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Femtocell networks are promising for not only improving the coverage but alsoincreasing the capacity of current cellular networks. The interference-limitedreality in femtocell networks makes interference management (IM) the key tomaintaining the quality of service and fairness in femtocell networks.Over-the-air signaling is one of the most effective means for fast distributeddynamic IM. However, the design of this type of signal is challenging. In thispaper, we address the challenges and propose an effective solution, referred toas single-tone signaling (STS). The proposed STS scheme possesses many highlydesirable properties, such as no dedicated resource requirement (no systemoverhead), no near-far effect, no inter-signal interference, and immunity tosynchronization error. In addition, the proposed STS signal provides a meansfor high quality wideband channel estimation for the use of coordinatedtechniques, such as coordinated beamforming. Based on the proposed STS, twodistributed dynamic IM schemes, ON/OFF power control and SLNR(signal-to-leakage-plus-noise-ratio)-based transmitter beam coordination, areproposed. Simulation results show significant performance improvement as aresult of the use of STS-based IM schemes.

Distributed Dynamic Inter-Cell Interference Management for Femtocell Networks Using Over-the-Air Single-Tone Signaling