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Efficient and fast distributed top-k query protocol in wireless sensor networks

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3 Author(s)
Shao-Jie Tang ; Dept. of Comput. Sci., Illinois Inst. of Technol., Chicago, IL, USA ; Xufei Mao ; Xiang-Yang Li

In this paper, we focus on designing efficient query of top-k data produced by sensor nodes in a wireless sensor network (WSN). Assume that we are given a connected WSN of diameter D, consisting of n nodes with maximum node degree Δ. Two different models are studied. In the first model, each node holds a numeric element, the goal is to determine the top-k smallest (or biggest) of these elements from all nodes. In the second model, there are m objects in set ℒ, each node vi, 1 ≤ i ≤ n holds a numeric value Sj(vi) for each object Lj ∈ ℒ,1 ≤ j ≤ m, the goal is to find the k objects in ℒ with the k smallest (or biggest) aggregated values /(sj(u1), Sj(v2), ..., Sj(vn)), where f is an aggregation function given in advance. We propose both fast and message efficient methods for conducting top-k queries in the two aforementioned models. Following that we study the minimum delay and messages required by any distributed method for top-k queries in both models. Our analysis shows that our methods are almost optimum. We conducted extensive experiments in both testbed and simulations to study the practical performances of our methods.

Published in:

Network Protocols (ICNP), 2011 19th IEEE International Conference on

Date of Conference:

17-20 Oct. 2011