RF transponder identification system and protocol
First Claim
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1. An RF transponder identification system comprising:
- an interrogator operable to transmit a plurality of marker signals;
a plurality of transponders, each transponder having a random number associated therewith, a counter counting the number of marker signals received from the interrogator, transmission means to transmit an identification code when the number of marker signals received by the transponder equals the random number associated with the transponder, and random number generation means to generate a new random number each time the transponder transmits it identification code, the interrogator being operable to transmit an acknowledgement signal to the transponders.
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Abstract
An RF transponder identification system with an interrogator operable to transmit a plurality of marker signals and a plurality of transponder. Each transponder has a random number associated therewith, a counter counting the number of marker signals received from the interrogator and transmission means to transmit an identification code when the number of marker signals received by the transponder equals the random number associated with the transponder.
105 Citations
13 Claims
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1. An RF transponder identification system comprising:
- an interrogator operable to transmit a plurality of marker signals;
a plurality of transponders, each transponder having a random number associated therewith, a counter counting the number of marker signals received from the interrogator, transmission means to transmit an identification code when the number of marker signals received by the transponder equals the random number associated with the transponder, and random number generation means to generate a new random number each time the transponder transmits it identification code, the interrogator being operable to transmit an acknowledgement signal to the transponders. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- an interrogator operable to transmit a plurality of marker signals;
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8. An RF transponder identification protocol to enable unique identification of one or more transponders by an interrogator operable to transmit a plurality of marker signals, each transponder having a random number associated therewith, a counter to maintain a count of the number of marker signals received from the interrogator, transmission means to transmit a unique identification code, and random number generation means to generate a new random number, the protocol comprising the steps of:
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transmitting marker signals from the interrogator;
receiving the marker signals at the respective transponders;
each transponder increasing the marker signal count in response to each marker signal received by the transponder;
each transponder having a marker signal count equal to the random number associated with that transponder transmitting a unique identification code and generating a new random number; and
transmitting from the interrogator an acknowledgement signal in response to receipt of an identification code from a transponder. - View Dependent Claims (10, 11, 12)
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9. The protocol according to claim 9, wherein the marker signals are transmitted at non-uniform time intervals.
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13. In an RF transponder identification system comprising:
- an interrogator operable to transmit a plurality of marker signals;
a plurality of transponders, each transponder having a random number associated therewith, a counter counting the number of marker signals received from the interrogator, transmission means to transmit an identification code when the number of marker signals received by the transponder equals the random number associated with the transponder, and random number generation means to generate a new random number, the system being operable in accordance with a protocol to enable unique identification of one or more transponders by the interrogator, the protocol comprising the steps of;transmitting marker signals from the interrogator;
receiving the marker signals at the respective transponders;
each transponder increasing the marker signal count in response to each marker signal received by the transponder;
each transponder having a marker signal count equal to the random number associated with that transponder transmitting a unique identification code and generating a new random number; and
transmitting from the interrogator an acknowledgement signal in response to receipt of an identification code from a transponder.
- an interrogator operable to transmit a plurality of marker signals;
Specification