Research On Resource Allocation And Power Control Of D2D Communication

As one of the important auxiliary means for the future 5G(5th generation mobile communication system): D2D(Device-to-Device)communication technology is to increase wireless spectrum efficiency,increase mobile network communication capacity,reduce latency,and reduce the load on the base station.Effective means.This paper aims at maximizing the throughput of single-cell system and multi-cell system,establishes the D2 D communication model under the cellular network,and carries out theoretical analysis and simulation verification of the resource allocation problem and power control problem in the D2 D communication system under the cellular network.This paper first analyzes and summarizes the interference in D2 D communication.Secondly,starting from the single-cell D2 D multiplexing cellular network uplink resource model,aiming at maximizing the throughput of the cellular system,in order to solve the problem that the cellular system resources cannot be fully utilized,this paper decomposes the problem into resource allocation sub-problems and user collaboration sub-problems.The resources are divided into time division multiplexing and frequency division multiplexing.After that,the sub-problems of resource allocation sub-problems and user sub-problems under time-division multiplexing,sub-problems of resource allocation under frequency division multiplexing and sub-problems of user collaboration are solved respectively.Theoretical analysis of resource allocation and user collaboration algorithm,the algorithm can effectively reduce the computational complexity.By comparing the resource allocation with the simulation results of the user collaboration algorithm and the random assignment algorithm,it can be concluded that the resource allocation and user collaboration algorithm can effectively improve the throughput of the D2 D system.Then,a single-cell multi-antenna relay cooperative D2 D communication system model(MIMO Relay Aided-D2 D,MRA-D2D)is put forward,and mathematical modelling and detailed theoretical derivation of this model are performed,and the transmission power is analyzed.The effect of the number of relay antennas on the SINR and energy efficiency of the MRA-D2 D link validates the importance of relay cooperation in D2 D communication systems.Finally,the single-cell system is expanded to a multi-cell system,and the cell area is partitioned and the spectrum resources are processed in blocks.The interference between cellular users and D2 D users in different areas is analyzed in detail,and then the multi-cell system is modeled.Compared with the traditional partial power control algorithm,the dynamic power control algorithm adopted in this paper can effectively improve the signal-to-interference-plus-noise ratio distribution of multi-cell systems,greatly reducing the interference of users in the cell-edge area,and improving the multi-cell system throughput to some extent.