IEEE802.11无线局域网中一种支持业务区分的回退算法  

A Novel Service Differentiated Backoff Algorithm in IEEE 802.11 WLAN

作　　者：李云[1] 隆克平[2] 赵为粮[1] 陈前斌[1] 

机构地区：[1]重庆邮电学院光互联网及无线信息网络研究中心,重庆400065 [2]电子科技大学光互联网及移动信息网络研究中心,四川成都610054

出　　处：《电子学报》2006年第10期1877-1880,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.90304004);教育部新世纪优秀人才支持计划基金(NCET);重庆市教委项目(No.KJ050503);重庆市科委项目(No.8817)

摘　　要：支持QoS的MAC机制是WLAN支持QoS的关键所在.我们已经给出了一种低分组碰撞概率的MAC层回退机制———RWBO+BEB.该文进一步讨论如何让RWBO+BEB支持业务区分的问题.首先提出了一个Markov链模型,分析如何根据无线终端的带宽比率设置最小竞争窗口,然后给出了一种新的支持业务区分的回退算法———DS-RWBO,仿真结果表明,DS-RWBO能根据局域网中每个终端的带宽比率分配无线信道的带宽资源.It is essential to design QoS supported MAC mechanism for supporting QoS in wireless LAN. We have proposed a new backoff algorithm, names RWBO ＋ BEB, to dramatically decrease the packet collision probability. In this paper, we explore how to make RWBO ＋ BEB support service differentiation. A Markov model is proposedto analyze how to choose the minimum contention windows according to the bandwidth ratios of stations. Based on the analysis, a novel service differentiated backoff algorithm for IEEE 802.11 DCF,named DS-RWBO,is proposed. The simulation results indicate that DS-RWBO can allocate the wireless bandwidth according to the bandwidth ratio of each station.

关 键 词：IEEE802.11 无线局域网 业务区分 DS-RWBO 

分 类 号：TN92[电子电信—通信与信息系统]