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5GS – UE‑Triggered Service Request – 03 of 36
Signalling flow for TS 23.502 UE-Triggered Service Request: (R)AN to AMF - N2 Message (N2 parameters, MM NAS Service Request)

Step 2, verbatim
(R)AN to AMF: N2 Message (N2 parameters, MM NAS Service Request).
Details of this step are described in TS 38.413 [10]. If the AMF can't handle the Service Request it will reject it.
When NG-RAN is used, the N2 parameters include the 5G‑GUTI, Selected PLMN ID, Location information, RAT type and Establishment cause.
If the UE is in CM-IDLE state, the RAN obtains the 5G‑GUTI in RRC procedure. RAN selects the AMF according to 5G‑GUTI. The Location Information and RAT type relates to the cell in which the UE is camping.
Based on the PDU Session status, the AMF may initiate PDU Session Release procedure in the network for the PDU Sessions whose PDU Session ID(s) were indicated by the UE as not available.