5.30.2.1 Identifiers

The combination of a PLMN ID and a Network identifier (NID) identifies an SNPN.

NOTE 1: The PLMN ID used for SNPNs is not required to be unique. PLMN IDs reserved for use by private networks can be used for non-public networks, e.g. based on mobile country code (MCC) 999 as assigned by ITU [78]). Alternatively, a PLMN operator can use its own PLMN IDs for SNPN(s) along with NID(s), but registration in a PLMN and mobility between a PLMN and an SNPN are not supported using an SNPN subscription given that the SNPNs are not relying on network functions provided by the PLMN.

The NID shall support two assignment models:

• Self-assignment: NIDs are chosen individually by SNPNs at deployment time (and may therefore not be unique) but use a different numbering space than the coordinated assignment NIDs as defined in TS 23.003 [19].
• Coordinated assignment: NIDs are assigned using one of the following two options:

1. The NID is assigned such that it is globally unique independent of the PLMN ID used; or

2. The NID is assigned such that the combination of the NID and the PLMN ID is globally unique.

NOTE 2: Which legal entities manage the number space is beyond the scope of this specification.

NOTE 3: The use of SNPN with self-assignment model NID such that the combination of PLMN ID and NID is not globally unique is not assumed for the architecture described in Figure 5.30.2.9.3-1, Figure 5.30.2.9.2-1 and for SNPN - SNPN Mobility as described in clause 5.30.2.11.

The GIN shall support two assignment models:

• Self-assignment: GINs are chosen individually and may therefore not be unique. It is defined as in TS 23.003 [19]; or
• Coordinated assignment: GIN uses a combination of PLMN ID and NID and is assigned using one of the following two options as defined in TS 23.003 [19]:

1. The GIN is assigned such that the NID is globally unique (e.g. using IANA Private Enterprise Numbers) independent of the PLMN ID used; or

2. The GIN is assigned such that the combination of the NID and the PLMN ID is globally unique.

NOTE 4: Which legal entities manage the number space for GIN is beyond the scope of this specification.

An optional human-readable network name helps to identify an SNPN during manual SNPN selection. The human-readable network name and how it is used for SNPN manual selection is specified in TS 22.261 [2] and TS 23.122 [17].