VANET中一种基于概率转发的AODV路由协议

泛洪被作为实现广播通信的最简单的技术,广泛应用于车联网VANET(vehicular Ad Hoc network)路由.然而,由于VANET中节点的快速移动以及网络拓扑动态变化,简单的泛洪容易导致大量的冗余数据包,并引发广播风暴.为此,以典型的按需式距离矢量路由协议AODV (Ad Hoc on-demand distance vector)为基础,提出基于概率转发的AODV路由协议,记为AODV_P.AODV_P协议利用概率转发机制替代AODV中的泛洪.节点利用距离、密度信息计算转发概率,并依据转发概率设置计时器.计时器时间越短,成为下一跳转发节点的可能性越大.仿真结果表明,提出的AODV_P能够有效降低冗余数据包,缓解广播风暴问题.与AODV协议相比,AODV_P在传输时延、数据包传输率方面得到了有效提高.

A Probabilistic Forwarding-Based AODV Routing Protocol in VANET

Flooding is the simplest technique to achieve broadcast communications and it is widely used in many existing routing protocols for vehicular Ad Hoc network(VANET).However,due to dynamic topology and high-speed mobile,flooding results in lots of redundant packets and broadcast storm problem.Therefore,a routing protocol marked as AODV_P is proposed which is based on the well-known Ad-Hoc on demand distance vector(AODV) routing protocol and using the probabilistic forwarding to replace the flooding mechanism.Each node estimates the forwarding probability based on distance and density.Then node sets times by forwarding probability.The shorter time is that the more chance of next-hop forwarding node.The simulation results show that the proposed routing protocol reduces the redundant packets and mitigates the broadcast storm problem.Compared with AODV,AODV_P outperforms in terms of delay and packet delivery ratio.