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Modeling the Short-Term Unfairness of IEEE 802.11 in Presence of Hidden Terminals

机译:在存在隐藏终端的情况下对IEEE 802.11的短期不公平性进行建模

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摘要

In this paper, using a simple hidden-terminal scenario, we show that IEEE 802.11 exhibits substantial short-term unfairness, though it provides long-term fairness. We analyze the short-term behavior using embedded-Markov chain method to answer the following two questions: (ⅰ) once a node gets control of the medium, what is the average number of packets this node can transmit consecutively without experiencing any collision, (ⅱ) once a node loses its control of the medium, what is the average time the node has to wait before it gets control of the medium again. The first question reflects on how long a node can capture the medium, whereas the second question reflects on how long a node may be starved. The analytical model is validated by the simulation results. Our work is distinct from most of the work published in the literature in two aspects: we focus on the short-term behavior rather than the long-term, and the analytical method is adopted for the study.
机译:在本文中,我们使用一种简单的隐藏终端方案,证明了IEEE 802.11尽管具有长期的公平性,但却表现出了短期的不公平性。我们使用嵌入式马尔可夫链方法分析短期行为,以回答以下两个问题:(ⅰ)一旦节点获得了介质的控制权,该节点可以连续传输而不会遇到任何冲突的平均数据包数量为( ⅱ)一旦节点失去了对媒体的控制权,该节点在再次获得媒体控制权之前必须等待的平均时间是多少。第一个问题反映了一个节点可以捕获介质的时间,而第二个问题反映了一个节点可能饿了多久。通过仿真结果验证了解析模型。我们的工作与文献上发表的大多数工作有两个方面的区别:我们关注短期行为而不是长期行为,并且采用分析方法进行研究。

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