Question: In a 5G network, when measuring the distribution of UL packet delay between PSA UPF and UE (including D1), what is a prerequisite for this measurement to be applicable?
Option 1: The NG-RAN and PSA UPF must support the same QoS profiles.
Option 2: The UE must be in RRC Connected state.
Option 3: The PSA UPF and NG-RAN must be time synchronized.
Option 4: The SMF must have initiated a PDU Session Establishment procedure for QoS monitoring.
Explanation: This measurement's accuracy relies on synchronized timestamps between the PSA UPF and NG-RAN to calculate the delay correctly. Therefore, time synchronization between these entities is crucial for this specific measurement to be applicable.