Method for resolving signal collisions between multiple RFID transponders in a field
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Sep 3, 1997
filing date -
Sep 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Communications between an RFID interrogator and an RFID transponder require that no more than one transponder be present in the reading range of the interrogator and transmitting into motion at any given time. If multiple transponders are in the field, then a collision between the return signals of the transponders occurs, rendering the signals unreadable. A method to resolve the collisions and allow for accurate transmission of each transponder's data is given. This method is especially effective over other methods when the transponder is a read-only type of device, whereby there is no communications interrogator on board the read-only transponder.
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