This invention relates to base station control equipment, radio base
station equipment and radio terminal equipment that together constitute a
mobile communication system. These base station control equipment, radio
base station equipment and radio terminal equipment of this invention
update transmitting power of a radio channel allotted to a new visit-zone
to a greater and suitable value in time sequence. Therefore, mobile
communication system according to the invention can keep speech quality
of a completed call and transmission quality at high levels, can improve
the number of radio channels that can be formed in parallel in a common
frequency band (system capacity) or an information content of information
that can be transmitted in parallel with desired transmission quality,
and can improve utilization efficiency of a radio frequency.