Research On Relay Selection Algorithm Of D2D Communication Network Based On Cellular Network

With the vigorous development of mobile communication technology in various countries,mobile communication has achieved rapid development.While we are still enjoying the convenience of the fourth generation mobile communication network,5G communication networks have entered people’s lives.As one of the key technologies of 5G communication,D2D(Device to Device)technology has attracted more and more attention from scholars and experts.D2 D communication technology is a key research point in the fiery 5G wireless communication system currently being studied worldwide.D2 D communication technology compared with the well-known traditional cellular communication network,D2 D communication technology enables terminal devices to communicate directly,which gr eatly reduces the load on the mobile network.D2 D relay communication technology is a combination of D2 D communication technology and relay technology,which expands the scope of communication and improves the performance of network systems.This paper mai nly studies the D2 D relay communication technology.This paper first studies the relay selection in D2 D relay communication technology.Aiming at the problem of power consumption in D2 D relay communication system,a relay selection algorithm with joint power allocation is proposed.By dividing the relay selection area,a candidate relay set is esta blished.Based on the Lagrange Multiplier Method,the power problem is optimized,and finally the relay node that can minimize the power consumption of the commun ication system is selected.Simulation analysis validates the performance of the proposed algorithm.Secondly,in view of the problem of multi-relay parallel transmission in D2 D communication network,the transmission situation of D2 D dual-relay cooperative communication system is analyzed.Based on the traditional dual-relay network AF and DF forwarding method,a relay node combined forwarding method is proposed.And analyze the interruption situation when the two relays in the D2 D dual-relay cooperative communication system adopt three different forwarding methods,and perform power allocation to the nodes at the same time.This method not only significantly reduces the transmission power of the source node,but also effectively reduces the total power consumed by the D2 D dual-relay cooperative communication system and saves system power consumption.