Transmission power control method and device

摘要

Disclosed is a method and an apparatus for controlling transmission electric power capable of minimizing a decrease in the amount of maximum transmission electric power without degrading an adjacent channel leakage power ratio when code-multiplexing additional control information with data and main control information. A mobile device checks values of gain factors betad and betac when performing code multiplexing to transmit signals from channels DPDCH to transmit data, DPCCH to transmit main control information, and HS-DPCCH to transmit additional control information. A maximum transmission electric power is decreased at a plurality of levels based on the check result and a ratio (Deltahs) between the gain factors betac and betahs. It may be preferable to check the presence or absence of transmission data instead of the gain factor betad. In this case, when no transmission data is available, the maximum transmission electric power is decreased at a plurality of levels based on Deltahs. When transmission data is available, the maximum transmission electric power is decreased at a plurality of levels based on the gain factor betac and Deltahs.