Apparatus for controlling signal-transmission power, mobile station, method of controlling signal-transmission power, and program

A signal-transmission power controlling apparatus for controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, comprising:

• a reduction-calculator for calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controller for controlling said maximum signal-transmission power in accordance with said reduction calculated by said reduction-calculator,
• wherein said reduction-calculator calculates said reduction in accordance with an equation:
• Reduction=Y×(20×log10(C))X
• where C indicates said peak index, and each of X and Y indicates said coefficient.

A mobile station, comprising:

• a signal-transmission power controlling apparatus for controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, including:
• a reduction-calculator for calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controller for controlling said maximum signal-transmission power in accordance with said reduction calculated by said reduction-calculator;
• wherein said reduction-calculator includes a peak-index calculator which selects, as an average power indication, a square root of a sum of squares of each of said value to determine an amplitude, and, as a peak power indication, a square root of a sum of (a) square of a sum of gain factors of channels assigned to I-phase among said gain factors, and (b) square of a sum of gain factors of channels assigned to Q-phase among said factors, and calculates, as said peak index, a ratio between said peak power indication and said average power indication.

A mobile station, comprising:

• including a signal-transmission power controlling apparatus for controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, comprising:
• a reduction-calculator for calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controller for controlling said maximum signal-transmission power in accordance with said reduction calculated by said reduction-calculator,
• wherein said reduction-calculator calculates said reduction in accordance with an equation:
• Reduction=Y×(20×log10(C))X
• where C indicates said peak index, and each of X and Y indicates said coefficient.

A method of controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, comprising:

• a reduction-calculating step of calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controlling step of controlling said maximum signal-transmission power in accordance with said reduction calculated in said reduction-calculating step;
• wherein said reduction-calculating step includes a step of selecting, as an average power indication, a square root of a sum of squares of each of said value to determine an amplitude, and, as a peak power indication, a square root of a sum of (a) square of a sum of gain factors of channels assigned to I-phase among said gain factors, and (b) square of a sum of gain factors of channels assigned to Q-phase among said factors, and calculating, as said peak index, a ratio between said peak power indication and said average power indication.

A method of controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, comprising:

• a reduction-calculating step of calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controlling step of controlling said maximum signal-transmission power in accordance with said reduction calculated in said reduction-calculating step;
• wherein said reduction-calculating step includes a step of calculating said reduction in accordance with an equation:
• Reduction=Y×(20×log10(C))X
• where C indicates said peak index, and each of X and Y indicates said coefficient.

A non-transitory computer-readable storage medium storing therein a program for causing a computer to carry out a method of controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, steps executed by said computer in accordance with said program, including:

• a reduction-calculating step of calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controlling step of controlling said maximum signal-transmission power in accordance with said reduction calculated in said reduction-calculating step;
• wherein said reduction-calculating step includes a step of selecting, as an average power indication, a square root of a sum of squares of each of said value to determine an amplitude, and, as a peak power indication, a square root of a sum of (a) square of a sum of gain factors of channels assigned to I-phase among said gain factors, and (b) square of a sum of gain factors of channels assigned to Q-phase among said factors, and calculating, as said peak index, a ratio between said peak power indication and said average power indication.

A non-transitory computer-readable storage medium storing therein a program for causing a computer to carry out a method of controlling maximum signal-transmission power among power for transmitting a plurality of signals multiplexed with one another, steps executed by said computer in accordance with said program, including:

• a reduction-calculating step of calculating a reduction in said maximum signal-transmission power in accordance with a peak index and a coefficient, said peak index being calculated based on a value to determine an amplitude of each of said signals, said peak index providing an indication of a ratio between peak power and average power in a signal to be transmitted, said coefficient being predetermined in accordance with a combination of said the value to determine an amplitude;
• and
• a controlling step of controlling said maximum signal-transmission power in accordance with said reduction calculated in said reduction-calculating step;
• wherein said reduction-calculating step includes a step of calculating said reduction in accordance with an equation:
• Reduction=Y×(20×log10(C))X
• where C indicates said peak index, and each of X and Y indicates said coefficient.