Method and apparatus for controlling uplink power in wireless

An apparatus for controlling uplink (UL) transmission power in wireless communication system, the apparatus comprising:

• a radio frequency (RF) unit for transmitting and receiving a radio signal, wherein the radio signal includes information on transmission power which indicates a power control mode;
• and
• a processor operatively coupled to the RF unit, wherein the processor is configured for transmitting signals via the RF unit based on a scheduling for UL and/or downlink (DL),
• wherein the processor determines whether primary cell (PCell) and secondary cell (SCell) are asynchronous or synchronous, and determines maximum transmission power for SCell, using the information on transmission power, based on whether the PCell and the SCell are asynchronous or synchronous;
• and
• wherein the RF unit transmits radio signal to the SCell based on the maximum transmission power for the SCell.