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Signalling flows related to 5GS procedures (TS 23.502)

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R1. General Registration
A UE needs to register with the network to get authorized to receive services, to enable mobility tracking and to enable reachability.
S1. UE‑Triggered Service Request
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.