A radio network controller which includes radio resource administration
means for administrating a state of the use of radio resource, rack
information administration means for administrating a state of the use of
resource at base band signal processing unit in base transceiver station,
and control means for selecting a call frequency used in base transceiver
station and allocating it to a certain rack of base band signal
processing unit. In the above configuration, a percentage of loss calls
which occurred due to an insufficiency of empty amount with the radio
resource, or of empty amount with the base band resource, can be lowered.