Question: Where are 5GMM parameters (e.g., 5G-GUTI, Last visited TAI in 5GS, 5GS update status) stored if the corresponding file is not present on the Universal Subscriber Identity Module (USIM), and under what condition can they be used?
Option 1: In a volatile memory of the Mobile Equipment (ME), without any matching requirement for the SUPI.
Option 2: In a non-volatile memory of the ME, but only if the SUPI from the USIM matches the SUPI stored in the non-volatile memory; otherwise, they are retained.
Option 3: In a non-volatile memory of the Mobile Equipment (ME), but only usable if the SUPI from the USIM matches the SUPI stored in the non-volatile memory; else the User Equipment (UE) shall delete the 5GMM parameters.
Option 4: Directly on the User Equipment's (UE) removable storage, with no dependency on SUPI matching.
Explanation: This option correctly states that if the corresponding file for 5GMM parameters is not present on the USIM, these parameters are stored in a non-volatile memory within the Mobile Equipment (ME). Crucially, it accurately conveys the security measure that these parameters can only be utilized if the Subscriber Permanent Identifier (SUPI) retrieved from the USIM matches the SUPI stored alongside the 5GMM parameters in the ME's non-volatile memory. If this match is not achieved, the UE must delete the stored 5GMM parameters to ensure data integrity and security.