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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。
Due to frequent changes in the topology of wireless Ad hoc networks and the instability of wireless channels, frequent routing failures result in serious impact on TCP performance. To this end Dynamic Source Routing Protocol (Dynamic Source Routing, hereinafter referred to as DSR) has been improved. Mainly includes: Through the link state prediction to determine the route on the route into the dangerous period; the use of active route maintenance mechanism and strive to be in the routing failure before the rapid routing switch. A large number of simulation experiments show that the improved DSR can effectively improve the TCP transmission performance, especially in the network with frequent node movement.