Question: What triggers the measurement of 'Number of successful reconfigurations of LTE DRB to LWIP DRB' in an E-UTRAN network?
Option 1: Receipt of a new LTE UE attachment request
Option 2: Completion of a handover from LTE to WLAN
Option 3: Receipt of RRCConnectionReconfigurationComplete message after transmitting RRCConnectionReconfiguration message
Option 4: Successful establishment of an EPS bearer
Explanation: The correct answer is based on how reconfiguration measurements are triggered in E-UTRAN. Specifically, for LTE DRB to LWIP DRB successful reconfigurations, the trigger is tied to the completion of the reconfiguration process, confirmed by receiving an RRCConnectionReconfigurationComplete message after sending an RRCConnectionReconfiguration message, ensuring only successfully completed reconfigurations are counted.