Differentiated Surveillance for Sensor Networks
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For many sensor network applications such as military surveillance, it is necessary to provide full sensing coverage to a security-sensitive area while at the same time minimize energy consumption and extend system life by leveraging the redundant deployment of sensor nodes. It is also preferable for the sensor network to provide differentiated surveillance service for various target areas with different degrees of security requirements. In this paper, we propose a differentiated surveillance service for sensor networks based on an adaptable energy-efficient sensing coverage protocol. In the protocol, each node is able to dynamically decide a schedule for itself to guarantee a certain degree of coverage (DOC) with average energy consumption inversely proportional to the node density. Several optimizations and extensions are proposed to provide even better performance. Simulation shows that our protocol accomplishes differentiated surveillance with low energy consumption. It outperforms other state-of-art schemes by as much as 50% reduction in energy consumption and as much as 130% increase in the half-life of the network.
Design Goals
The basic design goal for this work is to provide energy efficient sensing coverage for a geographic area covered by sensor nodes. Though it has been addressed in several previous works, our work distinguishes itself from previous solutions in following sub-goals that we achieve.
Reduce total amount of energy consumed.
Reduce energy variation among nodes.
Reduce communication overhead in establishing nodes¡¯ work schedule.
Support new extension for differentiated surveillance with small overhead.
Provide communication connectivity as an auxiliary benefit.
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