无线自组织网络中TCP稳定性的分析及改进

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无线自组织网络中TCP稳定性的分析及改进
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基金项目:Supported by the National High-Tech Research and Development Plan of China under Grant No.2001AA120303 (国家高技术研究发展计划(863)); the Program of Chongqing Science and Technology Committee of China under Grant No.D2002-35 (重庆市科委计划项目); the Young Foundation of Chongqing University of Posts and Telecommunication of China under Grant No.A2002-20 (重庆邮电学院青年教师基金); the Open Foundation of the Key Laboratory of Mobile Communication of Chongqing of China under Grant No.YDFS-2001-02 (重庆市移动通信重点实验室开放基金); the Key Subject Developing Foundation of Communication and Information System of Chongqing of China under Grant No.YDJS-2002-02 (重庆市通信与信息系统重点学科建设基金)

Analyzing and Improving the TCP Stability in Wireless Ad Hoc Networks

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摘要:

在无线自组织网络中,基于IEEE 802.11的TCP流存在严重的不稳定性,其原因与MAC协议、路由协议和TCP本身均有一定的关系,但最根本之处在于MAC协议的不公平性以及假的链路失效消息导致了不必要的耗时的路由发现过程.结合IEEE802.11的MAC协议和DSR路由协议,对这些原因进行了深入的理论分析和仿真实验,并提出了针对MAC协议和路由协议的改进算法.仿真结果证明,提出的改进算法不仅能基本上避免TCP流的不稳定性,还能够极大地提高TCP流的平均吞吐量.

Abstract:

Due to the MAC (medium access control) protocol, routing protocol and TCP itself, the TCP flow is very unstable in the wireless Ad Hoc networks based on IEEE802.11. However, the main reasons that make the TCP flow unstable are the unfairness of MAC protocol and the false link failure message that causes the long route discovery procedure. Combining with the IEEE802.11 MAC protocol and DSR routing protocol, these causes are analyzed in detail and the enhanced algorithm to IEEE802.11 MAC protocol and DSR routing protocol is given in this paper. The simulational results show that the proposed algorithm can ultimately avoid the instability of TCP flow and increase its average throughput in the wireless Ad Hoc networks.

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李云,陈前斌,隆克平,吴诗其.无线自组织网络中TCP稳定性的分析及改进.软件学报,2003,14(6):1178-1186

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收稿日期:2002-11-19
最后修改日期:2002-11-19
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