Wireless Sensor Networks 4th European Conference, EWSN 2007, Delft,

This volume contains the proceedings of EWSN 2007, the fourth European c- ference on Wireless Sensor Networks. The conference took place at TU Delft, January 29–31, 2007. Its objective was to provide a forum where researchers with di?erent experience and

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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Koen Langendoen Thiemo Voigt (Eds.)

Wireless Sensor Networks 4th European Conference, EWSN 2007 Delft, The Netherlands, January 29-31, 2007 Proceedings

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Volume Editors Koen Langendoen Delft University of Technology 2628 CD Delft, The Netherlands E-mail: [email protected] Thiemo Voigt Swedish Institute of Computer Science Box 1263, SE-164 29 Kista, Sweden E-mail: [email protected]

Library of Congress Control Number: 2006939921 CR Subject Classification (1998): C.2.4, C.2, F.2, D.1.3, D.2, E.1, H.4, C.3 LNCS Sublibrary: SL 5 – Computer Communication Networks and Telecommunications ISSN ISBN-10 ISBN-13

0302-9743 3-540-69829-9 Springer Berlin Heidelberg New York 978-3-540-69829-6 Springer Berlin Heidelberg New York

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Preface

This volume contains the proceedings of EWSN 2007, the fourth European conference on Wireless Sensor Networks. The conference took place at TU Delft, January 29–31, 2007. Its objective was to provide a forum where researchers with different experience and background, from hardware to applications, would present and discuss the latest developments in the exciting field of wireless sensor networks. Since the interest in sensor networks has been rapidly expanding, it was no surprise that EWSN received a record number of 164 submissions, of which 22 papers were selected for the final conference. It was a p