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

Claim 3:
4. A communication control method performed by a user device for implementing error handling, the communication control method comprising:
establishing, with at least one control device in a core network, a Protocol Data Unit (PDU) session for a Local Area Data Network (LADN) in a PDU session establishment procedure that uses an LADN Data Network Name (DNN);
transmitting, to the at least one control device in the core network, a first PDU session modification request message used to initiate a PDU session modification procedure,
receiving, in the PDU session modification procedure, an No. 46 5G Session Management (5GSM) cause value from the at least one control device in the core network; and
prohibiting, based on reception of the No. 46 5GSM cause value, transmission of a second PDU session modification request message for the PDU session,, wherein:
the LADN DNN is provided by the user device in the PDU session establishment procedure,
the No. 46 5GSM cause value indicates an update to LADN information stored at the user device,
the user device requests, based on reception of the No. 46 5GSM cause value, new LADN information by including an LADN indication information element in a registration request message used to initiate a registration procedure for requesting the new LADN information, 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.