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Tridimensional frequency reuse based interference mitigation strategy in two-tier femtocell networks

Dense femtocell deployment in macrocell system is an important tendency in future cellular networks due to the increasing demand in indoor communications, where the cross-tier interference mitigation between the macrocell and femtocells is one of the most critical issues. However, the current studies mostly focus on the cross-tier interference in two-dimensional scenarios with a few works considering the tridimensional cell. In this paper, based on the traditional fractional frequency reuse (FFR) method, we propose a novel tridimensional frequency reuse (TFR) strategy to mitigate the cross-tier interference in two-tier femtocell networks. We analyze the performance of the proposed strategy and compare it with the traditional FFR method and the original co-channel method. Simulation results demonstrate the effectiveness of our proposed strategy on interference mitigation in the tridimensional cell.