Method and device for efficient communication in next generation mobile communication system

A terminal comprising:

• a transceiver;
• and
• a controller configured to:
• receive, from a base station via the transceiver, a radio resource control (RRC) message for an RRC connection,
• identify whether the RRC message includes information associated with a pathloss reference,
• identify a pathloss based on the information associated with the pathloss reference, in case that the RRC message includes the information associated with the pathloss reference,
• identify the pathloss based on a currently used synchronization signal (SS) block, in case that the RRC message does not include the information associated with the pathloss reference,
• obtain a power headroom (PH) based on the identified pathloss, and
• transmit, to the base station via the transceiver, a power headroom report (PHR) including the obtained PH.

A method performed by a base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, a radio resource control (RRC) message for an RRC connection;
• receiving, from the terminal, a power headroom report (PHR) including a power headroom (PH);
• and
• identifying the PH of the terminal based on the PHR,
• wherein the PH is based on a pathloss,
• wherein the pathloss is based on information associated with a pathloss reference, in case that the information associated with the pathloss reference is included in the RRC message, and
• wherein the pathloss is based on a currently used synchronization signal (SS) block, in case that the information associated with the pathloss reference is not included in the RRC message.

A base station comprising:

• a transceiver;
• and
• a controller configured to:
• transmit, to a terminal via the transceiver, a radio resource control (RRC) message for an RRC connection,
• receive, from the terminal via the transceiver, a power headroom report (PHR) including a power headroom (PH), and
• identify the PH of the terminal based on the PHR,
• wherein the PH is based on a pathloss,
• wherein the pathloss is based on information associated with a pathloss reference, in case that the information associated with the pathloss reference is included in the RRC message, and
• wherein the pathloss is based on a currently used synchronization signal (SS) block, in case that the information associated with the pathloss reference is not included in the RRC message.