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1. DISTRIBUTED PROCESSING OF PROBABILISTIC TOP-K QUERIES IN
WIRELESS SENSOR NETWORKS
ABSTRACT:
In this paper, we introduce the notion of sufficient set and necessary set for distributed
processing of probabilistic top-k queries in cluster-based wireless sensor networks. These two
concepts have very nice properties that can facilitate localized data pruning in clusters.
We develop a suite of algorithms, namely, sufficient set-based (SSB), necessary set-based
(NSB), and boundary-based (BB), for intercluster query processing with bounded rounds of
communications in responding to dynamic changes of data distribution in the network.
We develop an adaptive algorithm that dynamically switches among the three proposed
algorithms to minimize the transmission cost. We show the applicability of sufficient set and
necessary set to wireless sensor networks with both two-tier hierarchical and tree-structured
network topologies.
Experimental results show that the proposed algorithms reduce data transmissions significantly
and incur only small constant rounds of data communications. The experimental results also
demonstrate the superiority of the adaptive algorithm, which achieves a near-optimal
performance under various conditions.
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