一种改进的TCP Westwood算法  

An improved algorithm of TCP Westwood

作　　者：赵宇红[1] 刘海良[1] 张晓琳[1] 

机构地区：[1]内蒙古科技大学信息工程学院,内蒙古包头014010

出　　处：《微型机与应用》2015年第15期63-66,共4页Microcomputer & Its Applications

摘　　要：无线网络存在高误码率、带宽变化大等特点,针对丢包类型多样化、拥塞控制中参数设置既盲目又单一化等问题,提出了一种TCP Westwood(简称TCPW)的改进算法TCP-NW,该算法根据网络中带宽的利用率来区分丢包类型并细化拥塞情况,并据此对CWND(拥塞窗口)和SSTHRESH(慢启动门限值)值进行调整。仿真实验表明,TCP-NW算法在网络时延、抖动、吞吐量等方面表现稳定,对于无线网络TCP的传输性能有较大的改善。Due to the high error rate and the serious variation of bandwidth in wireless network, aiming at the problem that losted package type diversification and parameter setting is both aimless and simplification in congestion control, this paper proposed TCP-NW which is the improved algorithm of TCP Westwood（TCPW）. The algorithm distinguished the type of packet loss according to the utilization of the network bandwidth and refined the congestion situation, and modulated the value of CWND（congestion window） and SSTHRESH（slow start threshold value）. The simulation experiments show that the TCP-NW algorithm has a stable performance in the aspects of network delay, jitter, throughput and so on, has greatly improved the transmission performance of TCP in wireless network.

关 键 词：无线网络 带宽估计 拥塞控制 网络仿真 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]