Method and apparatus for transmitting qos flow to drb mapping rule

A method for transmitting, by a master base station, a rule for Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping to a secondary base station in a wireless communication system, the method comprising:

• receiving, from a user equipment (UE), a measurement result of the secondary base station;
• determining a data offloading to the secondary base station, based on the measurement result;
• and
• transmitting, to the secondary base station, the rule for QoS flow-to-DRB mapping of the master base station.

A source base station for transmitting a rule for Quality of Service (QoS) flow-to-data radio bearer (DRB) mapping to a target base station in a wireless communication system, the source base station comprising:

• a memory;
• a transceiver;
• and
• a processor, connected with the memory and the transceiver, that:
• controls the transceiver to receive, from a user equipment (UE), a measurement result of a target cell;
• determines a handover of the UE to the target base station, based on the measurement result;
• and
• controls the transceiver to transmit, to the target base station, a handover request message including the rule for QoS flow-to-DRB mapping of the source base station.