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5GS procedure – UE‑Triggered Service Request

from:  TS 23.502 – Clause
The Service Request procedure is used by a UE in CM-IDLE state or the 5GC to request the establishment of a secure connection to an AMF. The Service Request procedure is also used both when the UE is in CM-IDLE and in CM-CONNECTED to activate a User Plane connection for an established PDU Session.
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5GS – UE‑Triggered Service Request – 01 of 36
Overview of signalling flow for TS 23.502 UE-Triggered Service Request