name: NAI
full_form: Network Access Identifier
context: The NAI for SUPI shall have the form username@realm as specified in clause 2.2 of IETF RFC 7542 [126]. A SUPI containing a network specific identifier shall take the form of a Network Access Identifier (NAI). See clause 5.9.2 of 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  [119] for the definition and use of the network specific identifier. In SNPN scenarios, the realm part of the NAI may include MCC, MNC and the NID of the SNPN (see 3GPP TS 23.501[ System architecture for the 5G System (5GS) ]  clauses 5.30.2.3, 5.30.2.9, 6.3.4, and 6.3.8; for the realm part format see Home Network Domain for an SNPN in clause 28.2). See clauses 28.15.2 and 28.16.2 for the NAI format for a SUPI containing a GCI or a GLI.
description: The Network Access Identifier (NAI) is a unique identifier used to identify users or devices in a network, particularly in the context of the 5G System Architecture. It follows the format 'username@realm' as specified in IETF RFC 7542 and is utilized in various scenarios, including Single Network Public Namespace (SNPN), where it may include Mobile Country Code (MCC), Mobile Network Code (MNC), and the NID of the SNPN. The NAI plays a crucial role in identifying network-specific identifiers for SUPIs (Subscriber Permanent Identifier) containing such identifiers.
explanation: NAI is classified as an Identifier because it serves as a unique identifier for users or devices within the network, adhering to specific formatting rules and utilized across different network scenarios as defined by 3GPP specifications.
section_title: 28.7.2 NAI format for SUPI
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