Research On Relay Selection And Resource Allocation Strategy Based On D2D Communication

In the past 30 years,the cellular communication system has experienced rapid development and continuous evolution.The access of massive terminal devices and the ever-increasing user demands have brought tremendous challenges to the existing communication network architecture.Today,it is oriented towards the year 2020 and the future.The fifth-generation(5G)wireless communication technology has become a hot topic in the communications field.As one of the key technologies,D2D communication technology can raise the system capacity,increase the spectrum utilization rate,and alleviate the shortage of spectrum resources,so it has attracted much attention in the industry.However,if the D2D communication is far away from each other,the signal to interference and noise ratio of the D2D link may be too small to meet the communication quality requirements.In this case,information transmission can be performed through relay-assisted D2D communication,and while maintaining the original advantages of the D2D communication technology,the scope of D2D communication is greatly expanded.On the other hand,the problem of energy consumption brought about by the rapid development of communication technologies has become increasingly serious.How to reduce the energy consumption while ensuring the quality of communication services is still a problem that needs to be solved.This article mainly studies the problem of link energy optimization in cellular networks that support relay-assisted D2D communication technology.On the premise of guaranteeing the communication quality of each user's link,while considering the relay selection of D2D users,a resource allocation strategy for D2D users and cellular users is sought to minimize the uplink transmit power of the entire system in a unit time.In a scenario where a single cellular user's spectrum resource can only be multiplexed by a single D2D user,a D2D communication user uplink resource allocation and relay selection problem based on three-dimensional optimal allocation is proposed and solved;secondly,for a single cellular user The spectrum resources can be shared by multiple D2D users simultaneously.We propose an algorithm for resource allocation and relay selection based on the idea of cooperation game.