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一种改进IEEE802.11DCF的建模与分析

DOI: 10.13190/j.jbupt.2014.05.020, PP. 96-99

Keywords: 分布式协调功能,马尔可夫模型,非饱和数据流,服务质量

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Abstract:

针对IEEE802.11系列标准中分布式协调功能(DCF)的缺点,提出了一种简单有效的改进DCF算法.其主要的改进集中在2方面在经典DCF的基础上,将第0级退避的退避窗口值加倍;使用选择概率p将第0级退避窗口分割成2部分.为了精确地反映改进后协议的性能,建立了二维马尔可夫模型,并将其与经典DCF比较.数值仿真结果表明,改进后的DCF协议在终端节点密度较大时,其吞吐量和时延等性能参数要比经典的DCF优越.

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