Research Article Energy-Efficient Query Management Scheme for a Wireless Sensor Database System | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 978694 18 pages doi 2010 978694 Research Article Energy-Efficient Query Management Scheme for a Wireless Sensor Database System GuofangNan1 2 and Minqiang Li3 1 Institute of Systems Engineering Tianjin University Tianjin 300072 China 2 Department of Electronics Polytechnic University of Turin Turin 10129 Italy 3 Department of Information Management and Management Science Tianjin University Tianjin 300072 China Correspondence should be addressed to Guofang Nan guofangnan@ Received 5 November 2009 Revised 6 April 2010 Accepted 3 June 2010 Academic Editor Xinbing Wang Copyright 2010 G. Nan and M. Li. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Minimizing the communication overhead to reduce the energy consumption is an essential consideration in sensor network applications and existing research has mostly concentrated on data aggregation and in-network processing. However effective query management to optimize the query aggregation plan at the gateway side is also a significant approach to energy saving in practice. In this paper we present a multiquery management framework to support historical and continuous queries where the key idea is to reduce common tasks in a collection of queries through merging and aggregation according to query region attribute time duration and frequency by executing the common subqueries only once. In this framework we propose a query management scheme to support query partitioning region aggregation and approximate processing time partitioning and aggregation rules multirate queries and historical database. In order to validate the performance of our algorithm a heuristic routing protocol is also described. The performance simulation results show
