Object tracking
First Claim
1. A method of tracking an object tagged with a radio frequency identification tag having an identification code using a network of readers, wherein a reader interrogates the tag by transmitting the tag'"'"'s identification code and, the tag responds to interrogation by transmitting a response if it receives the tag'"'"'s identification code and does not respond if it receives an identification code which is not the tag'"'"'s identification code, and wherein the network of readers has one or more uncovered areas not covered by an interrogation field of any of the readers, the method comprising:
- identifying that an object tagged with the tag has left a covered area covered by an interrogation field of a reader;
identifying one or more readers monitoring points of access to one or more uncovered areas not covered by an interrogation field of any of the readers, the one or more uncovered areas located adjacently to the covered area such that the object passes directly into one of the one or more uncovered areas to leave the covered area;
directing the one or more readers to start interrogating the tag repeatedly and concurrently by transmitting the tag'"'"'s identification code; and
in response to at least one of the interrogating readers receiving a response from the tag, directing other interrogating readers to stop interrogating the tag.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of tracking an object (1) tagged with a radio frequency identification tag (2) having an identification code using a network of readers (3) is described. A reader (3) interrogates the tag (2) by transmitting its identification code. In response to receiving its identification code, the tag identifies itself to the reader. Otherwise, it does not identify itself. The method comprises identifying an expected location of the object and directing one or more selected readers according to the expected location to interrogate the tag using its identification code.
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Citations
25 Claims
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1. A method of tracking an object tagged with a radio frequency identification tag having an identification code using a network of readers, wherein a reader interrogates the tag by transmitting the tag'"'"'s identification code and, the tag responds to interrogation by transmitting a response if it receives the tag'"'"'s identification code and does not respond if it receives an identification code which is not the tag'"'"'s identification code, and wherein the network of readers has one or more uncovered areas not covered by an interrogation field of any of the readers, the method comprising:
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identifying that an object tagged with the tag has left a covered area covered by an interrogation field of a reader; identifying one or more readers monitoring points of access to one or more uncovered areas not covered by an interrogation field of any of the readers, the one or more uncovered areas located adjacently to the covered area such that the object passes directly into one of the one or more uncovered areas to leave the covered area; directing the one or more readers to start interrogating the tag repeatedly and concurrently by transmitting the tag'"'"'s identification code; and in response to at least one of the interrogating readers receiving a response from the tag, directing other interrogating readers to stop interrogating the tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 22)
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12. Apparatus for tracking an object tagged with a radio frequency identification tag having an identification code using a network of readers, wherein a reader interrogates the tag by transmitting the tag'"'"'s identification code and the tag responds to interrogation by transmitting a response if it receives the tag'"'"'s identification code and does not respond if it receives an identification code which is not the tag'"'"'s identification code, and wherein the network of readers has one or more uncovered areas not covered by an interrogation field of any of the readers, the apparatus comprising:
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means for identifying that an object tagged with the tag has left a covered area covered by an interrogation field of a reader; means for identifying one or more readers monitoring points of access to one or more uncovered areas not covered by an interrogation field of any of the readers, the one or more uncovered areas located adjacently to the covered area such that the object passes directly into one of the one or more uncovered areas to leave the covered area; and means for directing the one or more readers to start interrogating the tag repeatedly and concurrently by transmitting the tag'"'"'s identification code and in response to at least one of the interrogating readers receiving a response from the tag, directing other interrogating readers to stop interrogating the tag. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 23, 24, 25)
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20. A reader for interrogating a radio frequency identification tag, wherein the reader is configured to interrogate the tag by transmitting the tag'"'"'s an identification code and the tag responds to interrogation by transmitting a response if it receives the tag'"'"'s identification code and does not respond if it receives an identification code which is not the tag'"'"'s identification code, the reader connectable to other radio frequency identification tag readers to form a network of readers that has one or more uncovered areas not covered by an interrogation field of any of the readers, the reader comprising:
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means for identifying that an object tagged with the tag has left a covered area covered by an interrogation field of a reader; means for identifying one or more readers monitoring points of access to one or more uncovered areas not covered by an interrogation field of any of the readers, the one or more uncovered areas located adjacently to the covered area such that the object passes directly into one of the one or more uncovered areas to leave the covered area; and means for directing the one or more readers to start interrogating the tag repeatedly and concurrently by transmitting the tag'"'"'s identification code and in response to at least one of the interrogating readers receiving a response from the tag, directing other interrogating readers to stop interrogating the tag.
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21. Apparatus for tracking an object tagged with a radio frequency identification tag having an identification code using a network of readers, wherein a reader interrogates the tag by transmitting the tag'"'"'s identification code and the tag responds to interrogation by transmitting a response if it receives the tag'"'"'s identification code and does not respond if it receives an identification code which is not the tag'"'"'s identification code, and wherein the network of readers has one or more uncovered areas not covered by an interrogation field of any of the readers, the apparatus comprising:
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a tracking unit arranged to identify that an object tagged with the tag has left a covered area covered by an interrogation field of a reader; and a control unit arranged to identify one or more readers monitoring points of access to one or more uncovered areas not covered by an interrogation field of any of the readers, the one or more uncovered areas located adjacently to the covered area such that the object passes directly into one of the one or more uncovered areas to leave the covered area and to direct the one or more readers to start interrogating the tag repeatedly and concurrently by transmitting the tag'"'"'s identification code and, in response to at least one of the interrogating readers receiving a response from the tag, to direct other interrogating readers to stop interrogating the tag.
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Specification