A.32 Monitoring of service requests

28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS

The Service Request procedure is initiated via 3GPP access:

by the UE in CM‑IDLE state in order to send uplink signalling messages, user data, or as a response to a network paging request; or

by the network when the network needs to signal (e.g. N1 signalling to UE, Mobile-terminated SMS, User Plane connection activation for PDU Session(s) to deliver mobile terminating user data) with a UE.

The Service Request procedure via non-3GPP Access (including untrusted and trusted non-3GPP access) is used by a UE:

– in CM-IDLE state over non-3GPP access to request the re-establishment of the NAS signalling connection and the re-establishment of the user plane for all or some of the PDU Sessions which are associated to non-3GPP access; and

– in CM-CONNECTED state over non-3GPP access to request the re-establishment of the user plane for one or more PDU Sessions which are associated to non-3GPP access.

The Service Request procedures via 3GPP access and via untrusted/trusted non-3GPP Access need to be monitored respectively in order to know the performance of the 5G network in terms of providing services to the UEs.