Section: 5.2.2.4.21 Actions upon reception of SIB19
Content: Upon receiving SIB19 in an NTN cell, the UE in RRC_CONNECTED shall: 1> start or restart T430 for serving cell with the timer value set to ntn-UlSyncValidityDuration for the serving cell from the subframe indicated by epochTime for the serving cell; 1> if SatSwitchWithReSync and t-Service are included, and the UE supports hard satellite switch with resynchronization; 2> if t-ServiceStart is included and the UE supports soft satellite switch with resynchronization: 3> perform the satellite switch with resynchronization as specified in 5.7.19 between the time indicated by t-ServiceStart and the time indicated by t-Service for the serving cell. 2> else: 3> perform the satellite switch with resynchronization as specified in 5.7.19 at the time indicated by t-Service for the serving cell. NOTE: UE should attempt to re-acquire SIB19 before the end of the duration indicated by ntn-UlSyncValidityDuration and epochTime by UE implementation.