Inventory-cycle-based RFID tag location
AssigneeImpinj, Inc.
InventorsAlberto Pesavento, Thomas Anderl, Robert J. Ascani
Life of this patent
Estimating the term…
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.
Claims7
A method for a Radio Frequency Identification (RFID) system to estimate a location of an RFID tag, the method comprising:
- transmitting a first inventorying RF wave to a first zone;
- counting a first nonzero number of responses from the RFID tag in the first zone;
- determining a first success rate based on the first nonzero response count and a first opportunity metric associated with the first zone;
- transmitting a second inventorying RF wave to a second zone different from but overlapping the first zone;
- counting a second nonzero number of responses from the RFID tag in the second zone;
- determining a second success rate based on the second nonzero response count and a second opportunity metric associated with the second zone;
- and
- estimating the tag location within an overlapping portion of the first and second zones based at least on a comparison of the first and second success rates.
Dependencies are inferred from the claim text.