Question: In a 3GPP-compliant network, when Lawful Interception (LI) is performed at the Serving Gateway for Intercept Related Information (IRI), how can IRI events requiring user plane packet access be generated if the DF3-based approach is utilized?
Option 1: Serving Gateway-C directly generates IRI events from user plane packets and sends them to DF2 over the X2 reference point.
Option 2: SX3LIF collects user plane packets and generates IRI events, which are then forwarded to DF2 via Serving Gateway-U.
Option 3: DF3 generates IRI events based on the user plane packets and delivers these events directly to DF2, bypassing the need for SX3LIF to support the X2 reference point.
Option 4: The task is delegated to the Mobility Management Entity (MME), which then coordinates with DF2 for event delivery.
Explanation: This answer is correct because, when using the DF3-based approach for generating IRI events that require access to user plane packets, DF3 directly generates these events from the user plane packets and delivers them to DF2, bypassing the need for SX3LIF to support the X2 reference point. The other options misrepresent the roles of network elements or the process flow in this specific interception scenario.