1. A method by a terminal in a mobile communication system, the method comprising:
generating a medium access control protocol data unit (MAC PDU) including a header and an extended power headroom report (PHR),
the header including a logical channel identifier (LCID) for identifying the extended PHR; and
transmitting the MAC PDU to a base station,
wherein the extended PHR includes one or more power headrooms (PHs) and a bitmap, the bitmap indicating whether at least one
PH for at least one secondary cell is reported.