Methods and apparatuses to identify devices
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United States of America Patent
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Nov 1, 2016
Grant Date -
Dec 4, 2014
app pub date -
Jun 12, 2014
filing date -
Nov 7, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Embodiments of the present invention include systems with Readers and Tags in which a Reader queries the Tags with a parameter that includes a level of probability of reply according to which the Tags individually and randomly decide whether or not to reply. In one embodiment, the Tags can switch between two states: A and B. The query command also specifies a state (A or B) so that only the Tags in the specified state can reply. After successfully sending the Tag identification data from a Tag to the Reader, the Tag switches to the other state from the specified state. In one embodiment, the operations about the two states are symmetric. In one embodiment, the Tags can remember the parameters used in a query so that a short form of query command can be used to repeat the query with the same query parameters.
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