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.
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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
25 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. 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. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification