Interference Mitigation in Resource Allocation for OFDMA-based Macro/Femtocell Two-tier Wireless Networks

In this paper, we present the OFDMA-based macro/femtocell wireless system as a geometric model, based on which we propose a resource allocation (RA) scheme that mitigates cross-tier and inter-femto interference. To mitigate the cross-tier interference, the neighboring area where the macro mobile station (MMS) is regarded as neighboring MMS (NMMS) is decided according to the average signal-to-interference-ratio (ASIR) threshold; then the total spectrum resource is partitioned by the femtocell and its NMMS. Subsequently, RA for each femtocell is implemented as a strategic non-cooperative game by which the inter-femto interference is mitigated. Simulation results show that better performance can be achieved in terms of macrocell throughput, femtocell throughput on each subcarrier, MMS and femto mobile station (FMS) CDF of signal-to-interference-plus-noise ratio (SINR), with negligible femtocell throughput sacrifice.