Research On Link Sharing And Resource Allocation Of V2V Communication In LTE-V System

LTE-V2V(LTE Vehicle to Vehicle)communication technology is one of the key technologies for the new generation mobile communication system and future intelligent transportation system.Resource allocation in V2V communication is of great significance for ensuring communication reliability and improving system performance.Link sharing between V2V users and cellular users can improve resource utilization and increase network access opportunities.However,the interference caused by link sharing will reduce the quality of communication service.In order to enhance the system performance through interference coordination,this paper discusses the link sharing and resource allocation of LTE-V2V communication in three scenarios respectively,and proposes a valid joint resource allocation and power control scheme for the aims of system capacity or energy efficiency optimization.(1)Based on the scenario of sharing resources between a single cellular link and a single V2V link,this paper first establishes a joint optimization problem aiming at maximizing system energy efficiency and ensuring the reliability requirements of each communication link as well as end-to-end delay constraints of V2V communication.Then,the problem is solved by matching theory and fractional programming.Simulation results show that the proposed method can improve the energy efficiency of users effectively,and meet the users’ quality of communication service.(2)This paper studies the resource allocation problem aiming at optimizing overall system capacity when multiple V2V links share the same cellular resource.This paper first clusters V2V links based on interference,and divides V2V links with less interference into the same cluster.Then,V2V links within different clusters reuse different cellular resources.To further increase the capacity,the power allocation of cellular users and V2V users is carried out based on DC programming and linear programming.Finally,simulation in different scenarios shows that the proposed joint resource allocation scheme can effectively improve capacity and communication reliability.(3)For the problem of V2V communication quality degradation caused by the distance between V2V communication transceiver nodes or unsatisfactory channel conditions,this paper uses the idle vehicle as relay to assist V2V communication,and discusses the communication mode selection,relay vehicle selection,resource allocation and power control.In this paper,the convex optimization theory is used to analyze the resource allocation problem in V2V direct communication mode and V2V relay communication mode.And then the best communication mode is selected for V2V communication based on capacity maximization.Simulation results show that the joint scheme based on vehicle relay can improve the V2V communication success probability and system capacity,setting the foundation for the subsequent researches of the LTEV2V vehicle relay problem.