Adaptive Sleeping Technique to Improve Energy Efficiency in Ultra-Dense Heterogeneous Networks

This paper presents a new base station sleeping method to reduce the power consumption in the ultra-dense heterogeneous networks (HetNets). HetNets comprises of several small cells, like femtocells, in a small geographical area. The previous sleeping methods focused on minimizing the total consumed power and the energy efficiency was not considered. The proposed adaptive sleeping method in this paper is based on the maximization of the minimum energy efficiency of femtocells. Therefore, the femtocell base station (FBS) with minimum energy efficiency is the candidate for sleeping and its traffic are offloaded to the near FBSs. This process continues until the minimum energy efficiency of the FBSs is improved. Simulation results show that the proposed adaptive sleeping method enhances the minimum energy efficiency of small cell network.