Apparatus and method of controlling forward link power when in discontinuous transmission mode in a mobile communication system

A method of controlling forward link transmission power in a mobile communication system capable of discontinuous transmission mode, where a terminal generates a power control command for controlling the forward link transmission power, the method comprising:

• a first step of determining whether an energy of power control bits of a received frame is more than a first threshold value, said first threshold value determined as a minimum value for receiving data;
• a second step of determining that a channel state is good if the first step determines that the energy of the power control bits is more than the first threshold value;
• a third step of determining that the channel state is bad if the first step determines that the energy of the power control bits is less than the first threshold value;
• a fourth step of determining whether data decoded prior to the first step has been correctly decoded if the received frame includes cyclic redundancy check (CRC) information;
• a fifth step of determining that the frame is good if it is determined that the data has been correctly decoded at the fourth step, or performing the first step if it is determined that the data has not been correctly decoded;
• a sixth step of determining, if it is determined that the channel state is good, that the frame has no data if a divided value is less than a predetermined second threshold value, said divided value obtained by dividing an energy value of non-power control bits by an energy value of power control bits;
• and
• a seventh step of determining that the frame is bad if the divided value is more than the predetermined second threshold value.