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针对车载自组网具有节点移动速度快、网络拓扑变化频繁的特点,在现有的GPSR协议基础上进行改进,提出了基于速度-密度模型的改进路由协议GPSR-SD。该协议结合速度-密度模型,对行驶该车辆节点所在路段的车辆密度值进行估算,在路由选择过程中综合考虑车辆节点的行驶速度和车辆密度信息值两个因素来选择下一跳转发节点,进而提高转发节点选择的正确性来增加通信链路可靠性,从而减小了节点移动过程中所产生的空洞现象问题,提高了平均封包送达率,有效地降低了平均端到端的时延。通过NS2平台仿真对比试验,验证了GPSR-SD具有较好的性能。
Aiming at the characteristics of in-vehicle ad hoc networks that the node moves fast and the network topology changes frequently, this paper improves on the existing GPSR protocol and proposes an improved routing protocol GPSR-SD based on the speed-density model. According to the speed-density model, this protocol estimates the vehicle density of the road segment where the vehicle node is located. During the route selection process, the next-hop forwarding node is selected by taking into account both the vehicle speed and the vehicle density information , Thereby improving the correctness of the selection of the forwarding nodes to increase the reliability of the communication link, thereby reducing the hole phenomenon generated during node movement, improving the average packet delivery rate and effectively reducing the average end-to-end delay . Through NS2 platform simulation comparison test, it is verified that GPSR-SD has better performance.