Method and device for transmitting uplink channel, by terminal, for dual connectivity in wireless communication system

A method performed by a master base station supporting a terminal performing dual connectivity (DC) between the master base station and a secondary base station in a wireless communication system, the method comprising:

• transmitting, to a terminal, the terminal a time division duplex (TDD) uplink (UL)-downlink (DL) configuration for a primary cell (PCell) of a master cell group (MCG) supported by the master base station;
• transmitting, to the terminal, a first reference TDD configuration for determining an uplink transmission timing;
• and
• receiving an uplink signal from the terminal according to a second reference TDD configuration determined based on the TDD UL-DL configuration and the first reference TDD configuration.

A terminal performing dual connectivity (DC) between a master base station and a secondary base station in a wireless communication system, comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to:
• obtain a time division duplex (TDD) uplink (UL)-downlink (DL) configuration for a primary cell (PCell) of a master cell group (MCG) supported by the master base station,
• obtain a first reference TDD configuration for determining an uplink transmission timing,
• determine a second reference TDD configuration based on the TDD UL-DL configuration and the first reference TDD configuration, and
• transmit an uplink signal to at least one of the master base station or the secondary base station according to the second reference TDD configuration.

A master base station supporting a terminal performing dual connectivity (DC) between the master base station and a secondary base station in a wireless communication system, comprising:

• a transceiver configured to transmit and receive signals;
• and
• a controller configured to:
• transmit, to a terminal, the terminal a time division duplex (TDD) uplink (UL)-downlink (DL) configuration for a primary cell (PCell) of a master cell group (MCG) supported by the master base station,
• transmit, to the terminal a first reference TDD configuration for determining an uplink transmission timing, and
• receive an uplink signal from the terminal according to a second reference TDD configuration determined based on the TDD UL-DL configuration and the first reference TDD configuration.