Detecting activity of RFID objects via multiple tags/readers
First Claim
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1. An apparatus, comprising a device to determine an indication of movement of an object, the object comprising a first radio frequency identification (RFID) tag, based on a change in successive values of a first parameter, the values of the first parameter to be determined by:
- receiving a first quantity of responses from the first RFID tag by a first RFID reader during a first time period;
deriving the value of the first parameter, the value indicative of the first quantity; and
repeating the operations of receiving the first quantity and deriving the value of the first parameter to determine additional ones of the values for time periods successive to the first time period.
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Abstract
Various embodiments or the invention may use changes in the quantity of responses received from an RFID-tagged object to derive parameters that indicate probably movement or the object. In some embodiments, multiple RFID tags and/or multiple RFID readers may be used in conjunction with one another to further refine the probability of movement and/or to indicate the probability of a particular type of movement.
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Citations
20 Claims
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1. An apparatus, comprising
a device to determine an indication of movement of an object, the object comprising a first radio frequency identification (RFID) tag, based on a change in successive values of a first parameter, the values of the first parameter to be determined by: -
receiving a first quantity of responses from the first RFID tag by a first RFID reader during a first time period;
deriving the value of the first parameter, the value indicative of the first quantity; and
repeating the operations of receiving the first quantity and deriving the value of the first parameter to determine additional ones of the values for time periods successive to the first time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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transmitting a plurality of signals to a radio frequency identification (RFID) tag;
receiving a plurality of responses from the RFID tag responsive to said transmitting;
deriving a parameter indicative of ratio of a quantity of the received responses to a reference number;
repeating the operations of transmitting, receiving, and deriving to produce a series of values for the parameter, each value associated with a separate period of time; and
determining a first indication of movement by an object comprising the RFID tag, based on differences in the values in the series. - View Dependent Claims (14, 15, 16)
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17. An article comprising
a machine-readable medium that provides instructions, which when executed by a computing platform, cause said computing platform to perform operations comprising: -
operating on a first set of values for a first parameter, each of the values indicating a response rate for a quantity of responses received by a first radio frequency identification (RFID) reader from a first RFID tag on an object; and
examining differences between the values in the first set to determine a first indication of motion by the object. - View Dependent Claims (18, 19, 20)
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Specification