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Wireless Sensor Networks (WSNs) have been widely deployed for environmental monitoring and urban sensing applications. With the advancement of mobile phones, mobile users have increasing demands for sensing data relevant to their locations and activities. It is crucial to support reliable ubiquitous sensing for mobile users to retrieve sensing data of their interests anytime and anywhere. In this paper, the authors propose a novel location-based publish/subscribe framework for mobile users to subscribe for sensing data by simply specifying the event types and target locations of their interests. The framework is developed on a location-based Distributed Hash Table (DHT) overlay formed by a network of brokers.
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