一种Ad hoc网络按需路由协议的设计

Design and performance analysis of a routing protocol based on path stability in ad hoc network

Ad hoc网络中节点移动,网络拓扑不稳定,特别是对于节点高速移动的Ad hoc网络来说网络性能下降问题更为突出。为此,设计了一种基于路径稳定率的按需路由的协议,新协议选择源目节点间稳定性高且跳数少的路径进行数据分组的转发,以经典的按需路由协议AODV为原型,并在此基础上进行改进,扩展为PS-AODV(Path Stability AODV)。性能分析的结果表明,在节点高速运动的重负载Ad hoc网络中,该协议显著减少了中断路由的修复时间,提高了端到端分组投递率,在端到端传输时延相近的情况下显著改善端到端时延抖动,对于那些时延敏感的应用有重要的参考价值。

Node movement is a significant constraint in mobile ad hoc networks, due to its effect on rapid topology changing. The performance decrease could be even worse in the case of highly moving scenes. In order to reduce the uncertain factors in mobile ad hoc networks, we propose a new protocol based on path stability. Only the path which has the highest ratio of stability is selected as the best way to forward packet. Modification has been made to original AODV to create PS-AODV （Path Stability AODV）. Simulation results show that PS-AODV significantly reduces path repair cost, increases packet forward ratio; the jitter of end to end packet delay sharply decreases with approximately equal packet delay. Those time-sensitive application would most benefit from this new method.