Method for determining transmission power for uplink signal and a user equipment performing the method

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

• a transceiver;
• and
• a processor operatively connected to the transceiver, the processor is configured to:
• determine a total transmission power for Evolved Universal Terrestrial Radio Access (E-UTRA) uplink signal and New Radio access (NR) uplink signal, when the E-UTRA uplink signal and the NR uplink signal overlap in time,
• wherein the total transmission power satisfies a condition including on PCMAX_L and PCMAX_H,
• wherein the PCMAX_L is a lower limit for the total transmission power and the PCMAX_H is a higher limit for the total transmission power,
• wherein when the E-UTRA uplink signal is transmitted on a scheduling unit p, when the NR uplink signal is transmitted on a scheduling unit q, the scheduling unit p is taken as a reference for the determination,
• wherein the PCMAX_L is determined based on scheduling unit pairs which include a scheduling pair (p,q), a scheduling pair (p,q+1), up to a scheduling pair (p,q+n),
• wherein the PCMAX_H is determined based on scheduling unit pairs which include a scheduling pair (p,q), a scheduling pair (p,q+1), up to a scheduling pair (p,q+n), and
• wherein q+n is related with a last scheduling unit q+n of the NR uplink signal which overlaps with the scheduling unit p of the E-UTRA uplink signal;
• and
• control the transceiver to transmit the E-UTRA uplink signal and the NR uplink signal based on the determined total transmission power.