For the reason that the MAC layer of the IEEE 802.1 lp protocol lack of sufficient support for vehicle mobility in VANET,this paper investigated the adaptive mobility mechanism for the MAC layer of IEEE 802.11 p protocol.Firstly,it constructed a VANET communication scenario.Secondly,it proposed a P-persistent CSMA / CA mechanism and a dynamic priority management mechanism based on the number of neighbors and the relative speed of nodes respectively.Finally,it constructed a test scenario based on the Veins simulation platform and simulated the proposed improvement mechanism.Test results show that the proposed two mechanisms can significantly improve VANET network performance,as they can effectively increase the system throughput,reduce packet loss,reduce the average data transmission delay and the average number of data retransmission.%针对VANET环境下标准IEEE 802.11p协议的MAC层对车辆移动性因素支持不足的问题,对IEEE802.11p协议MAC层自适应移动性机制进行了研究.首先,构建了一种VANET通信场景;然后,基于构建的通信场景,分别基于节点邻居数量和节点相对速度提出了一种P持续CSMA/CA机制和一种基于节点相对速度的动态优先级管理机制;最后,基于Veins仿真平台构建了测试场景,并对提出的改进机制进行了仿真测试.测试结果表明,提出的两种机制能够有效增加系统吞吐量,减少丢包数量,降低平均数据传输延迟和平均数据重传次数,显著提升了VANET网络性能.
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