Patent ID: 11956681
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A packet data network gateway-control plane+session management function (PGW-C+SMF) in a mobile communication system, the PGW-C+SMF comprising at least one module configured to:
transmit, to a packet data network gateway-user plane+user plane function (PGW-U+UPF), a request message including first information for allocating a tunnel for data forwarding to the PGW-U+UPF, in case that a terminal is handed over from a 5th generation system (5GS) to an evolved packet system (EPS),
as a response to the request message, receive, from the PGW-U+UPF, a response message including second information on the tunnel for the data forwarding to the PGW-U+UPF, and
transmit, to a first base station associated with the 5GS, the second information,
wherein the first information includes a quality of service (QoS) flow identifier for the data forwarding to the PGW-U+UPF,
wherein a QoS flow corresponding to the QoS flow identifier is mapped into a data forwarding tunnel associated with the EPS,
wherein the second information is used to forward at least one data packet from the first base station to a second base station associated with the EPS through the PGW-U+UPF, and
wherein the second information includes a tunnel endpoint identifier (TEID) for a protocol data unit (PDU) session for the data forwarding to the PGW-U+UPF.