A power control method for use in a mobile communication system, the method comprising: receiving a data block through a downlink channel; first determining whether a wind-up power control process should be started or has been released; if the determining step is positive: - changing a down step size for adjusting a target quality of service, QoS, of the downlink channel to an up step size; and - fixing the target QoS of the downlink channel, wherein the target QoS indicates a target signal to interference ratio, SIR, of the downlink channel; if the determining step is negative: - calculating a Cyclic Redundancy Check, CRC, value of the received data block and determining whether the calculated CRC value is equal to zero; - if the determining step is negative: -- restoring the down step size to an original down step size before initiation of the wind-up power control process; and -- increasing the target QoS of the downlink channel using the up step size; - if the determining step is positive: -- decreasing, the target QoS according to a down step size being greater than the original down step size. receiving a data block through a downlink channel; first determining whether a wind-up power control process should be started or has been released; if the determining step is positive: - changing a down step size for adjusting a target quality of service, QoS, of the downlink channel to an up step size; and - fixing the target QoS of the downlink channel, wherein the target QoS indicates a target signal to interference ratio, SIR, of the downlink channel; - changing a down step size for adjusting a target quality of service, QoS, of the downlink channel to an up step size; and - fixing the target QoS of the downlink channel, wherein the target QoS indicates a target signal to interference ratio, SIR, of the downlink channel; if the determining step is negative: - calculating a Cyclic Redundancy Check, CRC, value of the received data block and determining whether the calculated CRC value is equal to zero; - if the determining step is negative: -- restoring the down step size to an original down step size before initiation of the wind-up power control process; and -- increasing the target QoS of the downlink channel using the up step size; - if the determining step is positive: -- decreasing, the target QoS according to a down step size being greater than the original down step size. - calculating a Cyclic Redundancy Check, CRC, value of the received data block and determining whether the calculated CRC value is equal to zero; - if the determining step is negative: -- restoring the down step size to an original down step size before initiation of the wind-up power control process; and -- increasing the target QoS of the downlink channel using the up step size; -- restoring the down step size to an original down step size before initiation of the wind-up power control process; and -- increasing the target QoS of the downlink channel using the up step size; - if the determining step is positive: -- decreasing, the target QoS according to a down step size being greater than the original down step size. -- decreasing, the target QoS according to a down step size being greater than the original down step size.