A method for controlling an overload of a digital mobile communication
system. The digital mobile communication system has a base transceiver
station and a base station controller each of which has a database. The
method for controlling the overload includes the steps of: a)
initializing threshold values stored on the database as a predetermined
value; b) monitoring each of utility rates of a control processor
resource and a call resource; c) comparing the utility rates of the
control processor resource and the call resource with the threshold
values respectively, thereby obtaining overload grades of the control
processor resource and the call resource; d) comparing the overload grade
of the control processor resource with the overload grade of the call
resource, thereby selecting one of the control processor resource and the
call resource as a resource to be controlled, which has a higher overload
grade; e) determining whether an overload occurs in the resource to be
controlled; and f) if the overload occurs in the resource to be
controlled, informing a base station manager of an occurrence in the
resource to be controlled.