Energy-efficient surveillance system using wireless sensor networks
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Medium access control with coordinated adaptive sleeping for wireless sensor networks
IEEE/ACM Transactions on Networking (TON)
On k-coverage in a mostly sleeping sensor network
Proceedings of the 10th annual international conference on Mobile computing and networking
Towards optimal sleep scheduling in sensor networks for rare-event detection
IPSN '05 Proceedings of the 4th international symposium on Information processing in sensor networks
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Motivated by the recent and rapidly increasing interest in energy-saving schemes, this paper presents a novel PHY/MAC layer design for wireless sensor networks (WSNs). Capitalizing on the observed rare-event feature of most WSNs, we first design an energy-efficient ternary modulation scheme wherein the modulated symbols can classify (or color) the state of the underlying phenomenon as green, yellow or red. Introducing this new notion of a yellow message (that lies between the binary values represented by green and red) results in great flexibility and energy savings when designing a MAC sleeping scheduler (turning nodes on-and-off). The proposed sleeping protocol enjoys low energy consumption and respects a latency constraint by efficiently using the time-division-multiple-access technique along with the ternary modulation scheme. Numerical results illuminate the energy savings provided by the proposed schemes and quantify the energy-latency tradeoffs.