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Subject: Krishna Sivalingam on "Design and Analysis of Energy Efficient Network Protocols for Large-Scale Wireless Sensor Networks",2002-02-07 @ 13:00:00 UMBC
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                         Colloquium                         
                            UMBC                            
             13:00:00 on 2002-02-07 in 210I ECS             

"Design and Analysis of Energy Efficient Network Protocols for Large-Scale Wireless Sensor Networks"

                     Krishna Sivalingam                     
Associate Professor, School of EE & CS, Washington State University
Abstract

Tremendous technological advances have been made in the development of
low-cost sensor devices equipped with wireless network interfaces. The
design of large-scale sensor networks interconnecting several hundred
sensor nodes has attracted recent research attention. Given the low
computation and low battery power capacities of sensor nodes, we view
scalability, energy efficiency and simplicity as important network and
protocol design factors. In this research, we consider a multi-hop
sensor network architecture consisting of a few hundred sensor nodes
that communicate data to a more powerful base-station. We first present
energy-efficient data gathering algorithms required to allow sensors to
transmit data to a base station. Then, we relax some of the constraints
on the sensor network and present a multi-level, multi-hop unified
protocol framework that provides network organization, medium access
control (MAC) and routing functionality. The MAC protocol, based on TDMA
access, is designed to be collision-free, energy-efficient and fair. The
routing protocol is multi-hop and uses a simple layer-based forwarding
mechanism. This reduces the number of control packets that need to be
transmitted and hence reduces energy and computation costs. If time
permits, the talk will also a proactive rendezvous mechanism for power
conservation. This mechanism makes a node establish pre-determined
communication time instance with its neighbors, and sleep all at other
times. The performance of the network, in terms of delay, throughput and
energy usage is studied for a wide range of parameters using
discrete-event simulation. This research has been supported by Air
Force Office of Scientific Research and DoD Laboratory for
Telecommunications Sciences.

Dr. Krishna Sivalingam is an Associate Professor in the
School of Electrical Engineering and Computer Science, at Washington
State University, Pullman, where he was an Assistant Professor from 1997
to 2000. From 1994 to 1997, he was an Assistant Professor at
University of North Carolina Greensboro. From February to May 2001, he
held the position of Principal Network Architect at Jasmine Networks in
San Jose, CA. During summer months of 1996 and 1997, he conducted
research at Lucent Technologies' Bell Labs in Murray Hill, NJ, and at
AT&T Labs in Whippany, NJ respectively. He also served as consultant to
AT&T Labs during 1997. He received his Ph.D. and M.S. degrees in
Computer Science in 1994 and 1990 respectively from State University of
New York at Buffalo where he was a Presidential Fellow from 1988 to
1991. Prior, he received his B.E. degree in Computer Science and
Engineering in 1988 from Anna University, Madras, India. His research
interests include wireless and mobile networks, optical WDM networks,
and performance evaluation. He has published more than twenty journal
and several refereed conference papers, and holds 3 patents in wireless
networks. He is co-recipient of the Best Paper Award at IEEE
International Conference on Networks (ICON 2000) held at Singapore in
Sep. 2000. He served as Lead Guest Editor for a special issue of the
IEEE Journal on Selected Areas in Communications in optical WDM
networks. Dr. Sivalingam has co-edited a book on optical WDM networks,
published by Kluwer Academic Publishers in March 2000. He is serving as
TPC Co-Chair for SPIE/ACM OPTICOMM 2002, and has served on committees of
several conferences including ACM Mobicom 1999 and 2001, SPIE Opticomm
2000 and 2001, IEEE ICNP 2001 and IEEE INFOCOM 1997.