Section: 6.4 Permanent Equipment Identifier (PEI)
Content: In 5GS, the Permanent Equipment Identifier (PEI) identifies a UE. The PEI is defined as: - a PEI type: in this release of the specification, it may indicate an IMEI or IMEISV, a MAC address or an IEEE Extended Unique Identifier (EUI-64); and - dependent on the value of the PEI type: - an IMEI as defined in clause 6.2.1; or - an IMEISV as defined in clause 6.2.2; or - a MAC address (48-bit MAC identifier, as defined in IETF RFC 7042 [132]); or - an IEEE Extended Unique Identifier (EUI-64), for UEs not supporting any 3GPP access technologies, as defined in IEEE "Guidelines for Use of Extended Unique Identifier (EUI), Organizationally Unique Identifier (OUI), and Company ID (CID)" [136].