Function(PCF) MAC protocol recently. In this paper, we propose a novel and efficient mixed polling system with two-level-polling scheme, which consists of a hub station and N common stations in a WLAN, and the hub station and N common stations have been provided with exhaustive service and lim ited-1 service in discrete time respectively. By the embedded Markov chain theory and the probability generating function method, our scheme gives closed form expressions for obtaining the mean queue length and the mean waiting time, and analytical results are verified through extensive simulations. The results of our system can be potentially used as a model for differentiating services to guarantee better QoS and system stability in IEEE 802.11 WLANs, and it has better efficiency and impartiality than that of the traditional polling system with only exhaustive or iimited-1 service.
Wireless local area network (WLAN) polling system mean queue length mean waiting time
LIU Qianlin ZHAO Dongfeng
Department of Communication Engineering, Yunnan University Kunming, PR China
国际会议
长沙
英文
3336-3339
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）