Method and apparatus for synchronizing telecommunications devices via a transmission network
AssigneeNokia Corporation
InventorMikko Weckström
Life of this patent
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Abstract
For synchronous transmission between two telecommunications units, the devices must always be synchronized. Typically, a reference signal is required for synchronization. The reference signal can be transmitted from one unit to another embedded in the data signal. If the data is transmitted via a transmission network modulated in the way required by the network, the reference signal is not always received by the receiver together with the data signal. The problem is solved by this invention by converting the reference signal before its transmission into the transmission network for the frequency band used for transmission in the transmission network.
Claims11
A method for synchronizing first and second telecommunications devices via a transmission network, the method comprising the steps of:
- converting a reference signal into a frequency band used in the transmission network by mixing it with another signal;
- converting a payload signal into the frequency band used in the transmission network;
- combining the converted reference and payload signals;
- transmitting the combined signal from the first device to the second device via the transmission network;
- extracting the reference signal and reconverting it back to its original frequency;
- and
- synchronizing the second device with the first device using the reconverted reference signal.
An arrangement for synchronizing first and second telecommunications devices via a transmission system, wherein the first device includes first mixing means for converting a reference signal into a first frequency band used in the transmission network by mixing it with a first auxiliary signal, includes means for converting a payload signal into the first frequency band, and includes combining means for combining the converted payload and reference signals;
- and wherein:
- the first device includes transmission means for transmitting the combined converted payload and reference signals to the second device via the transmission network;
- and
- the second includes second mixing means for extracting and reconverting the converted reference signal from the combined signal back to its original frequency, wherein the second device is configured to synchronize with the first device on the basis of the reconverted reference signal.
Dependencies are inferred from the claim text.