Method, network device, and system for implementing data processing, and storage medium

A core network, comprising:

• at least one processor of a transceiver, configured to:
• receive a first message transmitted by a primary base station, the first message comprising first information of a first protocol data unit (PDU) session, the first information indicating a splitting of the first PDU session into a split PDU session, wherein the first information of the first PDU session comprises a PDU session identifier of the first PDU session and next generation (NG) interface downlink tunnel endpoint information;
• and
• transmit a second message in response to receiving the first message, the second message comprising second information of the first PDU session, wherein the second information indicates acceptance of the splitting of the first PDU session by the core network, and comprises at least one quality of service (QoS) flow identifier associated with the split PDU session.

A primary base station, comprising:

• at least one processor of a transceiver, configured to:
• transmit a first message to a core network, the first message comprising first information of a first protocol data unit (PDU) session, the first information indicating a splitting of the first PDU session into a split PDU session, wherein the first information of the first PDU session comprises a PDU session identifier of the first PDU session and next generation (NG) interface downlink tunnel endpoint information;
• and
• receive, from the core network, a second message in response to the first message, the second message comprising second information of the first PDU session, wherein the second information indicates acceptance of the splitting of the first PDU session by the core network, and comprises at least one quality of service (QoS) flow identifier associated with the split PDU session.