RFID-BASED DATA REDUCTION SYSTEM AND TECHNIQUES

• US 20100102935A1
• Filed: 10/29/2008
• Published: 04/29/2010
• Est. Priority Date: 10/29/2008
• Status: Active Grant

• Current Assignee: SAP SE
• Original Assignee: SAP AG (SAP SE)
• Inventors: Alpers, Sascha H., Zang, Martin P., Bruntsch, Andy, Chaves, Leonardo Weiss Ferreira
• Granted Patent: US 9,165,274 B2
• Time in Patent Office: Days
• US Class Current: 340/10.510
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06Q 10/08 Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Abstract

A method for tracking events using a radio frequency identification (RFID) tag may include reserving a bit window in a memory on a radio frequency identification (RFID) tag, the bit window having multiple bits, randomly marking one of the bits in the bit window each time a RFID event occurs, counting a number of marked bits in the bit window, and determining a number of the RFID events using the counted number of the marked bits and a size of the bit window.

Claims

1. A method for tracking events using a radio frequency identification (RFID) tag, the method comprising:

reserving a bit window in a memory on a radio frequency identification (RFID) tag, the bit window having multiple bits;

randomly marking one of the bits in the bit window each time a RFID event occurs;

counting a number of marked bits in the bit window; and

determining a number of the RFID events using the counted number of the marked bits and a size of the bit window.

2. The method as in claim 1 wherein randomly marking one of the bits in the bit window comprises receiving a write command at the RFID tag from a RFID interrogator without using a handshake between the RFID tag and the RFID interrogator.

3. The method as in claim 1 wherein randomly marking one of the bits in the bit window comprises broadcasting a write command to write a bit to the RFID tag without reading any data from the RFID tag prior to broadcasting the write command.

4. The method as in claim 1 wherein randomly marking one of the bits in the bit window occurs when the RFID tag crosses a writing area.

5. The method as in claim 1 further comprising reading the marked bits from the RFID tag.

6. The method as in claim 1 wherein:

reserving the bit window in the memory on the RFID tag comprises reserving multiple bit windows in the memory on the RFID tag, the multiple bit windows each representing a different event to be tracked; and

randomly marking one of the bits in the bit window comprises randomly marking one of the bits in one of the bit windows in response to an occurrence of a RFID event corresponding to the bit window.

7. A method for tracking events using a radio frequency identification (RFID) tag, the method comprising:

detecting a radio frequency identification (RFID) tag when the RFID tag crosses a writing area for a RFID interrogator, the RFID interrogator being associated with a unique writer identifier;

reading a last writer identifier from the RFID tag;

writing a data packet to the RFID tag when the last writer identifier does not match the unique writer identifier of the RFID interrogator that detected the RFID tag, the data packet comprising a timestamp and the unique writer identifier associated with the RFID interrogator that detected the RFID tag; and

storing the data packet on the RFID tag in a memory of the RFID tag, the memory being configured to store multiple data packets.

8. The method as in claim 7 further comprising reading the stored data packets from the RFID tag.

9. The method as in claim 8 further comprising aggregating the data packets related to a product.

10. The method as in claim 9 further comprising transferring the aggregated data packets to a central data repository.

11. The method as in claim 7 wherein writing the data packet comprises writing the data packet to the RFID tag using a block write command.

12. A system, comprising:

a radio frequency identification (RFID) tag that comprises an antenna and a memory, the memory comprising a bit window having multiple bits;

a RFID interrogator comprising an antenna and a radio frequency module, wherein the RFID interrogator is configured to communicate with the RFID tag and to randomly mark one of the bits in the bit window each time a RFID event occurs; and

a control module that is configured to count a number of marked bits in the bit window and to determine a number of the RFID events using the counted number of the marked bits and a size of the bit window.

13. The system of claim 12 wherein the control module is a component of the RFID interrogator.

14. The system of claim 12 wherein the RFID interrogator is configured to read the number of marked bits from the RFID tag and to communicate the number of marked bits to the control module, the control module being a component of a remote central repository.

15. The system of claim 12 wherein the RFID interrogator is configured to randomly mark one of the bits in the bit window by broadcasting a write command to write a bit to the RFID tag without reading any data from the RFID tag prior to broadcasting the write command.

16. The system of claim 12 wherein:

the memory in the RFID tag comprises multiple bit windows, the bit windows each representing a different event to be tracked; and

the RFID interrogator is configured to randomly mark one of the bits in one of the bit windows in response to an occurrence of a RFID event corresponding to the bit window.

17. The system of claim 12 wherein the RFID tag is configured to randomly select which one of the bits is to be marked.

18. The system of claim 12 wherein the RFID interrogator is configured to randomly select which one of the bits is to be marked.

19. A system, comprising:

a radio frequency identification (RFID) tag that comprises an antenna and a memory;

a RFID interrogator comprising an antenna, a radio frequency module and a unique writer identifier, wherein the RFID interrogator is configured to;

detect the RFID tag when the RFID tag crosses a writing area for the RFID interrogator,

read a last writer identifier from the RFID tag, and

write a data packet to the RFID tag when the last writer identifier does not match the unique writer identifier for the RFID interrogator that detected the RFID tag, the data packet comprising a timestamp and the unique writer identifier associated with the RFID interrogator that detected the RFID tag.

20. The system of claim 19 wherein:

the RFID tag is configured to store multiple data packets in the memory; and

the RFID interrogator is configured to read the stored data packets from the RFID tag.

21. The system of claim 20 wherein the RFID interrogator further comprises a control module that is configured to aggregate the data packets related to a product.

22. The system of claim 21 further comprising a central data repository, wherein the RFID interrogator is configured to transfer the aggregated data packets to the central data repository.

23. A radio frequency identification (RFID) tag, comprising:

an antenna that is configured to receive one or more commands;

a memory comprising a bit window, the bit window having multiple bits; and

a control module that is configured to control the antenna and the memory and that is configured to receive and to process a write command to randomly mark one of the bits in the bit window each time a RFID event occurs.

24. The RFID tag of claim 23 wherein the control module is configured to randomly select which one of the bits in the bit window is marked.

25. The RFID tag of claim 23 wherein the received write command includes which one of the bits in the bit window is marked.

26. The RFID tag of claim 23 wherein the control module is configured to receive and to process the write command without using a handshake with a RFID interrogator.