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Many tasks require multiple sensing capabilities; in Wireless Sensor Networks (WSNs), it is expensive to deploy a homogeneous network wherein every sensor has the same functionality. Instead, it is economical to deploy a heterogeneous network wherein sensors differ in their capabilities; in such a network, efficient data querying is essential. The authors propose a multi-keyword routing protocol, iBubble, for Heterogeneous Wireless Sensor Networks (HWSNs) where keywords describe sensor functionalities. iBubble provides an efficient query interface for locating data; queries are routed only along paths with nodes matching the query.
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