Power-efficient technique for multiple tag discrimination
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United States of America Patent
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May 28, 1996
Grant Date -
N/A
app pub date -
Apr 21, 1995
filing date -
Apr 21, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
This invention provides a tag identification system and method for identifying tags in the range of a reader station where the tags are divided into smaller groups, where the tags are identified one group at a time so as to save power by powering off the tags that are not in the group currently being identified. Each tag puts itself in a group by performing calculations from parameters stored in itself and from parameters received from the reader station. In another variation of this invention, only tags which configure themselves to be activated at a final frequency are identified. The set of tags which configure themselves to be activated at the final frequency changes with each identification round until all tags in the range of the reader have been identified.
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