Question: Under what condition should a DRNC (Drift RNC) NOT initiate the UE Measurement Initiation procedure towards an SRNC (Serving RNC) in a UTRAN (UMTS Terrestrial Radio Access Network)?
Option 1: When the UE (User Equipment) is in idle mode.
Option 2: If the signalling bearer connection for the UE Context is not established.
Option 3: If a Prepared Reconfiguration already exists for the UE.
Option 4: When the SRNC is experiencing high load.
Explanation: This is because initiating a UE Measurement Initiation when a Prepared Reconfiguration exists would potentially lead to conflicts or inconsistencies in the network's management of the UE's context. A Prepared Reconfiguration implies that changes to the UE's configuration are already pending, and introducing new measurement requirements could interfere with these planned adjustments. Thus, to maintain operational coherence, the procedure should not be initiated under such conditions.