Question: What is the condition under which the measurement "Number of successful additions of LWIP DRB" is triggered?
Option 1: On receipt of RRCConnectionReconfiguration message
Option 2: On transmission of RRCConnectionReconfigurationComplete message
Option 3: When the UE initiates a packet switched traffic session
Option 4: On receipt of RRCConnectionReconfigurationComplete message corresponding to transmitted RRCConnectionReconfiguration message which triggered the measurement "Number of attempted additions of LWIP DRB"
Explanation: The correct answer is Option 4 because, according to the text, the measurement "Number of successful additions of LWIP DRB" is triggered when the eNodeB receives an RRCConnectionReconfigurationComplete message that corresponds to a previously transmitted RRCConnectionReconfiguration message. This condition indicates that the UE has successfully added an LWIP DRB.