Distributed self-tuning of sensor networks |
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Authors: | Aditya Karnik Anurag Kumar Vivek Borkar |
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Affiliation: | (1) Dept. of Electrical and Computer Engg., University of Waterloo, Waterloo, N2L 3G1, Canada;(2) Dept. of Electrical Communication Engg., Indian Institute of Science, Bangalore, 560012, India;(3) School of Technology and Computer Science, Tata Institute of Fundamental Research, Mumbai, 400005, India |
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Abstract: | This work is motivated by the need for an ad hoc sensor network to autonomously optimise its performance for given task objectives
and constraints. Arguing that communication is the main bottleneck for distributed computation in a sensor network we formulate
two approaches for optimisation of computing rates. The first is a team problem for maximising the minimum communication throughput
of sensors and the second is a game problem in which cost for each sensor is a measure of its communication time with its
neighbours. We investigate adaptive algorithms using which sensors can tune to the optimal channel attempt rates in a distributed
fashion. For the team problem, the adaptive scheme is a stochastic gradient algorithm derived from the augmented Lagrangian
formulation of the optimisation problem. The game formulation not only leads to an explicit characterisation of the Nash equilibrium
but also to a simple iterative scheme by which sensors can learn the equilibrium attempt probabilities using only the estimates
of transmission and reception times from their local measurements. Our approach is promising and should be seen as a step
towards developing optimally self-organising architectures for sensor networks.
Aditya Karnik obtained his B.E. from the University of Pune, Pune, India, and M.E. and Ph.D. (2004) in electrical communication engg. from
the Indian Institute of Science, Bangalore, India. He is currently a postdoctoral fellow at the University of Waterloo, Waterloo,
Canada. He was a recipient of the IBM Research Fellowship. His research interests are in performance evaluation, optimisation
and control of communication networks.
Anurag Kumar obtained his B.Tech. degree from the Indian Institute of Technology at Kanpur, and the PhD degree from Cornell University,
both in Electrical Engineering. He was then with Bell Laboratories, Holmdel, N.J., for over 6 years. Since 1988 he has been
with the Indian Institute of Science (IISc), Bangalore, in the Dept. of Electrical Communication Engineering, where he is
now a Professor, and is also the Chairman of the department. From 1988 to 2003 he was the Coordinator at IISc of the Education
and Research Network Project (ERNET), India’s first wide-area packet switching network. His area of research is communication
networking, specifically, modeling, analysis, control and optimisation problems arising in communication networks and distributed
systems. Recently his research has focused primarily on wireless networking. He has been elected Fellow of the IEEE, and the
Indian National Science Academy (INSA), both from 2006, and has been a Fellow of the Indian National Academy of Engineering
(INAE) since 1998. He is an associate editor of IEEE Transactions on Networking, and of IEEE Communications Surveys and Tutorials.
He is a coauthor of the advanced text-book “Communication Networking: An Analytical Approach,” by Kumar, Majunath and Kuri,
published by Morgan-Kaufman/Elsevier.
Vivek Borkar got his B. Tech. (Elec. Engg.) from Indian Institute of Technology, Mumbai, in 1976, M. S. (Systems and Control) from Case
Western Reserve Uni. in 1977, and Ph.D. (Elec. Engg. and Computer Sci.) from the Uni. of California, Berkeley, in 1980. He
was with TIFR Centre, Bangalore (1982–1989) and Indian Institute of Science (1989–1999) before taking up his present position
at the School of Technology and Computer Science, Tata Inst. of Fundamental Research, Mumbai. He is a Fellow of the Indian
Academy of Sciences, Indian National Science Academy, Indian National Academy of Engineers and the IEEE. His research interests
are stochastic control, stochastic algorithms and applications. He is on the editorial boards of Sadhana, Systems and Control
Letters, SIAM J. Control and Optim., and Applicationes Mathematicae. He is the author of ‘Optimal Control of Diffusion Processes’
(Longman, 1989), ‘Topics in Controlled Markov Chains’ (Longman, 1991), ‘Probability Theory: An Advanced Course’ (Springer,
1995). |
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Keywords: | Sensor networks Maxmin optimization Games Stochastic algorithms |
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