Question: What is the primary purpose of the HS-DSCH FDD Secondary Serving Information IE in UTRAN's Iur interface RNSAP signalling?
Option 1: To modify existing primary serving HS-DSCH configurations for User Equipment (UE) already connected to the network.
Option 2: To handle handover procedures between different Radio Network Subsystems (RNS).
Option 3: To initially add Secondary Serving HS-DSCH information to a UE's context, defining cell-specific parameters for the secondary serving HS-DSCH Radio Link.
Option 4: To manage Quality of Service (QoS) parameters for non-real-time services in the UTRAN network.
Explanation: The correct answer is Option 3 because the HS-DSCH FDD Secondary Serving Information IE is specifically utilized for the initial setup and configuration of secondary serving cells for High-Speed Downlink Shared Channel (HS-DSCH) in a UE's context, defining cell-specific parameters necessary for establishing an efficient secondary radio link.