Method an system for reading a dynamic set of tags bearing distinct ID codes
First Claim
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1. Method for reading a dynamic set of tags, each with a distinct ID code and located in the electromagnetic field of a polling device, the method comprising:
- identifying a previously unidentified tag via successive reading of their codes by means of transmitting and receiving signals between the polling device and the tags, characterized in that comprises carrying out a first read cycle during which each tag identified is locked and during which a sequence number is assigned to the tag identified, so as to allow for creating a list of all tags present in the field of the polling device; and
carrying out, during subsequent read cycles, an update of the list by reactivating the tags already listed, checking, from the reactivated tags, those tags still present in the field and those tags that have left the field, and adding the tags that have entered the field.
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Abstract
The invention relates to a method and system for reading a dynamic set of tags present in the electromagnetic field of a polling device, consisting in updating cyclically a list of tags present in the electromagnetic field and minimizing the time for checking the presence of tags already identified, by assigning to each of these tags a sequence number whose binary size is significantly smaller than that of the ID code and that allows to realize a “call” of the tags present by enumeration.
33 Citations
7 Claims
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1. Method for reading a dynamic set of tags, each with a distinct ID code and located in the electromagnetic field of a polling device, the method comprising:
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identifying a previously unidentified tag via successive reading of their codes by means of transmitting and receiving signals between the polling device and the tags, characterized in that comprises carrying out a first read cycle during which each tag identified is locked and during which a sequence number is assigned to the tag identified, so as to allow for creating a list of all tags present in the field of the polling device; and
carrying out, during subsequent read cycles, an update of the list by reactivating the tags already listed, checking, from the reactivated tags, those tags still present in the field and those tags that have left the field, and adding the tags that have entered the field. - View Dependent Claims (2, 3, 4)
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5. A method for reading a set of tags, each tag comprising a distinct ID code and located in the electromagnetic field of a polling device, the method comprising:
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initially identifying one or more tags present in the field, the step of initially identifying comprising;
identifying a tag through reading of the ID code, the reading occurring through transmitting and receiving signals between the polling device and the tags;
placing the read ID code into a list;
assigning a sequence number to the tag identified;
placing the identified tag in a list of tags present in the field of the polling device;
at the tag, locking the tag, the locking keeping the tag from being identified again; and
updating the list. - View Dependent Claims (6, 7)
unlocking any tags already listed and present in the field;
checking, from the unlocked tags, those tags still present in the field; and
changing the list based on the results of the step of checking from the unlocked tags.
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7. The method of claim 5, the step of updating comprising:
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checking for new tags present in the field; and
changing the list based on the results of the step of checking for new tags.
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Specification