Inventory-cycle-based RFID tag location
First Claim
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1. A method for a Radio Frequency Identification (RFID) synthesized-beam reader (SBR) system to estimate a location of an RFID tag, the method comprising:
- transmitting a first inventorying RF wave in a first SBR beam;
receiving a first nonzero number of responses from the RFID tag in the first SBR beam;
determining a first success rate based on a first response count and a first opportunity metric associated with the first SBR beam;
transmitting a second inventorying RF wave in a second SBR beam different from but overlapping the first SBR beam;
receiving a second nonzero number of responses from the RFID tag in the second SBR beam;
determining a second success rate based on a second response count and a second opportunity metric associated with the second SBR beam; and
estimating the tag location within an overlapping portion of the first and second SBR beams based at least on a comparison between the first success rate and the second success rate.
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Abstract
Techniques are provided to estimate the location of an RFID tag using tag read information, such as a tag read count or a tag read rate, and an opportunity metric, such as an inventory cycle duration, inventory cycle rate, or inventory cycle count. A tag tracking system determines read information for a tag in a zone and an opportunity metric associated with the tag and the zone. The tag tracking system then computes a success rate based on the tag read information and opportunity metric, and uses the success rate to estimate the location of the tag.
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Citations
20 Claims
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1. A method for a Radio Frequency Identification (RFID) synthesized-beam reader (SBR) system to estimate a location of an RFID tag, the method comprising:
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transmitting a first inventorying RF wave in a first SBR beam; receiving a first nonzero number of responses from the RFID tag in the first SBR beam; determining a first success rate based on a first response count and a first opportunity metric associated with the first SBR beam; transmitting a second inventorying RF wave in a second SBR beam different from but overlapping the first SBR beam; receiving a second nonzero number of responses from the RFID tag in the second SBR beam; determining a second success rate based on a second response count and a second opportunity metric associated with the second SBR beam; and estimating the tag location within an overlapping portion of the first and second SBR beams based at least on a comparison between the first success rate and the second success rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Radio Frequency Identification (RFID) system configured to estimate a location of an RFID tag, the system comprising:
a synthesized-beam reader (SBR) configured to; generate at least first and second beams, wherein the first and second beams are different but overlap; and transmit inventorying RF waves in the first and second beams; and
a processor block coupled to the SBR and configured to;cause the SBR to transmit a first inventorying RF wave in the first beam; receive a first nonzero number of responses from the RFID tag in the first beam; determine a first success rate based on a first response count and a first opportunity metric associated with the first beam; cause the SBR to transmit a second inventorying RF wave in the second beam; receive a second nonzero number of responses from the RFID tag in the second beam; determine a second success rate based on a second response count and a second opportunity metric associated with the second beam; and estimate the tag location within an overlapping portion of the first and second beams based on at least a comparison between the first success rate and the second success rate. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for a Radio Frequency Identification (RFID) synthesized-beam reader (SBR) system to estimate a location of an RFID tag, the method comprising:
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counting a first nonzero number of responses from the tag in a first SBR beam directed to a first zone; determining a first success rate based on the first response count and a first opportunity metric associated with the first SBR beam; counting a second nonzero number of responses from the tag in a second SBR beam different from the first SBR beam and directed to a second zone; determining a second success rate based on the second response count and a second opportunity metric associated with the second SBR beam; and estimating the tag location with respect to at least one of the first and second zones based on at least a comparison between the first and second success rates. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification