A method for controlling transmit power in a wireless communication system are disclosed. The method comprises determining a first transmit power of at least a first type of subframe which is higher than a maximum allowed average output power of the radio base station, and a second transmit power of at least a second type of subframe which is lower than the maximum allowed average output power. An average transmit power by which the radio base station transmitted an amount of subframes during a preceding time period is determined. Moreover, a maximum allowed power for a subsequent subframe based on the determined average transmit power and the maximum allowed average output power is determined. Finally, at least one type of subframe to be allowed for the subsequent subframe based on the determined maximum allowed power for the subsequent subframe and at least the first and second transmit power is determined.