RFID error detection systems and methods

Patent metadata

Field	Value
Publication number	US-10467443-B2
Application number	US-201916397889-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	May 19, 2017
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

In some embodiments, systems and methods are provided herein to improve RFID tag reading. Some embodiments provide retail RFID tag exclusion systems that comprise: a set of RFID tag readers; and an RFID evaluation control circuit configured to: access a set of current tag read criteria associated with an RFID tag; access multiple sets of previous tag read criteria; access and apply a set of tag evaluation rules and identify when a threshold number of the set of current tag read criteria are each within corresponding criteria thresholds of a corresponding previous tag read criterion of a previous set of tag read criteria; and exclude the RFID tag when the threshold number of the current tag read criteria are within the corresponding criteria thresholds of the corresponding previous tag read criterion of the set of previous tag read criteria.

First claim

What is claimed is:

1. A retail RFID tag exclusion system, comprising:
a set of at least one RFID tag readers positioned proximate a limited area and configured to detect RFID tags within the limited area; and
an RFID evaluation control circuit configured to:
access a current first set of one or more current tag read criteria associated with a current reading of a first RFID tag by at least one of the set of at least one RFID tag readers;
access multiple sets of previous tag read criteria previously detected by one or more of the set of at least one RFID tag readers;
access a set of at least one tag evaluation rules to evaluate detected RFID tags;
apply one or more tag evaluation rules of the set of at least one tag evaluation rules and identify when a threshold number of the first set of one or more current tag read criteria are each within a corresponding criteria threshold of a corresponding previous tag read criterion of a second set of one or more previous tag read criteria; and
exclude the first RFID tag when the threshold number of the first set of one or more current tag read criteria are within the corresponding criteria threshold of the corresponding previous tag read criterion of the second set of one or more previous tag read criteria.

2. The system of claim 1 , wherein the RFID evaluation control circuit is configured to:
identify a first set of items associated with a first person;
cause a listing of items comprising the first set of items to be presented to the first person;
receive a notification specified by the first person that a first item should not be included in the listing; and
cause a corresponding third set of tag read criteria associated with the first item to be added to an RFID criteria database that receives and stores sets of previously detected RFID tag read criteria, wherein each set of the previously detected RFID tag read criteria corresponds to a single RFID tag, including the second set of one or more previous tag read criteria.

3. The system of claim 2 , wherein the RFID evaluation control circuit in causing the listing of items to be presented to the first person is configured to cause a point-of-sale system to render the listing through a graphical user interface displayed on a display associated with the point-of-sale system.

4. The system of claim 2 , wherein the RFID evaluation control circuit is configured to identify when the first item is identified by a threshold number of persons as not to be included in the respective listings associated with the persons, and cause an audit notification to be generated directing an audit of a first product corresponding to the first item.

5. The system of claim 1 , wherein the RFID evaluation control circuit is configured to:
identify when a threshold number of a third set of previous tag read criteria have each been within corresponding criteria thresholds of a threshold number of other sets of tag read criteria; and
designate the third set of previous tag read criteria as an erroneous set of tag reads to be used to exclude subsequent sets of tag read criteria that have the threshold number of tag read criteria that each are within the corresponding criteria thresholds of the third set of previous tag reads.

6. The system of claim 1 , wherein the RFID evaluation control circuit is configured to:
identify a first set of items associated with a first customer based on an RFID tag read for each of the items of the first set of items, including the first RFID tag, and intended to be purchased by the first customer;
wherein the RFID evaluation control circuit in excluding the first RFID tag is configured to autonomously cause the first item to be excluded by a point-of-sale system from a purchase set of items to be purchased by the first customer.

7. The system of claim 1 , wherein the RFID evaluation control circuit is configured to:
identify, based on an audit performed at a retail shopping facility of items of a product associated with the first RFID tag, that a first item exclusively associated with a third set of previous tag read criteria is no longer present at the shopping facility; and
cause the third set of previous tag read criteria associated with the first item to be removed from an RFID criteria database storing sets of previously detected RFID tag read criteria.

8. The system of claim 1 , wherein the RFID evaluation control circuit is configured to:
identify that a threshold period of time has passed since a third set of previous tag read criteria was detected relative to the limited area; and
cause the third set of previous tag read criteria to be removed from an RFID criteria database storing sets of previously detected RFID tag read criteria.

9. The system of claim 1 , wherein the RFID evaluation control circuit in excluding the first RFID tag is configured to cause a first product corresponding to the first RFID tag to be excluded from a listing of products associated with a customer.

10. The system of claim 1 , wherein the first set of one or more current tag read criteria comprises one or more of signal strength indicator (RSSI), angle of signal arrival, phase of modulation, read rate, identification of an antenna detecting a single from the first RFID tag, and an identifier within data received from the first RFID tag.

11. A method of excluding erroneous retail RFID tags, comprising:
accessing a first set of one or more current tag read criteria associated with a current reading of a first RFID tag by a set of at least one RFID tag reader;
accessing multiple sets of previous tag read criteria previously detected by one or more of the set of at least one RFID tag readers;
accessing a set of at least one tag evaluation rules to evaluate detected RFID tags;
applying one or more tag evaluation rules of the set of tag evaluation rules and identifying when a threshold number of the first set of one or more current tag read criteria are each within a corresponding criteria threshold of a corresponding previous tag read criterion of a second set of one or more previous tag read criteria; and
excluding the first RFID tag when the threshold number of the first set of one or more current tag read criteria are within the corresponding criteria thresholds of the corresponding previous tag read criterion of the second set of one or more previous tag read criteria.

12. The method of claim 11 , further comprising:
identifying a first set of items associated with a first person;
causing a listing of items comprising the first set of items to be presented to the first person;
receiving a notification specified by the first person that a first item should not be included in the listing; and
causing a corresponding third set of tag read criteria associated with the first item to be added to an RFID criteria database that receives and stores sets of previously detected RFID tag read criteria, wherein each set of the previously detected RFID tag read criteria corresponds to a single RFID tag, including the second set of one or more previous tag read criteria.

13. The method of claim 12 , wherein the causing the listing of items to be presented to the first person comprises causing a point-of-sale system to render the listing through a graphical user interface displayed on a display associated with the point-of-sale system.

14. The method of claim 12 , further comprising:
identifying when the first item is identified by a threshold number of persons as not to be included in the respective listings associated with the persons; and
causing an audit notification to be generated directing an audit of a first product correspondin

Assignees

• Walmart Apollo Llc

Inventors

• Jones Nicholaus A
• Jones Matthew A
• Vasgaard Aaron J

Classifications

• G06K7/10108

  interrogating only those RFIDs that fulfill a predetermined requirement, e.g. selecting all RFIDs having the same speed and moving in a cloud like fashion, e.g. on the same train; interrogating only RFIDs having a certain predetermined temperature, e.g. in the same fridge, another possibility being the active ignoring of a group of tags that fulfill a predetermined requirement, equivalent to the Boolean NOT operation · CPC title

• G07G1/009

  the reader being an RFID reader · CPC title

• G06Q20/208

  Input by product or record sensing, e.g. weighing or scanner processing · CPC title

• G06K7/10356 Primary

  using a plurality of antennas, e.g. configurations including means to resolve interference between the plurality of antennas · CPC title