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Sensors 2009, 9(2), 696-716; doi:10.3390/s90100696

Energy Efficient Sensor Scheduling with a Mobile Sink Node for the Target Tracking Application

1,* , 1
1 Department of Mechanical Engineering, Melbourne School of Engineering, University of Melbourne, Australia 2 Advanced Computing and Simulation Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria, Australia
* Author to whom correspondence should be addressed.
Received: 14 November 2008 / Revised: 16 January 2009 / Accepted: 16 January 2009 / Published: 23 January 2009
(This article belongs to the Special Issue Wireless Sensor Technologies and Applications)
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Measurement losses adversely affect the performance of target tracking. The sensor network’s life span depends on how efficiently the sensor nodes consume energy. In this paper, we focus on minimizing the total energy consumed by the sensor nodes whilst avoiding measurement losses. Since transmitting data over a long distance consumes a significant amount of energy, a mobile sink node collects the measurements and transmits them to the base station. We assume that the default transmission range of the activated sensor node is limited and it can be increased to maximum range only if the mobile sink node is out-side the default transmission range. Moreover, the active sensor node can be changed after a certain time period. The problem is to select an optimal sensor sequence which minimizes the total energy consumed by the sensor nodes. In this paper, we consider two different problems depend on the mobile sink node’s path. First, we assume that the mobile sink node’s position is known for the entire time horizon and use the dynamic programming technique to solve the problem. Second, the position of the sink node is varied over time according to a known Markov chain, and the problem is solved by stochastic dynamic programming. We also present sub-optimal methods to solve our problem. A numerical example is presented in order to discuss the proposed methods’ performance.
Keywords: Sensor Scheduling; Dynamic Programming; Markov Model; Target Tracking Sensor Scheduling; Dynamic Programming; Markov Model; Target Tracking
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Maheswararajah, S.; Halgamuge, S.; Premaratne, M. Energy Efficient Sensor Scheduling with a Mobile Sink Node for the Target Tracking Application. Sensors 2009, 9, 696-716.

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