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IEEE 802.11无线局域网的TCP性能分析和改进
引用本文:赵力强,张海林.IEEE 802.11无线局域网的TCP性能分析和改进[J].计算机学报,2005,28(11):1934-1938.
作者姓名:赵力强  张海林
作者单位:西安电子科技大学综合业务网理论及关键技术国家重点实验室,西安,710071
摘    要:在分析IEEE 802.11无线局域网媒体接入控制(MAC)协议和传输控制协议(TCP)性能的基础上,提出了改进的MAC协议:BDCF.IEEE 802.11分布式协调功能(DCF)只支持前向数据传输,即数据帧只能由发送方传送到接收方.BDCF利用IEEE 802.11点协调功能(PCF)提供的数据帧格式,可以实现信息的双向传输,即收发双方相互交换数据帧.因此BDCF更适合传输面向连接的TCP业务.BDCF与IEEE 802.11完全兼容.仿真结果表明:BDCF可以提高网络吞吐量和降低数据帧的时延,理论分析结果基本准确.

关 键 词:无线局域网  媒体接入控制  传输控制协议  分布式协调功能  点协调功能
收稿时间:2003-11-04
修稿时间:2003-11-042005-07-09

TCP Performance Analysis and Enhancement of IEEE 802.11 WLAN
ZHAO Li-Qiang,ZHANG Hai-Lin.TCP Performance Analysis and Enhancement of IEEE 802.11 WLAN[J].Chinese Journal of Computers,2005,28(11):1934-1938.
Authors:ZHAO Li-Qiang  ZHANG Hai-Lin
Abstract:Based on media access control(MAC) protocol and transport control protocol(TCP) performance analysis of IEEE 802.11 WLAN,a novel MAC protocol,BDCF,is proposed in this paper.IEEE 802.11 distributed coordination function(DCF) only supports transmission in the forward direction from senders to receivers.In BDCF,data frames are transmitted in bi-direction,from senders to receivers and from receivers to senders,by means of a data frame type defined in IEEE 802.11 point coordination function(PCF).Hence,BDCF is more suitable than DCF to transmit TCP traffic over WLAN.BDCF is fully compatible with IEEE 802.11.Simulation results show that BDCF can improve the network throughput and decrease delay of data frames.Moreover,the proposed analytical model is accurate.
Keywords:WLAN  Medium Access Control(MAC)  Transmission Control Protocol(TCP)  Distributed Coordination Function(DCF)  Point Coordination Function(PCF)  
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