Research On Resource Management Based On Coalition Formation Game In D2D Communication

Device-to-Device(D2D)communication technology,as one of the core technologies of 5G,has attracted wide attention at home and abroad because of its great potential in increasing system capacity,improving spectrum utilization and reducing energy consumption and delay.By reusing the resources of cellular users(CUE),D2 D users(DUE)can directly communicate with each other without the need for base station forwarding,thus improving system throughput and spectrum utilization.Therefore,resource management research in D2 D communication is indispensable.In this paper,resource management and power control for two different resource reusing models in the single cell are studied.The main work is summarized as follows.1.Research on one-to-many reusing model(a CUE can only be reused by one DUE,and a DUE can reuse multiple CUE resources.)Based on the one-to-many reusing model,the paper aims to maximize the throughput of D2 D system.The resource allocation problem is modeled as a coalition formation game problem,and the coalition is formed by the proposed coalition formation algorithm.In order to both reduce the complexity and improve the performance,the priority sequence is proposed to guide users to join or leave the coalition.In addition,in order to further improve the throughput of D2 D system,a power control scheme based on Whale Optimization Algorithms(WOA)is proposed to optimize the power of users.The simulation results show that the proposed algorithm achieves almost the optimal solution with less complexity.2.Research on many-to-many reusing model(a CUE can be reused by multiple DUE,and a DUE can reuse multiple CUE resources.)Based on the many-to-many reusing model,this paper separately focuses on the optimization of maximizing the throughput of D2 D system and maximizing the number of D2 D access.Firstly,aiming at maximizing the throughput of D2 D system,the resource allocation problem is formulated as a coalition formation game problem,and a resource allocation scheme based on the overlapping coalition formation game(OCFG)is proposed.In the game,according to the interference sequence,this paper proposes a novel initialization scheme to guide users to form the initial coalition structure quickly.In addition,in order to obtain the optimal coalition structure as far as possible,we propose the splitting sequence and the merging sequence to guide coalition formation,in which fusion sequence is based on matching theory.The paper also proposes a power control scheme based on WOA algorithm to improve system performance.In addition,the convergence,stability and complexity of coalition formation algorithm are analyzed.Finally,the simulation results show that the proposed algorithm can effectively improve the system throughput.Secondly,aiming at maximizing the number of accesses to D2 D system,the resource allocation scheme based on OCFG is proposed.With guaranteeing the quality of service(Qo S)of all users,DUE splits from or merges in the coalition according to the proposed split-merging rule,and we can get the final stable coalition according to the proposed coalition formation algorithm.The feasibility of the algorithm is proved by simulation,which can improve the access rate significantly.