Controlling timing of synchronization updates
First Claim
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1. A basestation, for use in a mobile communications network, the basestation comprising:
- a frequency synthesizer, for generating signals at desired frequencies;
a packet data interface, for transmitting and receiving packet data signals over a wide area network;
wherein the basestation is configured to determine an elapsed time since it last synchronized the frequency synthesizer to a master device;
wherein the basestation is configured to request synchronization packet data signals from the master device when the elapsed time exceeds a predetermined hold-over period;
wherein, when the elapsed time does not exceed the predetermined hold-over period, the basestation is configured to determine whether temperature conditions at the basestation meet a predetermined temperature condition threshold, and to determine whether a resynchronization is required for the frequency synthesizer to remain in synchronization;
wherein the basestation is configured to request synchronization packet data signals from the master device when said temperature condition threshold is met;
wherein the basestation is configured to synchronize the frequency synthesizer to the master device on receipt of the synchronization packet data signals from the master device; and
wherein the basestation is configured to request the master device to stop sending synchronization packet data signals to synchronize the frequency synthesizer to the master device.
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Abstract
A base station for use in a mobile communications network includes a frequency synthesizer for generating signals at desired frequencies and a packet data interface for transmitting and receiving packet data signals over a wide area network. The basestation is configured to determine an elapsed time since it last synchronized the frequency synthesizer to a master device. The basestation is also configured to request synchronization packet data signals from the master device when the elapsed time exceeds a predetermined holdover period.
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Citations
20 Claims
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1. A basestation, for use in a mobile communications network, the basestation comprising:
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a frequency synthesizer, for generating signals at desired frequencies; a packet data interface, for transmitting and receiving packet data signals over a wide area network; wherein the basestation is configured to determine an elapsed time since it last synchronized the frequency synthesizer to a master device; wherein the basestation is configured to request synchronization packet data signals from the master device when the elapsed time exceeds a predetermined hold-over period; wherein, when the elapsed time does not exceed the predetermined hold-over period, the basestation is configured to determine whether temperature conditions at the basestation meet a predetermined temperature condition threshold, and to determine whether a resynchronization is required for the frequency synthesizer to remain in synchronization; wherein the basestation is configured to request synchronization packet data signals from the master device when said temperature condition threshold is met; wherein the basestation is configured to synchronize the frequency synthesizer to the master device on receipt of the synchronization packet data signals from the master device; and wherein the basestation is configured to request the master device to stop sending synchronization packet data signals to synchronize the frequency synthesizer to the master device. - View Dependent Claims (2, 3, 4, 5)
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6. A method of synchronizing a crystal oscillator, the method comprising, at first time intervals:
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receiving synchronization data from a synchronization master device; the method further comprising, when synchronization data is received, measuring a time elapsed since the crystal oscillator was last synchronized; calculating and storing a first frequency offset of the crystal oscillator, the first frequency offset comprising a difference between a frequency generated by the crystal oscillator and a frequency derived from the synchronization data, and the method further comprising; measuring a temperature of the crystal oscillator; determining a second frequency offset based on at least one previously stored frequency offset obtained at a similar elapsed time and measured temperature; and upon receipt of the synchronization data from the synchronization master device, applying a compensation value to the crystal oscillator based on said determined second frequency offset to synchronize the crystal oscillator to the synchronization master device. - View Dependent Claims (7, 8)
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9. A method of synchronizing a basestation, the method comprising:
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at the basestation, transmitting and receiving packet data signals over a wide area network; generating signals at desired frequencies using a frequency synthesizer; determining an elapsed time since the basestation last synchronized the frequency synthesizer to a master device; when the elapsed time does not exceed a predetermined hold-over period, determining whether temperature conditions at the basestation meet a predetermined temperature condition threshold and determining whether a resynchronization is required for the frequency synthesizer to remain in synchronization; requesting synchronization packet data signals from the master device when said temperature condition threshold is met; requesting synchronization packet data signals from the master device when the elapsed time exceeds the predetermined hold-over period; requesting a specified number of synchronization data packets from the master device; synchronizing the frequency synthesizer to the master device on receipt of the synchronization packet data signals from the master device; and requesting the master device to stop sending synchronization packet data signals to synchronize the frequency synthesizer to the master device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A basestation for use in a mobile communications network, the basestation comprising:
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a frequency synthesizer, for generating signals at desired frequencies; a packet data interface, for transmitting and receiving packet data signals over a wide area network, wherein the basestation is configured to determine an elapsed time since it last synchronized the frequency synthesizer to a master device; wherein the basestation is configured to request synchronization packet data signals from the master device when the elapsed time exceeds a predetermined hold-over period; wherein, when the elapsed time does not exceed the predetermined hold-over period, the basestation is configured to determine whether temperature conditions at the basestation meet a predetermined temperature condition threshold and to determine whether a resynchronization is required for the frequency synthesizer to remain in synchronization; wherein the basestation is configured to request synchronization packet data signals from the master device when said temperature condition threshold is met; and wherein the basestation is configured to request a specified number of synchronization data packets from the master device. - View Dependent Claims (17, 18, 19, 20)
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Specification