4.23.3 5GS mobility management via a satellite NG-RAN cell

For 5GS mobility management via a satellite NG-RAN cell the UE shall apply the value of the applicable NAS timer indicated in table 10.2.1 for access via a satellite NG-RAN cell.

NOTE 1: The applied NAS timer values are based on the current satellite NG-RAN access RAT type determined based on information from lower layers.

NOTE 1A: If the satellite NG-RAN access RAT type is NR(LEO), NAS timer extensions specific to satellite NG-RAN access are not applied.

The NAS timer value obtained by the UE is used as described in the appropriate procedure clause of this specification. The NAS timer value shall be calculated at start of a NAS procedure, and shall not be re-calculated until the NAS procedure is completed, restarted or aborted.

The access via a satellite NG-RAN cell by a UE is indicated to the AMF by lower layers and shall be stored by the AMF. When an AMF that supports access via satellite NG-RAN cells performs NAS signalling with a UE via satellite NG-RAN cells, the AMF shall calculate the value of the applicable NAS timer indicated in table 10.2.2 for access via a satellite NG-RAN cell.

NOTE 2: The applied NAS timer values are based on the current satellite NG-RAN access RAT type determined based on information from lower layers.

NOTE 2A: If the satellite NG-RAN access RAT type is NR(LEO), NAS timer extensions specific to satellite NG-RAN access are not applied.

The NAS timer value obtained by the network is used as described in the appropriate procedure clause of this specification. The NAS timer value shall be calculated at start of a NAS procedure and shall not be re-calculated until the NAS procedure is completed, restarted or aborted.