Research On Vehicle Communication Performance Based On C-V2X Mode 4

In recent years,road traffic safety and traffic efficiency have gradually become the focus of research on intelligent transportation systems,and the Internet of Vehicles technology has become an effective means to improve road safety and traffic efficiency.At present,the formulation of standards for the key technology of Internet of Vehicles C-V2 X has been basically completed.In the C-V2 X Mode 4,the semi-permanent scheduling protocol SPS was introduced.With the support of the protocol,vehicles exchange direct broadcasts by beacon messages containing vehicle status.The high-reliability transmission of these beacon messages guarantees the service quality of security applications.However,there are few studies on the performance of C-V2 X Mode 4 communication and the causes of beacon transmission errors,and no performance evaluation has been conducted in conjunction with actual traffic scenarios.Therefore,based on the above deficiencies,this paper proposes a communication performance analysis model based on C-V2 X Mode 4.This article firstly simulates and designs the V2 V communication in C-V2 X Mode 4 under a one-dimensional scenario that is reasonable and without loss of generality.On this basis,its performance is analyzed and evaluated.Calculate the change of signal receiving power and signal-to-interference plus noise ratio SINR at different distances to evaluate the received signal quality.Calculate the average packet reception ratio PRR and packet delivery ratio PDR according to the distance design function between the sending end and the receiving end as indicators to measure broadcast performance,and calculate the packet delay at different distances as an evaluation index of beacon delay.Then analyze and quantify possible beacon transmission errors.The experimental results show that this paper can discover that the SPS protocol has obvious RB collision in resource allocation.In addition,by adjusting the simulation parameters,the beacon error rate caused by RB collision is obtained.Secondly,in the actual application scenario,the traffic environment is complex,which may cause channel congestion and beacon collision,and the communication performance will also be reduced accordingly.The Internet of Vehicles has a high standard of reliability requirements for safety applications,so this paper combines the vehicle performance analysis model with specific application scenarios to evaluate the performance of C-V2 X Mode 4 under real urban traffic conditions.Finally,design experiments to analyze the impact of key parameters in the MAC and physical layer of the SPS protocol,and further improve the reliability of broadcast performance by adjusting the parameters.The experimental results show that the communication performance can meet the requirements in practical applications,and the parameters that can improve the service quality in the SPS protocol are successfully analyzed and mined.