Femtocells widely deployed in a macrocell forms hierarchical cell networks, has been regarded as one of the most promising approach. However owing to the absence of coordination between the macro and femtocells, and among femtocells, decentralized spectrum allocation between macro and femtocell users become technically challenging. In this paper, an optimal spectrum allocation scheme based on Stackelberg game is proposed, in which femto and macrocell base stations are players, and the same spectrum is the resource players will choose to assign users to minimize the affected interference among each other. The comparison results show that the proposed scheme might be a solution for efficiently allocating the spectrum in hierarchical cell networks, as the improvement in terms of outage probability and spectrum efficiency had been achieved.
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