Decentralized spectrum sharing with beamforming in two-tier femtocell networks
نویسندگان
چکیده
Two-tier overlay networks that consist of a conventional macrocell network and femtocell hotspots offer an economical solution for high capacity and extended coverage. However, wireless interference across tiers significantly degrades network performance by restricting spectrum reuse. In this paper, we explore schemes to mitigate cross-tier interference using beamforming in overlay networks. In our model, femtocells can operate with frequency spectrum that is either shared with or separated from the macrocell. The enhanced signal to interference ratio (SIR) from beamforming can contribute to the shared-spectrum population of femtocells and thus improve the spectrum efficiency. We develop a decentralized scheme that solves the spectrum sharing problem to maximize total cell capacity.Through performance evaluation, we show that our proposed scheme significantly improve cell capacity in two-tier overlay networks.
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