Patent ID: 11963240
Assignee: FG INNOVATION COMPANY LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. At least one control device in a core network for implementing error handling, the at least one control device in the core network comprising:
a transceiver unit that:
receives, from a user device, a first Protocol Data Unit (PDU) session modification request message used to initiate a PDU session modification procedure,
transmits, in the PDU session modification procedure, an No. 46 5G Session Management (5GSM) cause value to the user device in order to indicate that the user device is prohibited from transmitting a second PDU session modification request message for a PDU session for a Local Area Data Network (LADN), and
receives, from the user device, a registration request message used to initiate a registration procedure for requesting new LADN information, wherein:
the PDU session for the LADN is established in a PDU session establishment procedure using an LADN Data Network Name (DNN),
the LADN DNN is provided in the PDU session establishment procedure, the No. 46 5GSM cause value indicates an update to LADN information stored at the user device,
the registration request message includes an LADN indication information element and is transmitted based on reception of the No. 46 5GSM cause value, and
the transmission of the second PDU session modification request message for the PDU session for the LADN is prohibited until the registration procedure for requesting the new LADN information is completed.