A joint power and subchannel allocation scheme maximizing system capacity in dense femtocell downlink systems

Femtocell system is expected to bring significant improvement of system performance with low cost. However, when a number of femto BSs are installed by users without cell-planning, the femtocell system will be in dense environment, in which many femto co-cells exist in a small region and a great portion of the femto cell is overlapped by other femto cells. Femtocell system in dense environment is exposed to strong inter-cell interference problem which is critical to system capacity. In this paper, we derive a joint power and subchannel allocation scheme in dense environment. The simulation and numerical results show that our proposed scheme simply finds a better solution compared to the conventional scheme in dense environment.