802.11 DCF(Distributed Coordination Function)性能的分析和改进是MAC(Medium Access Control)中一个重要的研究领域.本文在该协议的基础上提出了一种竞争窗口增长因子自适应调整算法—SCWGF(Self-adaptive algorithmof adjusting Contention Window’s Growth Factor),通过理论分析得到不同竞争节点数下竞争窗口增长因子的最优解和最优冲突时间占用率,提出了使用自适应算法使竞争窗口增长因子收敛到最优解,仿真结果表明SCWGF提高了网络的饱和吞吐量.
The performance analysis and improvement of 802.11DCF(Distributed Coordination Function)is a crucial research domain of MAC(Medium Access Control).This paper presents SCWGF(Self-adaptive algorithm of adjusting Contention Window's Growth Factor)based on 802.11 DCF.Firstly,we obtain the optimal contention window's growth factor and optimal collision occupation ratio through theoretical analysis.Self-adaptive algorithm of adjusting contention window's growth factor convergent to the optimal one was proposed.Simulation result illustrates that saturated throughput can be improved.