1. Exact Top-K Queries in Wireless Sensor Networks.
- Author
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Malhotra, Baljeet, Nascimento, Mario A., and Nikolaidis, Ioanis
- Subjects
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WIRELESS communications , *SENSOR networks , *QUERYING (Computer science) , *ALGORITHMS , *ELECTRIC network topology , *ENERGY consumption , *ELECTRONIC data processing , *SIMULATION methods & models - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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