5.4.11.6 Support of Mobility Registration Update

A moving radio cell for NR satellite access may indicate support for one or more TACs for each PLMN. A UE that is registered with a PLMN may access a radio cell and does not need to perform a Mobility Registration Update procedure as long as at least one supported TAC for the RPLMN or equivalent to the RPLMN is part of the UE Registration Area. A UE shall perform a Mobility Registration Update procedure when accessing a radio cell where none of the supported TACs for the RPLMN or equivalent to the RPLMN are part of the UE Registration Area.

When indicating a last visited TAI in a Registration Update, a UE may indicate any TAI supported in a radio cell for the RPLMN or equivalent to the RPLMN for the last UE access prior to the Registration Update that is part of the UE Registration Area.