摘要
在异构无线网络中存在高误码、切换、信号衰落等链路特性,使传统的TCP拥塞控制机制受到了挑战。在不增加开销的情况下,基于丢包检测、RTT时间和ACK返回速率三重判决,提出了一种新的TCP拥塞控制机制(TCP-H)。仿真结果表明,TCP-H增强了对拥塞和随机差错的区分能力,满足公平性要求,改进的最小RTT计算方法解决了在低延迟向高延迟网络切换的时Vegas,Westwood等算法存在的最小RTT更新问题,有效提高了在异构无线网络环境下TCP的性能。
The application of TCP over heterogeneous wireless networks is a challenging work due to high bit error rates, fading channels and handoff. Combined with the triple decisions of packet loss detection, the estimation of RTT and the rate of ACK, a new TCP congestion control mechanism （TCP-H） was proposed for heterogeneous wireless networks. The simulation results show that TCP-H can strengthen the capability to distinguish congestion and random errors, and has a good fairness. TCP-H succeeded in solving the problems that Vegas and Westwood had when networks handoff from low-latency to high-latency, with improved minimum RTT calculation method. TCP-H can improve the performance of the heterogeneous networks efficiently.
出处
《数字通信》
2009年第3期32-36,共5页
Digital Communications and Networks
基金
科技部国际科技合作重点项目(2008DFA12110)
国家自然科学基金项目(60702055)
