Research On Efficient Allocation Algorithm Of D2D Communication Resources

Device to Device(D2D)is a new communication mode that supports direct data transmission between neighboring users.The D2 D system deployed in the cellular network can expand the capacity of the cellular system on the one hand,and may cause additional interference to the base station and cellular users on the other hand,especially when the D2 D system reuses cellular channels,it will affect the quality of service of the cellular equipment.of Service,Qo S).How to efficiently schedule D2 D communication resources to reduce the interference between the cellular system and the D2 D system to improve spectrum efficiency and energy efficiency has become a technical difficulty in D2 D communication,and it has also been a research hotspot in the field of wireless communication in recent years.To this end,this thesis studies the optimal allocation of resources for cellular-D2 D hybrid systems,focusing on the channel-power joint allocation algorithm that takes into account user fairness,and D2 D based on non-orthogonal multiple access(Non-Orthogonal Multiple Access,NOMA)Relay communication scheme.The specific research content is as follows:(1)Aiming at the problem that the current D2 D resource allocation does not take into account user fairness,the efficient allocation of multi-user D2 D system resources is studied,and a channel-power joint optimization allocation algorithm that takes into account fairness is proposed.The program defines the utility function as an index to measure user satisfaction,and maximizes the total utility of D2 D user communication as the optimization goal,and derives the optimal channel-power joint allocation plan for D2 D communication.The simulation results show that,compared with the traditional greedy resource allocation algorithm,the proposed algorithm not only improves the fairness between D2 D users,but also improves the total throughput of the D2 D system.(2)The energy efficiency improvement of multi-user D2 D communication system is studied,a D2 D relay communication scheme based on NOMA is designed and the corresponding resource allocation algorithm is studied.This scheme considers that the D2 D sender sends multiple signals in NOMA mode,and the relay node restores the signal of this node based on the SIC and forwards the signals of other nodes.Based on this,the energy efficiency optimization model of the D2 D relay communication system is constructed,and an iterative solution algorithm is designed to derive high Energy-efficient channel-power joint optimization allocation strategy.The simulation results show that the NOMA-based relay D2 D communication allocation scheme and its resource allocation algorithm can effectively improve the energy efficiency of the D2 D system.The research in this thesis shows that reasonable allocation of resources such as channels and power can help improve the communication performance of D2 D systems,while the introduction of technical solutions such as relay and NOMA can further improve spectrum efficiency and energy efficiency.The research scheme in this thesis has certain guiding significance for D2 D communication under resource-constrained conditions.