Question: What triggers the measurement of normally released calls (QCI1 E-RAB) initiated by MME in RLF detected conditions?
Option 1: Reception of E-RAB Release Command for QCI1 with “Cause” equal to “Normal Release” from MME when RLF is detected on eNB side.
Option 2: Detection of RLF on UE side within a predefined time interval (e.g. 1 second).
Option 3: Initiation of a new call by the UE in QCI1 E-RAB conditions.
Option 4: Handover of an ongoing call from one eNB to another.
Explanation: The measurement is triggered when MME sends an E-RAB Release Command for QCI1 with “Cause” equal to “Normal Release” and RLF is detected on the eNB side within a predefined time interval, indicating that the call was normally released due to radio link failure.