基于自适应选路策略的VANETs路由协议

摘要

Based on the characteristics of VANET, we present a VANETs routing protocol named as ASVP, which is based on adaptive routing strategy. Aiming at the frequent interruption property of link in VANETs, the carry-forward mechanism is introduced to protocol to make it be able to adapt to the intermittent connected delay tolerant networks. Through analysing and calculating the road model, we get the connectivity metric index of road sections, which is used to select the optimal route. Based on the road topology, the protocol divides the process of information transmission into straight mode and intersection mode, and the comparative analysis is made on boundary mode of VANETs for whether necessary or not; the auxiliary facilities will be used in intersection mode to forward the packets. Simulation results show that ASVP has certain advantages in delay and delivery rate in its application in urban scene.%基于车载自组织网络特性,提出一种基于自适应选路策略的VANETs路由协议ASVP.协议针对VANETs的链路频断性,引入携带-转发(carry-forward)机制,使协议能够适用于间断性连接的延迟容忍网络.通过对道路模型分析计算,获得路段连通性度量指标,用于选取最优路径.协议基于道路拓扑将数据包的转发过程分为直路模式和路口模式,并对比分析VANETs中边界模式是否有必要性,路口模式下采用辅助设施进行转发.仿真结果表明,ASVP应用于城市场景中在时延和投递率方面有一定的优势.