5.2.1 UUAA Model

23.2563GPPRelease 17Stage 2Support of Uncrewed Aerial Systems (UAS) connectivity, identification and trackingTS

The following applies for UUAA for a UAV:

– UUAA-MM is optional and performed at 5GS registration based on operator’s policy. If required by the operator, UUAA-MM is performed if the UAV has an aerial UE subscription in the Access and Mobility Subscription Data and provides the CAA-Level UAV ID in the Registration Request message. If UUAA-MM is not performed, the UAV shall be authenticated by UUAA-SM during the PDU session establishment procedure for UAS service.

– UUAA-SM is in 5GS performed at PDU session establishment to a subscribed DNN applicable for UAS services if the UAV provides the CAA-Level UAV ID in the PDU Session Establishment Request message. Whether the DNN is applicable for UAS services is determined by the aerial service indication being set for the DNN in the Session Management Subscription Data.

– UUAA-SM is in EPS performed at PDN Connection Establishment when activating a PDN Connection to a subscribed APN applicable for UAS service if the UAV provides the CAA-Level UAV ID in the ESM container. Whether the APN is applicable for UAS services is determined by the aerial service indication being set for the corresponding DNN in the Session Management Subscription Data (fetched from UDM triggered by CAA-Level UAV ID being provided in request).

– UUAA-SM may be performed to re-authenticate the UAV or to reauthorize at PDU session modification or EPS bearer modification (e.g. in case of C2 authorization or flight plan authorization change) if the UE includes CAA-Level UAV ID and a UUAA Aviation Payload.

NOTE: If the network is configured to perform UUAA at registration, UAV has not provided CAA-Level UAV ID and the UE has aerial subscription, then the AMF can allow the UAV to register as a normal UE. If the network is configured to perform UUAA at PDU Session Establishment, the UE has not provided CAA-Level UAV ID and the SM subscription data indicates that UUAA-SM to be performed, the SMF rejects the PDU Session Establishment request.