| The rapid development of mobile network data service has led to a lot of data needs, making the traditional cellular network service capability severely challenged. D2D communication can improve the network spectrum utilization, increase the system throughput and expand the network coverage, so it can be used to alleviate this problem. But it also increases the energy consumption of the equipment, get the energy efficiency of D2D communication improved has become a problem that must be solved immediately.This paper first studies the D2D single antenna scene, according to the characteristics of users’ distribution, the D2D collaboration cluster is constructed, and the data is transmitted from one user to multiple users with the spectrum of the uplink users. After the constructions of the signal to noise ratio and energy efficiency evaluation standard of the D2D data receiving users, the problem of spectrum allocation and transmission power is jointly researched, and the joint problem is modeled as a non-transferable coalition formation game. With the merge-and-split algorithm and the Pareto Optimality, the game problem is solved, and the final cooperation strategy is obtained. The simulation results show that the strategy achieves the goal of improving the energy efficiency.Secondly, this paper studies the D2D multi antenna scene,considering the cooperation of the D2D sending end users, the multi-to-one cooperative cluster is established to improve the system energy efficiency. On the basis of building user information model and energy consumption model, the joint problem of beam-forming matrix and cooperative set structure with energy efficiency improvement is obtained. Due to the high complexity of the joint problem, it is transformed into two sub problems. The simulation data show that the beam-forming matrix and the cooperative set structure obtained iteratively can effectively improve the energy efficiency of the network system. |
