Method for power headroom reporting and device therefor

A user equipment (UE) operating in a wireless communication system, the UE comprising:

• a transmitter;
• a receiver;
• and
• a processor configured to control the transmitter and the receiver,
• wherein the processor is configured to:
• generate a PHR MAC CE (Power Headroom Reporting MAC Control Element) including a plurality of types of PH (Power Headroom) information for a primary cell (PCell) and one or more secondary cells(SCells);
• and
• transmit a power headroom reporting through the generated PHR MAC CE to a network,
• wherein the PHR MAC CE includes a Type 2 PH information for the PCell or a SCell among the one or more SCells followed by another type of PH information for the PCell other than the Type 2 PH information, and the another type of PH information for the PCell followed by another type of PH information for the one or more SCells other than the Type 2 PH information based on information indicating a presence of a PH field for the one or more SCells.