Diminution of Co-channel Interference in Femtocell Networks

Abstract

In the field of telecommunications, a femtocell is defined as a low-power cellular base station that is typically designed for use in a home or small business. A broader term which is more widespread in the industry is small cell, with femtocell as a subset. It acts as a service provider that allows to extend service coverage indoors or at the cell edge, especially where access would otherwise be limited or unavailable. In multiple-access communication systems several users share the system resources, thus creating cochannel interference to each other. In order to dimulate possible co-channel
interferences we use the concept of cognitive radio (CR) that allows to overlay between macro cell and femtocells has been considered an optimal solution. Cognitive radio functionality can be implemented in femtocell networks based on an overlay mechanism under the assumption of a hierarchical access and in co-channel deployment scenario. In this survey paper, we give in-depth theoretical analysis on media access protocol using discrete-time Markov chain analysis to validate the effectiveness of the proposed architecture.