中文摘要：

针对现有的高速公路事故消息发布方法存在时延大、传输速度慢等问题,结合车载环境无线接入方案,提出一种定向单跳车辆事故消息广播机制（DSHVB）。车辆节点通过建立与自身行驶方向相反的车辆节点列表,确定是否成为转发节点从而完成事故消息的定向转发。研究高速移动情况下车辆节点间事故消息的可靠转发条件,利用Veins仿真平台对DSHVB进行性能评估。实验结果表明,与泛洪广播机制相比,DSHVB的丢包率和网络负载更低、消息可靠性更高,能够满足高速公路事故消息快速广播的需求。

英文摘要：

Aiming at the problem of long time delay and slow transmission speed of accident message publication method on highway, this paper proposes a Directional Single-hop Vehicular Broadcast （DSHVB） mechanism combining the application with Wireless Access scheme Vehicular Environments（WAVE）. Each car node builds a car node list to record other cars driving in opposite direction, then accomplishes the directional accident message rebroadcast. It discusses the requirements to achieve reliable accident message forwarding and evaluates the performance of DSHVB using Veins. Experimental result shows that DSHVB has lower packet lost rate, higher quality of reliability and lower network load compared with flooding broadcast mechanism, and it meets the requirement of the fast broadcast of the accident message in highway scenario.