Section: 5.4.11.7 Tracking Area handling for NR satellite access
Content: In the case of NR 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 NG-RAN may change the TAC values that are broadcast in a cell's system information as the cell moves, as described in TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [27] and TS 38.331[ NR; Radio Resource Control (RRC); Protocol specification ]  [28]. NG-RAN may broadcast in a cell a single TAC per PLMN and change that TAC value as the cell moves. Alternatively, the NG-RAN may broadcast in a cell more than one TAC for a PLMN and add or remove TAC values as the cell moves. The NG-RAN provides either the single broadcast TAI or all broadcast TAIs corresponding to the Selected PLMN as described in TS 38.413[ NG-RAN; NG Application Protocol (NGAP) ]  [34] to the AMF as part of the ULI, whenever the ULI is included in the NGAP message as described in TS 38.413[ NG-RAN; NG Application Protocol (NGAP) ]  [34]. The NG-RAN indicates, if known, also the TAI where the UE is geographically located. NOTE: The AMF may take the TAI where the UE is geographically located into account to generate a suitable Registration Area for the UE.