This solution addresses the key issue #2: Pairing authorization for UAV and UAVC.
This solution assumes UAV and UAVC are equipped with SUPI and credentials from PLMN. The pairing authorization is performed after UAV or UAVC is authenticated by 3GPP systems through Primary authentication. It is performed when UAV is being authenticated/authorized, or after it has been authenticated/authorized by USS/UTM.
This solution addresses the key issue #2.
In this solution, pairing information is assumed to be pre-provisioned, 1) provisioned at USS/UTM; 2) provisioned at UAV/UAVC (the provisioning is not scope of 3GPP). Pairing authorization is performed at USS/UTM after UAV is authenticated by PLMN. Pairing authorization is sent to PLMN with associated IDs (e.g. GPSI and/or UAV IDs).
This solution supports pairing revocation triggered by USS/UTM at any time.
Further evaluation on SMF enforcing authorization of C2 traffic is needed.