Section: 6.2.18 Network Data Analytics Function (NWDAF)
Content: The Network Data Analytics Function (NWDAF) includes one or more of the following functionalities: - Support data collection from NFs and AFs; - Support data collection from OAM; - Support retrieval of information from data repositories (e.g. UDR via UDM for subscriber-related information or via NEF(PFDF) for PFD information); - Support data collection of location information from LCS system; - NWDAF service registration and metadata exposure to NFs and AFs; - Support analytics information provisioning to NFs and AFs; - Support Machine Learning (ML) model training and provisioning to NWDAFs (containing Analytics logical function); - Support bulked data related to Analytics ID(s) provisioning for NFs; - Support accuracy information about Analytics IDs provisioning for NFs; - Support accuracy information or accuracy degradation about ML model provisioning for NFs; - Support roaming exchange capability to exchange data and analytics between PLMNs; - Support Federated Learning (FL) to train an ML model among multiple NWDAFs (containing MTLF). The details of the NWDAF functionality are defined in TS 23.288[ Architecture enhancements for 5G System (5GS) to support network data analytics services ]  [86]. NOTE 1: Some or all of the NWDAF functionalities can be supported in a single instance of an NWDAF. NOTE 2: NWDAF functionality beyond its support for Nnwdaf is out of scope of 3GPP.