RFID-based data reduction system and techniques
First Claim
Patent Images
1. A method for tracking events using a radio frequency identification (RFID) tag, the method comprising:
- designating a bit window in a memory on a radio frequency identification (RFID) tag to record occurrences of a RFID event, the bit window having multiple bits, the RFID event occurring each time the RFID tag crosses into a writing area for a particular RFID interrogator;
marking one of the bits in the designated bit window each time the RFID event occurs; and
counting the number of occurrences of the RFID event by counting the -a number of marked bits in the designated bit window.
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Abstract
A method for tracking events using a radio frequency identification (RFID) tag may include reserving a bit window in a memory on a radio frequency identification (RFID) tag, the bit window having multiple bits, randomly marking one of the bits in the bit window each time a RFID event occurs, counting a number of marked bits in the bit window, and determining a number of the RFID events using the counted number of the marked bits and a size of the bit window.
11 Citations
26 Claims
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1. A method for tracking events using a radio frequency identification (RFID) tag, the method comprising:
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designating a bit window in a memory on a radio frequency identification (RFID) tag to record occurrences of a RFID event, the bit window having multiple bits, the RFID event occurring each time the RFID tag crosses into a writing area for a particular RFID interrogator; marking one of the bits in the designated bit window each time the RFID event occurs; and counting the number of occurrences of the RFID event by counting the -a number of marked bits in the designated bit window. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for tracking events using a radio frequency identification (RFID) tag, the method comprising:
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detecting a radio frequency identification (RFID) tag when the RFID tag crosses a writing area for a RFID interrogator, the RFID interrogator being associated with a unique writer identifier; reading, by the RFID interrogator that detected the RFID tag, a last writer identifier from the RFID tag; writing, by the RFID interrogator that detected the RFID tag, a data packet to the RFID tag when the last writer identifier does not match the unique writer identifier of the RFID interrogator that detected the RFID tag, the data packet comprising a timestamp and the unique writer identifier associated with the RFID interrogator that detected the RFID tag; and storing, by the RFID interrogator that detected the RFID tag, the data packet on the RFID tag in a memory of the RFID tag, the memory being configured to store multiple data packets. - View Dependent Claims (8, 9, 10, 11)
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12. A system, comprising:
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a radio frequency identification (RFID) tag that comprises an antenna and a memory, the memory comprising a designated bit window having multiple bits, the bit window being designated to record occurrences of a RFID event, the RFID event occurring each time the RFID tag crosses into a writing area for a particular RFID interrogator, the particular RFID interrogator comprising an antenna and a radio frequency module, wherein the particular RFID interrogator is configured to communicate with the RFID tag and to mark one of the bits in the designated bit window in the memory each time a RFID event occurs; and a control module that is configured to count the number of occurrences of the RFID event by counting the a number of marked bits in the designated bit window in the memory. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A system, comprising:
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a radio frequency identification (RFID) tag that comprises an antenna and a memory; a RFID interrogator comprising an antenna, a radio frequency module and a unique writer identifier, wherein the RFID interrogator is configured to; detect, by the RFID interrogator, the RFID tag when the RFID tag crosses a writing area for the RFID interrogator, read, by the RFID interrogator that detected the RFID tag, a last writer identifier from the RFID tag, and write, by the RFID interrogator that detected the RFID tag, a data packet to the RFID tag when the last writer identifier does not match the unique writer identifier for the RFID interrogator that detected the RFID tag, the data packet comprising a timestamp and the unique writer identifier associated with the RFID interrogator that detected the RFID tag. - View Dependent Claims (20, 21, 22)
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23. A radio frequency identification (RFID) tag, comprising:
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an antenna that is configured to receive one or more commands; a memory comprising a bit window having multiple bits, the bit window reserved to record occurrences of a RFID event, the RFID event occurring each time the RFID tag crosses into a writing area for a particular RFID interrogator; and a control module that is configured to control the antenna and the memory and that is configured to receive and to process a write command to one of the bits in the bit window each time the RFID event occurs. - View Dependent Claims (24, 25, 26)
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Specification