report and obtain responsive to the allocated uplink resources a configured maximum output power for an activated serving cell configured with an uplink carrier where the activated serving cell has non adaptive retransmission of uplink data or the activated serving cell where the base station schedules channel state information but no allocated uplink grant for transmitting data of an uplink shared channel application_number US 201514945813 A description various embodiments of the present invention are described as follows with reference to the drawings these embodiments are illustrative only and are not intended to limit the present invention for easy understanding of the principle and embodiments of the present invention by those skilled in the art the embodiments of the present invention shall be described taking configured maximum output power reporting of an lte a system as an example however it should be understood that the present invention is not limited thereto and is applicable to any other systems related to configured maximum output power reporting currently when user equipment triggers a power headroom report and a base station allocates to the user equipment an uplink grant for transmitting new data and the uplink grant is capable of containing the power headroom report phr the user equipment reports the configured maximum output power used in calculating the power headroom ph if for each activated serving.