RADIO FREQUENCY IDENTIFICATION (RFID) READER WITH FREQUENCY ADJUSTMENT OF CONTINUOUS RADIO FREQUENCY (RF) WAVE

• US 20170017874A1
• Filed: 05/06/2016
• Published: 01/19/2017
• Est. Priority Date: 05/06/2016
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: PARK, Edwin Chongwoo
• Application Number:
  US15/148,023
• Publication Number:
  US 20170017874A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 101/00 Lubricating compositions characterised by the base-material being a mineral or fatty oil containing more than 10% water C10M173/00
• CPC Class Codes: C10M 129/02 having a carbon chain of less than 30 atoms
• CPC Class Codes: C10M 135/10 Sulfonic acids or derivatives thereof
• CPC Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 2203/1006 used as base material
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2205/0285 used as base material
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10N 2010/02 Groups 1 or 11
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2010/12 Groups 6 or 16
• CPC Class Codes: C10N 2030/00 Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
• CPC Class Codes: C10N 2030/10 Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2040/255 : Gasoline engines
• CPC Class Codes: G06K 19/0724 : the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types
• CPC Class Codes: G06K 19/07796 : arrangements on the record carrier to allow stacking of a plurality of similar record carriers, e.g. to avoid interference between the non-contact communication of the plurality of record carriers
• CPC Class Codes: G06K 7/10009 : sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
• CPC Class Codes: G06K 7/10217 : parameter settings controlling the transmission power of the interrogator
• CPC Class Codes: G06K 7/10297 : arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092 cryptographic protocols H04L9/00; network security protocols H04L63/00; real-time communication protocols in data switching networks H04L65/00; network protocols for data switching network services H04L67/00

Abstract

A method of communicating by a Radio Frequency Identification (RFID) reader includes transmitting, by the RFID reader, a continuous radio frequency (RF) wave at a first frequency. The method also includes adjusting, by the RFID reader, the first frequency of the continuous RF wave to a second frequency and then receiving a backscattered RF wave at the first frequency from an RFID tag. The backscattered RF wave is generated by the RFID tag in response to the continuous RF wave of the first frequency. A difference between the first frequency and the second frequency is equal to or greater than a frequency difference threshold to reduce interference between the backscattered RF wave and the continuous RF wave.

Claims

1. A method of communicating by a Radio Frequency Identification (RFID) reader, the method comprising:

transmitting, by the RFID reader, a continuous radio frequency (RF) wave at a first frequency;

adjusting, by the RFID reader, the first frequency of the continuous RF wave to a second frequency; and

then

receiving a backscattered RF wave at the first frequency from an RFID tag, the backscattered RF wave generated by the RFID tag in response to the continuous RF wave of the first frequency, wherein a difference between the first frequency and the second frequency is equal to or greater than a frequency difference threshold to reduce interference between the backscattered RF wave and the continuous RF wave.

2. The method of claim 1, wherein receiving the backscattered RF wave at the first frequency comprises filtering the backscattered RF wave to remove the continuous RF wave of the second frequency.

3. The method of claim 1, wherein the transmitting, the adjusting, and the receiving occur during a single transaction between the RFID reader and the RFID tag.

4. The method of claim 3, further comprising:

transmitting a message, by the RFID reader, of the single transaction between the RFID reader and the RFID tag, utilizing the continuous RF wave of the first frequency; and

receiving a response to the message of the single transaction on the backscattered RF wave of the first frequency after adjusting the first frequency of the continuous RF wave to the second frequency.

5. The method of claim 3, further comprising continuously adjusting the first frequency of the continuous RF wave during the single transaction between the RFID reader and the RFID tag.

6. The method of claim 5, wherein continuously adjusting the first frequency comprises continuously adjusting the first frequency of the continuous RF wave based on a sawtooth cycle.

7. The method of claim 3, further comprising adjusting the first frequency of the continuous RF wave in a step-wise manner during the single transaction between the RFID reader and the RFID tag.

8. The method of claim 3, wherein adjusting the first frequency of the continuous RF wave comprises randomly selecting a next frequency of the continuous RF wave during the single transaction between the RFID reader and the RFID tag.

9. The method of claim 3, wherein adjusting the first frequency of the continuous RF wave comprises frequency-hopping the first frequency of the continuous RF wave during the single transaction between the RFID reader and the RFID tag.

10. The method of claim 1, further comprising:

determining a transmit power of the continuous RF wave, wherein the adjusting of the first frequency of the continuous RF wave is in response to the transmit power.

11. The method of claim 10, further comprising:

adjusting the first frequency of the continuous RF wave to the second frequency in response to the transmit power being greater than or equal to a power threshold; and

maintaining the continuous RF wave at the first frequency in response to the transmit power being less than the power threshold such that the continuous RF wave is at the first frequency when the backscattered RF wave of the first frequency is received.

12. A Radio Frequency Identification (RFID) reader, comprising:

a transceiver configured to;

transmit a continuous radio frequency (RF) wave at a first frequency;

adjust the first frequency of the continuous RF wave to a second frequency; and

then

receive a backscattered RF wave at the first frequency from an RFID tag, the backscattered RF wave generated by the RFID tag in response to the continuous RF wave of the first frequency, wherein a difference between the first frequency and the second frequency is equal to or greater than a frequency difference threshold to reduce interference between the backscattered RF wave and the continuous RF wave.

13. The RFID reader of claim 12, wherein the transceiver is further configured to filter the backscattered RF wave to remove the continuous RF wave of the second frequency.

14. The RFID reader of claim 12, wherein the transceiver is further configured to:

transmit a message of a single transaction between the RFID reader and the RFID tag, utilizing the continuous RF wave of the first frequency; and

receive a response to the message of the single transaction on the backscattered RF wave of the first frequency after adjusting the first frequency of the continuous RF wave to the second frequency.

15. The RFID reader of claim 12, wherein the transceiver is further configured to continuously adjust the first frequency of the continuous RF wave during a single transaction between the RFID reader and the RFID tag.

16. The RFID reader of claim 15, wherein the transceiver is further configured to continuously adjust the first frequency of the continuous RF wave based on a sawtooth cycle during the single transaction between the RFID reader and the RFID tag.

17. The RFID reader of claim 12, wherein the transceiver is further configured to adjust the first frequency of the continuous RF wave in a step-wise manner during a single transaction between the RFID reader and the RFID tag.

18. The RFID reader of claim 12, wherein the transceiver is further configured to adjust the first frequency of the continuous RF wave by randomly selecting a next frequency of the continuous RF wave during a single transaction between the RFID reader and the RFID tag.

19. The RFID reader of claim 12, wherein the transceiver is further configured to adjust the first frequency of the continuous RF wave by frequency-hopping the first frequency of the continuous RF wave during a single transaction between the RFID reader and the RFID tag.

20. The RFID reader of claim 12, wherein the transceiver is further configured to:

determine a transmit power of the continuous RF wave; and

adjust the first frequency of the continuous RF wave in response to the transmit power.

21. The RFID reader of claim 20, wherein the transceiver is further configured to:

adjust the first frequency of the continuous RF wave to the second frequency in response to the transmit power being greater than or equal to a power threshold; and

maintain the continuous RF wave at the first frequency in response to the transmit power being less than the power threshold such that the continuous RF wave is at the first frequency when the backscattered RF wave of the first frequency is received.

22. A Radio Frequency Identification (RFID) reader, comprising:

means for transmitting a continuous radio frequency (RF) wave at a first frequency;

means for adjusting the first frequency of the continuous RF wave to a second frequency; and

means for receiving a backscattered RF wave at the first frequency from an RFID tag, the backscattered RF wave generated by the RFID tag in response to the continuous RF wave of the first frequency, wherein a difference between the first frequency and the second frequency is equal to or greater than a frequency difference threshold to reduce interference between the backscattered RF wave and the continuous RF wave.

23. The RFID reader of claim 22, further comprising means for filtering the backscattered RF wave to remove the continuous RF wave of the second frequency.

24. The RFID reader of claim 22, further comprising:

means for transmitting a message of a single transaction between the RFID reader and the RFID tag, utilizing the continuous RF wave of the first frequency; and

means for receiving a response to the message of the single transaction on the backscattered RF wave of the first frequency after adjusting the first frequency of the continuous RF wave to the second frequency.

25. A non-transitory computer-readable storage medium including computer-executable instructions recorded thereon, wherein executing the computer-executable instructions on one or more processors of a Radio Frequency Identification (RFID) reader causes the RFID reader to perform operations, comprising:

transmit a continuous radio frequency (RF) wave at a first frequency;

adjust the first frequency of the continuous RF wave to a second frequency; and

then

receive a backscattered RF wave at the first frequency from an RFID tag, the backscattered RF wave generated by the RFID tag in response to the continuous RF wave of the first frequency, wherein a difference between the first frequency and the second frequency is equal to or greater than a frequency difference threshold to reduce interference between the backscattered RF wave and the continuous RF wave.

26. The non-transitory computer-readable storage medium of claim 25, further comprising at least one instruction to cause the RFID reader to filter the backscattered RF wave to remove the continuous RF wave of the second frequency.

27. The non-transitory computer-readable storage medium of claim 25, further comprising at least one instruction to cause the RFID reader to:

transmit a message of a single transaction between the RFID reader and the RFID tag, utilizing the continuous RF wave of the first frequency; and

receive a response to the message of the single transaction on the backscattered RF wave of the first frequency after adjusting the first frequency of the continuous RF wave to the second frequency.

28. The non-transitory computer-readable storage medium of claim 27, further comprising at least one instruction to cause the RFID reader to continuously adjust the first frequency of the continuous RF wave during the single transaction between the RFID reader and the RFID tag.

29. The non-transitory computer-readable storage medium of claim 28, further comprising at least one instruction to cause the RFID reader to continuously adjust the first frequency of the continuous RF wave based on a sawtooth cycle during the single transaction between the RFID reader and the RFID tag.

30. The non-transitory computer-readable storage medium of claim 25, further comprising at least one instruction to cause the RFID reader to:

determine a transmit power of the continuous RF wave;

adjust the first frequency of the continuous RF wave to the second frequency in response to the transmit power being greater than or equal to a power threshold; and

maintain the continuous RF wave at the first frequency in response to the transmit power being less than the power threshold such that the continuous RF wave is at the first frequency when the backscattered RF wave of the first frequency is received.