对TCP Westwood算法的改进研究  

Improvement of Algorithm for TCP Westwood

作　　者：杨晓萍[1,2] 王瑞[1] 狄特 牛超[1] 

机构地区：[1]吉林大学通信工程学院,长春130012 [2]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（信息科学版）》2015年第3期223-229,共7页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金重点基金资助项目(61034001);吉林省科委重点科技攻关基金资助项目(20140204087GX)

摘　　要：针对Westwood算法无法区分无线随机丢包和网络拥塞丢包的问题,提出了一种改进的Westwood-c算法。在原算法基础上加入丢包区分机制和改进加性增长机制,即通过对比积压报文数N与设定的门限值β,对拥塞窗口Pcwnd进行设置,使网络吞吐量保持在较高水平,从而提高网络资源利用率。在NS-2(Network Simulatorversion-2)仿真环境下,将Westwood-c算法与Westwood算法在不同场景下的吞吐量进行对比实验的结果表明,Westwood-c算法的吞吐量有显著提高。Because Westwood algorithm can not distinguish wireless random packet loss and network congestion packet loss, we propose an improved algorithm Westwood-c, add the packet loss distinguish mechanism and improve the additive increase mechanism on the basis of the original algorithm, The paper sets congestion window Pcwnd by comparing the backlog beta message number N and setting value β of threshold making the network throughput maintain a high level, improving the network resource utilization. In NS-2 （Network Simulatorversion-2） simulation environment, comparing with the throughput of Westwood-c algorithm and Westwood algorithm under different scenarios. The results show that the Westwood-c algorithm throughput has increased significantly.

关 键 词：TCP协议 TCP Westwood算法 网络拥塞 无线网络 NS-2 

分 类 号：TN92[电子电信—通信与信息系统]