Patent ID: 8538474

Claim:
A method of adjusting transmission power of a communication system by an apparatus, the method comprising: obtaining transmission power configuration information, wherein the transmission power configuration information comprises a transmission power lower limit and a transmission power upper limit; obtaining modulation mode configuration information, wherein the modulation mode configuration information comprises a lower limit modulation mode and an upper limit modulation mode; obtaining current channel information; calculating, according to the current channel information, the transmission power configuration information and the modulation mode configuration information, to obtain first transmission power and a first modulation mode; controlling signal transmission according to the first transmission power and the first modulation mode; wherein the calculating according to the current channel information, the transmission power configuration information and the modulation mode configuration information to obtain the first transmission power and the first modulation mode comprises: calculating, according to the channel information and the upper limit modulation mode, to obtain second transmission power; using the second transmission power as the first transmission power and using the upper limit modulation mode as the first modulation mode if the second transmission power is between the transmission power lower limit and the transmission power upper limit; calculating, according to the transmission power upper limit and the channel information, to obtain a second modulation mode if the second transmission power is greater than the transmission power upper limit, wherein if the second modulation mode is less than the lower limit modulation mode, it indicates that communication may not be performed in a channel condition and the calculating fails; using the transmission power upper limit as the first transmission power and using the second modulation mode as the first modulation mode, if the second modulation mode is greater than or equal to the lower limit modulation mode; and using the transmission power lower limit as the first transmission power and using the upper limit modulation mode as the first modulation mode, if the second transmission power is less than the transmission power lower limit.