Question: For a UE connected to 5GC, which of the following conditions must be met for initiating UP-EDT (User Plane Early Data Transmission)?
Option 1: Upper layers request establishment of an RRC connection, and SystemInformationBlockType2 includes cp-EDT-5GC.
Option 2: Upper layers request resumption of an RRC connection, UE supports UP-EDT, SystemInformationBlockType2 includes up-EDT-5GC, and the UE has a stored value of nextHopChainingCount from the previous suspend procedure.
Option 3: The establishment cause is mo-Data, and SystemInformationBlockType2 (SystemInformationBlockType2-NB in NB-IoT) includes edt-Parameters.
Option 4: EDT fallback indication has been received from lower layers for this resumption procedure, and the UE supports UP-EDT.
Explanation: For a UE connected to 5GC, initiating UP-EDT requires specific conditions to be fulfilled. These include the upper layers requesting the resumption of an RRC connection, the UE supporting UP-EDT, the presence of up-EDT-5GC in SystemInformationBlockType2, and the UE having stored the nextHopChainingCount value from the preceding suspend procedure. This ensures that the network and UE are both prepared for the efficient, early transmission of user plane data upon connection resumption.