Mobile communication system, base station apparatus, mobile station apparatus, transmission power control method and information recording medium

A base station apparatus configured to communicate with a plurality of mobile station apparatuses in a mobile communication system, wherein each of the mobile station apparatuses comprise a maximum power transmission information transmitting unit configured to transmit to the base station apparatus maximum power transmission information indicating that a communication signal is transmitted at the maximum transmission power of the mobile station apparatus, the base station comprising:

• a transmission power control unit configured to control a transmitting power of each of the mobile station apparatuses such that a reception power of a communication signal transmitted from each of the mobile station apparatuses and received by the base station apparatus is approximately equal to a target reception power;
• a reception power acquiring unit configured to acquire a reception power of the communication signal transmitted from each of the mobile station apparatuses;
• a maximum power transmission information receiver configured to receive the maximum power transmission information from each of the mobile station apparatuses;
• and
• a target reception power changer configured to change the target reception power to a maximum reception power of a communication signal received from a mobile station apparatus which has transmitted the communication signal at a maximum transmission power level, wherein the transmission power control unit sends an instruction to at least one mobile station apparatus to control the at least one mobile station apparatus such that a reception power of a communication signal transmitted by the at least one mobile station apparatus is approximately equal to the changed target reception power.