一种改进的无线局域网对尽力而为服务的应用  

Improved Application to Best-Effort Service of WLAN

作　　者：田宁红[1] 周敏[1] 龙昭华[1] 王俊峰[1] 

机构地区：[1]重庆邮电学院,重庆400065

出　　处：《计算机工程与应用》2006年第31期120-122,148,共4页Computer Engineering and Applications

基　　金：重庆市教委项目(050306)

摘　　要：从改善WLAN的尽力而为服务为出发点,简单介绍了DCF﹑EDCF和PCF,并分析了它们对尽力而为服务的机制和弊端。在此基础上,讨论了竞争窗口对系统总吞吐量和尽力而为服务的影响,从提高公平性﹑加大吞吐量的角度,提出了运用动态优先权来降低尽力而为业务的接入时延,并仿真得出结论。In order to raise the QoS of WLAN,we take a serious of measures.The IEEE802.11 Distributed Coordination Function（DCF） offers only best-effort services.The Enhanced DCF（EDCF） supports QoS by establishing a probabilistic priority mechanism to access the shared wireless medium.In this paper,we simply analyse EDCF and PCF mechanism to assure the premise of QoS of real-time services and play down the QoS of best-effort service,which leads to an undesirable service differentiation.On the basis,we apply the dynamical priority for the best-effort service to reduce delay and simulate to receive our results.

关 键 词：IEEE 802.11e协议 公平加权排队算法 动态优先权 吞吐量 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]