高速移动环境下提高WLAN有效吞吐量方法的研究

摘要

在高速列车等移动环境下,WLAN中所有的无线节点STA(Station)必须通过接入点AP( Access Point)和其它网络互联,接入点成为提高网络有效吞吐量的瓶颈.本文针对IEEE802.11 a DCF(Distributed Coordination Function)协议提出改进方案,对STA和AP的退避算法进行相应改进,从而提高AP抢占信道的优先级.仿真结果证明,改进算法显著提高了高速移动环境下含AP网络的有效吞吐量,改善了WLAN的整体性能.%In the mobile environments of high-speed railways and so on, all wireless stations (STA) in the wireless local area network (WLAN) must be interconnected with other networks through access points (AP), so Aps become the bottleneck to enhance the effective network throughput. On the basis of the IEEE802. lla DCF (distributed coordination function) Protocol, we propose a scheme to improve the STA and AP backoff algorithms simultaneously so as to heighten the AP priority in channel control. The simulation result proves that the improved algorithm raises the effective throughput of the network with Aps in the high-speed mobile environment significantly and improves the overall performance of the WLAN.