Method and apparatus for establishing dual-connectivity to transmit data in new radio communication architecture

A master base station in a wireless communication system, the master base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• transmit via the transceiver, to a secondary base station, a secondary base station addition request message including a quality of service (QoS) flow identifier and a protocol data unit (PDU) session identifier associated with the QoS flow identifier,
• receive via the transceiver, from the secondary base station, a secondary base station addition response message including a data radio bearer (DRB) identifier, the QoS flow identifier associated with the DRB identifier, the PDU session identifier associated with the QoS flow identifier and tunnel information associated with data reception, and
• transmit via the transceiver, to a core network entity, a modification request message including the QoS flow identifier, the PDU session identifier associated with the QoS flow identifier and the tunnel information associated with the data reception.

A secondary base station in a wireless communication system, the secondary base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• receive via the transceiver, from a master base station, a secondary base station addition request message including a quality of service (QoS) flow identifier and a protocol data unit (PDU) session identifier associated with the QoS flow identifier, and
• transmit via the transceiver, to the master base station, a secondary base station addition response message including a data radio bearer (DRB) identifier, the QoS flow identifier associated with the DRB identifier, the PDU session identifier associated with the QoS flow identifier and tunnel information associated with data reception.