电子学报 ›› 2006, Vol. 34 ›› Issue (10): 1877-1880.

• 论文 • 上一篇    下一篇

IEEE802.11无线局域网中一种支持业务区分的回退算法

李 云1,2, 隆克平2, 赵为粮1, 陈前斌1   

  1. 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
  • 收稿日期:2005-04-04 修回日期:2006-03-20 出版日期:2006-10-25 发布日期:2006-10-25

A Novel Service Differentiated Backoff Algorithm in IEEE 802.11 WLAN

LI Yun1,2, LONG Ke-ping2, ZHAO Wei-liang1, CHEN Qian-bin1   

  1. 1. Special Research Centre for Optical Internet & Wireless Information Networks,Chongqing University of Posts & Telecommunications,Chongqing 400065,China;2. Research Centre for Optical Internet & Mobile Information Networks,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China
  • Received:2005-04-04 Revised:2006-03-20 Online:2006-10-25 Published:2006-10-25

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.

关键词: IEEE802.11, 无线局域网, 业务区分, DS-RWBO

Abstract: 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 proposed to 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.

Key words: IEEE802.11, wireless LAN, service differentiation, service differentiated RWBO

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