Network Synchronizer and Its Method in Asymmetric Multimedia Satellite Communication System

摘要

The present invention relates to a network synchronizer and a method thereof in an asymmetric multimedia satellite communication system, and broadcasts network synchronizer information to all terminal stations using an adaptive field syntax defined in the MPEG-2 system standard. In order to continuously maintain network synchronization between the central station and the terminal by using the network clock information inserted in the program clock reference value of the adaptive field syntax and the original program clock reference value region, the network synchronization information is included in the adaptive field syntax. Configure a packet for a network synchronizer, multiplex and broadcast the packet for the network synchronizer, extract the network synchronizer information from the received network synchronizer packet at a receiving unit and a terminal station of a central station, and generate a reference timing signal using the network synchronizer information; And a receiving slot at the receiving unit of the central station using the reference timing signal. Generating a timing signal, and generates a transmission slot timing signal in the terminal station. When the terminal station transmits data in synchronization with the transmission slot timing signal, a timing error between the reception slot timing signal and the slot timing signal of the received data is measured and transmitted to the corresponding terminal station. In step S, the transmission slot timing generation time is corrected to generate a transmission slot timing signal.