Abstract: The disclosure concerns an inter-base station frame synchronization system for use in a mobile communication system having at least one master base station and a plurality of slave base stations. The master base station is arranged to transmit a control channel signal to the slave base stations located around the master base station in synchronization with a reference frame timing. The slave base stations set a control channel signal observation period. The slave base stations are arranged to generate frame timing based on timings of a received control channel signal from the master base station or other slave base stations when the received control channel signal is received during the control channel signal observation period.

Abstract: An inter-base station frame synchronization system for use in a mobile communication system includes at least one master base station and a plurality of slave base stations. The master base station is provided with time information receiving means for receiving time information with high precision externally supplied, reference frame timing generation means for generating a reference frame timing on the basis of the time information, and first control channel signal transmission means for transmitting a control channel signal to the slave base stations in synchronism with the reference frame timing.