Question: How does the network authorize C2 communication for pairing of UAV and UAV-C when using separate PDN connectivity for USS communication and C2 communication?
Option 1: The network authorizes C2 communication during the EPS bearer context modification procedure.
Option 2: The network authorizes C2 communication during the PDN connectivity procedure using UUAA-SM.
Option 3: The network authorizes C2 communication during the EPS bearer context deactivation procedure.
Option 4: The network authorizes C2 communication using UUAA-SM during the PDN connectivity procedure, and releases PDN connectivity or C2 communication if pairing is revoked.
Explanation: According to the text, when using separate PDN connectivity for USS communication and C2 communication, the C2 communication with the UAV-C is authorized using UUAA-SM during the PDN connectivity procedure. If the pairing of UAV and UAV-C is revoked, the PDN connectivity or C2 communication shall be released by the network.