基于活跃度和任务的目标导向VANETs路由算法

针对车载自组织网络(VANETs)中节点移动速度快、节点任务分布不均、网络拓扑结构不稳定等特点,提出了一种基于节点活跃度和任务的目标导向VANETs路由算法GATRA(goal-oriented routing algorithm based on activity and task)。该算法根据当前运动节点的运动方向与目标节点的关系,以及任务饱和程度,综合考虑采用消息携带还是转发策略,以节约传输平均时延。在选择中继节点时,综合考虑邻接节点的位置、运动速度和方向等影响因素,设计节点活跃度的计算方法,作为选择中继节点的策略,从而提高了消息传输的成功率。仿真结果表明,与当前典型的VANETs路由算法相比,GATRA算法在传输成功率和平均延迟时间上具有较大提升。

Activity and Task Based Goal-oriented Routing Algorithm in VANETs

Nodes move rapidly and their tasks are unevenly distributed,the topology of network is instable in the vehicular ad-hoc networks. A goal-oriented routing algorithm (GATRA)is proposed based on activity and task. The algorithm chooses the carrying or forwarding of the messages,according to the saturation level of its task and the relationship between the movement direction of the current node and the target node. It can save mean delay time. When selecting a relay node,the computation of the node activity is designed as selection policy of the relay node,according to the impact factors such as the location,velocity and direction of the adjacent nodes. Hence,it can improve the success rate of message transmission. In the end,the simulation results show that compared with other typical routing algorithms,GATRA can performs better on transmission rate and mean delay time.