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在车载Ad hoc网络中,广播的可靠性与低传输延时对安全应用至关重要。然而由于链路的不可靠性,广播消息可能不能被发送方所有的邻居接收。传统的基于接收方的广播协议,候选节点的等待时间是基于距离或者距离与链路质量,但是忽略车辆的分布情况。在本文中,我们关注于车载网中基于接收方的快速可靠广播协议,综合考虑了距离,链路质量以及车辆的分布来选择广播的中继节点。最可靠的候选节点优先转发消息提升广播的性能。仿真实验结果表明,文章提出的协议能够保证高可靠性的基础上具有较低的广播时延。
In automotive Ad hoc networks, the reliability of broadcasts and the low transmission delay are critical to safety applications. However, due to the unreliability of the link, the broadcast message may not be received by all the neighbors of the sender. In traditional receiver-based broadcast protocols, the waiting time of candidate nodes is based on distance or distance and link quality, but the distribution of vehicles is ignored. In this paper, we focus on the receiver-based fast and reliable broadcast protocol in car network, and consider the distance, link quality and vehicle distribution to select the broadcast relay node. The most reliable candidate nodes give priority to forwarding messages to improve broadcast performance. The simulation results show that the protocol proposed in this paper can guarantee high reliability and lower broadcast delay.