And device synchronization method of the device of the base station sub-system of the ATM-based which uses the virtual channel connection of special

摘要

A method and apparatus for synchronizing devices in ATM based base station subsystems using special ATM virtual channel connections is disclosed. The invention provides a high, constant bit rate connection to the BTSs via the ATM cloud that is primarily for synchronization. The method in accordance with the invention includes establishing a high, constant bit rate virtual channel connection to each of the plurality of remote devices from the transmitting device and broadcasting data cells to the plurality of remote devices for processing by the plurality of remote devices to deduce a clock frequency for synchronization thereto. The remote devices comprise base transceiver stations (BTS). The transmitting device (1210) is an interworking function device, which may be a transcoder. The method enables clock synchronization by providing a synchronous residual timestamp, through analysis to deduce the arrival time of the data cells, and by determining an available capacity of the buffer and adjusting the clocks of the plurality of remote devices in response to the available capacity of the buffer.