Question: Under what condition is the Radio Link Addition procedure **not** initiated for a UE already connected to a DRNS (Destination Radio Network Subsystem)?
Option 1: When the UE has no established Radio Links (RLs) with the DRNS.
Option 2: During handover procedures from another RNS (Radio Network Subsystem).
Option 3: If a Prepared Reconfiguration already exists for the concerned UE Context.
Option 4: When adding only a DSCH (Downlink Shared Channel) without a USCH (Uplink Shared Channel).
Explanation: The correct answer is Option 3 because, according to the specifications, the Radio Link Addition procedure shall not be initiated if a Prepared Reconfiguration exists for the UE Context in question. This ensures that ongoing reconfiguration processes are completed before new resources are allocated, preventing potential conflicts or misallocations of network resources.