Research On Resource Allocation In D2D Communication For 5G Networks

The next-generation mobile communication system,5G(Fifth-Generation),is an order of magnitude or higher in terms of spectrum utilization and energy efficiency compared to 4G mobile communication.Since the 5G communication system will serve a wider variety of users,such as mobile users,vehicle networking users,industrial users,drones and other kinds of users,how to guarantee user' QoS(Quality of Service)within limited spectrum resources has become a hot and difficult point of research.D2D(Device-to-Device)communication technology could make direct link communication with the neighboring devices by sharing the spectrum resources of cellular users,and because of it uses the multiplexing mode,it can improve spectrum utilization.Thus,it is one of the key technologies for implementing 5G communication.However,multiplexed spectrum resources will bring different levels of interference and impact to users in the system,and as the number of users increases,the degree of influence will also increase.Therefore,for the problem of multiple users reuse cellular resources,it is of great significance to study the resource allocation strategies of D2 D communication technology in 5G.The research on Device-to-Device communication technology domestic and overseas mainly focuses on the discovery mechanism,communication mode selection,resource management,etc.This paper mainly studies the QoS guaranteed resource allocation method in D2 D communication for 5G network.Firstly,the scenarios of multiple D2 D users reuse the same cellular resources in a single cell are studied.According to the QoS requirements,aiming at maximizing system throughput,a power control and interference coordination scheme using cuckoo search optimization is proposed.Secondly,the network scenario is extended to multiple cells,and a multiple users' resources allocation scheme with multi-cell under QoS guarantee for D2 D communication is proposed.At first,the scheme further analyzes the situation that the D2 D user reuse the uplink network resources of the local cell or the neighboring cell,abstracts a multi-cell D2 D communication interference model,and optimizes the resource allocation according to this model.Then,predicting DUEs' positions based on the users' history mobility trajectory data.The secondary resource matching is performed,so make a comparison of the system throughput under the two resource allocation schemes,choose the optimal matching,and finally the power optimization is performed.The effectiveness of the algorithm is proved by comparing the simulation experiment with other methods.Through the research of resource allocation schemes in single-cell and multi-cell scenarios in D2 D communication,the proposed scheme can improve the throughput and spectrum utilization of the system,and can ensure the QoS requirements of users and achieve interference limit,which is a multi-cell network resource.The study of distribution provides a valid reference.In addition,user mobility management under multi-cell involves more problems and needs further research.