【摘要】 提出了一种将反应式路由协议和先应式路由协议结合在一起的抢先式Ad Hoc网络的路由算法.如果接收分组的能量小于危险阈值,则计算该链路的有效时间.如果估算的链路有效时间小于反应时间,则在链路失效前寻找局部替换路由,并用发现的局部路由替代当前即将失效的链路.保证节点的数据传送不受影响.将该算法应用于AODV协议,通过ns-2仿真,并将仿真结果和AODV协议比较,本算法在网络中负载较重的情况下明显降低了报文的传输时延,减少了路由失效数,提高了Ad Hoc网络的性能.更多还原

【Abstract】 A routing algorithm for Ad Hoc Networks associating reactive and proactive proto- cols,called preemptive algorithm,was proposed.The network nodes estimated valid duration of the link when the received signal strength was below the dangerous power threshold.If the esti- mated valid time was less than the response time,finding an alternative local route was triggered and the to-be-broken route was substituted before the dangerous link was broken.The simulation result shows the extended AODV protocol with the preemptive algorithm proposed significantly reduces the number of lose packets due to the broken paths,decreases the packet delivery delay in the situation of heavy traffic.更多还原