一种基于HSTCP改进的公平性算法  

An Improvement Fairness Algorithm Based on HSTCP

作　　者：刘文远[1] 信春雷[1] 龙承念[2] 关新平[2] 

机构地区：[1]燕山大学信息工程学院,河北秦皇岛066004 [2]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《小型微型计算机系统》2008年第1期31-34,共4页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(60404022)资助;国家杰出青年科学基金项目(60525303)资助

摘　　要：在高速网络中现有的标准TCP不能充分的利用网络带宽,HSTCP(HighSpeed TCP)作为解决这一问题的可行方法被提出.试验表明HSTCP比标准TCP能够更充分的利用带宽,但存在着严重的RTT不公平性.首先通过仿真试验和数学分析对HSTCP的RTT不公平性进行研究,然后在原有算法的基础上添加一个公平性因子来降低由于RTT不同造成的窗口增长差异.试验表明改进算法有效保证了HSTCP流的带宽公平性、降低了丢包率.Current TCP congestion control cannot achieve enough bandwidth in high-speed networks, HSTCP （High Speed TCP） has been proposed as one of the possible ways to solve this problem. Experiments revealed that HSTCP can use the bandwidth more sufficient than current TCP, but it has severe RTT unfairness. In this paper, we first investigate the RTT unfairness through mathematical analysis and simulation studies, and then we add a fair factor to the HSTCP to decrease the difference of window increase caused by different RTT. Experiments show that the modified algorithm can guarantee the bandwidth fairness of HSTCP flows and reduce the packets loss rate.

关 键 词：TCP 拥塞控制 HSTCP 公平性 高速网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]