Section: 28.13 NF Service Set Identifier (NF Service Set ID)
Content: A NF Service Set Identifier is a globally unique identifier of a set of equivalent and interchangeable CP NF service instances within a NF instance from a given network that provide distribution, redundancy and scalability (see clause 5.21.3 of 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119]). An NF Service Set Identifier shall be constructed from the MCC, MNC, NID (for SNPN), NF instance Identifier, service name and a Set ID. A NF Service Set Identifier shall be formatted as the following string: set<Set ID>.sn<Service Name>.nfi<NF Instance ID>.5gc.mnc<MNC>.mcc<MCC> for a NF Service Set in a PLMN, or set<Set ID>.sn<Service Name>.nfi<NF Instance ID>.5gc.nid<NID>.mnc<MNC>.mcc<MCC> for a NF Service Set in a SNPN. where: - the <MCC> and <MNC> shall identify the PLMN of the NF Service Set and shall be encoded as follows: - <MCC> = 3 digits - <MNC> = 3 digits If there are only 2 significant digits in the MNC, one "0" digit shall be inserted at the left side to fill the 3 digits coding of MNC. - the Network Identifier (NID) shall be encoded as hexadecimal digits as specified in clause 12.7. - the NFInstanceID shall identify the NF instance of the NF Service set, as defined by 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119] and 3GPP TS 29.510[ 5G System; Network function repository services; Stage 3 ]  [130]; - the ServiceName shall identify the NF service of the NF Service set, as defined by 3GPP TS 29.510[ 5G System; Network function repository services; Stage 3 ]  [130]; - the Set ID shall be a service specific Set ID within the NF instance, chosen by the operator that shall consist of alphabetic characters (A-Z and a-z), digits (0-9) and/or the hyphen (-) and that shall end with either an alphabetic character or a digit; - the case of alphabetic characters is not significant (i.e. two NF Service Set IDs with the same characters but using different lower and upper cases identify the same NF Service Set). EXAMPLE 1: setxyz.snnsmf-pdusession.nfi54804518-4191-46b3-955c-ac631f953ed8.5gc.mnc012.mcc345 EXAMPLE 2: set2.snnpcf-smpolicycontrol.nfi54804518-4191-46b3-955c-ac631f953ed8.5gc.mnc012.mcc345 EXAMPLE 3: setxyz.snnsmf-pdusession.nfi54804518-4191-46b3-955c-ac631f953ed8.5gc.nid000007ed9d5.mnc012.mcc345 for a SNPN with the NID 000007ed9d5 (hexadecimal). NF service instances from different NF instances are equivalent NF service instances if they share the same MCC, MNC, NID (for SNPN), ServiceName and Set ID. NF Service Sets belonging to different NF Instances are said to be equivalent, if they share the same MCC, MNC, NID (for SNPN), ServiceName and Set ID.