Patent ID: 8553619
Filing Date: 2013-10-08
Classification: H04H,H04L,H04N,H04W

Abstract:
1. A method of time synchronisation between a control centre and a plurality of transmitters in a single frequency network, comprising the steps of: at least one of generating, by one or more signal generators, and receiving, by the control centre, a first reference time signal with a high time and frequency accuracy in a short and long time horizon and a second reference time signal supplied to the control centre with a low time and frequency accuracy in the short time horizon and a high time and frequency accuracy in the long time horizon; generating a transport data stream to be supplied to the plurality of transmitters with a time-variable data rate through the control centre corresponding to a frequency of the second reference time signal, wherein data packets containing a transmission time of a data packet referenced to the first reference time signal in the transmitters are distributed within the transport data stream, and wherein a time accuracy of a transmission time of the respective data packet is optimised by time averaging of the time and frequency accuracy of the second reference time signal, wherein the time averaging of the time and frequency accuracy of the second reference time signal is implemented by summing the transmitted data packets and weighting with a reference data rate corresponding to the frequency of the first reference time signal; and performing time displacement of the transport data stream received from the control centre by a respective one of the plurality of transmitters until the data packets of the transport data stream each containing a transmission time are transmitted, with regard to the first reference time signal supplied to the respective transmitter, at a correct transmission time.