Consensus Based Power Update Algorithm for OFDMA-Based Femtocell Networks

Abstract

In this paper, we study the power assignment problem of the downlink of an OFDMA-based two-tier femtocell network. We aim to provide a global fairness among the user equipments in terms of their SINR values. Because of the potential complexity of the femtocell networks, we propose a distributed consensus-based power update algorithm to keep the required information exchange of the base stations minimal. Even though there exist some power control algorithms serving for the same fairness purpose, they are applicable only for the systems where each base station can have at most one user. Since femtocells are designed to serve more than one user equipment at the same time, the proposed power update algorithm can be considered as more real life applicable, and stands out amongst others by its ability to ensure consensus in multi-user/subchannel systems.