Combined Transmit Beamforming and Channel-Aware Scheduling for Interference Mitigation in Femtocells
The introduction of femtocells in mobile networks gives rise to new co-layer and cross-layer interference scenarios. To mitigate interference, several approaches have been proposed in the literature including, e.g., Transmit BeamForming (TBF), power control, and fractional frequency reuse. In this paper, the authors present an interference mitigation approach that relies on a low-rate control channel between the victim terminal and the interfering Femto Access Point (FAP). The proposed method combines both, practical TBF schemes and simple one-bit channel-aware scheduling algorithms. They show that the proposed method can be effectively used not only to mitigate interference among FAPs, but also to balance user rates in adjacent cells with small signaling overhead.