Modeling the 802.11 distributed coordination function in nonsaturated heterogeneous conditions
Modeling the 802.11 distributed coordination function in nonsaturated heterogeneous conditions
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DOI：
10.1109/tnet.2006.890136
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发表时间：
2007-02-01
影响因子：
3.7
通讯作者：
Leith, Doug
中科院分区：
文献类型：
--
作者：
Malone, David;Duffy, Ken;Leith, Doug
最近，对802.11 CSMA/CA机制的分析受到了相当大的关注。比安奇提出了一个饱和交通假设下的分析模型。比安奇的模型是准确的，但典型的网络条件是非饱和和异质的。我们把他的模型推广到非饱和环境。该模型的预测经过模拟验证后，准确地捕捉到了非饱和运行的许多有趣特征。例如，该模型预测峰值吞吐量出现在饱和之前。我们的模型允许站点具有不同的流量到达率，使我们能够解决竞争流量之间的公平性问题。虽然我们使用特定的到达过程，但它包含了广泛的有趣的流量类型，特别是VoIP。
Analysis of the 802.11 CSMA/CA mechanism has received considerable attention recently. Bianchi presented an analytic model under a saturated traffic assumption. Bianchi's model is accurate, but typical network conditions are nonsaturated and heterogeneous. We present an extension of his model to a nonsaturated environment. The model's predictions, validated against simulation, accurately capture many interesting features of nonsaturated operation. For example, the model predicts that peak throughput occurs prior to saturation. Our model allows stations to have different traffic arrival rates, enabling us to address the question of fairness between competing flows. Although we use a specific arrival process, it encompasses a wide range of interesting traffic types including, in particular, VoIP.