Research On Downlink Power Control Technology Of Ultra-dense Networks

With the rapid development of Internet business,traditional network can no longer meet users' demands for network capacity.In order to improve network capacity,it is proposed to increase network capacity by deploying ultra-dense network.Although the ultra-dense network can greatly improve the network capacity,its ability to improve the capacity of the network is greatly limited owing to its own severe interval interference.Therefore,suppressing interference in ultra-dense networks and increasing network capacity have become the key of this study.This paper proposes two different schemes for inter-base station interference in ultra-dense network,which are as follows:1.In order to address the issue of co-channel interference in the small-scale deployment of ultra-dense network,a power control scheme based on the weights of base stations is proposed on the basis of cell cluster,and the average interference of the system is obtained during the implementation of the scheme.The thresholds are used to cluster the interfering base stations,so that the base stations in the same cluster cooperate with each other to provide services for the users in the cluster,and the corresponding power values are allocated to the base stations in the cluster by using the weight values in the clusters occupied by the base station.The base station allocates the optimal power value to achieve the purpose of power control and interference suppression.The simulation results show that the proposed scheme reduces the average outage probability of the system,and improves the system average throughput,the average spectrum efficiency of the system,and the average power efficiency of the system.Compared with existing power control schemes based on water-injection algorithm on the basis of cell cluster,this scheme is still better in terms of interference suppression performance.2.In view of the co-frequency interference problem arising from the large-scale deployment of ultra-dense network,a non-uniform pricing power control scheme based on Stackelberg game is proposed.During the execution of the solution,the first is to establish a non-uniform pricing power control model based on the Stackelberg game,secondly,to solve the optimal transmit power based on price through the model,and then to solve the corresponding base station through the introduction of Lagrangian function.The optimal interference price of the corresponding base station,and then the controller sends these interference prices to the corresponding base station,the base station adjusts its own power value according to the power price formula to achieve the purpose of power control and interference suppression.Simulation results show that the proposed scheme reduces the system average outage probability,and improves the system average throughput and the system average spectrum.Compared with the existing unified pricing power control scheme based on the Stackelberg game,the scheme is more prominent in the overall performance of interference suppression.