基于分布式反馈的C-V2X碰撞解除与重传机制  

C⁃V2X collision resolution and retransmission mechanism based on distributed feedback

作　　者：王致远 张陶冶 郭志斌[2] 邱佳慧[2] 张菊[1] 苏昭阳 刘留[1] WANG Zhiyuan;ZHANG Taoye;GUO Zhibin;QIU Jiahui;ZHANG Ju;SU Zhaoyang;LIU Liu(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Intelligent Network&Innovation Center,China United Network Communications Group Co.,Ltd.,Beijing 100048,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中国联合网络通信集团有限公司智网创新中心,北京100048

出　　处：《南京邮电大学学报（自然科学版）》2023年第5期41-50,共10页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金重点项目(61931001)资助项目。

摘　　要：蜂窝车联网(Cellular Vehicle-to-Everything,C-V2X)系统中,针对调度算法不合理而造成的资源碰撞问题,提出一种基于分布式反馈的碰撞解除与丢包重传机制。该机制将C-V2X终端视为网络中的分布式节点,在各节点对周围碰撞进行识别的基础上,利用节点间的反馈信息进行碰撞的解除与恢复。首先终端依据设置的条件识别周围发生的碰撞事件,并在其传输中反馈观察到的碰撞事件。然后碰撞终端根据接收的反馈消息更换或保留资源,从而实现碰撞解除和资源协调。最后为了保证信息更新的实时性,解除碰撞的终端将发生碰撞的数据进行重传。仿真结果表明,与3GPP标准方案相比,在严重拥塞(300 veh./km)情况下所提出机制的数据包接收率提升约13%,数据包更新时延降低约200 ms,有利于满足车联网信息交互的高可靠低时延需求。Aiming at the resource collision caused by the unreasonable scheduling algorithm in the cellular vehicle⁃to⁃everything(C⁃V2X)system,we propose a collision resolution and packet loss retransmission mechanism based on distributed feedback.The mechanism considers C⁃V2X terminals as distributed nodes in the network.Based on each node's identification of surrounding collisions,the feedback information between nodes is used to perform the resolution and recovery of collisions.First,the terminals recognize the surrounding collision events according to the set conditions and provide the feedback of the observed collision events in transmission.Second,collision terminals replace or reserve resources according to the received feedback messages,and thus resolve the collision and coordinating resources.Finally,the terminals that have resolved the collision retransmit the collision data in order to ensure the real⁃time information update.Simulation results demonstrate that,compared with the scheme in 3GPP specification,the proposed mechanism improves the packet reception ratio by about 13%and reduces the packet update delay by about 200 ms under severe congestion(300 veh./km),and the proposed scheme can help to meet the high reliability and low latency requirements of V2X information interaction.

关 键 词：车联网 C-V2X 分布式反馈 资源碰撞 错误重传 

分 类 号：TN929.5[电子电信—通信与信息系统]