基于路由生命期的动态源路由协议

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,使得如何提高路由可靠性成为无线Ad hoc网络路由协议研究的主要目标之一.在动态源路由协议(Dynamic Source Routing,以下简称DSR)基础上提出一个新的基于路由生命期估计的Ad hoc网络路由协议,REBDSR(Route-lifetime Estimation Based Dynamic Source Routing).该协议通过对链路状态预测估计路由生命期;路由发现算法同时使用路由生命期、路由跳数作为路径选择参数;当路由上的链路进入危险期后,启动主动式路由维护机制,发送路由失效警告以保证快速路由切换.REBDSR还以路由生命期为超时值进行路由缓存管理,解决了DSR路由缓存中存在较多过时路由的问题.大量仿真实验表明:在网络中载和重载情况下,REBDSR协议的整体性能要优于DSR协议,特别是在节点运动频繁的网络中,REBDSR协议的性能优势更为明显.

Route-lifetime Estimation Based Dynamic Source Routing

Since frequently moving of nodes in the wireless ad hoc networks and instability of wireless channel,how to improve the route reliability becomes one of the main research subjects in such networks.In this paper,a new routing protocol,named as Route-lifetime Estimation Based Dynamic Source Routing(REBDSR),based on DSR,was proposed.REBDSR improve the route reliability in terms of estimations of link and route residual lifetime,During the route discovery,the policy of route selection of REBDSR depends on both route hops and the predicted route residual lifetime;proactive route maintenance algorithms predict whether or not the route is in risk condition and send route warning message to ensure route switch before the old route is actually broken. Besides,a new route cache management module is added to DSR,in order to alleviate the influence of stale route.A lot of simulation results demonstrate that the performance of REBDSR is superior to that of DSR when network is in moderate and heavy load condition,especially when nodes are in frequent motion.