Question: What triggers the measurement of "Number of attempted reconfigurations of LTE DRB to LWA DRB" in an E-UTRAN network?
Option 1: Receipt of RRCConnectionReconfiguration message by the UE
Option 2: Transmission of RRCConnectionReconfigurationComplete message by the eNB
Option 3: Successful reconfiguration of LTE DRB to LWA DRB
Option 4: Receipt of RRCConnectionReconfigurationComplete message by the eNB, corresponding to the transmitted RRCConnectionReconfiguration message
Explanation: The correct answer is Option 4 because the measurement "Number of attempted reconfigurations of LTE DRB to LWA DRB" is triggered when the eNB receives the RRCConnectionReconfigurationComplete message, which corresponds to the transmitted RRCConnectionReconfiguration message. This indicates that the reconfiguration process has been initiated and completed successfully.