With the introduction of small cell into current macro cell structure, the ever-growing demand for mobile data\nservice has the opportunity to be fulfilled. But the correspondingly overlaid dense deployment situation caused by\nthe Heterogeneous Network (HetNet) also arouses the interference and mobility management problems. In order to\nsolve the above problems, we propose the Joint Voronoi diagram and game theory-based power control scheme\nfor the HetNet small cell networks with two-step approach. The first step focuses on the optimization of the small\ncell cluster deployment planning within the coverage of the macro cell. The intra-tier interferences are mitigated by\nthe min-max power allocation algorithm and the mobility management performance can also be improved by the\nVoronoi diagram-based scheme. Then, the second step addresses on the mitigation of cross-tier interferences while\nprotecting the guaranteed users and high-mobility users usually served by the macro cells. The game theory-based\ndynamic power control scheme is proposed via non-cooperative game model with the convex pricing function.\nThe existence and uniqueness of the Nash equilibrium for the proposed game model are verified, which provide\nthe feasible solution for the cross-tier power control in the heterogeneous network. From the observation of the\nsystem-level simulation results, the proposed scheme can bring a significant increase in the system throughput,\nreduce the outage probability, as well as enhance the energy efficiency over current works.
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