Section: 4.13.7 Tracking Area handling
Content: For Cellular IoT over satellite access with moving cells, in order to ensure that each TA is Earth-stationary, even if the radio cells are moving across the Earth's surface, the E-UTRAN may change the TAC values that are broadcast in a cell's system information as the cell moves, as described in TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [37]. E-UTRAN may broadcast in a cell a single TAC per PLMN and change this TAC value as the cell moves. Alternatively, the E-UTRAN may broadcast in a cell more than one TAC for a PLMN and add or remove TAC values as the cell moves. The eNodeB provides either the single broadcast TAI or all broadcast TAIs corresponding to the Selected PLMN as described in TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [36] to the MME as part of the ULI, whenever the TAI is included in the S1-AP message as described in TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [36]. The eNodeB indicates, if known, also the TAI where the UE is geographically located. NOTE: The MME can take into account the TAI where the UE is geographically located, and the last visited TAI to generate a suitable Tracking Area List for the UE. The MME considers the UE to be in a forbidden area if the only TAI or all TAIs received from the eNodeB are forbidden based on subscription data. The UE considers it is in a cell within a forbidden area if the only TAI or all TAIs broadcast in this cell for the selected PLMN are forbidden. In a PLMN, the UE considers it is not in a cell within a forbidden area if at least one broadcast TAI for this PLMN in this cell is not forbidden. If the MME receives multiple TAIs from E-UTRAN and determines that some, but not all, TAIs in the received list of TAIs are forbidden by subscription or by operator policy, the MME shall send the forbidden TAI(s) to UE as described in clause 5.3.2, 5.3.3 and 5.3.4. The UE stores the TAI(s) in the appropriate Forbidden Area list and removes the TAI(s) from the TAI list.