分布式VANETs中车流自适应的低冲突TDMA-MAC协议  

A traffic adaptive and low collision TDMA-MAC protocol in distributed VANETs

作　　者：程凯 张信明[1] Cheng Kai;Zhang Xinming(School of Computer Science and Technology,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学计算机科学与技术学院,安徽合肥230026

出　　处：《信息技术与网络安全》2022年第6期84-93,共10页Information Technology and Network Security

基　　金：国家自然科学基金(62072425)。

摘　　要：在分布式车载自组织网络中,动态变化的双向车流会严重影响基于slot分组的TDMA-MAC协议降低冲突的效果以及整体协议的安全性与可靠性,对此设计一种车流自适应的低冲突TDMA-MAC协议TALC-MAC。采用slot占用率作为分组调整的判断依据,设计详细的分组扩展与收缩策略以适应车流实际分布。同时优化帧内slot分组方案与节点预约slot的策略,进一步降低网络中发生冲突的概率。仿真实验结果表明TALC-MAC能有效适应双向车流的动态变化,保持协议整体低冲突的特性。In distributed vehicular ad hoc networks,the dynamically changing two-way traffic flow seriously affects the collision reduction effect of Time Division Multiple Access based Medium Access Control(TDMA-MAC)protocol using the slot grouping scheme,and the security and reliability of the overall protocol.To this end,a traffic adaptive and low collision TDMA-MAC protocol,named TALC-MAC,is designed.The slot occupancy rate is used as the judgment basis for group adjustment,and a detailed group expansion and contraction strategy is designed to adapt to the actual distribution of traffic flow.The intra-frame slot grouping scheme and the node reservation slot strategy are optimized to further reduce the probability of collision in the network.The simulation results show that TALC-MAC can effectively adapt to the dynamic changes of two-way traffic flow,and maintain the low-collision characteristic of the protocol.

关 键 词：TDMA机制 slot占用率 融入冲突率 车载自组织网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]