基于PC辅助机制的高效VANET路由协议

EFFICIENT VANET ROUTING PROTOCOL BASED ON PC ASSISTANT MECHANISM

针对车载自组网络(VANET)中传统的被动聚类(PC)机制没有考虑车辆特性和链路质量而导致分组投递率非常低的问题,提出一种基于被动聚类辅助机制的高效VANET路由协议。首先,选择合适的节点作为簇首节点或网关,在路由发现阶段转发路由请求包;然后,通过采用一种基于节点度数、预期传输计数和链路生存周期的多度量选择策略评估节点的适合性;最后,当发现一个路由时目标节点回复路由请求包到源节点,并通过该路由路径的数据确认是否传输成功。针对路径发现率、网络吞吐量、路径生存期、分组投递率及加权因素影响的仿真实验验证了所提路由协议的可靠性及高效性。仿真结果表明,相比传统的PC机制,所提路由协议不仅提高了路由发现成功率,还明显提高了分组投递率和网络吞吐量。

For the issue that traditional passive clustering（ PC） mechanism in vehicular ad hoc network（ VANET） does not consider vehicle characteristics and link quality,which causes very low packet delivery ratio,we propose an efficient VANET routing protocol,which is based on passive clustering assistant mechanism. First,it selects appropriate nodes as the clustering head node or gateway and forwards routing request packet in the stage of routing finding. Then,it employs a multiple metrics selection strategy based on node degree,expected transmitting count and link lifetime to assess the suitability of nodes. Finally,when a routing is found,the object node replies the routing request packet to its source node,and verifies whether the transmission is success by the routing path data. The simulation experiments targeted at the routing finding rate,network throughput,path lifetime,packet delivery ratio and impact on weighted factors have verified the reliability and efficiency of the proposed routing protocol. Simulation results show that compared with traditional PC mechanism,the proposed protocol improves the success rate of routing finding,besides,it also raises the packet delivery ratio and network throughput noticeably.