Efficient protocol for reading RFID tags
First Claim
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1. A method of communicating an identifier from an RFID tag to a tag reader, wherein the identifier includes N data elements, and wherein the method comprises:
- selecting M data elements of the identifier based on a start position R1 and an end position R2 defining a limiting range within the identifier, wherein M<
N; and
,transmitting only the selected M data elements from the RFID tag to the tag reader so as to identify the RFID tag to the tag reader.
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Abstract
An RFID tag has an N data element tag identifier that uniquely identifies the RFID tag. The RFID tag selects M data elements of the tag identifier, where M<N, and transmits only the selected M data elements to a tag reader so as to identify the RFID tag to the tag reader.
50 Citations
32 Claims
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1. A method of communicating an identifier from an RFID tag to a tag reader, wherein the identifier includes N data elements, and wherein the method comprises:
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selecting M data elements of the identifier based on a start position R1 and an end position R2 defining a limiting range within the identifier, wherein M<
N; and
,transmitting only the selected M data elements from the RFID tag to the tag reader so as to identify the RFID tag to the tag reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of identifying an RFID tag comprising:
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transmitting a signal from a tag reader to the RFID tag, wherein the RFID tag includes an identifier comprising N data elements; transmitting a start position R1 and an end position R2 from the tag reader to the RFID tag, wherein the start position R1 and the end position R2 define M data elements to be transmitted by the RFID tag to the tag reader; receiving only M of the N data elements from the RFID tag, wherein M<
N; and
,identifying the RFID tag from only the M data elements. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An RFID tag uniquely identified by an N data element tag identifier comprising:
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a transmitter arranged to transmit M data elements so as to identify the RFID tag, wherein the M data elements comprises a subset of the N data element tag identifier, and wherein M<
N;a receiver arranged to receive a message from a tag reader; and
,a memory storing the N data element tag identifier and storing a definition of the M data elements, wherein the definition comprises a start data element position R1 and an end data element position R2, wherein the start data element position R1 defines a start data element location within the N data element tag identifier, and wherein the end data element position R2 defines an end data element location within the N data element tag identifier. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification