Deployment of Small Cells with Biased Density in Heterogeneous Networks

Heterogeneous network systems were proposed to cope with explosively increased data traffic in wireless communications networks. In heterogeneous networks, small cells are additionally deployed to offload the data traffic of a macrocell, which results in highly improved data traffic capacity. Locational property of small cells affects the capacity of small cell networks significantly. In this paper, we propose a scheme for small cell deployment where cells are placed in a biased manner, i.e. spatially non-uniform deployment. Furthermore, we control the density of small cell distribution, and obtain improved network capacity as well as keeping the minimum-distance-constraint between macrocells and small cells. Computer simulation results show that the proposed approach increases the network throughput significantly compared to various existing schemes.