Research On Wireless Resource Allocation Technology For D2D Cellular Communication System

With the increasing demand of local business,how to improve resource utilization is an important problem.D2D(Device-to-Device)communication is considered as an effective method.In D2 D communication,two closely located users can directly communicate with each other instead of via the base station.D2 D communication technology can improve user experience,reduce communication delay and system power consumption.However,D2 D communication will inevitably introduce interference to wireless cellular networks,because D2 D users can only communicate with each other by reusing channel resources of cellular users.Thus,how to conduct interference management is an urgent problem.In this thesis,we study wireless resource allocation algorithm in two different cellular D2 D communication networks,aims at coordinating the interference among users and improving the spectral efficiency.In this thesis,a more general radio resource sharing rule is adopted,which does not limit the way how D2 D users reuse channel resource,we allow each channel occupied by a cellular user to be assigned to one or more D2 D link and any D2 D link can reuse more than one channel.In this scenario,we study the resource allocation problem,aims at maximizing the data rates of D2 D users,meanwhile,guarantee the quality of service requirements and limit the transmit power of both D2 D users and cellular users.Optimal Wireless Channel Assignment is proposed to solve channel allocation problem.Joint Power Control algorithm is proposed to solve the power control problem.Simulation results show that the proposed algorithms can improve the data rates of D2 D users,ensure the quality of service requirements of cellular users and D2 D users,and control system power consumption.In order to improve the flexibility of network.We introduce relay nodes to cellular networks and consider the mixed D2 D communication mode combining single hop and multiple hop.D2 D users choose the communication mode according to their communication requirements.In this scenario,this thesis studies the resource allocation problem of relay-enhanced D2 D communication,aiming at minimizing the system power consumption,guaranteeing the quality of service requirements of both cellular users and D2 D users and limiting transmit power of cellular users,D2 D users and relay nodes.Specifically,we propose Joint Mode Selection and Relay Selection algorithm to handle the communication mode selection and relay node selection problem of D2 D users,we propose Relay enhanced Channel Assignment algorithm to handle the channel allocation problem,we propose Realy enhanced Power Control algorithm to solve the power control problem.Simulation results show that the proposed algorithms can reduce the system power consumption and guarantee the minimum data rate requirements of both D2 D users and cellular users.