Research On The Interference Control Based On D2D Relay Communication System

With the development of mobile communication technology in the field of information industry,people's daily life is changing rapidly.The emergence of electronic devices and Internet applications directly lead to a higher data transmission rate requirement.Therefore,making use of data resources more efficiently and improving data transfer rates within a limited frequency range are the hot issues in the current field of mobile communications.In order to conquer this problem,most universities and scholars believe that the introduction of D2D communication technology and relay technology in the traditional cellular communication network is an effective and feasible solution.Firstly,the directly data transmission between terminal devices can be implemented through the short distance characteristic of D2D communication,which not only can reduce the transmission power of the terminal devices,but also extend the cell coverage area.Secondly,D2D communication can share spectrum resources of the cellular links and effectively to increase the capacity of the overall system.Finally,after relay technology introduced in D2D communication,intra cell interference can be extremely suppressed or eliminated by designing an appropriate scheme of rational resource allocation and power control.Thus cell throughput performance can be also improved.Therefore,this paper focuses on the interference control based on D2D relay communication system.An adaptive D2D relay selection scheme based maximum system capacity is proposed.On the basis of the above algorithm,the reliability and bearing performance of the system are also analyzed in different scenarios.According to the research content,the paper will be as follows.Firstly,the LTE network environment of D2D relay communication is introduced,including the evolution of LTE standardization,network architectures,physical resources allocation and some key technologies used by the platform.Then,the application of D2D communication technology in LTE system is described,including the concept and the characteristics of D2D communication technology,common techniques and control method.Particularly,it further explores the ways of D2D communication sharing cellular resource without relay as well as the interference of different resource reuse scenarios.Finally,this paper focused on the work mode of relay technology in D2D communication system.The concept,scenes,classification and the strategies of forwarding resources of relay technology are involved in.This paper analyzes and compares the performance of the system capacity between the D2D communication system transmission model using relay technology and transmission model without relay technology.Then an adaptive D2D relay selection algorithm system based on maximum system capacity is proposed.The simulation results demonstrates that the cell coverage area and the bearing performance of the system can be improved after adding suitable relay nodes,when the D2D channel quality is very poor or the users are far from the base station.Besides,under the proposed scheme,when the resource information is shared by D2D links,selectively adding suitable relay nodes can do effectively suppress interference between cellular links and D2D links and greatly enhance the capacity of the system.