Energy efficient power optimization in two-tier femtocell networks with interference pricing

With the mass deployment of femtocells, serious cross-tier interference may be caused to the macrocells, together with large amounts of energy consumption. In this paper, the power control problem for the co-channel deployed femtocells is investigated. We first model the uplink power control problem as a non-cooperative game, where co-channel interference is taken into account in maximizing the energy-aware utility. By introducing a convex pricing function of the cross-tier interference, Pareto improvement can be obtained. Furthermore, based on the non-cooperative game, we devise a distributed power allocation algorithm together with an optimal price seeking algorithm. Simulation results show that the proposed algorithm can improve user utilities significantly, compared with existing power control algorithms.