Adaptive soft frequency reuse scheme for inbuilding dense femtocell networks

Femtocell networks have emerged as a key technology in residential, office building or hotspot deployments that can significantly improve the coverage and performance of next-generation wireless networks. But, in the co-channel deployment scenarios, dense inter-femto interference might significantly deteriorate the overall system performance. In this paper, a new adaptive soft frequency reuse scheme in the dense femtocell networks is proposed where multiple dominant interference from dense femtocells is classified into a number of groups, and different frequency reuse factors and transmit powers for these groups are adjusted adaptively to mitigate the mutual interference. Simulation results show the proposed scheme yields great performance gains in terms of the spectrum efficiency relative to the legacy soft frequency reuse and universal frequency reuse.