Question: What is the primary purpose of implementing SIPTO at Iu-PS Function in UTRAN, if supported?
Option 1: To offload certain PS (Packet Switched) Radio Access Bearers (RABs) from the Core Network (CN) during RAB setup.
Option 2: To enhance the security of signaling between the Radio Network System (RNS) and User Equipment (UE).
Option 3: To improve the quality of service for Circuit Switched (CS) voice calls over the Iu-PS interface.
Option 4: To reduce the latency in data transmission for PS services within the RNS.
Explanation: SIPTO at Iu-PS Function is designed to provide a mechanism for offloading specific Packet Switched Radio Access Bearers from the Core Network during the setup phase, thereby optimizing resource utilization and potentially improving network efficiency. This aligns with the concept of selective IP traffic offload, which aims to reduce the load on core network elements by diverting certain types of traffic at an earlier point in the network architecture.