Energy-efficient top-k query evaluation and maintenance in wireless sensor networks
Top-k query in a wireless sensor network is to identify k sensors with the highest sensor readings. Since sensors usually are powered by energy-limited batteries, a fundamental problem associated with top-k query evaluation in such a network is to maximize network lifetime, which poses great challenges due to the unique characteristics of sensor networks. In this paper, we first propose a novel filter-based algorithm for top-k query evaluation, which is able to filter out a fractional amount of...[Show more]
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