Service Request Procedure
The AMF supports the Service Request procedure used by a UE in CM-IDLE state or the 5GC to request the establishment for a secure connection to an AMF. The Service Request procedure is also used when the UE is in CM-IDLE and in CM-CONNECTED state to activate a User Plane connection for an established PDU Session.
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UE Triggered—The AMF supports UE in Idle state initiating Service request procedure for sending uplink signalling messages, user data or other reasons.
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Network Triggered Service Request/Paging—The AMF supports procedure when the network needs to send Paging Request to RAN based on trigger(s) from UDM, SMF and other NF nodes. The paging request triggers the UE to initiate Service Request procedure.
The following features are related to this use case: