| With popularity of various mobile terminals, and continuous enrichment of application requirements in recent years, mobile communication network moves towards the orientation of network with greater capacity, higher transmission rate and higher bandwidth utilization in the future inevitably. In order to enhance network capacity, improve the spectrum utilization, D2D(Device to Device) technology as an underlying network is introduced into the traditional cellular networks. D2 D communication technology has many advantages, such as high spectrum efficiency, high data rate, low latency, low power consumption, implement of sharing service of local data, and extension of network area.However, the emergence of every new technology will also bring problems. Introduction of D2 D technology brings interference at the same time, including interference between different cellular links, interference between D2 D and cellular links, as well as interference between different D2 D links. Currently, the interference elimination methods mainly contain mode selection, power control and resource allocation, and most of the previous papers consider the elimination problem in a single cell, which seldom involve the mechanism where multiple cells exist. In scenario of multiple cells, on the one hand,interference analysis becomes more complex, which contains inter-cell and intra-cell interference. On the other hand, it is necessary for adjacent base stations to collaborate for exchanging relevant information. Therefore, interference coordination problem of D2 D communication in the scenario of multiple cells is studied in this paper, and exploratory researches are conducted from two aspects, which is significant to communication quality improvement of users at the edge of cells and interference management.First, there will be a plenty of signaling overheads brought by centralized controlling method when user number increases. Aiming at solving this problem, a semi-distributed resource and power allocation scheme based on Stackelberg game is raised in this paper.This scheme guarantees the communication quality of cellular users, improves the spectrum efficiency as much as possible, and results in a limited signaling overhead to base station. In addition, parameter CCGI is introduced during the resource allocation process,indicating both the channel gain and interference situation, as the basis of measuring channels and dynamic adjustment. In this scheme, neighboring base stations communicate with each other just for information of maximum/minimize interference price, interference adjustment information, and so on. Also, serving base station communicate with each D2 D UE only for interference price, normalized power and other control messages. Compared with the distributed scheme based on energy efficiency, simulation results show that the proposed scheme can improve the throughput of the whole network, and does not result in a great loss in energy efficiency performance.Then, in order to realize higher spectrum efficiency and a more effective interference elimination method, a joint resource allocation and power control scheme based on graph theory is presented in this paper, which considers the problem from aspects of resource allocation and power control at the same time. On the basis of controllable interference,this method achieves a many-to-many way between mobile users and spectrum bandwidth.In this scheme, neighboring base stations communicate with each other just for information of D2 D UE information, channel gain and others, and serving base station is in charge of computation process. Compared with other schemes, simulation results show that the proposed scheme can not only improve the overall throughput, but also realize the efficient utilization of spectrum. |
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