name: SUPI
full_form: SUbscription Permanent Identifier
context: TS 33.501 [9] defines the ability to prevent the SUPI being exposed over the 5G RAN through the use of SUCI. Where SUPI privacy is implemented by both the UDM and UE, the SUPI is not sent in the clear over the RAN. Therefore, AMF has to rely on the UDM to provide the SUPI as part of the registration procedure as defined in TS 33.501 [9]. If the AMF receives a SUCI from the UE then the AMF shall ensure for every registration (including re-registration) that SUPI has been provided by the UDM to the AMF and that the SUCI to SUPI mapping has been verified as defined in TS 33.501 [9]. This shall be performed regardless of whether the SUPI is a target of interception. The AMF IRI-POI shall provide both the SUPI and the current SUCI in all applicable events defined in clause 6.2.2.4.
description: The Subscription Permanent Identifier (SUPI) is a critical network attribute used for identifying subscribers within the 5G core network, ensuring their privacy and security during registration procedures.
explanation: Given the context from 3GPP TS 33.127, section 6.2.2.3, SUPI is classified as a Parameter because it refers to an essential attribute or identifier used in telecommunications operations, specifically for subscriber identification and privacy protection.
section_title: 6.2.2.3	Identity privacy
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