Transmission power control method and device

A transmission electric power control method of controlling a maximum transmission electric power during transmission of a plurality of signals in a code-multiplexing fashion,

• wherein code multiplexing is used to transmit signals from a first transmission channel to transmit data, a second transmission channel to transmit main control information, and a third transmission channel to transmit additional control information, said method comprising the steps of:
• checking whether or not transmission data is available;
• when no transmission data is available, using first, second, and third gain factors to weight signals from said first, second, and third transmission channels and decreasing a maximum transmission electric power at a plurality of levels based on a ratio between said second and third gain factors;
• and
• when transmission data is available, decreasing a maximum transmission electric power at a plurality of levels based on said second gain factor and a ratio between said second and third gain factors.

A transmission electric power control method of controlling a maximum transmission electric power during transmission of a plurality of signals in a code-multiplexing fashion,

• wherein code multiplexing is used to transmit signals from a first transmission channel to transmit data, a second transmission channel to transmit main control information, and a third transmission channel to transmit additional control information, said method comprising the steps of:
• checking a requested transmission electric power;
• and
• when a requested transmission electric power is greater than or equal to a threshold value close to a maximum transmission electric power, clipping a transmission signal using a base band at a plurality of levels in accordance with magnitude of a requested transmission electric power.

A transmission electric power control apparatus for controlling a maximum transmission electric power during transmission of a plurality of signals in a code-multiplexing fashion, said apparatus comprising:

• first spreading means for providing a first spreading process to signals from a first transmission channel to transmit data, a second transmission channel to transmit main control information, and a third transmission channel to transmit additional control information;
• weighting means for weighting signals from said first, second, and third transmission channels after said first spreading process with first, second, and third gain factors, respectively;
• complex mapping means for complex-mapping said weighted signals from channels;
• second spreading means for providing a second spreading process to output from said complex mapping means;
• a filter for limiting a band for output from said second spreading means;
• digital-analog conversion means for converting output from said filter into an analog signal;
• modulation means for providing a specified modulation process to output from said digital-analog conversion means;
• automatic gain control means for controlling an amplification gain with respect to output from said modulation means;
• electric power amplification means for electrically amplifying output from said automatic gain control means;
• and
• main control means for using when first, second, and third gain factors to weight signals from said first, second, and third transmission channels and decreasing a maximum transmission electric power at a plurality of levels based on a ratio between said first and second gain factors and a ratio between said second and third gain factors.

A transmission electric power control apparatus for controlling a maximum transmission electric power during transmission of a plurality of signals in a code-multiplexing fashion, said apparatus comprising:

• first spreading means for providing a first spreading process to signals from a first transmission channel to transmit data, a second transmission channel to transmit main control information, and a third transmission channel to transmit additional control information;
• weighting means for weighting signals from said first, second, and third transmission channels after said first spreading process with first, second, and third gain factors, respectively;
• complex mapping means for complex-mapping said weighted signals from channels;
• second spreading means for providing a second spreading process to output from said complex mapping means;
• a filter for limiting a band for output from said second spreading means;
• digital-analog conversion means for converting output from said filter into an analog signal;
• modulation means for providing a specified modulation process to output from said digital-analog conversion means;
• automatic gain control means for controlling an amplification gain with respect to output from said modulation means;
• electric power amplification means for electrically amplifying output from said automatic gain control means;
• and
• main control means for checking availability of transmission data for transmission of signals from said first, second, and third transmission channels, decreasing a maximum transmission electric power at a plurality of levels based on a ratio between said second and third gain factors when no transmission data is available, and decreasing a maximum transmission electric power at a plurality of levels based on said second gain factor and a ratio between said second and third gain factors when transmission data is available.

A transmission electric power control apparatus for controlling a maximum transmission electric power during transmission of a plurality of signals in a code-multiplexing fashion, said apparatus comprising:

• first spreading means for providing a first spreading process to signals from a first transmission channel to transmit data, a second transmission channel to transmit main control information, and a third transmission channel to transmit additional control information;
• weighting means for weighting signals from said first, second, and third transmission channels after said first spreading process with first, second, and third gain factors, respectively;
• complex mapping means for complex-mapping said weighted signals from channels;
• clipping means for clipping output from said complex mapping means to a specified level;
• second spreading means for providing a second spreading process to output from said clipping means;
• a filter for limiting a band for output from said second spreading means;
• digital-analog conversion means for converting output from said filter into an analog signal;
• modulation means for providing a specified modulation process to output from said digital-analog conversion means;
• automatic gain control means for controlling an amplification gain with respect to output from said modulation means;
• electric power amplification means for electrically amplifying output from said automatic gain control means;
• and
• main control means for controlling said clipping means so as to clip output from said complex mapping means complex mapping means at a plurality of levels according to magnitude of a requested transmission electric power when said power is greater than or equal to a threshold value close to a maximum transmission electric power.