Method and apparatus for controlling uplink transmission power by terminal for dual connectivity in wireless communication system

A first base station method for supporting dual connectivity for a terminal between the first base station based on a first radio access technology and a second base station based on a second radio access technology in a wireless communication system, the method comprising:

• transmitting, to the terminal, a downlink signal;
• and
• receiving, from the terminal, a first uplink signal corresponding to the downlink signal based on first transmission power,
• wherein, in case that a transmission timing of the first uplink signal overlaps a transmission timing of a second uplink signal which is transmitted from the terminal to the second base station, and a sum of the first transmission power and second transmission power which is used for the transmission of the second uplink signal exceeds a maximum transmission power of the terminal, second transmission power is controlled based on a processing time of the first uplink signal of the terminal.

A terminal for performing dual connectivity with a first base station based on a first radio access technology and a second base station based on a second radio access technology in a wireless communication system, the terminal comprising:

• a transceiver;
• and
• a controller configured to:
• control the transceiver to receive, from the first base station, a downlink signal;
• identify whether a first time resource for a transmission of a first uplink signal corresponding to the downlink signal overlaps a second time resource for a transmission of a second uplink signal which is transmitted to the second base station;
• identify whether a sum of first transmission power for the transmission of the first uplink signal and second transmission power for the transmission of the second uplink signal exceeds a maximum transmission power of the terminal, in case that the transmission timing of the first uplink signal overlaps the transmission timing of the second uplink signal;
• and
• control the second transmission power based on a processing time for the transmission of the first uplink signal, in case that the sum exceeds the maximum transmission power of the terminal.

A first base station for supporting dual connectivity for a terminal between the first base station based on a first radio access technology and a second base station based on a second radio access technology in a wireless communication system, the first base station comprising:

• a transceiver;
• and
• a controller configured to:
• control the transceiver to transmit, to the terminal, a downlink signal, and
• control the transceiver to receive, from the terminal, a first uplink signal corresponding to the downlink signal based on first transmission power,
• wherein, in case that a transmission timing of the first uplink signal overlaps a transmission timing of a second uplink signal which is transmitted from the terminal to the second base station, and a sum of the first transmission power and second transmission power which is used for the transmission of the second uplink signal exceeds a maximum transmission power of the terminal, second transmission power is controlled based on a processing time of the first uplink signal of the terminal.