Uplink transmission power determination method and wireless device

A user equipment (UE) for determining an uplink transmission power, the UE comprising:

• a transceiver for transmitting and receiving a wireless signal;
• and
• a processor operatively connected to the transceiver, wherein the processor is configured to:
• determining a maximum power reduction (MPR) value based on whether 64 QAM (Quadrature Amplitude Modulation) is used for uplink data transmission, whether multi-clustered transmission is used for the uplink data transmission, and whether a single carrier is used for the uplink data transmission or a plurality of carriers using carrier aggregation (CA) is used for the uplink data transmission;
• determine the uplink transmission power based on the MPR value;
• control the transceiver to transmit uplink data based on the uplink transmission power,
• wherein based on that the 64 QAM, the multi-clustered transmission, and the single carrier are used for the uplink data transmission, a first MPR value is determined as the MPR value to be applied to the uplink data transmission,
• wherein based on that the 64 QAM, the multi-clustered transmission, and the plurality of carriers are used for the uplink data transmission, a second MPR value is determined as the MPR value to be applied to the uplink data transmission,
• wherein the first MPR value is determined based on CEIL {MA, 0.5},
• wherein, MA=10.0, ;
• 0<A≤0.1
• 11.75-17.5A, ;
• 0.1<A≤0.5
• 3.6-1.2A, ;
• 0.5<A≤1.0
• wherein A=NRB_alloc/NRB_agg, and
• wherein NRB_agg represents a number of RBs in a channel band, NRB_alloc represents a total number of RBs transmitted simultaneously, and CEIL {MA, 0.5} represents a function that rounds off MA on a per-0.5 dB basis.