Method and apparatus for generating connection in wireless communication system

A method performed by a secondary base station supporting a dual connectivity with a master base station in a wireless communication system, the method comprising:

• receiving, from the master base station, address information associated with data forwarding;
• forwarding, from the secondary base station to a target master base station, a data based on the address information during a handover of a terminal from the master base station that is a source base station to the target master base station;
• and
• transmitting, to the master base station, a first message associated with a data usage of the secondary base station, the first message including information on a data volume for a radio access technology (RAT) of the secondary base station,
• wherein the information on the data volume for the RAT of the secondary base station is delivered via the master base station to a first network entity performing a mobility management based on a trigger by the handover, and
• wherein the data volume for the RAT of the secondary base station reported to the first network entity excludes data that is forwarded from the secondary base station to the target master base station based on the address information during the handover.

A method performed by a first network entity performing a mobility management for a terminal configured with a dual connectivity with a master base station and a secondary base station in a wireless communication system, the method comprising:

• receiving, from the master base station, a first message for reporting a data usage of the secondary base station, based on a trigger by a handover of the terminal from the master base station that is a source base station to a target master base station,
• wherein the first message includes information on a data volume for a radio access technology (RAT) of the secondary base station, and the information on the data volume for the RAT of the secondary base station is included in a second message transmitted from the secondary base station to the master base station,
• wherein the data volume for the RAT of the secondary base station reported to the first network entity excludes data that is forwarded from the secondary base station to the target master base station based on address information during the handover, and
• wherein the address information associated with data forwarding is transmitted from the master base station to the secondary base station.

A master base station supporting a dual connectivity with a secondary base station in a wireless communication system, the master base station comprising:

• a transceiver configured to transmit or receive a signal;
• and
• a controller configured to:
• transmit, via the transceiver to the secondary base station, address information associated with data forwarding,
• receive, via the transceiver from the secondary base station, a first message associated with a data usage of the secondary base station, the first message including information on a data volume for a radio access technology (RAT) of the secondary base station, and
• transmit, via the transceiver to a first network entity performing a mobility management, a second message including the information on the data volume for the RAT of the secondary base station, based on a trigger by a handover of a terminal from the master base station that is a source base station to a target master base station,
• wherein the data volume for the RAT of the secondary base station reported to the first network entity excludes data that is forwarded from the secondary base station to the target master base station based on the address information during the handover.