摘要
IEEE802.11e的增强分布式信道接入机制(EDCA)对业务的服务质量提供支持,由于其增强高优先级信道竞争能力而提供服务区分的主要特点而应用于AdHoc网络中。本文探讨了802.11e应用于多跳无线网络在不同的侦听范围下RTS/CTS有效性问题,指出:网络仿真工具NS2中对于节点传输范围和侦听范围的默认设置使得MAC层使用了RTS/CTS后网络性能变差。通过理论分析,并对不同侦听范围、跳数增加、TCP最大窗口的减小在有无RTS/CTS时的不同性能表现进行仿真分析,最终确定结论的正确性。
The Enhanced Distributed Channel Access （EDCA） of the IEEES02.11e network provides different traffic streams with QoS （quality of service）.802.11e is applied in Ad Hoc networks because of enhanced channel contention ability of high priority traffic streams. This paper pointed out that the default setting of transmission range and carrier sensing range made the performance of net-work worse through discussion of RTS/CTS efficiency with different carrier sensing range. The theoretic analysis and simulation results of different performance with different carrier sensing range,hop,TCP window under the case if there is RTS/CTS show the correctness of the consequence.
出处
《微计算机信息》
2009年第18期107-109,共3页
Control & Automation
