摘要： 在车辆节点高速移动的专用短程通信(DSRC)网络中易出现拓扑结构频繁变化和信道访问不公平等现象。针对该问题,在媒体访问控制层中,提出一种考虑信道生存时间的DSRC退避算法。该算法利用车辆节点间位置及速度的相互关系动态调整节点的竞争窗口,实现信道的有序竞争。实验结果表明,与传统的二进制指数退避算法相比,该算法在改善信道访问公平性及优化网络性能方面有较好的表现。

关键词: 专用短程通信, 车载网络, IEEE802.11p协议, 信道访问公平性, 退避算法

Abstract: In Dedicated Short Range Communication(DSRC) network,it has the phenomenon that the topology changes frequently and channel access has unfairness.Aming at the problem,a backoff algorithm for DSRC considering survival time is proposed in the media access control layer.This algorithm adjusts the congestion window of nodes by the relationships of position and velocity of vehicles,and makes the competition of channel access reasonable.Experimental results show that compared with the traditional binary index Backoff algorithm,this algorithm has better performance in channel access fairness and network optimization.

Key words: Dedicate Short Range Communication(DSRC), vehicular network, IEEE 802.11p protocol, channel access fairness, backoff algorithm

中图分类号: 

• TP391