RFID tag receive signal strength indicator
First Claim
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1. A method for monitoring a radio frequency identification (RFID) reader communication signal in a RFID tag, comprising:
- (a) receiving at the tag a command having a timing parameter to measure a signal strength of a reader communication signal, wherein the timing parameter dictates a time for measuring the signal strength;
(b) measuring a strength of a received radio frequency communication signal from an output signal of a charge pump in the tag; and
(c) transmitting an indication of the strength of the radio frequency communication signal.
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Abstract
Methods, systems, and apparatuses for detecting a reader signal strength in a radio frequency identification (RFID) tag is described. A tag is configured to monitor an attribute of a reader transmitted signal, such as the signal strength. The tag generates an indication of the signal attribute, and transmits the indication of the signal attribute to the reader.
66 Citations
24 Claims
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1. A method for monitoring a radio frequency identification (RFID) reader communication signal in a RFID tag, comprising:
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(a) receiving at the tag a command having a timing parameter to measure a signal strength of a reader communication signal, wherein the timing parameter dictates a time for measuring the signal strength; (b) measuring a strength of a received radio frequency communication signal from an output signal of a charge pump in the tag; and (c) transmitting an indication of the strength of the radio frequency communication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for monitoring a radio frequency identification (RFID) reader communication signal in a RFID tag, comprising:
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means for receiving at the tag a command, having a timing parameter, to measure a signal strength of a reader communication signal, wherein the timing parameter dictates a time for measuring the signal strength; means for measuring a strength of a received radio frequency communication signal from an output signal of a charge pump in the tag; and means for transmitting an indication of the strength of the radio frequency communication signal.
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11. A radio frequency identification (RFID) tag, comprising:
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an antenna to receive a command, having a timing parameter, to measure a strength of a radio frequency communication signal, wherein the timing parameter dictates a time for measuring the signal strength; and a signal strength monitor module configured to measure the strength of the radio frequency communication signal received by the antenna from an output signal of a charge pump in the tag;
wherein the signal strength monitor module is further configured to generate an indication of the measured strength of the radio frequency communication signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method in a radio frequency identification (RFID) reader for monitoring transmitted signal strength, comprising:
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(a) transmitting to a tag a command, having a timing parameter, to measure a signal strength of a reader communication signal, wherein the timing parameter dictates a time for measuring the signal strength; (b) transmitting the reader communication signal; and (c) receiving from the tag an indication of the strength of the transmitted radio frequency communication signal from an output signal of a charge pump in the tag. - View Dependent Claims (23)
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24. A system in a radio frequency identification (RFID) reader communication for monitoring transmitted signal strength, comprising:
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means for transmitting to a tag a command, having a timing parameter, to measure a signal strength of a reader communication signal, wherein the timing parameter dictates a time for measuring the signal strength; and means for receiving from the tag an indication of the strength of a transmitted radio frequency communication signal from an output signal of a charge pump in the tag.
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Specification