System Level Simulation Design And Performance Evaluation For Cellular Vehicle To Everything

Vehicle to everything is one of the key technologies of intelligent transportation system.It allows vehicles,pedestrians and infrastructure to collect information about the environment and exchange it with other nearby entities.Therefore,it can notify potential dangerous situations to ensure urban traffic safety.The third generation partner project(3GPP)introduced cellular vehicle to everything(C-V2X)since release 14(R14).At present,research about the basic security requirements of C-V2X and advanced V2X services,including automatic driving,remote driving,vehicle formation,and extended sensing is in full swing.As the basis of relevant research,the research on the system performance of C-V2X has an important guiding significance for the theoretical development and actual system deployment of the Internet of vehicles,which has become the focus of the industry.Therefore,this paper focuses on the analysis and research of the system performance of C-V2X.First of all,this paper designs and implements the system level simulation platform based on the current standardization protocol.Then,based on the system level simulation platform,the corresponding performance analysis and evaluation results are given.Finally,according to the analysis and evaluation results,the performance optimization scheme is proposed.The main research work and innovation include:1.According to the performance evaluation methodology for the NR-V2X defined by 3GPP,a system level simulation platform for C-V2X is designed and built in this paper.Aiming at the basic traffic related to safety,a V2V platform based on PC5 interface is built,which realizes the functions of sending,receiving,demodulating and various resource selection algorithms in V2V communication.At the same time,aiming at the advanced v2x application,a V2N platform based on Uu Interface is built,which realizes the functions of dynamic resource allocation,antenna array modeling and link adaptation.2.This paper evaluated the performance of C-V2X based on the built system level simulation platform.Firstly,the reliability of V2V communication system is studied from two aspects of vehicle density and traffic load.The results show that the target reliability requirements can be achieved under different traffic load conditions in highway scenarios,while in urban scenarios,high traffic load will lead to reliability degradation,so further research on resource scheduling algorithm is needed.Then,the transmission capacity and coverage performance of V2N communication system are studied.The simulation results show that the transmission capacity of the system can be increased 9-10 times by using millimeter wave communication technology,and the effective coverage can reach 240 meters and 2000 meters respectively in urban and highway scenes.3.In view of the problem that the traditional resource scheduling algorithm in V2V communication system is mainly designed for periodic traffic,which is difficult to meet the system reliability in high traffic load scenarios,this paper proposes a vehicle resource scheduling algorithm based on clustering.Firstly,by specifying the cluster head and pre configuring resource pool,the vehicles in V2V communication can be divided into clusters and pre configured orthogonal resource pool;secondly,by designing the vehicle resource reservation mechanism in the cluster,the cluster members can select resources independently to alleviate the resource collision problem in the cluster.The simulation results show that compared with the traditional V2V scheduling algorithm,the algorithm proposed in this paper can meet the performance requirements of aperiodic traffic transmission,and can effectively improve the system reliability.Through the system level simulation platform,the system performance of C-V2X is studied.The research results not only lay a foundation for the theoretical research of C-V2X,but also provide technical reference for the deployment and application of C-V2X.