Apparatus and method for avoiding cross-reading of RFID using visible light recognition

• US 10,496,857 B2
• Filed: 07/12/2018
• Issued: 12/03/2019
• Est. Priority Date: 11/13/2017
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute, IDRO Company Limited
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Shin, Dong Beom, Kang, Yang Gi, Oh, Kwang Jin, Lee, Sang Mok, Kim, Hyun Seok, Mo, Sang Hyun, Lee, Kang Bok
• Primary Examiner(s): Blouin, Mark S
• Application Number:
  US16/033,595
• Publication Number:
  US 20190147201A1
• Time in Patent Office: 509 Days
• Field of Search: 340 102
• CPC Class Codes: G06K 19/145 at least one of the further markings being adapted for galvanic or wireless sensing, e.g. an RFID tag with both a wireless and an optical interface or memory, or a contact type smart card with ISO 7816 contacts and an optical interface or memory
• CPC Class Codes: G06K 7/10108 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 Class Codes: G06K 7/10158 methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
• CPC Class Codes: H04B 10/116 Visible light communication

Abstract

A radio frequency identification (RFID) technology which overcomes a cross-reading problem by using visible light recognition and identification values. An RFID reader terminal includes a visible light transmitter configured to transmit a visible light signal including an identification value of the RFID reader terminal, a radio frequency (RF) receiver configured to receive an RF signal including an identification value of an RFID tag terminal and information of the RFID tag terminal from the RFID tag terminal, and a reader controller configured to determine whether the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal. In addition, there is provided an RFID tag terminal corresponding to the RFID reader terminal.

Claims

1. A radio frequency identification (RFID) reader terminal comprising:

a visible light transmitter configured to transmit a visible light signal including an identification value of the RFID reader terminal;

a radio frequency (RF) receiver configured to receive an RF signal including an identification value of an RFID tag terminal and information of the RFID tag terminal from the RFID tag terminal; and

a reader controller configured to determine whether the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal,

wherein the reader controller recognizes the information of the RFID tag terminal when the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal.

2. The RFID reader terminal of claim 1, further comprising a power transmitter configured to transmit power to the RFID tag terminal using a continuous wave (CW).

3. The RFID reader terminal of claim 1, wherein pulse interval encoding (PIE) has been performed on the visible light signal.

4. The RFID reader terminal of claim 1, wherein the RF signal includes the identification value of the RFID tag terminal and the information of the RFID tag terminal through a backscattering method.

5. The RFID reader terminal of claim 1, wherein frequency modulation zero (FM0) coding or miller coding has been performed on the RF signal.

6. The RFID reader terminal of claim 1, wherein the identification value of the RFID reader terminal is an arbitrary 16-bit value.

7. A radio frequency identification (RFID) tag terminal comprising:

a visible light receiver configured to receive a visible light signal including an identification value of an RFID reader terminal from the RFID reader terminal;

a tag controller configured to store information of an article, which the RFID tag terminal is attached to, as information of the RFID tag terminal and to determine the identification value of the RFID reader terminal as an identification value of the RFID tag terminal; and

a radio frequency (RF) transmitter configured to transmit an RF signal including the identification value of the RFID tag terminal and the information of the RFID tag terminal to the RFID reader terminal,

wherein the information of the RFID tag terminal is recognized by the RFID reader terminal when the identification value of the RFID reader terminal is identical to an identification value of the RFID tag terminal.

8. The RFID tag terminal of claim 7, further comprising a power receiver configured to receive power from the RFID reader terminal through a continuous wave (CW).

9. The RFID tag terminal of claim 7, wherein pulse interval encoding (PIE) has been performed on the visible light signal.

10. The RFID tag terminal of claim 7, wherein the RF signal includes the identification value of the RFID tag terminal and the information of the RFID tag terminal through a backscattering method.

11. The RFID tag terminal of claim 7, wherein frequency modulation zero (FM0) coding or miller coding has been performed on the RF signal.

12. The RFID tag terminal of claim 7, wherein the identification value of the RFID reader terminal is an arbitrary 16-bit value.

13. A method of recognizing tag information, which is performed by a radio frequency identification (RFID) reader terminal, the method comprising:

transmitting a visible light signal including an identification value of the RFID reader terminal;

receiving a radio frequency (RF) signal including an identification value of an RFID tag terminal and information of the RFID tag terminal from the RFID tag terminal; and

determining whether the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal,

wherein the determining of whether the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal comprises recognizing the information of the RFID tag terminal when the identification value of the RFID reader terminal is identical to the identification value of the RFID tag terminal.

14. The method of claim 13, further comprising transmitting power to the RFID tag terminal through a continuous wave (CW).

15. The method of claim 13, wherein pulse interval encoding (PIE) has been performed on the visible light signal.

16. The method of claim 13, wherein the RF signal includes the identification value of the RFID tag terminal and the information of the RFID tag terminal through a backscattering method.

17. The method of claim 13, wherein frequency modulation zero (FM0) coding or miller coding has been performed on the RF signal.

18. The method of claim 13, wherein the identification value of the RFID reader terminal is an arbitrary 16-bit value.