Research On LTE-V2X Protocol Stack System Implementation And Communication Resource Optimization Scheduling Algorithm

How to ensure traffic safety and improve traffic efficiency are important issues that need to be resolved in the process of urban development.Through the innovation of communication technology,Internet of Things(Io T)comes into public lives.People hope that vehicles can communicate with other participants on the road through On-Board Unit(OBU),so as to solve traffic problems reasonably.Therefore,the research of V2 X technology and the realization of Intelligent Transportation System(ITS)have become the current focus of the automotive industry and academia.Based on the Chinese LTE-V2 X communication industry standard,this thesis designs the V2 X protocol stack that can realize vehicle information acquisition and wireless communication.On this basis,this thesis researches the communication resource scheduling algorithm based on LTE-V2 X,in order to ensure the reliable communication between vehicles.The main work of this thesis is as follows:(1)A LTE based V2 X protocol stack system is developed.This chapter analyzes the Chinese industry standards and technical requirements of LTE-V2 X communication,focus on the frame structure and communication mechanism specified in the standard requirements,thus determines the overall architecture and operating environment of V2 X protocol stack system.And realizes the V2 X protocol stack system software development in layers.Provides the basis of information interaction and processing between vehicles.(2)An information acquisition module based on the protocol stack system is designed.This chapter analyzes the message types and communication requirements of V2 X system,on this basis designs an information acquisition scheme to obtain vehicle operation data from the CAN bus and vehicle positioning data from the GPS module.This chapter develops an information acquisition program for the CAN bus and the GPS module,and can be cooperated with the application layer of the protocol stack system,enable the protocol stack system to interact the acquired vehicle information with other vehicles.Provides technical support for Intelligent Connected Vehicle(ICV)applications.(3)A communication resource optimization scheduling algorithm is proposed.This chapter analyzes the wireless channel model of LTE-V2 X and the mainstream communication resource scheduling algorithms of the LTE-V2 X cellular network communication mode(Mode 3)and the direct communication mode(Mode 4).And conducts a specific analysis of the V2 X safety application scenarios.From the perspective of actual application scenarios and the types of transmitted messages,divides the V2 X applications into three categories.On this basis,this chapter proposes a wireless resource allocation method based on mode switching mechanism to ensure the reliability of communication in vehicle dense scenarios.(4)System’s overall function is tested,and communication resource scheduling algorithm is verified through simulation.In this chapter,the functions of the protocol stack system including information acquisition,message encoding/decoding and data sending/receiving have been tested.Additionally,this chapter builds a Matlab simulation platform to simulate and verify the proposed wireless resource allocation method.In summary,this thesis has completed the development and implementation of the LTEV2 X protocol stack system in accordance with Chinese communications industry standards,and analyzes the wireless communication characteristics of the protocol stack system,studies the resource scheduling algorithm of V2 X communications.A wireless resource allocation method based on mode switching mechanism is been proposed using to ensure the reliable transmission of V2 X.The test and simulation results show that the protocol stack system developed in this thesis can realize the communication function between vehicles,the communication mechanism and the message type meet the standard requirements.Moreover the PDR of the proposed wireless resource allocation algorithm in the vehicle dense scene can be no less than 0.6,better than the mainstream communication resource scheduling algorithm in single communication mode.