Research On D2D Communication Radio Resource Management In Cellular Network

Device-to-device pass-through communication(Device-to-Device,D2D)technology refers to a terminal through communication technology where users can communicate directly without going through a base station.And has been listed as one of the key technologies of 5G.The mobile cellular network that joins D2 D communication technology can increase resource utilization and the overall throughput of the cellular system.But the unreasonable introduction of D2 D communication technology will bring more interference.Reduce the overall performance of the cellular network.The main research of this thesis is to reduce the mutual interference between users and base stations by designing a reasonable interference coordination algorithm.And improve the overall performance of the hybrid cellular network system.In this thesis,we first take the single-cell cellular networks introducing D2 D communication as the research object.And take the total rate of D2 D users as the optimization goal to propose a method of joint resource allocation and power control to achieve energy-efficient D2 D communication.Then this thesis takes the multi-cell cellular networks introducing D2 D communication as the research object.Proposes a resource allocation algorithm for the introduction of relay nodes that aims to optimize the link rate of the cellular network.The algorithm first selects the appropriate relay node.Secondly,construct the cellular network link rate as the target function.Finally,according to the continuous update between the transmission power of the cellular user and the D2 D user and the introduced Lagrange factor,the optimal value of the cellular network link rate is obtained.Simulation results show that the algorithm proposed in this thesis can effectively improve the anti-interference ability of D2 D users and cellular systems in the cellular hybrid network,increase the spectrum utilization rate of the cellular network and its overall link rate.