Spectrum assignment and fairness in femtocell networks

doi:10.1017/CBO9781139061421.017

15 - Spectrum assignment and fairness in femtocell networks

Published online by Cambridge University Press: 05 May 2013

Mustafa Cenk Erturk ,

İsmail Güvenç ,

Sayandev Mukherjee and

Huseyin Arslan

Edited by

Tony Q. S. Quek ,

Guillaume de la Roche ,

İsmail Güvenç and

Marios Kountouris

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Mustafa Cenk Erturk: Affiliation:
University of South Florida
İsmail Güvenç: Affiliation:
Florida International University
Sayandev Mukherjee: Affiliation:
NTT Docomo USA
Huseyin Arslan: Affiliation:
University of South Florida
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

Introduction and prior art

Frequency allocation for heterogeneous networks

In heterogeneous networks, frequency resources can be allocated to different tiers in a co-channel (shared-spectrum) or dedicated channel (split-spectrum) manner, or through a hybrid technique, which is a combination of the two approaches. In the co-channel approach shown in Figure 15.1(a), while the spectrum resources are fully reused in different tiers, cross-tier interference may cause crucial setbacks to the system. For example, macrocell users in the vicinity of closed subscriber group (CSG) femtocells are not allowed to connect to the femtocells, even if their link quality with these femtocells is good. Therefore, such macrocell users receive strong downlink interference from CSG femtocells and may fall into outage.

The split spectrum approach shown in Figure 15.1(b), on the other hand, partitions the allocated spectrum between multiple tiers. Each tier can use its own segment of resource and therefore there is no cross-tier interference [1]. However, the amount of bandwidth available to each tier is reduced. Hybrid methods as shown in Figure 15.1(c) use a mixture of co-channel and dedicated channel methods, and aim to reuse the spectrum resources whenever feasible. For example, in [2], the macrocell users are dedicated a component carrier (CC), referred as the “escape carrier,” which is not used by the femtocell network. Any macrocell mobile station (MMS) that is close by to a femtocell is scheduled within this escape carrier, if the interference observed from the femtocell network is above a threshold.

Information

Type: Chapter
Information: Small Cell Networks
Deployment, PHY Techniques, and Resource Management
, pp. 357 - 382

DOI: https://doi.org/10.1017/CBO9781139061421.017 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2013

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