Section: 4.13.4 Verification of UE location
Content: In order to ensure that the regulatory requirements are met, the network may be configured to enforce that the selected PLMN is allowed to operate in the current UE location by verifying the UE location during EMM and ESM procedures. In this case, when the MME receives the User Location Information (ULI) for a UE using satellite access for Cellular IoT, the MME may decide to verify the UE location. If the MME determines based on the Selected PLMN ID and the identity of the cell serving this UE that it is not allowed to operate at the present UE location the MME should reject any NAS request with a suitable Cause value. If the UE is already registered to the network when the MME determines that the UE is not allowed to operate at the present UE location, the MME may initiate an explicit detach of the UE. The MME should not reject the request or detach the UE unless it has sufficiently accurate UE location information to determine that the UE is located in a geographical area where the PLMN is not allowed to operate. NOTE: The area where the PLMN is allowed to operate can be determined based on local regulations and licensing conditions. If the MME is not able to determine the UE location with sufficient accuracy to make a decision or if the received ULI is not sufficiently reliable, the MME proceeds with the Mobility Management or Session Management procedure and may initiate UE location procedure after the Mobility Management or Session Management procedure is complete, as specified in clause 9.1.17 of TS 23.271[ Functional stage 2 description of Location Services (LCS) ]  [57], to determine the UE location. The MME shall be prepared to detach the UE if the information received from the E SMLC indicates that the UE is registered to a PLMN that is not allowed to operate in the UE location. In case of a NAS procedure, the MME should either reject any NAS request targeted towards a PLMN that is not allowed to operate in the known UE location and indicate a suitable cause value, or accept the NAS procedure and initiate the Detach procedure once the UE location is known. In the Detach Request message to the UE, the MME shall include a suitable cause value.