A method of controlling power in communication system including a relay station, RS, and a base station, BS, the method comprising: selecting (S200) one of a first method of controlling power in the BS and a second method of controlling power in the RS; when the second method is selected, transmitting (S260), by the BS, a message related to power control to the RS; measuring (S270), by the RS, channel quality of an access uplink between a subscriber station, SS, and the RS; generating, by the RS, power control message for the access uplink based on the measured channel quality; and transmitting (S280), by the RS, the power control message to the SS; and when the first method is selected, measuring (S210), by the RS, channel quality of the access uplink between the SS and the RS; generating, by the RS, channel quality measurement information based on the measured channel quality; reporting (S220), by the RS, the channel quality measurement information to the BS or a superordinate RS; generating (S230), by the BS, power control message for the access uplink based on the channel quality measurement information; and transmitting (S240), by the BS, the power control message to the SS via the RS. selecting (S200) one of a first method of controlling power in the BS and a second method of controlling power in the RS; when the second method is selected, transmitting (S260), by the BS, a message related to power control to the RS; measuring (S270), by the RS, channel quality of an access uplink between a subscriber station, SS, and the RS; generating, by the RS, power control message for the access uplink based on the measured channel quality; and transmitting (S280), by the RS, the power control message to the SS; and when the first method is selected, measuring (S210), by the RS, channel quality of the access uplink between the SS and the RS; generating, by the RS, channel quality measurement information based on the measured channel quality; reporting (S220), by the RS, the channel quality measurement information to the BS or a superordinate RS; generating (S230), by the BS, power control message for the access uplink based on the channel quality measurement information; and transmitting (S240), by the BS, the power control message to the SS via the RS. transmitting (S260), by the BS, a message related to power control to the RS; measuring (S270), by the RS, channel quality of an access uplink between a subscriber station, SS, and the RS; generating, by the RS, power control message for the access uplink based on the measured channel quality; and transmitting (S280), by the RS, the power control message to the SS; and when the first method is selected, measuring (S210), by the RS, channel quality of the access uplink between the SS and the RS; generating, by the RS, channel quality measurement information based on the measured channel quality; reporting (S220), by the RS, the channel quality measurement information to the BS or a superordinate RS; generating (S230), by the BS, power control message for the access uplink based on the channel quality measurement information; and transmitting (S240), by the BS, the power control message to the SS via the RS. <EOS>