Research On Cluster-based V2V Resource Allocation Strategy In LTE System

V2V(Vehicle to Vehicle)communication as one of the key technology of intelligent transportation attracts increasingly attention in recent years.Compared with traditional Io V(Internet of Vehicle),V2 V communication under the LTE network does not need to establish additional RSU(RoadSide Unite).Besides,LTE network has large capacity and high reliability of the technology which makes LTE-V2 V become hotspot in the field of IoV in recent years.In order to use LTE resources more efficiently for the management of mobile vehicles in large-scale,the resource allocation of V2 V communication is studied in thesis,which is based on LTE-V2 V communication.The main contents are as follows:Firstly,the available resources of LTE network are limited.And in the scence of large-scale V2 V communication,the problems of communication resources has to be solved.Thus,based on cluster,using spatial multiplexing technology between clusters to improve the efficiency of resource utilization is presented in thesis.Based on the previous research results,thesis proposes a clustering algorithm with low maintenance overhead which supports adaptive mobility.In the algorithm,we first propose the concept of link dependence based on the arguments of vehicle motion,as a metric to measure the similarity between vehicles.Then,on the basis of clustering,when it comes to V2 V communication resource allocation,it involves two stages: inter cluster and intra cluster.Inter cluster resource allocation mainly solves the problem of dynamic spatial reuse.In thesis,a mathematical model of vehicle topology established based on coloring theory to solve the resource dynamic spatial multiplexing problem;the study of intra cluster resource allocation is mainly to meet the requirements of vehicle communication.According to different message type,thesis presents different resource usage strategies.Re-plan the scheduling cycle of LTE frames.In one scheduling period,cluster head dynamically adjustments the resources occupancy ratio of different type of messages.The resources for peridic beacon message are used by reservation while for warning message,the competition strategy is needed.Finally,because of the half duplex communication mode of LTE-V2 V communication,and taking into account that different type of message have different requirements in real-time and reliability,based on the topological structure of cluster,thesis proposes an efficient and reliable message transmission strategy,especially the warning information by using eNodeB auxiliary,.The simulation results show that the proposed scheme can not only guarantee the real-time performance of the warning message,but also guarantee the coverage rate of them.