高速公路VANET中的安全信息优化研究

Safety Message Optimization Study in the VANET of Highway

车辆自组织网络中的空分复用接入方案可有效地提高网络吞吐量与传递效率,但其具有节点隐藏的问题,对此提出了一种根据车辆密度自适应调节空分复用距离的控制算法。首先,每个车辆估算本地车辆密度,并与邻居车辆进行分布式的融合;然后,车辆根据车辆密度动态地调节空分复用距离,从而降低节点隐藏引起的信号干扰与数据包冲突;最终,使得空分复用距离与数据包接收率达到平衡。在每个蜂窝中,使用同步传输来提高空间与带宽的利用效率。仿真实验结果表明,该算法有效地降低了数据包冲突,提高了车辆自组织网络中空分复用接入方案的数据包传递率,并降低了端到端延迟。

Space division multiple access scheme in the vehicular ad hoc network could improve the network throughput and transmit efficiency perfectly, but it has hidden node problems, a control algorithm for adaptively changing the spatial reuse distance according to the vehicular density is proposed. Firstly, the density of vehicular is estimated by each vehicular and then the estimated results fusion is realized with its neighborhoods; Then, the spatial reuse distance is adjusted dynamically according to the vehicular density so that the signal interference and packet collision caused by hidden nodes is reduced; Lastly, the spatial reuse distance and packet receive rate is balanced. In each cell, the synchronization transmit is used to improve the utilization rate of space and bandwidth. Experimental results show that the proposed scheme reduces the packet collision, improves the packet transfer rate and reduces the end-to-end delay.