Data transmission/reception method and apparatus in wireless communication system that supports multi-radio access technology

A method by a user equipment (UE) in a wireless communication system for supporting multi-radio access technology, the method comprising:

• connecting to a 4th-Generation (4G) communication system and a 5th-Generation (5G) communication system;
• transmitting a request message for creating a session of a service over the 4G communication system or the 5G communication system;
• and
• receiving a response message corresponding to the request message,
• wherein a data transmission path over the 4G communication system and the 5G communication system is determined according to the service associated with the request message.

A network entity in a wireless communication system for supporting multi-radio access technology, the network entity comprising:

• a transceiver;
• and
• a controller coupled with the transceiver configured to control to:
• receive, from a user equipment (UE), a request message for creating a session of a service over a 4th-Generation (4G) communication system or a 5th-Generation (5G) communication system, in case that the UE dually accesses the 4G communication system and the 5G communication system,
• determine a data transmission path over the 4G communication system and the 5G communication system according to the service associated with the request message, and
• transmit a response message corresponding to the request message.

A user equipment (UE) in a wireless communication system for supporting multi-radio access technology, the UE comprising:

• a transceiver;
• and
• a controller coupled with the transceiver configured to control to:
• connect to a 4th-Generation (4G) communication system and a 5th-Generation (5G) communication system,
• transmit a request message for creating a session of a service over the 4G communication system or the 5G communication system, and
• receive a response message corresponding to the request message,
• wherein a data transmission path over the 4G communication system and the 5G communication system is determined according to the service associated with the request message.