Energy efficiency maximization in ultra dense heterogeneous cellular network, considering both downlink and uplink

This is the authors' abstract. We don't add key points for this paper.

Analysis of data traffic in the cellular network indicates that its growing trend will continue. Therefore, it needs to increase the cellular network's capacity. Heterogeneous cellular network is a promising solution for improving energy and spectrum efficiency. On the other hand, due to the limited energy of the batteries, the signals sent by the User Equipment (UE) are not strong and will be attenuated by the destructive factors (such as path loss). Therefore, considering some parameters related to power consumption of UE can improve the quality of uplink signals with an acceptable power usage. In this paper, a novel scheme is proposed for heterogeneous cellular network, which utilizes cell switch on/off and continuous cell zooming techniques. The scheme aims at maximizing energy efficiency, defined in both downlink and uplink. In the proposed scheme, an optimization problem is defined whose utility function aims to maximize energy efficiency. PSO method is used to solve the problem. The results show that when the number of users increases, the proposed scheme achieves lower energy consumption and higher energy and spectral efficiency compared to the previous studies.