Multiple protocol transponder
First Claim
1. A multi protocol transponder for a communications network operative according to a communications protocol from a plurality of communications protocols under which the transponder is operative, the transponder comprising:
- means for receiving a first RF signal transmitted according to the communications protocol;
means for sequentially identifying the communications protocol from the first RF signal;
means for executing the identified communications protocol to generate a second RF signal; and
means for transmitting the second RF signal according to the identified communications protocol, wherein;
said means for transmitting comprises;
a transmit antenna;
backscatter means for transforming the second RF signal to radiated energy by modulated backscatter; and
active transmission means for transforming the second RF signal to radiated energy by active transmission, andthe means for executing the identified communications protocol having means for selecting either the backscatter means or the active transmission means for operation in response to the identified communications protocol.
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0 Petitions
Accused Products
Abstract
A multi protocol transponder for a communications network having a antenna for receiving a first RF signal transmitted according to a communications protocol and a detector for identifying the communications protocol from the first RF signal. A protocol controller is provided for executing the identified communications protocol to generate a second RF signal. Thereafter an antenna transmits the second RF signal according to the communications protocol either by active transmission or modulated backscatter. The transponder may implement a variety of wide area and localized lane based protocols for Automatic Vehicle Identification systems such as CVO and Toll systems.
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Citations
23 Claims
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1. A multi protocol transponder for a communications network operative according to a communications protocol from a plurality of communications protocols under which the transponder is operative, the transponder comprising:
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means for receiving a first RF signal transmitted according to the communications protocol; means for sequentially identifying the communications protocol from the first RF signal; means for executing the identified communications protocol to generate a second RF signal; and means for transmitting the second RF signal according to the identified communications protocol, wherein; said means for transmitting comprises; a transmit antenna; backscatter means for transforming the second RF signal to radiated energy by modulated backscatter; and active transmission means for transforming the second RF signal to radiated energy by active transmission, and the means for executing the identified communications protocol having means for selecting either the backscatter means or the active transmission means for operation in response to the identified communications protocol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multi protocol transponder for a communications network operative according to a communications protocol from a plurality of communications protocols under which the transponder is operative, the transponder comprising:
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means for receiving a first RF signal transmitted according to the communications protocol; means for sequentially identifying the communications protocol from the first RF signal; means for executing the identified communications protocol to generate a second RF signal; and means for transmitting the second RF signal according to the identified communications protocol; wherein the plurality of communications protocols comprises at least one communications protocol selected from the group of protocols comprising public Title 21 protocol, public TDMA Wide Area protocol, public TDMA Lane Based protocol, and proprietary IAG protocol. - View Dependent Claims (11, 12)
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13. A multi protocol transponder for a communications network operative according to a communications protocol from a plurality of communications protocols under which the transponder is operative, the transponder comprising:
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means for receiving a first RF signal transmitted according to the communications protocol, the first RF signal comprising a set of RF signals; means for sequentially identifying the communications protocol from the first RF signal; means for executing the identified communications protocol to generate a second RF signal; and means for transmitting the second RF signal according to the identified communications protocol.
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14. A method for operating a multi protocol transponder in a communications network for reader-transponder communications operating according to a communications protocol from a plurality of communications protocols under which the transponder is operable, the method comprising the steps of:
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receiving and transforming radiated energy to a first RF signal; identifying the communications protocol sequentially from the first RF signal; executing the identified communications protocol to generate a second RF signal; transmitting the second RF signal according to the identified communications protocol, wherein; the step of transmitting the second RF signal comprises; selectively, in response to the identified communications protocol; transforming the second RF signal to radiated energy by modulated backscatter;
ortransforming the second RF signal to radiated energy by active transmission. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for operating a multi protocol transponder in a communications network for reader-transponder communications operating according to a communications protocol from a plurality of communications protocols under which the transponder is operable, the method comprising the steps of:
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receiving and transforming radiated energy to a first RF signal; identifying the communications protocol sequentially from the first RF signal; executing the identified communications protocol to generate a second RF signal; transmitting the second RF signal according to the identified communications protocol wherein the plurality of communications protocols comprises at least one communications protocol selected from the group of protocols comprising public Title 21 protocol, public TDMA Wide Area protocol, public TDMA Lane Based protocol, and proprietary IAG protocol. - View Dependent Claims (22, 23)
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Specification