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Fourth Annual IEEE Communications Society Conference on Sensor,
Mesh and Ad Hoc Communications and Networks SECON 2007
Merged with IEEE International Workshop on Wireless Ad-hoc and Sensor Networks (IWWAN)
June 18-21, 2007, San Diego, California, USA
Keynote Speech
Multi-Channel Wireless Networks: Theory to Practice
Prof. Nitin H. Vaidya
Department of Electrical and Computer Engineering, and
Coordinated Science Laboratory
University of Illinois at Urbana-Champaign
Abstract:
Wireless technologies, such as IEEE 802.11, provide for multiple
non-overlapping channels. With the availability of multiple channels,
network capacity may be increased by using all the available channels within
a given network. However, the number of interfaces per node in a network is
expected to be typically much smaller than the number of channels, and
therefore a single node cannot simultaneously use all the channels.
In this talk, we present capacity results for multi-channel wireless
networks, considering constrained as well as unconstrained channel
assignments. In the constrained channel assignment scenario, we show that
for a random network of n nodes using just one interface each,
asymptotically, there is no capacity degradation so long as the number of
channels is O(log n).
The capacity results indicate that, in theory, multiple channels can be used
within a single network to improve network capacity significantly, even with
a small number of interfaces per node. However, in practice, many challenges
have to be addressed before the capacity improvement can be realized. This
talk will present the insights obtained from the capacity analysis, which
are useful in
designing practical multi-channel protocols for wireless mesh and ad hoc
networks, and also discuss some of the design
decisions made while implementing the Net-X multi-channel multi-interface
testbed at the University of Illinois.
This talk is based on joint research with graduate students Vartika Bhandari,
Rishi Bhardwaj, Chandrakanth Chereddi, Pradeep Kyasanur and Nistha Tripathi.
Biography
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Nitin Vaidya received Ph.D. from the University of Massachusetts at Amherst.
He is presently a Professor of Electrical and Computer Engineering at the
University of Illinois at Urbana-Champaign. He has held visiting positions
at Microsoft Research, Sun Microsystems and the Indian Institute of
Technology-Bombay. His current research is in wireless networking and mobile
computing. He co-authored papers that received
awards at 1998 ACM MobiCom and 2003 Personal Wireless Communications (PWC)
conferences. Nitin is a recipient of a CAREER award from the National
Science Foundation. He served as program co-chair for 2003 ACM MobiCom and
General Chair for 2001 ACM MobiHoc, and
presently serves as the Editor-in-Chief for the IEEE Transactions on Mobile
Computing. For more information, please visit
http://www.crhc.uiuc.edu/wireless/.
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