Section: 6.3.13.2 Authentication and authorization of UAV
Content: The UE supporting UAS services may request a PDN connection for USS communication during attach and UE-requested PDN connectivity procedures (see clause 5.5.1 and 6.5.1). In the request of the PDN connection for USS communication, the UE provides CAA-level UAV ID to the network via the protocol configuration options and the network may decide to perform UUAA-SM procedure. If provided by the upper layers, a UE supporting UAS services may provide to the network the USS address via the protocol configuration options during attach and UE-requested PDN connectivity procedures so that the network may use the information to discover the USS. After successful UUAA-SM procedure, the network may initiate the re-authentication or re-authorization procedure for the UE supporting UAS services as a part of network-initiated EPS bearer context modification procedure. If UUAA-SM fails during the re-authentication or a re-authorization procedure, or if the revocation of UUAA is initiated by the network, then the associated PDN connection for USS communication is released.