Device and method for operating dual connectivity structure in wireless communication system

A master node (MN) apparatus for multi-radio-dual connectivity (MR-DC) in a wireless communication system, the apparatus comprising:

• a transceiver;
• and
• at least one processor operatively coupled to the transceiver,
• wherein the at least one processor is configured to:
• transmit a request message to a secondary node (SN), wherein the request message includes information indicating at least one band combination and first data rate information on a data rate of a master cell group (MCG) for each of the at least one band combination, and
• receive a response message including information indicating an identified band combination from the SN, and
• wherein the band combination is identified among the at least one band combination, based on the first data rate information and second data rate information on a data rate of a secondary cell group (SCG).

A method of operating a secondary node (SN) for multi-radio-dual connectivity (MR-DC) in a wireless communication system, the method comprising:

• receiving a request message from a master node (MN), wherein the request message includes information indicating at least one band combination and first data rate information on a data rate of a master cell group (MCG) for each of the at least one band combination;
• identifying a band combination from among the at least one band combination, based on the first data rate information and second data rate information on a data rate of a secondary cell group (SCG);
• and
• transmitting a response message including information indicating the identified band combination to the MN.

A method of operating a master node (MN) apparatus for multi-radio-dual connectivity (MR-DC) in a wireless communication system, the method comprising:

• transmitting a request message to a second node (SN), wherein the request message includes information indicating at least one band combination and first data rate information on a data rate of a master cell group (MCG) for each of the at least one band combination;
• and
• receiving a response message including information indicating an identified band combination from the SN,
• wherein the band combination is identified among the at least one band combination, based on the first data rate information and second data rate information on a data rate of a secondary cell group (SCG).