Research On Interference Management Technology Of Cellular D2D Heterogeneous Networks

Rapidly growing mobile user data traffic,access to a large number of mobile terminal devices pose significant challenges to existing mobile communication network architectures and limited spectrum resources.D2D(Device to Device)communication technology realizes the performance of reducing base station load,improving spectrum utilization,and improving cell coverage by virtue of short-distance direct communication,shared multiplexed cellular network resources,and widely distributed terminals.However,D2D communication sharing the resources of cellular network will make the interference management of the heterogeneous network more complicated.This paper studies the interference management technology of cellular D2D heterogeneous networks.The main contents and innovations are as follows:1.Overview of cellular D2D heterogeneous network interference management technology.Analyze the interference situation when D2D communication uses different spectrum resources,and introduce the principle and specific scheme of existing interference management technology.2.Aiming at the D2D intra-layer interference of heterogeneous networks,a Stackelberg game theory scheme based on global interference matrix is proposed.Through the three steps of signaling,global interference matrix formation,global interference matrix for user priority and scheduling decision,the short-distance interference problem caused by the close distance between each D2D pair is solved.In Matlab simulation,the proposed scheme is superior to the traditional game theory scheme in terms of convergence speed for both mild and severe short-range D2D interference.3.For the inter-layer interference of heterogeneous networks,a price uniform scheme based on dynamic user priority and base station protection area and a price difference scheme based on dynamic user priority and base station protection area are proposed.Based on the two original schemes of base station price uniformity and base station price difference,dynamic user priority and base station protection area are added.The dynamic user priority is flexibly set according to the geographical conditions of each D2D pair,and the base station protection area can effectively control the interference of the D2D layer to the base station.And through the theoretical derivation of the performance of each system of heterogeneous network and Matlab simulation tools to verify.According to the simulation results,the proposed schemes have a better improvement in system performance.