Terminal apparatus, core network apparatus, and communication control method

A User Equipment (UE) comprising:

• transmission and/or reception circuitry configured to receive a first Data Network Name (DNN) corresponding to a Data Network (DN) in a Registration Accept message in a Registration procedure;
• and
• a memory configured to:
• store the first DNN;
• and
• update the first DNN to a second DNN when the transmission and/or reception circuitry further receives a control message including the second DNN in an update procedure.

A User Equipment (UE) comprising:

• transmition and/or reception circuitry;
• and
• control circuitry,
• wherein
• in a Protocol Data Unit (PDU) Session establishment procedure, the transmition and/or reception circuitry is configured to:
• transmit, to an Access and Mobility Management Function (AMF), a Non-Access-Stratum (NAS) message including a PDU session establishment request message and a Data Network Name (DNN) corresponding to a Data Network (DN);
• and
• receive a PDU session establishment reject message including a first information,
• and
• the transmition and/or reception circuitry is configured not to send another PDU session establishment request message for the DNN during the PDU session establishment procedure based on the reception of the first information.

A communication method performed by a User Equipment (UE), the communication method comprising:

• in a Protocol Data Unit (PDU) Session establishment procedure,
• transmitting, to an Access and Mobility Management Function (AMF), a Non-Access-Stratum (NAS) message including a PDU session establishment request message and a Data Network Name (DNN) corresponding to a Data Network (DN),
• receiving a PDU session establishment reject message including a first information, and
• not sending another PDU session establishment request message for the DNN during the PDU session establishment procedure based on the reception of the first information.