Access And Mobility Management Function (Amf) Device, User Equipment (Ue), Method Of Amf Device And Method Of Ue

Abstract: [Problem] This disclosure proposes solutions for some situations in the 3GPP nodes or some situations in the connection between the 3GPP nodes during the Network Slice Admission Control (NSAC) procedure. [Solution] An Access and Mobility Management Function (AMF) device for communicating with a User equipment (UE) and a Network Slice Admission Control Function (NSACF) device includes a receiver and a transmitter. The receiver is configured to receive, from the UE, a Registration Request message including first information indicating whether the UE supports a first function and requested Network Slice Selection Assistance Information (NSSAI). The transmitter is configured to transmit, to the UE, a Non-Access Stratum (NAS) message including a rejected NSSAI including a first cause value and a back-off timer value if the UE supports the first function. The transmitter is configured to transmit, to the UE, the NAS message including a rejected NSSAI including a second cause value if the UE does not support the first function.

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