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Journal of Information Science and Engineering, Vol. 23 No. 4, pp. 1103-1121 (July 2007)

Data Aggregation of Range Querying for Grid-based Sensor Networks*

Tzung-Shi Chen+, Yi-Shiang Chang+, Hua-Wen Tsai and Chih-Ping Chu
+Department of Information and Learning Technology
National University of Tainan
Tainan, 700 Taiwan
E-mail: chents@mail.nutn.edu.tw
Department of Computer Science and Information Engineering
National Cheng Kung University
Tainan, 701 Taiwan
E-mail: chucp@csie.ncku.edu.tw

This work proposes efficient data aggregation algorithms for range query in wireless sensor networks. The proposed aggregation and query mechanisms are based on a virtual grid in sensor networks. A sensor node is selected to be a manager, named head, in each grid. The head node detects the generated event, announces event to all heads, and responds the query of mobile users. A user obtains the occurred event information from its grid head. If a user is interested in the event, it issues a query to acquire data of a specified regular-shape or spreading irregular-shape ranges. User can designate a regular range for querying. To track the diffusing event, this work proposes an efficient distributed algorithm for a dynamic tree structure in sensor networks. Users can oversee the spreading event via querying the incurred irregular-shape range. Additionally, this work proposes efficient approaches to gather data from sensor networks when voids exist. Finally, experimental results show that the proposed approaches are more energy-efficiency than the existing approach.

Keywords: data aggregation, grid, tracking, routing, wireless sensor networks

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Received September 15, 2006; accepted February 6, 2007.
Communicated by Ten H. Lai, Chung-Ta King and Jehn-Ruey Jiang.
*This work was supported in part by the National Science Council of Taiwan, R.O.C., under grants No. NSC- 95- 2221-E-024-012 and NSC-95-2524-S-156-001.