Remote monitoring and calibration of system reference clock using network timing reference
First Claim
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1. A method of calibrating a local radio reference clock for a radio operating in a radio network, the radio network having a main unit with a network reference clock, comprising the steps of:
- determining an alarm condition triggered when a frequency of the local radio reference clock is different from a predetermined setpoint by more than a prescribed amount;
transmitting the alarm condition to the main unit;
determining a frequency offset between the local clock and the network reference clock, based in part on the determination of the alarm condition;
placing the local clock in a calibration mode; and
calibrating the local clock by reducing sufficiently slowly the frequency offset between the local clock and the network reference clock to enable continued radio communication with a node during calibration.
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Abstract
A systematic and method for calibrating a local radio reference clock for a radio operating in a radio network having a network reference clock. The method comprises determining at the radio an offset between the local clock and the network clock, placing the local clock in a calibration mode, and calibrating the local clock using a radio link to reduce the offset.
49 Citations
17 Claims
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1. A method of calibrating a local radio reference clock for a radio operating in a radio network, the radio network having a main unit with a network reference clock, comprising the steps of:
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determining an alarm condition triggered when a frequency of the local radio reference clock is different from a predetermined setpoint by more than a prescribed amount; transmitting the alarm condition to the main unit; determining a frequency offset between the local clock and the network reference clock, based in part on the determination of the alarm condition; placing the local clock in a calibration mode; and calibrating the local clock by reducing sufficiently slowly the frequency offset between the local clock and the network reference clock to enable continued radio communication with a node during calibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio network comprising:
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a local reference clock in a radio; a network reference clock remote from the radio; a component configured to determine an alarm condition triggered when a frequency of the local radio reference clock is different from a predetermined setpoint by more than a prescribed amount and to determine a frequency offset between the local clock and the network reference clock, based in part on the determination of the alarm condition; a transceiver configured to transmit the alarm condition to a main unit; a command unit for generating a command to place the radio in a calibration mode; and a calibration unit for calibrating the local reference clock during the calibration mode by reducing the frequency offset sufficiently gradually to enable continued radio communication with a node during calibration.
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Specification