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This paper introduces two new tree-based anti-collision schemes using multiple feedback symbols for uplink tag random access of emerging Radio Frequency Identification (RFID) networks. To this end a uplink (UL) time slot requires an extra time portion called voting field in addition to the packet payload to obtain a slot based estimate for the number of contending tags. As a function of the voting field length the authors examine MAC efficiency improvements in terms of UL throughput, and compare it with the conventional binary tree based RFID MAC in ISO 18000-6 Type B standard.
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