Research On Resource Allocation Algorithm For D2D Communication In Cellular System

The Device to Device(D2D)communication is an important technology in wireless networks,The D2 D communication introduced in cellular networks can improve system performance such as spectrum utilization and system throughput.When D2 D users and cellular users share the spectrum resources,they will be a serious interference with each other,Considering frequency interference,it is necessary to design a reasonable and effective algorithm to guarantee the QoS(Quality of Service)of cellular users and D2 D users,and to maximize the system throughput.For the D2 D communication in the multiplexing mode,this thesis proposes to maximize the total throughput of system under the premise of guaranteeing the quality of service in the two system models with or without relay.In the system model with relays,joint mode selection and resource allocation for D2 D communication in a cellular system based on maximum throughput are proposed.There is less research on joint mode selection,power control,relay selection,and spectrum allocation to maximize system throughput.Under the circumstance of guaranteeing the user QoS,the D2 D user performs the optimal power allocation in the direct mode and the relay mode first,and then constructs the mode selection,the relay selection,and the channel resource allocation into a four-dimensional optimization problem.The receiver of the D2 D user pair in pass-through mode is regarded as a special relay,and the original four-dimensional optimization problem is further converted into a three-dimensional optimization problem,and the algorithm proposed in this paper is converted into a two-dimensional optimization problem to find its approximate solution.The simulation results show that the algorithm can effectively improve the throughput of the system under the condition of ensuring the normal communication between the cellular user and the D2 D user.In the relayless system model,the research of resource allocation algorithm based on Stackelberg game theory is proposed.In this part of the study,the QoS of both cellular users and D2 D users was taken into consideration.Firstly,according to the minimum SNR limit condition of cellular users and D2 D users,a set of potential multiplexing cellular users is determined for D2 D users through linear programming;then the Stackelberg game model is constructed between D2 D users and their potentially multiplexing cellular users,and the D2 D user pair is obtained.Optimal transmit power;spectrum resource allocation based on utility function.The simulation results show that the proposed algorithm can improve the system throughput through the optimal resource allocation under the premise of guaranteeing the service quality of cellular users and D2D users.