Electronic label reading with simultaneous identification of their code
First Claim
1. Process for reading a set of electronic tags, each comprising a distinct identification code with N bits located within the electromagnetic field of a query device, characterized in that it consists of simultaneously identifying the codes of all tags present in the electromagnetic field, by determining the N bits of the identification codes, bit rank by bit rank.
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Abstract
The invention relates to a process for simultaneously reading a set of electronic tags, each comprising a distinct identification code with N bits located within the electromagnetic field of a query device, consisting of:
for each bit rank k, querying all tags to draw up a list of hypothetical codes containing all possible codes for bit rank k, these possible codes being built up starting from bits determined during queries of ranks less than k, and two possible sets of the value of the bits for rank k; and
after each query, producing a real list produced for all tags that responded to the query.
The invention also relates to a system for using this process.
24 Citations
9 Claims
- 1. Process for reading a set of electronic tags, each comprising a distinct identification code with N bits located within the electromagnetic field of a query device, characterized in that it consists of simultaneously identifying the codes of all tags present in the electromagnetic field, by determining the N bits of the identification codes, bit rank by bit rank.
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9. System for reading a set of tags by a query device, the tags and the query device each comprising means of sending/receiving signals, and sequencing means and storage means, the tags comprising means of calculating and managing order numbers, and means of storing order numbers, characterised in that the query device also comprises means of managing global queries for all tags, and means of calculating the tag order number, at each bit rank.
Specification