The following architectural assumptions are applicable for all potential solutions:
The NWDAF (Network Data Analytics Function) as defined in TS 23.503 is used for data collection and data analytics in centralized manner. An NWDAF may be used for analytics for one or more Network Slice.
For instances where certain analytics can be performed by a 5GS NF independently, a NWDAF instance specific to that analytic maybe collocated with the 5GS NF. The data utilized by the 5GS NF as input to analytics in this case should also be made available to allow for the centralized NWDAF deployment option.
5GS Network Functions and OAM decide how to use the data analytics provided by NWDAF to improve the network performance.
NWDAF utilizes the existing service based interfaces to communicate with other 5GC Network Functions and OAM.
A 5GC NF may expose the result of the data analytics to any consumer NF utilizing a service based interface.
The interactions between NF(s) and the NWDAF take place in the local PLMN (the reporting NF and the NWDAF belong to the same PLMN).
Solutions shall neither assume NWDAF knowledge about NF application logic. The NWDAF may use subscription data but only for statistical purpose.
It is further assumed that NWDAF and NFs cooperate adequately to contribute to consistent policies, analytics output results, and finally decision-making in the PLMN.
The Figure 4.2-1 shows general framework for 5G network automation in Release 16, depicting that the NWDAF should be able to collect data from the operator OAM, AFs and 5GC network functions.
As part of this study, exchange of information between NWDAF and OAM may be defined. Interactions between OAM and NWDAF shall be based on use case requirements. The OAM could be a potential consumer or provider of the information for the NWDAF. The definition of such interaction shall be coordinated with SA WG5.
For the collection of OAM data, the NWDAF shall reuse existing mechanisms and interfaces defined by SA WG5. For OAM information exchange beyond existing mechanisms and interfaces defined by SA WG5, close co-operation with SA WG5 is needed.
Depending on network deployments and on AF(s), the AF may exchange information with the NWDAF via the NEF, or use the service based interfaces to access the NWDAF directly.
NWDAF accesses network data from data repositories (e.g. UDR).
For 5GC NFs, the NWDAF utilizes the service based interfaces to communicate to get network data and dedicated analytics.
Based on the aforementioned data collection, the NWDAF performs data analysis and provides the analytical result to the AF, the 5GC NFs and the OAM.
The output of the analytics provided to the AF, NFs, and OAM by the NWDAF and vice versa will be defined depending on the selected solutions for the key issues.