Methods and apparatuses to identify devices
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United States of America Patent
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May 11, 2010
Grant Date -
May 26, 2005
app pub date -
Nov 5, 2004
filing date -
Nov 7, 2003
priority date (Note) -
In Force
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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