Methods and systems of receiving data payload of RFID tags
First Claim
Patent Images
1. A method comprising:
- (a) selecting, by each of a plurality of radio frequency identification (RFID) tags, a time window within which to transmit;
(b) sending a start signal from a RFID reader to the RFID tags, the start signal indicative of the start of a first time window;
(c) transmitting a signal, by each of the RFID tags, in the respective time windows without receiving input from the RFID reader, wherein at least two RFID tags transmit the signal in the same time window;
(d) for each of the RFID tags that transmitted the signal during the same time window, selecting a new time window and retransmitting the signal without receiving input from the RFID reader; and
(e) repeating step (d) until none of the RFID tags transmit the signal in the same time window.
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Abstract
Methods and systems of receiving data payload of RFID tags. At least some of the illustrative embodiments are methods comprising selecting (by each of a plurality of radio frequency identification (RFID) tags) a time window within which to transmit (the selecting to create respective time windows), sending a start signal from a RFID reader to the plurality of RFID tags (the start signal indicative of the start of a first time window), and transmitting a signal by each of the plurality of RFID tags in the respective time windows.
126 Citations
26 Claims
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1. A method comprising:
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(a) selecting, by each of a plurality of radio frequency identification (RFID) tags, a time window within which to transmit; (b) sending a start signal from a RFID reader to the RFID tags, the start signal indicative of the start of a first time window; (c) transmitting a signal, by each of the RFID tags, in the respective time windows without receiving input from the RFID reader, wherein at least two RFID tags transmit the signal in the same time window; (d) for each of the RFID tags that transmitted the signal during the same time window, selecting a new time window and retransmitting the signal without receiving input from the RFID reader; and (e) repeating step (d) until none of the RFID tags transmit the signal in the same time window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio frequency identification (RFID) tag comprising:
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a tag antenna; and a first RFID circuit coupled to the tag antenna; wherein the first RFID circuit is configured to transmit a first message to a RFID reader, transmission of the first message beginning at a particular time selected at random by the RFID tag without input from the RFID reader; wherein the first message is transmitted at a same particular time as a second message transmitted by a second RFID tag within a detection range of the RFID reader, wherein a different particular time to retransmit the first and second messages is selected such that the first RFID tag and the second RFID tag do not retransmit the corresponding message at the same particular time, the retransmission occurring without input from the RFID reader. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system comprising:
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a reading antenna; and a radio frequency identification (RFID) reader coupled to the reading antenna; wherein the RFID reader is configured to simultaneously activate a plurality of RFID tags, and the RFID reader is configured to receive responses from all of the RFID tags without further communication to the RFID tags from the RFID reader, each RFID tag response being sent at a time window; wherein at least two RFID tag responses are sent at the same time window; and wherein different time windows are selected for the RFID tags that sent responses at the same time window and the responses are resent without receiving input from the RFID reader such that none of the responses are sent at the same time window. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification