基于链路稳定度的车载网路由协议研究

摘要

针对车载网中节点移动速度快,拓扑结构变化速度快的特点,以及AODV协议广播式路由链路存活时间短、平均端到端时延大等问题,提出了一种通过计算链路稳定度的方式来改进AODV协议.在节点进行广播时,首先计算转发角度,然后,再将投影最长和链路生存时间最长作为综合选择条件,以此高效地选择路径相对较短以及链路相对稳定的路由.通过这种方式,改进后的AODV协议很好地解决了网络中链路易断裂的问题,提高了数据包的投递率,降低了平均端到端的时延.利用NS2仿真软件进行性能仿真,结果表明:改进后的AODV协议在包递率、平均时延和吞吐量方面优于传统模型.%Since vehicular network has characteristics such as node move fast,topology change rapidly,and AODV protocol broadcast-style routing has the problems such as short link survival time,long average end-to-end delay,a mode is proposed by calculating the link stability to improve AODV protocol.The new protocol choose shorter route and relatively stable routing efficiently by calculating angle forwarding considering two factors which are the longest projection and the longest link survival time when the node is broadcasting.In this way,the improved AODV protocol solves the problem of the network link fracture well,increases the packet delivery ratio and reduces average end-to-end delay.By using the NS2 network simulation software,the results show that the improved AODV protocol is superior to conventional model in packet delivery ratio,average end-to-end delay and throughput.