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Issue No.12 - Dec. (2012 vol.24)
pp: 2274-2287
Mao Ye , Pennsylvania State University, University Park
Ken C.K. Lee , University of Massachusetts Dartmouth, North Dartmouth
Wang-Chien Lee , Pennsylvania State University, University Park
Xingjie Liu , Pennsylvania State University, University Park
Meng-Chang Chen , Academia Sinica, Taipei
ABSTRACT
In this paper, we introduce two types of probabilistic aggregation queries, namely, Probabilistic Minimum Value Queries (PMVQ)s and Probabilistic Minimum Node Queries (PMNQ)s. A PMVQ determines possible minimum values among all imprecise sensed data, while a PMNQ identifies sensor nodes that possibly provide minimum values. However, centralized approaches incur a lot of energy from battery-powered sensor nodes and well-studied in-network aggregation techniques that presume precise sensed data are not practical to inherently imprecise sensed data. Thus, to answer PMVQs and PMNQs energy-efficiently, we devised suites of in-network algorithms. For PMVQs, our in-network minimum value screening algorithm (MVS) filters candidate minimum values; and our in-network minimum value aggregation algorithm (MVA) conducts in-network probability calculation. PMNQs requires possible minimum values to be determined a prior, inevitably consuming more energy to evaluate than PMVQs. Accordingly, our one-phase and two-phase in-network algorithms are devised. We also extend the algorithms to answer PMNQ variants. We evaluate all our proposed approaches through cost analysis and simulations.
INDEX TERMS
Base stations, Algorithm design and analysis, Routing, Probabilistic logic, Probability, Equations, Optimization, algorithms and performance, Wireless sensor network, uncertain data, data aggregation, minimum queries
CITATION
Mao Ye, Ken C.K. Lee, Wang-Chien Lee, Xingjie Liu, Meng-Chang Chen, "Querying Uncertain Minimum in Wireless Sensor Networks", IEEE Transactions on Knowledge & Data Engineering, vol.24, no. 12, pp. 2274-2287, Dec. 2012, doi:10.1109/TKDE.2011.166
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