Research On D2D Resource Allocation Algorithms And Simulation In 5G Wireless Networks

In recent years,with the 5G research work actively carried out,its key technology has also been favored by the majority of researchers.Among them,D2D(Device-toDevice)technology has become a hot spot.D2 D communication can make direct communication between the terminal equipment,thus it reduces the load of base station,reduces the transmission delay,and improves the communication quality.Nowadays,the demand of users in the network is explosively increasing while the resources in the network are limited.Therefore,in the process of D2 D communication,a good resource allocation scheme is the key to reduce the interference and improve the resource utilization rate.This paper focuses on the optimization of resource allocation in D2 D communication.The main research works are as follows:First,due to the increasing demand for point-to-point data sharing services,in order to reduce network service latency and improve communication efficiency,cache technology can be applied to D2 D communication to cope with the growth of media business.In the D2 D cache technology,the cache hit probability is a key indicator to measure whether system cache performance is good or not.To maximize the cache hit probability,how to allocate the limited cache resources is the focus of the study.In this paper,the existing D2 D cache technology is classified and summarized,and a new D2 D cache model based on full-duplex communication is proposed,and then an optimization model is established to solve the cache resource allocation scheme with the highest cache hit probability.The simulation results show that the cache hit probability based on the full-duplex D2 D cache technology proposed in this paper is obviously improved compared with the half-duplex mode.Second,since the communication between the D2 D devices is not forwarded by the base station,the D2 D terminals need to handle a series of problems with device pairing,mode selection,channel state estimation,and power allocation,thereby resulting in additional power consumption.The energy harvesting technology used in D2 D communication can effectively increase the communication node transmission power,and improve system capacity.In this paper,a D2 D communication technology based on energy harvesting is studied.The D2 D communication model based on energy harvesting is constructed in Gaussian white noise channel,and the system capacity is maximized by allocating the transmission time reasonably for the transmitter and the receiver.On this basis,the capacity optimization problem of energy harvesting D2 D system in shadow fading channel is studied as well.Finally,the smoothness of system capacity is simulated and analyzed.