Energy-Efficient Joint Power and Admission Control in Software Defined Mobile Networks

In this paper, we consider the joint power and admission control (JPAC) scheme in the software defined mobile network (SDMN) composed of a two-tier radio access network (RAN). We aim at maximizing both the energy efficiency (EE) and the femtocell accepting rates of the users. Then, the optimization problem is established as a mixed integer nonlinear problem (MINLP). To reduce the complexity of the NP-hard problem, Cauchy inequality and convex approximation are adopted to derive the sub-optimal solutions. Moreover, to facilitate centralized JPAC with the global management provided by the SDMN controller, a centralized scheme is proposed via OpenFlow protocol. Simulation results show that the proposed centralized algorithms provide the bounds of the optimum of the primal MINLP, and yield higher EE than the existing algorithm.