多速率最优竞争窗口的WLAN退避算法

摘要

This paper brings up a multi-rate optimized contention window algorithm after studying fore researches on multi-rate backoff algorithms in IEEE 802.11 DCF.The core of this algorithm is using the optimized contention window as nodes' initial contention window value based on time equity,in order to reduce the probability of data collision.The results of emulational experiments show that under saturated environment,the performance on time equity and system throughput is better than fore algorithms.%在对原有的IEEE 802.11 DCF多速率退避算法研究的基础上,提出了基于多速率的最优竞争窗口退避算法(Multi-rateOptimized Contention Window algorithm,MOCW).该算法的核心思想是在多速率时间公平性的基础上,利用理论上的最优窗口值作为节点的初始窗口值,以此来减小多节点同时发送数据时的碰撞概率.仿真实验表明,该算法在饱和状态下,无论在时间公平性还是系统吞吐量的性能上都有所提高.