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The ubiquitous use of mobile phones motivates the idea of 'Participatory sensing' with a cell-phone based sensor network. In the authors' work, they consider a layered architecture for a query-based urban monitoring application using mobile phones. The key contribution of the paper is a Data-Aware Layered Waiting (DA-LW) time aggregation protocol in cell-phone based wireless sensor networks. To motivate the DA-LW protocol, they first develop a Cluster-Head (CH) based data aggregation protocol. The performance of the proposed protocols is evaluated in terms of energy, delay and resolution, which are primarily important for the monitoring application.
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