Patent ID: 6501743
Filing Date: 2002-12-31
Classification: H04B

Abstract:
An apparatus for network synchronization in an asymmetric two-way satellite communication system comprising a central station and a plurality of remote stations:wherein said central station includes a transmission part and a reception part, said transmission part comprising: means for generating network synchronization information, transmission stream generation means for receiving said network synchronization information and generating a network synchronization packet containing said network synchronization information in an adaptation field structure, and transmission means for multiplexing, modulating and broadcasting said network synchronization packet and a transmission stream; and said reception part comprising: reception processing means for extracting network synchronization information from the received transmission stream and generating a reference timing signal, reception slot timing generation means for receiving said reference timing signal and generating reception slot timing, and synchronous burst reception means for receiving said reception slot timing, measuring reception timing error, and supplying said reception timing error to said transmission stream generation means, and wherein each remote station comprises reception processing means for extracting network synchronization information from the received transmission stream and generating a reference timing signal; means for generating transmission slot timing on the basis of said reference timing signal and adjusting transmission slot timing generation time on the basis of the reception timing error received from said central station; and means for transmitting burst in synchronous with said transmission slot timing, wherein said network synchronization information generation means latches an output value of a counter in accordance with the periodic network synchronous information latch signal supplied from said transmission stream generation means, and comprises means for generating reference clocks, a first counting means for supplying a value counted according to said reference clocks and means for latching the output value of said first counter in accordance with latch signal information supplied from said transmission stream generation means.