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MANET中TCP改进研究综述
引用本文:冯彦君,孙利民,钱华林,宋成. MANET中TCP改进研究综述[J]. 软件学报, 2005, 16(3): 434-444
作者姓名:冯彦君  孙利民  钱华林  宋成
作者单位:中国科学院,网络信息中心,北京,100080;中国科学院,计算技术研究所,北京,100080;中国科学院,研究生院,北京,100039;中国科学院,软件研究所,北京,100080;中国科学院,网络信息中心,北京,100080
基金项目:Supported by the National High-Tech Research and Development Plan of China under Grant Nos.2001AA112040, 2001AA112136 (国家高技术研究发展计划(863)); the National Natural Science Foundation of China under Grant No.60272078 (国家自然科学基金)
摘    要:传统TCP(transmission control protocol)本是为有线网络设计,它假设包丢失全是由网络拥塞引起,这个假设不能适应于MANET (mobile ad hoc network),因为MANET中除了拥塞丢包以外,还存在由于较高比特误码率、路由故障等因素引起的丢包现象.当出现非拥塞因素丢包时,传统TCP将错误地触发拥塞控制,从而引起TCP性能低下.任何改进机制都可以分为发现问题和解决问题两个阶段.首先概括了MANET中影响TCP性能的若干问题;然后针对发现问题和解决问题两个阶段,详细地对每一阶段中存在的各种可行方法进行了分类、分析和比较;最后指出了MANET中TCP性能优化的研究方向.

关 键 词:MANET(mobile ad hoc network)  TCP(transmission control protocol)  性能  包丢失
文章编号:1000-9825/2005/16(03)0434
收稿时间:2004-08-15
修稿时间:2004-08-15

Improving TCP Performance over MANET: A Survey
FENG Yan-Jun,SUN Li-Min,QIAN Hua-Lin and SONG Cheng. Improving TCP Performance over MANET: A Survey[J]. Journal of Software, 2005, 16(3): 434-444
Authors:FENG Yan-Jun  SUN Li-Min  QIAN Hua-Lin  SONG Cheng
Abstract:As originally designed for wired networks, TCP (transmission control protocol) congestion control mechanism is triggered into action when packet loss is detected. This implicit assumption for packet loss mostly due to network congestion does not work well in Mobile Ad Hoc Network, where there is a comparatively high likelihood of packet loss due to high bit error rate (BER) and node roaming. Such non-congestion packet loss, when dealt with by congestion control mechanism, causes poor TCP performance in MANET. All improvement mechanisms have two distinct phases: problem detection and problem solving. This paper attempts to address this problem by first summarizing over several major reasons for such mis-behavior, an in-depth analysis and the detailed comparison between different solutions are proposed to improve at each of the two phases. Finally, some new research directions for optimizing TCP performance in MANET (mobile ad hoc network) are suggested.
Keywords:MANET (mobile ad hoc network)  TCP (transmission control protocol)  performance  packet loss
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