Interference Management in Femtocells

Abstract

Abstract-Increase in system capacity and data rates can be achieved efficiently in a wireless system by getting the transmitter and receiver closer to each other. Femtocells deployed in the macrocell significantly improve the indoor coverage and provide better user experience. The femtocell base station called as Femtocell Access Point (FAP) is fully user deployed and hence reduces the infrastructure, maintenance and operational cost of the operator while at the same time providing good Quality of Service (QoS) to the end user and high network capacity gains. However, the mass deployment of femtocell faces a number of challenges, among which interference management is of much importance, as the fundamental limits of capacity and achievable data rates mainly depends on the interference faced by the femtocell network. To cope with the technical challenges including interference management faced by the femtocells, researchers have suggested a variety of solutions. These solutions vary depending on the physical layer technology and the specific scenarios considered. Furthermore, the cognitive capabilities, as a functionality of femtocell have also been discussed in this survey.This article summarises the main concepts of femtocells that are covered in literature and the major challenges faced in its large scale deployment. The main challenge of interference management is discussed in detail with its types in femtocells and the solutions proposed over the years to manage interference have been summarised. In addition an overview of the current femtocell standardisation and the future research direction of femtocells have also been provided.

Interference Mitigation in CR-Enabled Heterogeneous Networks

“…Authors in [4], [22], [38], [39] provided the overview of interference mitigation methods in the HetNet. These papers further classify the interference mitigation methods by using a novel taxonomy, which identifies the major dimensions of an interference mitigation method: radio resource domain of achieving orthogonality and method of acquiring information.…”

Opportunistic distributed channel access for a dense wireless small‐cell zone

“…The signal-to-interference plus noise ratio (SINR) needs to be above a detectable threshold Γ th as well [28]. Let N bik denote the set of the home-SUEs of SAP b i except SUE i , that transmits on channel k. Let N −bik denote the set of SUEs of SAPs M {b i } that transmits on channel k. Their cardinalities are denoted by N bik and N −bik respectively.…”

LTE-Advanced Radio Access Enhancements: A Survey

“…Since all the available spectrum is usually assigned to the macro cells, different cell layers often have to use the same frequency [128]. This may cause interference issues which should be managed effectively in HetNets.…”