Electronic device supporting dual connectivity, and operation method therefor

A method performed by an electronic device, the method comprising:

• selecting one of a transmission path based on a first radio access technology (RAT) and a transmission path based on a second RAT as a first transmission path, wherein the first transmission path is an uplink data transmission path to be used in the electronic device for a dual connectivity communication;
• performing an operation of stopping uplink data transmission and maintaining uplink control information transmission on a second transmission path other than the first transmission path among the transmission path based on the first RAT and the transmission path based on the second RAT;
• and
• performing an operation of transmitting at least one of uplink data or uplink control information on the first transmission path.

An electronic device comprising:

• communication circuitry;
• one or more processors comprising processing circuitry;
• and, memory storing instructions that, when executed by the one or more processors individually or collectively, cause the electronic device to:
• based on a designated condition being satisfied:
• select one of a transmission path based on a first radio access technology (RAT) and a transmission path based on a second RAT as a first transmission path, wherein the first transmission path is an uplink data transmission path to be used in the electronic device for a dual connectivity communication,
• perform, via the communication circuitry, an operation of stopping uplink data transmission and maintaining uplink control information transmission on a second transmission path other than the first transmission path among the transmission path based on the first RAT and the transmission path based on the second RAT, and
• perform, via the communication circuitry, an operation of transmitting at least one of uplink data or uplink control information on the first transmission path,
• based on the designated condition being unsatisfied:
• based on an amount of the uplink data, transmit the uplink data by using the transmission path based on the first RAT and the transmission path based on the second RAT, or by using a primary path among the transmission path based on the first RAT and the transmission path based on the second RAT.