Research On Interference Coordination Of Cellular And D2D Hybrid Networks

In the cellular and D2D hybrid network,D2D communication with its small delay,low power consumption,high speed and other advantages to meet the multimedia services on the bandwidth requirements.However,D2D users reuse the resources of the cellular user to bring unavoidable interference to the hybrid network,which seriously affects the system performance.Therefore,how to coordinate the interference in the hybrid network is one of the issues which researchers are closely concerned about.The interference coordination between cellular and D2D hybrid networks is studied from three aspects: mode selection,resource allocation,power control.In this paper,we use the multiplexing mode to study resource allocation and power control by default.We introduce and deduce the representative algorithms respectively,including the resource allocation algorithm under the interference limiting region,the power control algorithm of the double power control factor,and the interference limiting region Dynamic power combining algorithm,and study the performance of various algorithms through simulation.Based on the study of resource allocation and power control,this paper proposes a scheme based on joint resource allocation and power control to improve system throughput.When the resource is allocated,the user is first clustered,and the cluster refers to the collection of cellular users and D2D users that multiplex the same resource.According to the interference diagram to Calculate the size of the interference between any two users,and the larger interference will be separated from the two users,the result of clustering is the smallest total interference in the system.And then the partition has been divided into a large number of resource blocks to maximize the system capacity as the goal,using an iterative distribution scheme.On the power control,we adjust the power of the D2D users dynamically according to the preset interference threshold and the channel gain estimate between the D2D user and the cellular user and the base station.The simulation results show that the proposed algorithm can improve the overall throughput of the hybrid network.