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In spite of the remarkable efforts the community put to build the sensor systems, an essential question still remains unclear at the system level, motivating one to explore the answer from a point of real-world deployment view. Does the wireless sensor network really scale? The authors present findings from a large scale operating sensor network system, GreenOrbs, with up to 330 nodes deployed in the forest. They instrument such an operating network throughout the protocol stack and present observations across layers in the network. Based on the findings from the system measurement, they propose and make initial efforts to validate three conjectures that give potential guidelines for future designs of large scale sensor networks.
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