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Title: Energy consumption in wireless sensor networks under varying sensor node traffic
Authors: Fapojuwo, AO
Tse, CK 
Lau, FCM 
Keywords: Energy efficiency
Stochastic programming
Traffic uncertainty
Wireless sensor networks
Issue Date: 2010
Source: IEEE Wireless Communications and Networking Conference, WCNC, 2010, 5506500 How to cite?
Abstract: This paper studies the problem of energy consumption minimization in wireless sensor networks (WSNs) under uncertainty in sensor node generated traffic. It is important to consider traffic uncertainty because WSNs designed for surveillance and monitoring applications typically operate in event-driven and query-driven modes for which the node generated traffic changes from instant to instant. The problem is formulated as a two-stage stochastic linear program with recourse where the objective is to minimize the sum of the energy cost expended on the carried traffic and the average energy cost of blocked traffic, under the constraint of a fixed energy budget at each node. The stochastic programming formulation lends to the consideration of two approaches for handling the randomly generated traffic: a deterministic approach in which all future generated random traffic are constrained by the link flows determined for the nominal traffic, and a stochastic approach where the link flows are adapted as the node generated traffic changes. Numerical results show that, compared to the deterministic approach, the stochastic approach provides up to 10% savings in network-level energy consumption and this is achieved without a loss in received data quality. The network-level energy savings translate to a prolonged network lifetime.
Description: IEEE Wireless Communications and Networking Conference 2010, WCNC 2010, Sydney, NSW, 18-21 April 2010
ISBN: 9781424463985
ISSN: 1525-3511
DOI: 10.1109/WCNC.2010.5506500
Appears in Collections:Conference Paper

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