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Routing Protocol for VANET Based on Link Expiration Time Control

FENG Jiangpeng,ZHENG Liming   

  1. (Department of Electronic Engineering,College of Information Science and Technology,Jinan University,Guangzhou 510632,China)
  • Received:2014-09-15 Online:2015-05-15 Published:2015-05-15

基于链路持续时间控制的VANET 路由协议

冯江鹏,郑力明   

  1. (暨南大学信息科学技术学院电子工程系,广州510632)
  • 作者简介:冯江鹏(1989 - ),男,硕士研究生,主研方向:无线网络通信;郑力明,教授、博士。
  • 基金资助:
    广东省教育部产学研结合基金资助重点项目(2011A090200085);广东省教育部产学研结合基金资助项目(2012B091000046); 广东省战略性新兴产业发展专项基金资助项目(2011912010)。

Abstract: In Vehicular Ad Hoc Network(VANET),the high dynamic network topology caused by high-speed vehicle mobility leads to the frequent link fracture and unstable path. Aiming at this problem,a routing protocol for VANET based on the Link Expiration Time(LET) control is proposed. The vehicle builds a path which owns the same travel way and the longest LET. In the routing maintenance phase,the node sets a timer to trigger a new route discovery process for finding an effective link to form a new path. The vehicle increases the transmitting power to extend LET and enlarge the search range if it can not find out the efficient link,which will minimize the probability of fracture link. Compared with AODV and LED-AODV protocol,the simulation results show that the new routing protocol has an obvious improvement, which has the longer path expiration time,the less transmission delay,the higher average throughput and the more stable link.

Key words: Vehicular Ad Hoc Network(VANET), Link Expiration Time(LET), power control, forward direction, next hop node, routing protocol

摘要: 在车辆自组织网络中,车辆的快速移动会使网络拓扑呈现高动态性,造成链路频繁断裂、路径不稳定。针 对该问题,提出一种控制链路持续时间的路由协议。采用相同行驶方向且链路持续时间最长的节点组建路径,在 路由维护阶段,设置定时器提前触发路由寻路,找到可替代的有效链路组建新路径。如果未能找到有效链路,则在 链路两端节点增大发射功率,延长链路持续时间,扩大寻路搜索范围,最大限度减小链路断裂的概率。仿真实验结 果表明,与AODV 及LED-AODV 协议相比,该路由协议在路径持续时间、传输延迟和吞吐率方面性能较好,具有更 稳定的链路。

关键词: 车辆自组织网络, 链路持续时间, 功率控制, 同向转发, 下一跳节点, 路由协议

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