Question: In a 5G network, when Lawful Interception (LI) is performed at the PDN Gateway for Intercept Related Information (IRI), how can IRI events requiring user plane packet access be generated if the second approach (DF3-based) is utilized?
Option 1: PDN 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 PDN Gateway-C.
Option 3: DF1 is responsible for generating IRI events based on user plane packets before delivering them to DF2.
Option 4: DF3 generates the IRI event based on the user plane packets and then delivers the event directly to DF2.
Explanation: This answer highlights the role of DF3 in generating IRI events from user plane packets and delivering them to DF2 when the second (DF3-based) approach is used for Intercept Related Information (IRI) generation, showcasing a nuanced understanding of 3GPP's LI architecture.