一种改进Ad hoc网络中TCP性能的方法

An Improvement of TCP Performance on Ad hoc Networks

由于无线Ad hoc网络拓扑结构的频繁变化以及无线信道的不稳定,导致频繁的路由失效,这给TCP性能带来严重影响。为此对动态源路由协议(Dynamic Source Routing,以下简称DSR)进行了改进。主要包括:通过对链路状态预测估计决定路由上的链路是否进入危险期;使用主动式路由维护机制力争在路由失效前进行快速路由切换。大量仿真实验表明,改进的DSR能有效改善TCP的传输性能,特别是在节点运动频繁的网络中。

The frequent route breakage, caused by frequent mobility of nodes in wireless ad hoc networksand instability of wireless channel, brings about severe performance degradation of TCP. In this paper, an improvement on DSR was proposed, in which prediction of the link state was introduced. In erms of the prediction, the decision of whether or not the route is in risk can be made and proactive route maintenance algorithms can do fast switching of route before route broken. A lot of simulation was made, and the results demonstrate that improved DSR can enhance TCP performance effectively, especially when nodes are in frequent motion.