Graph colouring based fractional frequency reuse for enterprise femtocell networks

摘要

In this study, the authors propose a novel dynamic channel assignment scheme called graph colouring based fractional frequency reuse (GC-FFR) to improve system performance for the downlink of enterprise femtocell networks based on orthogonal frequency division multiple access with frequency division duplex. In order to mitigate co-tier interference from neighbour femtocell access points, the proposed GC-FFR scheme uses a heuristic method that consists of two steps: multiple femtocell user equipment (FUE) clustering step and dynamic subchannel assignment step. Simulation results show that the proposed GC-FFR scheme outperforms other schemes in terms of the mean FUE capacity and unsatisfied FUE probability.