RFID sensor array
First Claim
1. A method of monitoring an environment in which a radio frequency identification (RFID) system tracks the movement of articles through a supply chain, each article having attached thereto an RFID tag, the method comprising:
- receiving first information that comprises the signal strength of a detected radio frequency (RF) signal at one or more of a plurality of RFID readers (readers) that are located within the environment, wherein the received first information is sent from one or more detecting readers that were not attempting to read any RFID tags while the RF signal was being detected; and
storing into a memory device values representing a level of interference with RFID system performance, wherein each stored value is based on the received first information.
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Accused Products
Abstract
An RFID performance monitoring system may include systems, methods, or computer program products for collecting information related to the performance of an RFID system. One source of performance-related information can be the RFID readers, both during an active (reading) period and an inactive (listening) period. In various embodiments described herein, a performance monitoring system may collect performance-related information from RFID readers during both during their active and inactive periods.
118 Citations
32 Claims
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1. A method of monitoring an environment in which a radio frequency identification (RFID) system tracks the movement of articles through a supply chain, each article having attached thereto an RFID tag, the method comprising:
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receiving first information that comprises the signal strength of a detected radio frequency (RF) signal at one or more of a plurality of RFID readers (readers) that are located within the environment, wherein the received first information is sent from one or more detecting readers that were not attempting to read any RFID tags while the RF signal was being detected; and
storing into a memory device values representing a level of interference with RFID system performance, wherein each stored value is based on the received first information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of monitoring an environment in which a radio frequency identification (RFID) system tracks the movement of articles through a supply chain, each article having attached thereto an RFID tag, the method comprising:
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receiving first information that comprises the signal strength of a detected radio frequency (RF) signal at one or more of a plurality of RFID readers (readers) that are located within the environment, wherein the received first information is sent from one or more detecting readers that were not attempting to read any RFID tags while the RF signal was being detected;
storing into a memory device one or more values representing a level of interference with RFID system performance, wherein each stored value comprises a measurement of the RF signal strength detected at a corresponding one of the detecting readers; and
if any one of the stored values exceeds a corresponding predetermined threshold during a read attempt, performing a corrective action. - View Dependent Claims (20, 21, 22, 23)
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24. A method of monitoring an environment in which a radio frequency identification (RFID) system tracks the movement of articles through a supply chain, each article having attached thereto an RFID tag, the method comprising:
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sending a command to one of a plurality of RFID readers (readers) in the RFID system to transmit a radio frequency (RF) signal encoded with information that identifies the transmitting reader;
receiving first information that comprises information about the signal strength of a detected radio frequency (RF) signal at one or more of a plurality of readers that are located within the environment, wherein the received first information further comprises information that identifies the transmitting reader, and the received first information is sent from one or more detecting readers that were not attempting to read any RFID tags while the RF signal was being detected;
storing into a memory device one or more values representing a level of interference with RFID system performance, wherein each stored value comprises a measurement of the RF signal strength detected at a corresponding one of the detecting readers; and
if any one of the stored values exceeds a corresponding predetermined threshold, then;
(1) selecting two or more readers to multiplex based the stored values; and
(2) operating the selected readers to attempt to read RFID tags only at non-overlapping times. - View Dependent Claims (25, 26, 27)
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28. A computer program product (CPP) tangibly embodied in an information carrier and containing instructions that, when executed, cause a processor to perform operations to monitor an environment in which a radio frequency identification (RFID) system tracks the movement of articles through a supply chain, each article having attached thereto an RFID tag, the operations comprising:
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receive first information that comprises the signal strength of a detected radio frequency (RF) signal at one or more of a plurality of RFID readers (readers) that are located within the environment, wherein the received first information is sent from detecting readers that were not attempting to read any RFID tags while the RF signal was being detected;
store into a memory device values representing a level of interference with RFID system performance, wherein each stored value is based on the received first information; and
if any one of the stored values exceeds a corresponding predetermined threshold during a read attempt, performing a corrective action. - View Dependent Claims (29, 30, 31, 32)
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Specification