Table of Contents
ISRN Sensor Networks
Volume 2013, Article ID 610796, 7 pages
Research Article

Prolonging the Lifetime of Two-Tiered Wireless Sensor Networks with Mobile Relays

1Department of Health & Welfare Units Administration, Technology Education Institute of Kalamata, 24100 Kalamata, Greece
2Department of Information Technology and Telecommunications, Technology Education Institute of Larissa, 411 10 Larissa, Greece

Received 31 December 2012; Accepted 26 January 2013

Academic Editors: C.-Y. Chow, S. Ozdemir, and Y. Yu

Copyright © 2013 Theodore C. Kotsilieris and George T. Karetsos. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a clustering scheme for wireless sensor nodes in hierarchical wireless sensor networking architectures that employs mobile relay nodes in order to achieve energy conservation and network lifetime prolongation. The key aspects of our scheme are relay node relocation and reclustering when failures are detected. The performance of the proposed approach is evaluated via simulations for various topology layouts based on the sensor node population and number of mobile relay nodes employed. The results show significant energy savings in particular for topologies with large numbers of sensors.