The present invention provides a communication control method pertaining to control signal management based on reasons for refusal pertaining to a DN authentication procedure. The transmission of a new PDU session establishment message that uses the same parameter as the DNN included in a PDU session establishment message having been refused on the basis of a reason for refusal that indicates DN authentication failure other than EAP failure is suppressed. The transmission of a new PDU session establishment message that uses the same information as the combination of the DNN and an S-NSSAI included in the refused PDU session establishment message is suppressed.
UE AND SMF