Energy efficient resource allocation in two-tier OFDMA networks with QoS guarantees

Abstract

In this paper, we introduce the joint power and subchannel allocations techniques for OFDMA based femtocell networks with focus on uplink direction. These techniques minimize the aggregate power of all Femto user equipment and maximize the total system energy efficiency while satisfying the minimum required rate of all users. An interference limit constraint is also considered to protect the QoS of macrocells. The original problem is a mixed-integer non-convex optimization problem which is converted to a convex problem using the time-sharing concept. Furthermore, Three algorithms are proposed to provide a scheme to optimize the goal function while meeting the constraints. The complexity order of all algorithms was investigated and was compared to other alternative solutions. The analytic and simulation results have demonstrated that the proposed algorithms could achieve significant power saving and better energy efficiency compared to existing algorithms.