| 摘要 |
Disclosed are a control signal transmitting method and mobile terminal device capable of switching between a plurality of terminal communication modes having different maximum transmissible power values with a high degree of precision, while suppressing increases in signaling overhead. In a mobile station (100), a PHR transmission evaluating unit (115) sends, to a base station (200), power head room (PHR) information for the SC-FDMA mode or the OFDMA mode during a reporting period, and a maximum transmission power information setting unit (101) provides notification to the base station (200) of difference information between the transmission modes prior to the beginning of the reporting period. An increase in signaling overhead can be prevented because only a single set of PHR information among the information for the plurality of terminal transmission modes is reported in this way. Providing notification of difference information between the transmission modes enables the base station (200) to calculate the PHR of each of the terminal transmission modes without receiving PHR information for all of the terminal transmission modes. This therefore enables highly accurate switching among the terminal transmission modes with appropriate timing.
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