MANET TCP-Vegas跳数自适应算法的设计与实现  

DESIGN AND IMPLEMENTATION OF MANET TCP VEGAS-HOPS ADAPTIVE ALGORITHM

作　　者：黄立[1] 陆建德[2] 

机构地区：[1]苏州大学计算机科学与技术学院,江苏苏州215006 [2]江苏省计算机信息处理技术重点实验室,江苏苏州215006

出　　处：《计算机应用与软件》2012年第3期39-41,51,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(61070170)

摘　　要：TCP Vegas是为有线网络设计的一种拥塞控制算法,在MANET下使用存在诸多问题。提出一种在MANET环境下提高TCP Vegas性能的新算法TCP Vegas-HA(TCP Vegas-Hops Adaptive),该算法通过测试获取一组不同跳数和节点缓存下的最优阈值作为经验值,在新的拥塞控制算法中引入跳数自适应机制,并针对路由改变时往返时间最小值baseRTT无法精确测量的问题,提出新的利用经验值的测量方法。对算法仿真执行的结果表明,该算法对网络环境的变化具有良好的适应性,能有效提高TCP Vegas在MANET中的吞吐量。TCP Vegas is a kind of congestion control algorithm designed for wired network environment,but it has many problems in MANET application.This paper presents a new algorithm named TCP Vegas-HA（TCP Vegas-Hops Adaptive） to improve the performance of TCP Vegas in MANET.This algorithm tests and obtains a group of optimal threshold value in different number of hops and node caches and uses them as empirical values,and introduces hops adaptive mechanism to new congestion control method.Also for the issue that the minimum round-trip time（baseRTT） can not accurately measure when the router changes,we present a new measurement method using these empirical values.Results of the simulation on the algorithm show that it has great adaptability against the variation of mobile network,and can effectively increase the TCP Vegas throughput in MANET.

关 键 词：MANET TCP VEGAS 经验值 往返时延 跳数自适应 节点缓存 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]