A Price-Based Optimization Strategy of Power Control and Resource Allocation in Full-Duplex Heterogeneous Macrocell-Femtocell Networks

Abstract

In this paper, we investigate the problem of resource allocation and cross-tier interference mitigation in full-duplex orthogonal frequency division multiple access -based heterogeneous networks consisting of macrocell and underlaying femtocells. First, we design a price mechanism to maximize the utility of both macro base station and femtocell base stations under finite interference constraint. We then propose a triple optimization strategy for power control, subcarrier allocation, and price regulation to mitigate the cross-tier interference. For the macrocell, the barrier method is proposed to implement the price-based resource allocation and ensure the utility maximization. For the femtocells, we propose a Lagrangian optimization algorithm based on KKT conditions to solve the power control and subcarrier allocation, in which a closed-form solution is derived to tackle the dual multiplier problem. Simulation results demonstrate that the resource allocation algorithm can effectively neutralize the cross-tier interference and maximize the utility of the heterogeneous macrocell-femtocell networks.

Keywords

• Heterogeneous networks
• OFDMA
• full-duplex communications
• resource allocation
• price mechanism