IEEE802.11无线局域网非饱和吞吐量分析

Throughput Analysis of IEEE 802.11 WLANs in Non-Saturated Conditions

当前关于IEEE802.11无线局域网DCF性能分析研究通常假设网络工作在饱和条件下,但是对于实际的IEEE802.11局域网而言,非饱和工作状态更为普遍。本文针对非饱和条件下的IEEE802.11无线局域网,提出了一种基于二维马尔可夫链的分析模型,推导得到吞吐量与网络非饱和程度之间的定量数学表达式。结果表明,非饱和吞吐量可以超过饱和吞吐量,在一定的非饱和程度下,网络吞吐量可以最大化,在多数情况下RTS/CTS接入机制优于基本接入机制。

This paper presents a bidimensional Markovain chain model to evaluate the throughput of IEEE 802. 11 Wireless LANs in non-saturation conditions. The impact of non-saturation degree on the throughput of both basic and RTS/CTS access mechanisms are analyzed and compared. It＇s shown the throughput of basic access scheme will be significantly affected by non-saturation degree.