Power headroom report method and apparatus of UE

A terminal for reporting a power headroom (PH) in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• transmit a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell;
• determine whether a second uplink resource is allocated to the serving cell;
• identify whether power backoff due to power management has changed more than a threshold since a transmission of the first PHR, in case that the second uplink resource is allocated to the serving cell;
• and
• transmit, to a base station, a second PHR based on the second uplink resource, in case that the power backoff due to the power management has changed more than the threshold since the transmission of the first PHR,
• wherein the second PHR is transmitted based on a first type PHR of the first type PHR and a second type PHR, and
• wherein the first type PHR includes the PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

A method for receiving a power headroom (PH) by a base station in a wireless communication system, the method comprising:

• receiving, from a terminal, a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell;
• and
• receiving, from the terminal, a second PHR based on a second uplink resource allocated to the serving cell, in case that power backoff due to power management of the terminal has changed more than a threshold since the transmission of the first PHR,
• wherein it is identified by the terminal whether the power backoff due to the power management has changed more than the threshold since the transmission of the first PHR,
• wherein the second PHR is received based on a first type PHR of the first type PHR and a second type PHR, and
• wherein the first type PHR includes the PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.

A base station for receiving a power headroom (PH) in a wireless communication system, the base station comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to control to:
• receive, from a terminal, a first power headroom report (PHR) based on a first uplink resource allocated to a serving cell, and
• receive, from the terminal, a second PHR based on a second uplink resource allocated to the serving cell, in case that power backoff due to power management of the terminal has changed more than a threshold since the transmission of the first PHR,
• wherein it is identified by the terminal whether the power backoff due to the power management has changed more than the threshold since the transmission of the first PHR,
• wherein the second PHR is received based on a first type PHR of the first type PHR and a second type PHR, and
• wherein the first type PHR includes the PH for each of at least one serving cell and bitmap information indicating a serving cell for which the PH is to be reported.