Section: 5.2.5 Subscriber privacy
Content: The UE shall support 5G-GUTI. The SUPI should not be transferred in clear text over NG-RAN except routing information, e.g. Mobile Country Code (MCC) and Mobile Network Code (MNC). The Home Network Public Key shall be stored in the USIM. The protection scheme identifier shall be stored in the USIM. The Home Network Public Key Identifier shall be stored in the USIM. The SUCI calculation indication, either USIM or ME calculating the SUCI, shall be stored in USIM. The ME shall support the null-scheme.If the home network has not provisioned the Home Network Public Key in USIM, the SUPI protection in initial registration procedure is not provided. In this case, the null-scheme shall be used by the ME. Based on home operator's decision, indicated by the USIM, the calculation of the SUCI shall be performed either by the USIM or by the ME. NOTE 1: If the SUCI calculation indication is not present, the calculation is in the ME. In case of an unauthenticated emergency call, privacy protection for SUPI is not required. Provisioning, and updating the Home Network Public Key, Home Network Public Key Identifier, protection scheme identifier, Routing Indicator, and SUCI calculation indication in the USIM shall be in the control of the home network operator. NOTE 2: The provisioning and updating of the Home Network Public Key, Home Network Public Key Identifier, protection scheme identifier, and SUCI calculation indication is out of the scope of the present document. It can be implemented using, e.g. the Over the Air (OTA) mechanism. Routing Indicator can be updated, e.g., by OTA or as defined in clause 6.15. Subscriber privacy enablement shall be under the control of the home network of the subscriber. The UE shall only send the PEI in the NAS protocol after NAS security context is established, unless during emergency registration when no NAS security context can be established. The Routing Indicator shall be stored in the USIM. If the Routing Indicator is not present in the USIM, the ME shall set it to a default value as defined in TS 23.003[ Numbering, addressing and identification ]  [19].