On Stochastic Cell Association Scheme Over Carrier Aggregated Heterogenous Networks

Triggered by the ever growing demand of wireless data rate, modern cellular network is in the middle of a paradigm shift. By deploying small cells underlaying current macrocells, a heterogeneous network (HetNet) architecture is formed with great potentials to improve system capacity and reduce overall energy consumption in the mean time. However, such layout is challenged by the co-tier and crosstier interference and uneven traffic loads due to the massive deployment of small cells. In this work, a cell association scheme based on stochastic control theory is explored to attain improved network performance in carrier aggregated HetNets. Simulation results have shown the advantages of the proposed scheme under different kinds of carrier deployments across multiple tiers.