Question: In a 5G network, when is the 'Successful UE-associated logical NG-connection establishment from gNB to AMF' measurement incremented for a specific RRCSetupRequest establishment cause?
Option 1: Upon receipt of the RRCSetupRequest message by the gNB from the UE.
Option 2: When the AMF sends an INITIAL UE MESSAGE to the gNB for a new UE-associated logical NG-connection.
Option 3: On receipt by the gNB of the first successful message from AMF following the INITIAL UE MESSAGE on a UE-associated logical NG-connection.
Option 4: After the UE completes the attachment process to the 5GS network.
Explanation: This is correct because the measurement is incremented when the gNB receives the first message from the AMF that succeeds the INITIAL UE MESSAGE on a UE-associated logical NG-connection, indicating a successful establishment of the logical connection for the specific RRCSetupRequest cause.