Communication repeater system and method

A communication repeater system comprising:

• a plurality of radio frequency units which correspond to base station systems and convert a radio signal from the corresponding base station systems into a digital signal and transmit the digital signal, the base station systems having mutually independent reference clocks for a transmission and reception switching timing at which transmission and reception of an uplink signal and a downlink signal are switched by time division,
• a plurality of slave station devices, and
• a master station device that receives the digital signal from the radio frequency units and establishes communication with a mobile communication terminal device via the slave station devices, the communication repeater system that repeats communication between the mobile communication terminal device and each of the base station systems via the slave station devices, wherein
• at least one of the radio frequency units, the master station device, and the slave station devices includes:
• a learning-signal input port, and
• first processor configured to generate a reference transmission and reception switching timing signal based on a learning signal input to the learning-signal input port, and set the reference transmission and reception switching timing signal as a reference transmission and reception switching timing;
• and
• the rest of the radio frequency units, the master station device, and the slave station devices each includes a second processor configured to correct a variation in the transmission and reception switching timing in accordance with the reference transmission and reception switching timing.