RFID tag and RFID reader
AssigneesFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Friedrich-Alexander-Universitaet Erlangen-Nuernberg
InventorsHazem Elsaid Ibrahim, Hamed Kenawy, Joerg Robert, Albert Heuberger, Wolfram Strauss
Life of this patent
Estimating the term…
Abstract
What is described is an Radio Frequency Identification (RFID) tag configured for communicating with an Radio Frequency Identification (RFID) reader, wherein the RFID tag is configured to receive a query command from the RFID reader, to measure a duration of a TRcal signal comprised by the query command, and to determine an individual Backscatter Link Frequency for communicating with the RFID reader based on the measured duration of the TRcal signal. The invention also refers to an RFID reader and to a corresponding method.
Claims10
A radio Frequency Identification (RFID) tag configured for communicating with an Radio Frequency Identification (RFID) reader,
- wherein said RFID tag is configured to receive a query command from said RFID reader,
- wherein said RFID tag is configured to measure a duration of a TRcal signal comprised by said query command, and
- wherein said RFID tag is configured to determine an individual Backscatter Link Frequency (BLF) for communicating with said RFID reader based on said measured duration of said TRcal signal and on an individual number,
- wherein said RFID tag is configured to determine said individual number by generating a random number.
A Radio Frequency Identification (RFID) reader configured for communicating with an Radio Frequency Identification (RFID) tag,
- wherein said RFID reader is configured to send a query command to said RFID tag, and
- wherein said query command enables said RFID tag to determine a Backscatter Link Frequency (BLF) for communicating with said RFID reader,
- wherein said RFID reader is configured to send said query command comprising a TRcal signal with a given duration within said query command,
- wherein said TRcal signal ends with a pulse with a given pulse width, and
- wherein a part of said TRcal signal between a beginning of said TRcal signal and a beginning of said pulse differs from a signal comprising a constant value by comprising a slope with a given value ending at said beginning of said pulse, thereby rendering harder the determination of the BLF by the RFID tag.
A method for recognizing at least one Radio Frequency Identification (RFID) tag by a Radio Frequency Identification (RFID) reader,
- comprising:
- sending a query signal to said RFID tag,
- determining by said RFID tag an Backscatter Link Frequency (BLF), and
- communicating by said RFID tag using said BLF,
- wherein:
- said RFID tag determines as the BLF an individual Backscatter Link Frequency (BLF) for communicating with said RFID reader based on a measured duration of said TRcal signal and on an individual number, wherein said RFID tag determines said individual number by generating a random number, and/or
- said RFID reader sends said query command comprising a TRcal signal with a given duration within said query command, wherein said TRcal signal ends with a pulse with a given pulse width, and wherein a part of said TRcal signal between a beginning of said TRcal signal and a beginning of said pulse differs from a signal comprising a constant value by comprising a slope with a given value ending at said beginning of said pulse, thereby rendering harder the determination of the Backscatter Link Frequency (BLF) by the RFID tag.
Dependencies are inferred from the claim text.