VANETs中基于链路的可持续时间的路由方案

车载网VANETs中的车间通信V2V(vehicle to vehicle)有利于车辆信息的共享、提高交通安全;然而,在VANETs中,车辆快速移动、车辆分布不均匀以及拓扑结构动态变化等特性,导致车辆间通信链路断裂频繁、路由稳定性差、车间通信V2V数据传输效率低.为此,以车辆间通信链路的可持续时间为选择路由指标,择优选取可持续时间长的链路组建路由.从而提高路由的稳定性.利用车辆的实时移动信息,包括移动速度、移动方向以及位置估计链路的可持续时间;同时,车辆周期地广播路由表,邻居节点利用收到其他节点的路由表更新自己的路由表,通过这种方式使车辆共享实时的链路信息.仿真结果表明,提出的路由方案有效地提高数据传输速率、降低了端到端传输时延,并提升了吞吐量.

Link-sustainable time-based routing in Vehicular Ad Hoc Networks

Vehicle to Vehicle (V2V) communication in Vehicular Ad hoc Networks (VANETs) make for sharing information between vehicles, and improve the traffic safety. However, in VANETs, vehicles with fast moving, uneven distribution, and dynamic topology result in Link fracture frequently in V2V communication, and reduce the stability of routing. Therefore, consider to the link-sustainable time, which is chose as the indicator to decide the routing, which consists of the link with long link-sustainable time. By this way, the stability of routing is improved. Mobility information, including speed ,direction and position is used to estimate link-sustainable time. At the same time , vehicle broadcast the router table. Using the received router table from neighbors, vehicles update their routing table, by this way, vehicle share the link information in real time. Simulation results show that the proposed routing scheme improves the packet deliver ratio, reduce the End to End delay, and improve the throughputs.