RFID integrated circuit identifier self-check
First Claim
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1. A method for a Radio Frequency Identification (RFID) integrated circuit (IC) to indicate a corrupted identifier, the method comprising:
- upon extracting an operating power from a received RF signal, retrieving a first identifier and a check code from an IC nonvolatile memory, the check code based on and used to check a correctness of the first identifier;
determining that the check code does not correspond to the first identifier and that the first identifier is therefore corrupted;
adjusting protocol control information associated with the first identifier, wherein the unadjusted protocol control information indicates that the first identifier has a nonzero length and the adjusted protocol control information indicate that the first identifier has a zero length; and
upon subsequently receiving a command requesting the first identifier, transmitting a reply to the command including at least the adjusted protocol control information.
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Abstract
A Radio Frequency Identification (RFID) tag IC stores an identifier and a check code. The IC determines whether the stored identifier is corrupted by comparing it to the check code. If the stored identifier does not correspond to the check code then the IC may terminate operation or indicate an error. The IC may also reconstruct the correct identifier from the check code.
28 Citations
15 Claims
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1. A method for a Radio Frequency Identification (RFID) integrated circuit (IC) to indicate a corrupted identifier, the method comprising:
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upon extracting an operating power from a received RF signal, retrieving a first identifier and a check code from an IC nonvolatile memory, the check code based on and used to check a correctness of the first identifier; determining that the check code does not correspond to the first identifier and that the first identifier is therefore corrupted; adjusting protocol control information associated with the first identifier, wherein the unadjusted protocol control information indicates that the first identifier has a nonzero length and the adjusted protocol control information indicate that the first identifier has a zero length; and upon subsequently receiving a command requesting the first identifier, transmitting a reply to the command including at least the adjusted protocol control information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for a Radio Frequency Identification (RFID) integrated circuit (IC) to avoid sending a corrupted identifier, the method comprising:
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upon extracting an operating power from a received RF signal, retrieving a first identifier and a check code from an IC nonvolatile memory, the check code based on and used to check a correctness of the first identifier; determining that the check code does not correspond to the first identifier and that the first identifier is therefore corrupted; reconstructing a correct identifier from at least the first identifier and the check code; and upon subsequently receiving a command requesting the first identifier, transmitting a reply to the command including the correct identifier. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification