5.30.2.0 General

SNPN 5GS deployments are based on:

• the architecture depicted in clause 4.2.3;
• the architecture for 5GC with Untrusted non-3GPP access (Figure 4.2.8.2.1-1) for either access to SNPN services via a PLMN (and vice versa) or for direct access to SNPN via non-3GPP access;
• the architecture for 5GC with Trusted non-3GPP access (Figure 4.2.8.2.1-2); and
• the additional functionality covered in clause 5.30.2.

Alternatively, a Credentials Holder (CH) may authenticate and authorize access to an SNPN separate from the Credentials Holder based on the architecture specified in clause 5.30.2.9. Idle and connected mode mobility is supported as defined in clause 5.30.2.11.

Clauses 5.30.2.1 to 5.30.2.11 specify the common SNPN aspects applicable to both 3GPP and non-3GPP access, except where stated differently.

Aspects specific to Untrusted non-3GPP access for SNPN are specified in clause 5.30.2.12.

Aspects specific to Trusted non-3GPP access for SNPN are specified in clause 5.30.2.13.

Aspects specific to N5CW devices accessing SNPN services are specified in clause 5.30.2.15.

Aspects specific to Proximity based Services (ProSe) for SNPN are defined in TS 23.304 [128].

The following 5GS features and functionalities are not supported for SNPNs:

• Interworking with EPS;
• Emergency services when the UE accesses the SNPN over NWu via a PLMN;
• Roaming, e.g. roaming between SNPNs. However, it is possible for a UE to access an SNPN with credentials from a CH as described in clause 5.30.2.9 and to move between equivalent SNPNs;
• Handover between SNPN and PLMN or PNI-NPN;
• CIoT 5GS Optimizations;
• CAG.

A UE with two or more network subscriptions, where one or more network subscriptions may be for a subscribed SNPN, can apply procedures specified for Multi-USIM UEs as described in clause 5.38. The UE shall use a separate PEI for each network subscription when it registers to the network.

NOTE: The number of preconfigured PEIs for a UE is limited. If the number of network subscriptions for a UE is greater than the preconfigured number of PEIs, the number of network subscriptions that can be registered with the network simultaneously is restricted by the number of pre-configured number of PEIs.