Fundamentals of access control in femtocells

doi:10.1017/CBO9781139061421.004

2 - Fundamentals of access control in femtocells

Published online by Cambridge University Press: 05 May 2013

Ping Xia ,

Han-Shin Jo and

Jeffrey G. Andrews

Edited by

Tony Q. S. Quek ,

Guillaume de la Roche ,

İsmail Güvenç and

Marios Kountouris

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Ping Xia: Affiliation:
University of Texas at Austin
Han-Shin Jo: Affiliation:
University of Texas at Austin
Jeffrey G. Andrews: Affiliation:
University of Texas at Austin
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

Access control in femtocell deployments

One unique trait of femtocells is that they are paid, installed, and managed by the end users. Compared with macrocells, which are installed by the network operators and thus can be accessed by any user, femtocells can choose the set of users that is allowed for access. In the simplest scenario, the femtocell can be configured for either: (i) closed access, where only registered home users can use the femtocell; or (ii) open access where any nearby users are allowed to use the femtocell. The choice of femtocell access control involves many important issues in two-tier femtocell networks [1-6].

The first important issue is cross-tier interference. Unlike wireless fidelity (WiFi) access points, femtocells serve users in licensed spectrum to guarantee quality of service (QoS) and because the devices they communicate with are developed for those frequencies. Compared to allocating separate channels inside the licensed spectrum exclusively to femtocells, sharing spectrum would be preferred from an operator perspective [1, 5, 7]. However, the co-channel spectrum sharing between femtocells and macrocells potentially gives rise to serious cross-tier interference in closed access. As shown in Figures 2.1 and 2.2, in closed access a cellular user, even when it is geographically close to a femtocell, is forced to communicate with the distant macro base station (BS). Therefore, this cellular user suffers from strong downlink interference from the nearby femtocell (see Figure 2.1), and likewise causes strong uplink interference to that femtocell (see Figure 2.2) [8-10].

Information

Type: Chapter
Information: Small Cell Networks
Deployment, PHY Techniques, and Resource Management
, pp. 13 - 43

DOI: https://doi.org/10.1017/CBO9781139061421.004 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2013

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