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Exact Top-K Queries in Wireless Sensor Networks

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3 Author(s)
Malhotra, B. ; Centre for Maritime Studies, Nat. Univ. of Singapore, Singapore, Singapore ; Nascimento, M.A. ; Nikolaidis, I.

In this paper, we consider the exact top-k query problem in wireless sensor networks, i.e., where one seeks to find the k highest reported values as well as the complete set of nodes that reported them. Our primary contribution in this context is EXTOK, a provably correct and topology-independent new filtering-based algorithm for processing exact top-k queries. As a secondary contribution we confirm a previous result of ours by showing that the efficiency of top-k query processing algorithms, including EXTOK, can be further improved by simply choosing a proper underlying logical tree topology. We examine EXTOK's performance with respect to a number of parameters and different logical tree topologies while using both synthetic and real data sets. Our simulation reveal that EXTOK consistently outperforms the current state-of-the-art algorithm by a very significant margin and regardless of the underlying logical tree topology.

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Knowledge and Data Engineering, IEEE Transactions on  (Volume:23 ,  Issue: 10 )