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Issue No.04 - October (2004 vol.3)
pp: 305-306
Published by the IEEE Computer Society
Energy efficiency is critical to ensuring scalability, embedding, and portability of emerging computing and communication systems. It is of particular interest in the design of mobile computing systems because of the limitations in energy and power availability. In this special section, we focus on energy efficiency in design of ad hoc wireless sensor networks. The inspiration for this theme focus came from the IEEE/JPL Workshop on Wireless Communications and Networks held at the Jet Propulsion Laboratories in September 2002. After two rounds of a thorough review process, we are pleased to present you two papers concerning energy efficient networking functions for sensor networks.
The first paper titled, "Multiple Access Protocol for Power Controlled Wireless Access Networks," by Arash Behzad and Izhak Rubin considers the problem of power controlled medium access in wireless networks. The authors use a network architecture consisting of a wireless access network supported by a backbone network. While the backbone network allocates slots for the nodes in the access network to access the shared medium, the nodes in the access network make power efficient networking decisions. The authors show the advantages in increasing network throughput while maintaining specified minimum signal to interference and noise ration at all the receiver nodes.
The second paper titled, "Methods for Scalable Self-Assembly of Ad Hoc Wireless Sensor Networks," by Katayoun Sohrabi, William Merrill, Jeremy Elson, Lewis Girod, Fredric Newberg, and William Kaiser presents a link level strategy to drive the self-assembly for ad hoc sensor networks. The authors use innovations in network formation mechanisms that rely on hierarchical network topology and use dual radios to improve the power efficiency of the network assembly and maintain network connectivity in presence of network changes including removal/addition of new nodes.
These two papers are representative of the range of possibilities in improving energy efficiency in networking functions. While the focus on networking related issues is natural in ad hoc wireless sensor networks due to the dominance of the communications/networking functions on total power consumption profile as well as the natural evolution of research in this area, we sincerely believe that power efficiency cuts across sensing, computing, and communication subsystems, and future contributions in this area to the IEEE Transactions on Mobile Computing will surely highlight these other aspects.
We thank our reviewers for their diligence in the review process and its follow up to ensure that the published papers represents substantial and new technical advances in the area; and to our authors for their patience with the multiple iterations of the review process. Our thanks to EIC, Tom La Porta, and transactions assistant Jennifer Carruth for making this issue possible. We hope you enjoy this special section.
Rajesh Gupta Mani Srivastava Guest Editors

    R. Gupta is with the Department of Computer Science and Engineering, University of California, San Diego, AP&M 3111, 9500 Gilman Drive, La Jolla, CA 92093-0114. E-mail: rgupta@cs.ucsd.edu.

    M. Srivastava is with the Electrical Engineering Department, University of California, Los Angeles, 6731-H Boelter Hall, MC #951594, Los Angeles, CA 90095-1594. E-mail: mbs@ucla.edu.

For information on obtaining reprints of this article, please send e-mail to: tmc@computer.org.



Rajesh Gupta received the BTech degree in electrical engineering from IIT Kanpur, India, the MS degree in electrical engineering and computer science from the University of California at Berkeley, and the PhD degree in electrical engineering from Stanford University. He is a professor in the Department of Computer Science & Engineering at the University of California at San Diego, California. He holds the Qualcomm endowed chair in embedded microsystems. He is author/coauthor of more than 150 articles on various aspects of embedded systems and design automation and four patents on PLL design, data-path synthesis, and system-on-chip modeling. Dr. Gupta is a recipient of the Chancellor's Fellow at UC Irvine, the UCI Chancellor's Award for excellence in undergraduate research, the US National Science Foundation CAREER Award, two Departmental Achievement Awards, and a Components Research Team Award at Intel. He is editor-in-chief of IEEE Design & Test of Computers and serves on the editorial boards of IEEE Transactions on CAD and IEEE Transactions on Mobile Computing. He is a fellow of the IEEE and a distinguished lecturer for the ACM/SIGDA and the IEEE CAS Society.



Mani Srivastava received the PhD degree in electrical engineering and computer science from the University of California at Berkeley in 1992. Currently, he is a professor on the Electrical Engineering Faculty at the University of California at Los Angeles where he directs the Networkedand Embedded Systems Laboratory ( http://nesl.ee.ucla.edu). He is also associated with the UCLA Center for Embedded Networked Sensing (CENS), a US National Science Foundation (NSF) Science Technology Center. He coleads the systems area research at CENS, and is also a deputy director of the center. Prior to joining UCLA in 1996, for five years he was a member of the Networked Computing Research Department at the Bell Laboratories, Murray Hill, New Jersey. His current interests are in embedded sensor and actuator networks, wireless and mobile systems, embedded system, power-aware computing and communications, and ubiquitous computing. He has published more than 125 papers and book chapters in these areas, and has received five US patents. He currently serves on the editorial boards of the IEEE Transactions on Mobile Computing and the ACM Transactions on Sensor Networking, and has been program cochair for ACM MobiHoc '03, ACM SenSys '03, and IEEE/ACM IPSN '05. He is a senior member of the IEEE, and has been a recipient of the US NSF CAREER Award, the Okawa Foundation Grant, and the President of India's Gold Medal. He is a senior member of the IEEE.
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