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Identifying RFID categories

  • US 9,081,996 B2
  • Filed: 05/21/2009
  • Issued: 07/14/2015
  • Est. Priority Date: 05/21/2009
  • Status: Active Grant
First Claim
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1. A tag for an RFID system, the tag comprising:

  • a memory adapted to store a tag identification (ID) value for the tag, the tag ID value comprising (i) a category ID value shared with at least one other tag and selected from one of a plurality of predetermined values corresponding to different categories of RFID tags and (ii) an instance value;

    an antenna adapted to receive a downlink signal from a reader and transmit an uplink signal to the reader; and

    a processor adapted to process the downlink signal and generate the uplink signal, wherein;

    the processor is adapted to select at least one slot in a multi-slot frame based on the stored category ID value, but independent of the stored instance value; and

    the tag is adapted to transmit the uplink signal in the at least one selected slot in the multi-slot frame.

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