A transmission power control apparatus is adapted to control a reference
value for controlling a transmission power of a mobile terminal equipment
based on a reception quality of a plurality of radio access bearers at a
base station apparatus, with respect to a physical channel to which the
plurality of radio access bearers are mapped, when making a radio
connection between the mobile terminal equipment and the base station
apparatus in a mobile communication system. The transmission power
control apparatus includes a judging part configured to judge whether or
not a radio access bearer that is a monitoring target of the reception
quality is an audio transmission radio access bearer in a silent state,
based on multiplexed information; and a switching part configured to
switch the radio access bearer that is the monitoring target of the
reception quality to a radio access bearer other than the audio
transmission radio access bearer in the silent state, if the judging part
judges that the radio access bearer than is the monitoring target of the
reception quality is the audio transmission radio access bearer in the
silent state. The reference value for controlling the transmission power
of the mobile terminal equipment is controlled based on a reception
quality of the radio access bearer other than the audio transmission
radio access bearer in the silent state.