车联网时空协调竞争优化媒体访问控制协议  

SPATIOTEMPORAL COORDINATION AND COMPETITION OPTIMIZATION OF MEDIA ACCESS CONTROL PROTOCOL FOR INTERNET OF VEHICLES

作　　者：李丽君 刘鸿飞[2] Li Lijun;Liu Hongfei(School of Science,Chongqing University of Technology,Chongqing 400050,China;School of Artificial Intelligence,Chongqing Creation Vocational College,Chongqing 402160,China)

机构地区：[1]重庆理工大学理学院,重庆400050 [2]重庆科创职业学院人工智能学院,重庆402160

出　　处：《计算机应用与软件》2023年第3期193-200,共8页Computer Applications and Software

基　　金：重庆市教委科学技术研究项目(KJZD-K201805401,KJ1752485)。

摘　　要：为提高车联网环境下媒体访问控制(MAC)协议有效性,提出一种基于时空协调竞争优化的车联网媒体访问控制协议。利用联网车辆之间独特的时空特征,即车辆之间的几何关系构成一条碰撞线图,显示可能相互碰撞的车辆之间的关系,并提出无争用信道接入方案,通过使用定向天线和传输功率控制来同时交换安全消息;在城市道路布局的基础上,提出在路侧单元通信范围内考虑交叉口车辆到达率的最优争用时段安排策略,以减少车辆登记时间。仿真模拟表明,时空协调竞争优化媒体访问控制协议要优于选取的对比实验算法,验证了算法有效性。In order to improve the effectiveness of media access control(MAC)protocol in the internet of vehicles environment,this paper proposes a MAC protocol for internet of vehicles based on spatiotemporal coordination and competition optimization.Using the unique spatiotemporal characteristics of networked vehicles,that was,the geometric relationship between vehicles formed a collision line graph,the relationship between vehicles that might collide with each other were showed.An uncontested channel access scheme was proposed,which exchanged safety messages through the directional antenna and transmission power control.Based on the urban road layout,an optimal contention period arrangement strategy was proposed that considered the arrival rate of vehicles at intersections within the communication range of roadside units,so as to reduce vehicle registration time.The simulation results show that the spatiotemporal coordination competition optimization MAC protocol is superior to the selected comparative experimental algorithm,which verifies the effectiveness of the algorithm.

关 键 词：车联网 时空协调 竞争优化 媒体访问 MAC协议 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]