The Journal focuses on Communication, Power consumption, Computation, Uncertainty in sensor readings. The wireless network connecting the sensor nodes provides usually only a very limited quality of service has latency with high variance, limited bandwidth, and frequently drops packets. Sensor nodes have limited supply of energy, and thus energy conservation needs to be of the main system design considerations of any sensor network application. For example, the MICA motes are powered by two AA batteries, that provide about 2000mAh [13], powering the mote for approximately one year in the idle state and for one week under full load. Sensor nodes have limited computing power and memory sizes. This restricts the types of data processing algorithms on a sensor node, and it restricts the sizes of intermediate results that can be stored on the sensor nodes. Signals detected at physical sensors have inherent uncertainty, and they may contain noise from the environment. Sensor malfunction might generate inaccurate data, and unfortunate sensor placement (such as a temperature sensor directly next to the air conditioner) might bias individual readings. Hardware for sensor nodes that combine physical sensors, actuators, embedded processors, and communication components has advanced significantly over the last decade, and made the large-scale deployment of such sensors a reality. Applications range from monitoring applications such as inventory maintenance over health care to military applications. In this paper, we evaluate the design of a query layer for sensor networks. The query layer accepts queries in a declarative language that are then optimized to generate efficient query execution plans with in-network processing which can significantly reduce resource requirements. We examine the main architectural components of such a query layer, concentrating on in-network aggregation, interaction of in-network aggregation with the wireless routing protocol, and distributed query processing. Initial simulation experiments with the ns-2 network simulator show the tradeoffs of our system.

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Journal of Industrial Electronics and Applications
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