基于动态资源分配的C-V2X拥塞控制策略OA

Cellular vehicle-to-everything(C-V2X)technology,as an integral part of the next generation intelligent transportation system(ITS),is committed to improving the communication efficiency and safety between vehicles.However,the existing access mechanisms of traffic message are prone to conflict and will cause transmission failure in the case of time-varying vehicle density.In view of the above,this paper proposes an information channel resource allocation strategy named dynamic semi-persistent scheduling(D-SPS),which focuses on the message congestion control of heavy traffic in the existing urban roads.In this strategy,a road-section-based ribbon clustering scheme is performed and the communication resources are allocated dynamically according to the node density within the relevant cluster,which to a certain extent alleviates the congestion caused by uneven distribution of node density in each lane during a specific time period.In addition,the lane cluster head election strategy is further improved on the basis of the above strategies,so as to reduce the election cost and improve the stability of the cluster.The results of modeling calculation and numerical comparison show that the proposed strategy can effectively reduce access congestion of current Mode 2 mechanism.In addition,the transmission timeliness of security beacons and the packet delivery ratio(PDR)of the information with high bit rate have been improved significantly in the scene of high-density data interaction.