Method and apparatus for supporting data transmission of network node in wireless communication system

A network node that supports data transmission in a wireless communication system, the network node comprising:

• a communication module configured to transmit and receive a signal;
• and
• a processor configured to control the communication module,
• wherein the processor is further configured to:
• receive downlink data from a Data Network (DN),
• not encapsulate the received downlink data with an Internet Protocol (IP) address of a User Equipment (UE) when the DN is the IP based network, and encapsulate the received downlink data with the IP address of the UE when the DN is a non-IP based network,
• transmit the downlink data encapsulated with the IP address or the downlink data that are not encapsulated with the IP address to an Access Network (AN),
• receive uplink data encapsulated with the IP address of the UE from the AN,
• not de-capsulate the encapsulated uplink data when the DN is the IP based network, and de-capsulate the encapsulated uplink data when the DN is the non-IP based network, and
• transmit the de-capsulated uplink data or the uplink data that are not de-capsulated to the DN.