A Continuous Query Allocation Scheme with Time-Parameters in Wireless Sensor Networks with Multiple Sinks

Myungho YEO  Junho PARK  Haksin KIM  Jaesoo YOO  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.4   pp.1431-1434
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1431
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
wireless sensor networks,  continuous query,  time-duration,  time-interval,  multiple sinks,  

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In this paper, we propose a novel scheme to optimize the allocation of continuous queries in a sensor network with multiple sinks. The existing scheme compares the coverage areas of given queries and estimates the amount of sharing among them. It tries to allocate queries to the optimal sink that maximizes the amount of sharing and reduces the communication costs among sensor nodes and sinks. However, it inefficiently allocates continuous queries. The amount of sharing among continuous queries depends not only on their coverage area but also on their time-parameters like time-duration and time-interval. We define a new cost estimator with time-parameters for continuous queries and optimize their allocation in the sensor network. Simulation results show that our scheme performs the allocation of continuous queries efficiently and reduces the communication cost.