Section: 28.3.2.3 PLMN level and Home NF Repository Function (NRF) FQDN 28.3.2.3.1 General
Content: When an NF is instantiated, it may register with a PLMN level NF Repository Function (NRF). It may then discover other NF instance(s) in the 5GC by querying the PLMN level NRF. The IP address of the PLMN level NRF can be provisioned into the NF, or the NF can be pre-configured with the FQDN of the PLMN level NRF. If the PLMN level NRF addresses and FDQN are not provisioned into the NF, the NF self-constructs the PLMN level NRF FQDN as per the format specified in clause 28.3.2.3.2. For NF discovery across PLMNs, the NRF (e.g vNRF) shall self-construct the PLMN level NRF FQDN of the target PLMN (e.g hNRF) as per the format specified in clause 28.3.2.3.2, and the hNRF URI as per the format specified in subsclause 28.3.2.3.3, if the NRF has not obtained the NRF FQDN of the target PLMN.