基于协作组播的VANETs安全消息传播方案

Cooperative multicast based disseminating safety message scheme for VANETs

车辆高速移动以及信道衰落给安全消息的传递提出了挑战。为此,提出基于协作组播的安全消息传播方案CMDSM(cooperative multicast based disseminating safety message)。利用ETX估计信道质量,分别构建能接收安全消息的节点PHNs和不能接收安全消息的节点PDNs;建立选择协作组播节点的模型,利用整数线性规划算法找到最优的协作组播节点,由协作组播节点向PDNs组播安全消息,提高安全消息率。仿真结果表明,相比D-TDMA协议,CMDSM方案有效提高了安全消息传递率。

In vehicular Ad-Hoc networks（VANETs）,the presence of high relative mobility and channel fading poses technical challenges.Therefore,cooperative multicast based disseminating safety message（CMDSM）scheme for VANETs was proposed.The channel quality was estimated using ETX,and the set of nodes with receiving safety message and the set of nodes with non-receiving safety message were constructed.The model with cooperative multicast node was derived,and the optimal cooperative multicast node was selected through integral linear programming.Cooperative multicast node transmitted safety message towards nodes with non-receiving safety message,to improve the delivery safety message ratio.The simulation results show that CMDSM outperforms D-TDMA in terms of the packet delivery ratio of safety messages.