6.3.19 DCCF discovery and selection

23.5013GPPRelease 18System architecture for the 5G System (5GS)TS

Multiple instances of DCCF may be deployed in a network.

The NF consumers shall utilize the NRF to discover DCCF instance(s) unless DCCF information is available by other means, e.g. locally configured on NF consumers. The DCCF selection function in NF consumers selects a DCCF instance based on the available DCCF instances.

The following factors may be considered by the NF consumer for DCCF selection:

– DCCF Serving Area information, i.e. list of TAIs for which the DCCF coordinates Data Sources.

– S-NSSAI.

– NF type of the data source.

– NF Set ID of the data source.

NOTE: NF Set ID can be used when the NF consumer is a DCCF when the DCCF determines that it needs to discover another DCCF which is responsible for co-ordinating the collection of required data. The DCCF discovers a target DCCF via NRF using NF Set ID of the data source.