Energy-aware sensor selection and scheduling in wireless sensor networks

Type
Conference Paper

Authors
Bitar, Eilyan
Baeyens, Enrique
Poolla, Kameshwar

Date
2009-12-01

Abstract
This paper is concerned with system level energy management in wireless sensor networks. The network is required to conduct certain tasks which require information from individual sensors to be sent to a base station. Sensors cease functioning when they deplete their energy reserves or may fail abruptly due to random malfunctions. Sensor selection refers to the number of times sensors are interrogated, while sensor scheduling refers to the sequence in which these interrogations are conducted. A sensor management layer that isolates the system objectives from selection/scheduling is proposed. It is shown that sensor selection reduces to integer linear programming. Sensor scheduling is necessary when random sensor failures are considered or when the task definition is not stationary. Some general principles emerge. If all sensors are equally reliable, the optimal policy is to use the most energetic sensors first. If all sensors are equally energetic, the optimal policy is to use the least reliable sensor first.

Acknowledgements
Supported in part by OOF991-KAUST US LIMITED under award number 025478, and the UC Discovery Grant ele07-10283 under the IMPACT program.

Conference/Event Name
1st IFAC Workshop on Estimation and Control of Networked Systems, NecSys'09

DOI
10.3182/20090924-3-IT-4005.0105

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