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In cellular networks, it is estimated that 23 of calls and over 90% of data services occur indoors. However, some surveys show that many households and businesses experience a poor indoor coverage problem. It has been identified that poor coverage is the main reason for churn, which is very costly for operators in saturated markets. How to provide good indoor coverage cost effectively is thus a demanding challenge for operators.

The recent development of femtocells provides a fresh opportunity for operators to address the poor indoor coverage problem. Femtocells represent a more cost-effective solution than do other indoor solutions such as DAS (Distributed Antenna Systems) and picocells in indoor scenarios such as home and SOHO (Small Office and Home Office). Many operators such as Vodafone and AT&T have expressed a strong interest in femtocells and announced commercial launches of femtocells within their mobile networks, starting in the second half of 2009.

The deployment of a large number of femtocells (in particular, spectrum-efficient cochannel deployment) will have an impact on the macrocell layer. This impact and the performance of both macrocell and femtocell layers have to be fully evaluated before large-scale deployment. The evaluation can be done either through trials or simulationbased approaches. There is currently a lack of documentation that provides a comprehensive and organized explanation for the challenging issues arising from the deployment of femtocells in an existing macrocell network. We therefore believe that there is an urgent need for a book that covers femtocell technologies (such as femtocell architecture and air interface technologies) and the issues arising from femtocell deployment (such as interference modelling and mitigation, self-optimization, mobility management, etc.).

In recent years, CWiND has been funded by the EPSRC (Engineering and Physical Science Research Council) and the European Commission to research femtocells and indoor radio network design. These projects equipped us with a good understanding of femtocell technologies and the challenging issues arising from deployment of femtocells. It is also fortunate that CWiND could dedicate a large amount of human resources from February to June 2009 to the writing of this very much needed book.

Content:-

About the Authors

Preface

Acknowledgements

Acronyms

1. Introduction

2. Indoor Coverage Techniques

3. Access Network Architecture

4. Air-Interface Technologies

5. System-Level Simulation for Femtocell Scenarios

6. Interference in the Presence of Femtocells

7. Mobility Management