Increasing of energy efficiency in heterogeneous networks through microcells

DOI №______

Abstract

With the exponential growth of mobile data traffic, which is caused by a new generation of wireless devices, cellular networks face a big challenge in order to meet the high demand for network bandwidth. At the same time, subscriber's need for higher data rate and the ever growing number of wireless users has led to a rapid increase in electricity consumption and operating costs of cellular networks. This gave impetus to the creation of energy-efficient telecommunications. One of the innovations in this area is Heterogeneous Network (HetNet), in which cells of low power consumption (microcells, picocells and femtocells) can be used. In this paper we consider the superposition of microcells on a network that consists of macrocells in order to investigate how microcells affect the energy efficiency of a heterogeneous network. The main parameters for analytical modeling of the heterogeneous network architecture, which are necessary for performing calculations, are described. Energy efficiency is calculated, which takes into account three aspects that affect it: the number of microcells, their radius, and the distance between macrocell sites. Also, this article takes into account the scenarios of different number of users in a heterogeneous network, which made it possible to obtain the optimal variant for energy efficiency and determine the necessary quantitative values for the radius of microcells, the number of microcells, the distance between sites for macrocells and the dependency graphs. It is shown that the use of microcells is appropriate for a large number users, because microcells also improve the coverage of the network on the edge of macrocells and should not stand idle, that is, use the energy of the network, but not perform ain functions of the network.

Keywords: heterogeneous network; energy efficiency; spectral efficiency.

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