An energy-efficient data collection framework for wireless sensor networks by exploiting spatiotemporal correlation

被引:164
|
作者
Liu, Chong [1 ]
Wu, Kui
Pei, Jian
机构
[1] Univ Victoria, Dept Comp Sci, Victoria, BC V8W 3P6, Canada
[2] Simon Fraser Univ, Dept Comp Sci, Burnaby, BC V5A 1S6, Canada
基金
加拿大自然科学与工程研究理事会; 加拿大创新基金会;
关键词
energy efficiency; data collection; spatiotemporal correlation; wireless sensor networks;
D O I
10.1109/TPDS.2007.1046
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
Limited energy supply is one of the major constraints in wireless sensor networks. A feasible strategy is to aggressively reduce the spatial sampling rate of sensors, that is, the density of the measure points in a field. By properly scheduling, we want to retain the high fidelity of data collection. In this paper, we propose a data collection method that is based on a careful analysis of the surveillance data reported by the sensors. By exploring the spatial correlation of sensing data, we dynamically partition the sensor nodes into clusters so that the sensors in the same cluster have similar surveillance time series. They can share the workload of data collection in the future since their future readings may likely be similar. Furthermore, during a short-time period, a sensor may report similar readings. Such a correlation in the data reported from the same sensor is called temporal correlation, which can be explored to further save energy. We develop a generic framework to address several important technical challenges, including how to partition the sensors into clusters, how to dynamically maintain the clusters in response to environmental changes, how to schedule the sensors in a cluster, how to explore temporal correlation, and how to restore the data in the sink with high fidelity. We conduct an extensive empirical study to test our method using both a real test bed system and a large-scale synthetic data set.
引用
收藏
页码:1010 / 1023
页数:14
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