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This chapter presents schemes for detecting all missing tags in COTS RFID systems. We first introduce a point-to-multipoint protocol, named P2M, which operates within an analog frame-slotted Aloha paradigm to interrogate tags and collect their electronic product codes (EPCs). A tag is identified as missing tag if its EPC is absent from the collected data. To mitigate the time cost associated with tag response collision in P2M, we further present a collision-free point-to-point protocol, named P2P, which selectively specifies a tag to respond with its EPC in each slot. If the EPC is not received, the tag is considered missing.

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Practical Hashing-Free Access Implementation with COTS RFID Systems

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  • 发表日期：

    2026年

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  • Rongrong Zhang,
  • Hao Liu

摘要

This chapter presents schemes for detecting all missing tags in COTS RFID systems. We first introduce a point-to-multipoint protocol, named P2M, which operates within an analog frame-slotted Aloha paradigm to interrogate tags and collect their electronic product codes (EPCs). A tag is identified as missing tag if its EPC is absent from the collected data. To mitigate the time cost associated with tag response collision in P2M, we further present a collision-free point-to-point protocol, named P2P, which selectively specifies a tag to respond with its EPC in each slot. If the EPC is not received, the tag is considered missing.