摘要： 分析标准慢启动算法应用于包含GEO卫星链路的网络时存在的问题，提出一种基于RTT公平性的TCP慢启动改进算法。改进算法采用大初始窗口机制，慢启动初期窗口保持指数增长，慢启动后期引入窗口增长控制因子，使RTT较大的窗口增加较快，反之增加较慢。性能分析和仿真结果表明，改进算法可以在慢启动后期减缓拥塞窗口的增长速度，削弱RTT较小的TCP流竞争带宽的侵略性，在一定程度上保证不同RTT数据流共享带宽的公平性。

关键词: GEO卫星网, 拥塞控制, RTT公平性

Abstract: Thi paper analyzes the problems in standard TCP slow start algorithm when it is applied to the network environment including GEO satellite links. To solve these problems, a new improved TCP slow start algorithm based on RTT fairness is proposed, termed RFB-SS. RFB-SS algorithm uses the larger initial window mechanism. And in the early slow start phase, the congestion window remains exponential growth, in the late phase, by using window control growth factor, the congestion window of larger RTT increases faster, otherwise increases slower. Performance analysis and simulation results show that RFB-SS algorithm slows down the congestion window growth rate, and weakens the TCP flow of smaller RTT in the aggressive bandwidth competition in the late slow start phase. To a certain extent, RFB-SS algorithm obtains a fair sharing of available bandwidth among different RTT flows.

Key words: GEO satellite networks, congestion control, RTT fairness

中图分类号: 

• TP393