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