Improvement of Wireless TCP Based on Bandwidth Estimation and ECN
Han Hu · Jisuanji gongcheng · 2010
In wireless environment,TCP responds to all losses by invoking congestion control algorithm resulting in degraded end-to-end performance.Aiming at this problem,this paper proposes a method of wireless TCP based on bandwidth estimation and Explicit Congestion Notification(ECN).The data sender adopts available bandwidth estimation algorithm in order to optimize congestion window,and cooperates with the router which is configured with the function of explicit congestion notification to distinguish the characteristics of packet losses.The sender takes advantage of SACK option to speed up recovery of congestion window when multi-packets losses are occurred.Simulation results show that the throughput of modification of TCP outperforms TCP_SACK by 30%,and TCP_Reno by 52%.