GEO卫星网络中基于带宽估计的Vegas算法研究

主要针对SCPS-TP协议中Vegas机制在大带宽时延积的卫星网络中,存在慢启动阶段结束过早、拥塞窗口过小,以及拥塞避免阶段窗口增长方式过于保守等问题,提出了一种改进的Vegas拥塞控制算法.该算法通过修订窗口增长速率因子ρ和判决因子D,并利用带宽估计来判断慢启动结束时机.仿真结果表明,该算法能使窗口大小迅速接近最大带宽时延积,从而提高了链路利用率.

Research on Vegas algorithm based on bandwidth estimation in GEO satellite network

This article mainly aims at solving problems of prematurely ended in the slow start stage, the congestion window being too small and the growth pattern of congestion avoidance stage window being too conservative, etc in SCPS-TP protocol exist in space network with large bandwidth delay product. And improved Vegas congestion control algorithm is proposed through revising the window growth rate factor （ρ） and the judgment factor （D） and using the bandwidth estimation to judge the ending time of slow start. The simulation results show that this algorithm can make the size of window rapidly approach the maximum bandwidth delay product within a short time period and improve link utilization.