Abstract: Traditional TCP variants use packet loss as the indicator of congestion and reduce its congestion windows size, which results in TCP throughput degrade. This paper studies how WECN solves this problem and enhances performance over wired/wireless hybrid networks. The contribution of this paper is implement of WECN in Linux operating system and emulation of its combination with TCP Reno, TCP Westwood in a testbed. Test results show that WECN can be extended to current TCP variants and can improve TCP throughput in lossy links.

Key words: congestion control, Explicit Congestion Notification(ECN), Active Queue Management(AQM), Random Early Detection(RED), testbed

摘要： 针对传统拥塞控制机制在无线链路丢包的情况下出现的盲目降低拥塞窗口、TCP吞吐量下降的问题，研究无线/有线混合环境下基于该机制的一种丢包区分方法——WECN，在Linux操作系统下进行实现。搭建混合网络实验床仿真WECN与TCP Reno, TCP Westwood 2种协议相结合的网络模型。测试结果表明，WECN能扩展到已有的TCP协议中，提高含无线链路网络中TCP的吞吐量。

关键词: 拥塞控制, 显式拥塞通告, 主动队列管理, 随机早期检测, 测试床

CLC Number: 

• TP393