Patent ID: 6480483
Filing Date: 2002-11-12
Classification: H04B

Abstract:
An inter-base-station frame synchronous system in a mobile communication system comprising:plural base stations dispersively arranged within a service area and connected to a communication network, and having at least one master base station and plural slave base stations; and plural mobile stations wirelessly connected to said plural base stations by a time-division bi-directional multiplex system, wherein said master base station comprises: time information receiving means for receiving time information with high precision externally supplied; reference frame timing generating means for generating reference frame timing for a time-divisional multiplex connection at a predetermined time based on said time information; and first control channel signal transmitting means for transmitting a control channel signal to said plural slave base stations located around said master base station in synchronization with said reference frame timing, wherein said slave base stations comprise: control channel signal observation period setting means in which a predetermined time period is set as a control channel signal observation period starting from a first receiving time point of a control channel signal transmitted from said master base station or other slave base stations during a frame synchronization control period; slave base station frame timing generating means for generating slave base station frame timing on the basis of receiving timing of the control channel signal transmitted from said master base station or one of the other slave base stations when only this control channel signal is received during said control channel signal observation period, said slave base station frame timing generating means also generating said slave base station frame timing on the basis of one of receiving timings of control channel signals respectively transmitted from said master base station or plural slave base stations among the other slave base stations when these control channel signals are received during said control channel signal observation period; and second control channel signal transmitting means for transmitting each control channel signal in synchronization with said slave base station frame timing after said control channel signal observation period is terminated, wherein said slave base station frame timing generating means generates said slave base station frame timing in synchronization with a frame timing based on a most advanced phase among plural frame timings of the control channel signals respectively transmitted from the master base station or plural slave base stations among the other slave base stations when these control channel signals are received during the control channel signal observation period.