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13 - New strategies for femto-macro cellular interference control

Published online by Cambridge University Press:  05 May 2013

By
Sundeep Rangan
Edited by
Tony Q. S. Quek ,
Guillaume de la Roche ,
İsmail Güvenç  and
Marios Kountouris
Sundeep Rangan
Affiliation:
Polytechnic Institute of New York University
Tony Q. S. Quek
Affiliation:
Singapore University of Technology and Design
Guillaume de la Roche
Affiliation:
Mindspeed Technologies
İsmail Güvenç
Affiliation:
Florida International University
Marios Kountouris
Affiliation:
SUPÉLEC (Ecole Supérieure d'Electricité)
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Summary

Femto-macro interference coordination problem

Femtocells are small wireless access points that are typically installed in a subscriber's premises, but operate in a cellular provider's licensed spectrum. Since femtocells can be manufactured at a very low cost, require minimal network maintenance by the operator, and can leverage the subscriber's backhaul, femtocells offer the possibility of expanding cellular capacity at a fraction of the cost of traditional macrocellular deployments. With the surge in demand for wireless data services, femtocells have thus attracted considerable recent attention, both in cellular standards bodies such as the 3rd Generation Partnership Project (3GPP) [1–3] and academic research [4, 5].

However, one of the key technical challenges in deploying femtocells is the interference between the underlay of small femtocells and the overlay of comparatively large macrocells – an issue raised in virtually every survey on femtocells [5–8]. While interference is a fundamental challenge in any cellular system, the so-called cross-tier interference in femtocell networks has two particularly challenging aspects:

1. Strong and varied interference: Due to closed access or restricted association, mobile terminals (or user equipment (UE) in 3GPP terminology) may not be able to connect to a given femtocell even when it provides the closest serving base station [9]. Such restrictions can result in strong interference both from the macrocell UE transmitter onto the femtocell uplink and from the femtocell downlink onto the macrocell UE receiver. In addition, since the femtocell access points are often deployed in an essentially ad hoc manner, interference conditions are much more varied than traditional planned macrocellular networks.

Information

Type
Chapter
Information
Small Cell Networks
Deployment, PHY Techniques, and Resource Management
 , pp. 311 - 331
Publisher: Cambridge University Press
Print publication year: 2013

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