Question: In a UTRAN Iu interface setup with SIPTO at the Local Network (SIPTO@LN) and a standalone Gateway (GW), what is the primary characteristic of how user plane traffic is handled?
Option 1: The user plane traffic is always routed through the mobile operator's core network for billing purposes.
Option 2: The user plane traffic bypasses the mobile operator's core network, accessing a defined IP network directly via the standalone GW.
Option 3: The standalone GW in the local network only handles control plane signaling, not user plane traffic.
Option 4: SIPTO@LN requires a dedicated S-GW and L-GW for each subscriber, increasing network complexity.
Explanation: This is correct because SIPTO@LN is designed to provide direct access to defined IP networks (like the Internet) without the need for user plane traffic to traverse the mobile operator's core network. The use of a standalone GW facilitates this direct access, enhancing efficiency and reducing latency for certain types of traffic.