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The widespread acceptance of RFID tags in inventory control applications has allowed the development of increasingly complex and useful inventory management techniques. This paper approaches the problem of real-time inventory querying in a large warehouse. The authors use a combination of powered, wireless capable active RFID tags and a mobile RFID reader to design a querying system that uses both a mesh network formed with the active RFID tags and the mobile reader to balance query latency and total network lifetime. They implemented and simulated their system on Crossbow MicaZ motes and a custom robot platform.
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