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中文摘要：
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．
英文摘要：
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.
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