城市车载网络中基于车流分布的机会路由

Traffic distribution based opportunistic routing for urban VANETs

针对车载网(vehicular Ad Hoc networks,VANETs)城市场景,提出基于车流分布的机会路由(traffic distributionbased opportunistic routing,TDOR),从十字路口选择和节点选择两个环节优化数据传输路径。在十字路口选择阶段,计算效用函数,选择效用函数最大的路口作为数据传输的方向;在下一跳节点选择阶段,利用预测的车辆行驶路径信息产生候选转发节点,计算候选转发节点的权值,将最大权值的节点作为下一跳的转发节点。仿真结果表明,TDOR协议提高了数据包传输率,降低了端到端传输时延。

For urban VANETs(vehicular Ad Hoc networks),traffic distribution based opportunistic routing(TDOR)in urban VANETs was proposed.TDOR protocol was designed as a two-phase algorithm,namely intersection selection phase and next hop selection phase,which improved the path.In intersection selection phase,utility function was computed,and intersection with maximum utility function was considered to transmit data.In next hop selection phase,the candidate forwarding nodes were induced by predicted vehicle path information,and the weights of candidate forwarding nodes were computed,and the node with maximum weight was chose to be the next-hop forwarding node.Simulation results show that the data delivery ratio of TDOR protocol is improved,and end-to end delay is reduced.