Transmission power control method, mobile terminal apparatus and radio base station apparatus

A mobile terminal apparatus that performs radio communications in a system band including a plurality of component carriers, comprising:

• a transmission power control command reception section configured to receive a transmission power control command that is associated with a predetermined component carrier and is generated in a radio base station apparatus;
• and
• a transmission power setting section configured to apply the transmission power control command received in the transmission power control command reception section to at least a particular component carrier group in common, and sets transmission power of each component carrier based on offset information for compensating for a reception quality difference between the plurality of component carriers measured in the radio base station apparatus,
• wherein the particular component carrier group includes the predetermined component carrier and a component carrier whose frequency characteristics are different from those of the predetermined component carrier.

A radio base station apparatus comprising:

• a common component carrier setting section configured to set a particular component carrier group to apply a transmission power control command in common among a plurality of component carriers, for a mobile terminal apparatus that performs radio communications in a system band including the plurality of component carriers, to notify the mobile terminal apparatus;
• a target reception power generating section configured to measure a reception quality difference in each component carrier in at least the particular component carrier group, for the mobile terminal apparatus that performs radio communications in the system band including the plurality of component carriers, and generates target reception power specific to each component carrier corresponding to the reception quality difference to notify the mobile terminal apparatus;
• and
• a transmission power control command generating section configured to generate transmission power control commands respectively associated with the plurality of component carriers to notify the mobile terminal apparatus,
• wherein the transmission power control command that is associated with a predetermined component carrier is used by the mobile terminal apparatus to set transmission power of each component carrier based on the target reception power, and
• the particular component carrier group includes the predetermined component carrier and a component carrier whose frequency characteristics are different from those of the predetermined component carrier.