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IEEE802.11e是WLAN物理层和MAC层广泛使用的标准,然而IEEE802.11e增强型分布式协调接入机制(EDCA)的重设竞争窗口算法会导致高负载情况下的低优先级业务资源耗尽。本文提出了改进方案,修改了包成功传输后的竞争窗口算法,减少竞争窗口值的变化。仿真结果显示改进方案能够改善低优先级业务的网络性能,并且缓解了网络的拥塞,提高了高优先级业务的吞吐量,降低了抖动。
IEEE802.11e is a widely used standard in the WLAN physical layer and MAC layer. However, the reconfiguration contention window algorithm of the IEEE802.11e Enhanced Distributed Coordinated Access Mechanism (EDCA) results in exhaustion of low-priority service resources in high load conditions . In this paper, we propose an improved scheme to modify the contention window algorithm after successful packet transmission and reduce the change of contention window. The simulation results show that the improved scheme can improve the network performance of low-priority services, alleviate the network congestion, improve the throughput of high-priority services and reduce the jitter.