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《Journal of South China University of Technology(Natural Science Edition)》 2007-01
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Enhanced TCP Vegas Protocol for Asymmetric Networks

Liu Jing Chen Fang-jiong Wei Gang (School of Electronic and Information Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China)  
It has been proved that the TCP Vegas protocol underutilizes the available bandwidth in asymmetric networks although it possesses better performance than the traditional TCP protocol.In order to solve this problem,an enhanced TCP Vegas algorithm is proposed.In this algorithm,the ecn_to_echo_bits in the acknowledge packets are first used to estimate the congestion probability in the backward path,proving that the change of Round-Trip-Time(RTT) is directly proportional to the change of congestion probability.Then,when backward congestion occurs,the change of RTT is estimated by monitoring the change of congestion probability.Thus,the actual RTT before the congestion is obtained,which is used to implement the TCP Vegas protocol.The simulations based on NS-2 show that the proposed algorithm is more applicable than the existing Vegas algorithm when the congestion occurs both in forward and backward paths.
【Fund】: 国家自然科学基金资助项目(60402014);; 广东省自然科学基金资助项目(31390)
【CateGory Index】: TP393.02
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