基于TCP Veno算法的异构网络边界代理改进机制研究

摘要

针对在异构网络环境下无线网络的特点使TCP性能下降的问题,借鉴TCP Veno算法原理,提出基于网络状况评估的拥塞控制的性能增强代理改进工作机制,动态评估当前网络的状况,调整预应答发送窗口的阈值,提高性能增强代理在较大差异网络下的传输控制效能.基于NS-2的网络仿真测试对算法进行了验证,结果显示改进后的工作机制在丢包率较大的异构网络中性能有明显提升.%The TCP performs poorly in a heterogeneous network environment due to characteristics of the wireless network.In order to solve this problem,improved mechanism of Performance Enhancing Proxy is put forward.This mechanism is based on“congestion control according to network conditions”.The threshold value of Pre ACK sending window is adjusted according to dynamic assessment of the status of the current network.The transmission control performance of Performance Enhancing Proxy is improved markedly in a large differences network status.This Algorithm is confirmed by the NS-2 network simulator tests.The results show that the performance in improved mechanisms is improved significantly.