Section: 5.3.5 Triggers for network analytics
Content: Triggers for the AMF to request for or subscribe to the analytics information from the NWDAF are internal logic in the AMF and may include for example: - UE access and mobility related event subscription by other NFs (e.g. SMF, NEF); - locally detected events; - analytics information received. The trigger conditions may depend on operator and implementation policy in the AMF. When a trigger condition happens, the AMF may decide if any analytics information is needed and if so, request for or subscription to the analytics information from the NWDAF. The AMF may, upon detection of certain local events, e.g. frequent mobility re-registration of one or more UEs, subscribe to mobility related abnormal behaviour analytics of the UE(s) as described in TS 23.288[ Architecture enhancements for 5G System (5GS) to support network data analytics services ]  [86] in order to trace UE mobility trend and take appropriate actions.