Public land mobile network support for a stand-alone non-public access network

A user equipment (UE), comprising:

• a transceiver configured to communicate with one or more networks;
• and
• a processor configured to perform operations, the operations comprising:
• registering with a stand-alone non-public network (SNPN);
• transmitting an access network query protocol signal (ANQP) query to a data network via the SNPN;
• receiving an ANQP response from the data network in response to the ANQP query, wherein the ANQP response identifies a public land mobile network (PLMN) that is configured to be accessed via the data network and a non-third generation partnership program (3GPP) interworking function (N3IWF) of the PLMN;
• and
• transmitting a session initiation protocol (SIP) registration request to the PLMN via the data network using an internet protocol (IP) address assigned to the UE during a registration procedure with the SNPN.

A method, comprising:

• at a private branch exchange of a stand-alone non-public network (SNPN):
• transmitting an access network query protocol signal (ANQP) query to a data network;
• receiving an ANQP response from the data network in response to the ANQP query, wherein the ANQP response identifies a public land mobile network (PLMN) that is configured to be accessed via the data network and a non-third generation partnership program (3GPP) interworking function (N3IWF) of the PLMN;
• and
• transmitting a session initiation protocol (SIP) registration request to the PLMN via the data network using an internet protocol (IP) address assigned to the UE during a registration procedure with the SNPN.