5.3.19A.1 UE not operating in SNPN access operation mode

The following requirements apply for a UE that is configured to use timer T3245 (see 3GPP TS 24.368 [17] or 3GPP TS 31.102 [22]).

When the UE adds a PLMN identity to the "forbidden PLMN list" or sets the USIM as invalid for 5GS services for 3GPP access or non-3GPP access, and timer T3245 (see 3GPP TS 24.008 [12]) is not running, the UE shall start timer T3245 as specified in 3GPP TS 24.008 [12], clause 4.1.1.6.

Upon expiry of the timer T3245, the UE shall erase the "forbidden PLMN list" and "forbidden PLMNs for GPRS service" list and set the USIM to valid for 5GS services for 3GPP access and non-3GPP access, if the UE is not registered for disaster roaming services. When the lists are erased, the UE performs cell selection according to 3GPP TS 38.304 [28] or 3GPP TS 36.304 [25C].

NOTE: As an implementation option, the UE erases the "forbidden PLMN list" and "forbidden PLMNs for GPRS service" when the UE determines that the disaster condition has ended as specified in 3GPP TS 23.122 [5] and the lists were not deleted upon the timer T3245 expiry.

If the UE is switched off when the timer T3245 is running, the UE shall behave as follows when the UE is switched on and the USIM in the UE remains the same:

• let t1 be the time remaining for T3245 timeout at switch off and let t be the time elapsed between switch off and switch on. If t1 is greater than t, then the timer shall be restarted with the value t1 – t. If t1 is equal to or less than t, then the UE will follow the behaviour as defined in the paragraph above upon expiry of the timer T3245. If the UE is not capable of determining t, then the UE shall restart the timer with the value t1.