Energy Efficient Data Acquistion in Wireless Sensor Network
Ken C.K., Mao Ye, Wang-Chien Lee · InTech eBooks · 2012
In-network data aggregationData aggregation is often used to summarize a large dataset.With respect to all sensed readings V from all sensor nodes N, an aggregate function f is applied on V to obtain a single aggregated value, i.e., f (V).Some commonly used aggregate functions include SUM, COUNT, MEAN, VARIANCE, MAX and MIN etc. Aggregated data can provide a very small summary of sensed readings (e.g., the highest, average and lowest temperature) in a sense area.In many situations, it can be sufficient for scientists to know about a remote sensed area.Besides, aggregated data is usually small to transmit and data aggregation is not very computationally expensive for sensor nodes to perform so that in-network data aggregation 199 Energy Efficient Data Acquistion in Wireless Sensor Network www.intechopen.com