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Energy consumption of portable RFID readers is becoming an important issue as applications of RFID systems pervade many aspects of the people lives. Surprisingly, however, these systems are not energy-aware with the focus till date being on reducing the time to read all tags by the reader. In this paper, the authors consider the problem of tag arbitration in RFID systems with the aim of designing energy aware anti-collision protocols. They explore the effectiveness of using multiple time slots per node of a binary search tree through three anti-collision protocols. They further develop an analytical framework to predict the performance of the protocols and enable protocol parameter selection.
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