无线异构网络TCP性能研究与改进  

RESEARCH ON TCP PERFORMANCE IN WIRELESS HETEROGENEOUS NETWORKS AND ITS IMPROVEMENT

作　　者：肖锴[1] 章国安[1] 

机构地区：[1]南通大学电子信息学院,江苏南通226019

出　　处：《计算机应用与软件》2013年第5期41-43,共3页Computer Applications and Software

基　　金：国家自然科学基金项目(61071086);江苏省自然科学基金项目(11KJB510021);南通市社会发展计划项目(HS2011015)

摘　　要：同构网络中TCP Vegas在吞吐量和稳定性方面比TCP Reno拥有更好的性能。但是在Vegas-Reno并存的异构网络中,由于Reno具有侵略性的控制机制,使得TCP Vegas不能够公平地分享带宽,其性能也大幅降低。首先验证不公平特性,进而提出一种门限动态变化的Vegas改进算法。仿真结果表明,在异构网络中改进后的控制算法比原有算法能获得更高的吞吐量和更好的稳定性。TCP Vegas has a better performance in throughput and stability than TCP Reno in homogeneous networks,but performs much worse in heterogeneous networks where Vegas and Reno coexists.This is because TCP Reno has aggressive control mechanism,which makes Vegas fail in obtaining a fair share of the bandwidth.We first validate this characteristic of unfairness,and further propose an improved Vegas algorithm with dynamic threshold alternation.Simulation results show that the improved control algorithm achieves a higher throughput and better stability in heterogeneous networks than the conventional TCP Vegas.

关 键 词：Reno VEGAS 不公平性 异构网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]