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Title: Interference-free wakeup scheduling with consecutive constraints in wireless sensor networks
Authors: Ma, J
Lou, W 
Issue Date: 2012
Source: International journal of distributed sensor networks, v. 2012, 525909, p. 1-17
Abstract: Wakeup scheduling has been widely used in wireless sensor networks (WSNs), for it can reduce the energy wastage caused by the idle listening state. In a traditional wakeup scheduling, sensor nodes start up numerous times in a period, thus consuming extra energy due to state transitions (e.g., from the sleep state to the active state). In this paper, we address a novel interference-free wakeup scheduling problem called compact wakeup scheduling, in which a node needs to wake up only once to communicate bidirectionally with all its neighbors. However, not all communication graphs have valid compact wakeup schedulings, and it is NP-complete to decide whether a valid compact wakeup scheduling exists for an arbitrary graph. In particular, tree and grid topologies, which are commonly used in WSNs, have valid compact wakeup schedulings. We propose polynomial-time algorithms using the optimum number of time slots in a period for trees and grid graphs. Simulations further validate our theoretical results.
Keywords: Active state
Arbitrary graphs
Communication graphs
Energy wastages
Grid graphs
Grid topology
Idle listening
NP complete
Optimum number
Polynomial-time algorithms
Scheduling problem
Sleep state
State transitions
Theoretical result
Time slots
Wireless sensor network (WSNs)
Publisher: Sage Publications, Inc.
Journal: International journal of distributed sensor networks 
ISSN: 1550-1329
EISSN: 1550-1477
DOI: 10.1155/2012/525909
Rights: Copyright © 2012 Junchao Ma and Wei Lou. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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