Anticollision protocol with fast read request and additional schemes for reading multiple transponders in an RFID system
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United States of America Patent
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Jul 18, 2006
Issued Date -
N/A
app pub date -
Jan 9, 2004
filing date -
Oct 27, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
Arbitration of multiple transponders, such as RFID tags, occurs in an interrogation field. The arbitration process is custom-tailored for individual applications, under software control, by the transponder reader or tag reader. Different wake-up slots are calculated for each tag during successive transmission cycles based upon the tag ID and the transmission cycle number. The tag reader may also send a special command to a tag to read its data and cause the tag to become decoupled from the environment. The tags may be selectively placed in either a tag-talk-first mode or a reader-talk-first mode. Furthermore, the tag reader may send a special fast read command to the tag which includes a read request and at least one parameter of the read request.
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