METHOD FOR CALIBRATING AN ONBOARD UNIT, SYSTEM, AND ONBOARD UNIT THEREFOR
First Claim
1. A method for calibrating an onboard unit of a vehicle identification system, the method comprising:
- emitting at least one polling message from a first radio beacon;
in the first radio beacon, determining a link margin of a communication with a first onboard unit by evaluating a response message of the first onboard unit to the at least one polling message; and
sending a configuration message from the first radio beacon or a second radio beacon to the first onboard unit or to a second onboard unit with a same characteristic as the first onboard unit to adjust a receive sensitivity or a transmit power of the first or the second onboard unit, respectively, to a level derived from the determined link margin.
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Abstract
The disclosed subject-matter relates to a method for calibrating an onboard unit of a vehicle identification system, the method comprising: emitting at least one polling message from a first radio beacon; in the first radio beacon, determining a link margin of a communication with a first onboard unit by evaluating a response message of the first onboard unit to the polling message(s); and sending a configuration message from the first radio beacon or a second radio beacon to the first onboard unit or to a second onboard unit with a same characteristic as the first onboard unit to adjust a receive sensitivity or a transmit power of the first or the second onboard unit, respectively, to a level derived from the determined link margin. Alternative embodiments relate to a system and to an onboard unit used in the method.
12 Citations
17 Claims
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1. A method for calibrating an onboard unit of a vehicle identification system, the method comprising:
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emitting at least one polling message from a first radio beacon; in the first radio beacon, determining a link margin of a communication with a first onboard unit by evaluating a response message of the first onboard unit to the at least one polling message; and sending a configuration message from the first radio beacon or a second radio beacon to the first onboard unit or to a second onboard unit with a same characteristic as the first onboard unit to adjust a receive sensitivity or a transmit power of the first or the second onboard unit, respectively, to a level derived from the determined link margin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for calibrating an onboard unit of a vehicle identification system,
wherein a first radio beacon is configured to determine a link margin of a communication with a first onboard unit by emitting at least one polling message and evaluating a response message of the first onboard unit to the at least one polling message, and wherein the first radio beacon or a second radio beacon is configured to emit a configuration message to the first onboard unit or to a second onboard unit with a same characteristic as the first onboard unit to adjust a receive sensitivity or a transmit power of the first or the second onboard unit, respectively, to a level derived from the determined link margin.
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16. An onboard unit for a vehicle identification system, comprising:
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a transceiver for wirelessly communicating with a radio beacon, which transceiver is configured to emit messages with a transmit power and has a receive sensitivity for receiving messages, and a processor, which can receive messages from the radio beacon via the transceiver, further comprising a memory to store a transceiver parameter, wherein the memory is accessible by the transceiver and the processor, wherein the transmit power or the receive sensitivity of the transceiver depend on the stored transceiver parameter, and wherein the processor is configured to adjust the transceiver parameter upon receipt of a configuration message from the radio beacon to a level indicated in the configuration message. - View Dependent Claims (17)
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Specification