Systems and methods for slot classification
First Claim
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1. A method of classifying a slot of an inventory round, each slot corresponding to a time period for response by one or more of RFID tags, the method comprising:
- (a) transmitting, to one or more RFID tags, a message during a slot of an inventory round;
(b) receiving a response from at least some of the one or more RFID tags, the response comprising a pilot tone;
(c) analyzing the received responses for the presence of the pilot tone, the analysis comprising detecting a phase reversal within a modulation coding in the received response; and
(d) classifying a respective slot as empty in response to a detected phase reversal within a specified time period.
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Abstract
Systems and methods for inventory round slot classification are described. The method includes transmitting, to zero or more RFID tags, a message during a slot of an inventory round and receiving a response from at least some of the zero or more RFID tags. The method also includes analyzing a received response for the presence of the pilot tone and classifying a respective slot in response to the analysis.
42 Citations
55 Claims
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1. A method of classifying a slot of an inventory round, each slot corresponding to a time period for response by one or more of RFID tags, the method comprising:
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(a) transmitting, to one or more RFID tags, a message during a slot of an inventory round; (b) receiving a response from at least some of the one or more RFID tags, the response comprising a pilot tone; (c) analyzing the received responses for the presence of the pilot tone, the analysis comprising detecting a phase reversal within a modulation coding in the received response; and (d) classifying a respective slot as empty in response to a detected phase reversal within a specified time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for classifying a slot of an inventory round, each slot corresponding to a time period for response by one or more of RFID tags, the system comprising:
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a transmitter that transmits, to one or more RFID tags, a message during a slot of an inventory round; a receiver that receives a response from at least one of the one or more RFID tags, the response comprising a pilot tone; and a processing unit in communication with the receiver, the processing unit analyzing the received response for the presence of a pilot tone, the analysis comprising detecting a phase reversal within a modulation coding, and classifying a respective slot in response to the analysis, wherein the processing unit detects a phase reversal in the received response and classifies the respective slot as empty in response to a detected phase reversal within a specified time period. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A system for classifying a slot of an inventory round, each slot corresponding to a time period for response by one or more of RFID tags, the system comprising:
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means for transmitting, to one or more RFID tags, a message during a slot of an inventory round; means for receiving a response from at least some of the one or more RFID tags, the response comprising a pilot tone; means for analyzing the received response for the presence of the pilot tone, the analysis comprising detecting a phase reversal within a modulation coding; and means for classifying a respective slot in response to the analysis; wherein the means for analyzing comprises means for detecting a phase reversal in the received response, and the means for classifying comprises means for classifying the respective slot as empty in response to a detected phase reversal within a specified time period. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification