Section: 16.18.2 Subscription-based Identification of Aerial UE
Content: Support for Aerial UE functions is stored in the user's subscription information in UDM. UDM transfers this information to the AMF during Registration, Service Request and Mobility Registration Update procedures. The Aerial UE subscription information can be provided by the AMF to the NG-RAN node via the NGAP INITIAL CONTEXT SETUP REQUEST message during the Registration, Mobility Registration Update and Service Request procedures. The subscription information can also be updated via the NGAP UE Context Modification procedure and NGAP Path Switch Acknowledge procedure. In addition, for Xn-based handover, the source NG-RAN node can include the Aerial UE subscription information in the XnAP HANDOVER REQUEST message and RETRIEVE UE CONTEXT RESPONSE message to the target NG-RAN node. For intra- and inter-AMF NG-based handover, the AMF provides the Aerial UE subscription information to the target NG-RAN node after the handover procedure.