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full Contents for  TS 23.288  Word version:   16.3.0

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4  Reference Architecture for Data Analytics
4.1  General
The NWDAF (Network Data Analytics Function) is part of the architecture specified in TS 23.501 and uses the mechanisms and interfaces specified for 5GC in TS 23.501 and OAM services (see clause 6.2.3.1).
The NWDAF interacts with different entities for different purposes:
  • Data collection based on subscription to events provided by AMF, SMF, PCF, UDM, AF (directly or via NEF), and OAM;
  • Retrieval of information from data repositories (e.g. UDR via UDM for subscriber-related information);
  • Retrieval of information about NFs (e.g. from NRF for NF-related information);
  • On demand provision of analytics to consumers, as specified in clause 6.
A single instance or multiple instances of NWDAF may be deployed in a PLMN. If multiple NWDAF instances are deployed, the architecture supports deploying the NWDAF as a central NF, as a collection of distributed NFs, or as a combination of both.
NOTE 1:
When multiple NWDAFs exist, not all of them need to be able to provide the same type of analytics results, i.e., some of them can be specialized in providing certain types of analytics. An Analytics ID information element is used to identify the type of supported analytics that NWDAF can generate.
NOTE 2:
NWDAF instance(s) can be collocated with a 5GS NF.
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4.2  Non-roaming architecture
As depicted in Figure 4.2-1, the 5G System architecture allows NWDAF to collect data from any 5GC NF. The NWDAF belongs to the same PLMN as the 5GC NF that provides the data.
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The Nnf interface is defined for the NWDAF to request subscription to data delivery for a particular context, to cancel subscription to data delivery and to request a specific report of data for a particular context.
The 5G System architecture allows NWDAF to retrieve the management data from OAM by invoking OAM services.
As depicted in Figure 4.2-2, the 5G System architecture allows any 5GC NF to request network analytics information from NWDAF. The NWDAF belongs to the same PLMN as the 5GC NF that consumes the analytics information.
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The Nnwdaf interface is defined for 5GC NFs, to request subscription to network analytics delivery for a particular context, to cancel subscription to network analytics delivery and to request a specific report of network analytics for a particular context.
4.3  Roaming architectureWord-p. 8
The interactions between the NWDAF and the other 5GC NFs are only considered in the same PLMN case.
Roaming architecture does not apply in this release of the specification.
5  Network Data Analytics Functional Description
5.1  General
The NWDAF provides analytics to 5GC NFs, and OAM as defined in clause 7.
Analytics information are either statistical information of the past events, or predictive information.
Different NWDAF instances may be present in the 5GC, with possible specializations per type of analytics. The capabilities of a NWDAF instance are described in the NWDAF profile stored in the NRF.
In order to support NFs that are consumers of analytics with the discovery of a NWDAF instance that is able to provide some specific type of analytics, each NWDAF instance should provide the list of Analytics ID(s) that it supports when registering to the NRF, in addition to other NRF registration elements of the NF profile. Other NFs requiring the discovery of an NWDAF instance that provides support for some specific type of analytics may query the NRF and include the Analytics ID(s) that identifies the desired type of analytics for that purpose.
The consumers i.e. 5GC NFs and OAM decide how to use the data analytics provided by NWDAF.
The interactions between 5GC NF(s) and the NWDAF take place within a PLMN.
The NWDAF has no knowledge about NF application logic. The NWDAF may use subscription data but only for statistical purpose.
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5.2  NWDAF Discovery and Selection
The NWDAF service consumer selects an NWDAF that supports requested analytics information by using the NWDAF discovery principles defined in clause 6.3.13 of TS 23.501.

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