Question: In E-UTRAN, when can a network request a UE (User Equipment) to report Inter-RAT (Radio Access Technology) measurements performed while in RRC_IDLE or RRC_INACTIVE mode?
Option 1: Only after the UE transitions to RRC_CONNECTED mode and completes the security activation process.
Option 2: Immediately after transmitting the Security Mode Command, before receiving the Security Mode Complete from the UE, or during connection resume from a suspended state.
Option 3: Solely via system information broadcast, without the option for dedicated measurement configuration in RRC Connection Release.
Option 4: Never directly; the UE autonomously decides when to report such measurements upon resuming a connection.
Explanation: This is correct because the network has flexibility in requesting Inter-RAT measurements. It can do so at two distinct times: immediately after sending the Security Mode Command (and thus before the UE confirms security activation), or during the process of resuming a connection from either a suspended RRC state or from RRC_INACTIVE, allowing for efficient use of resources and timely acquisition of measurement data.