Question: In a 3GPP network utilizing PMIPv6 on S2a, when a Detach or PDN disconnection is detected at the Serving/PDN Gateway, what action is triggered towards the Lawful Interception Function (DF2)?
Option 1: A new IP-CAN session is established for further monitoring.
Option 2: A PMIP detach/tunnel deactivation event is generated and delivered to DF2 if available.
Option 3: The PDN-GW initiates a re-authentication procedure for the UE.
Option 4: The S-GW updates the UE's location without notifying DF2.
Explanation: In the context of lawful interception, when a Detach or PDN disconnection occurs (indicating a change in the user's connectivity), the network must notify the interception function to ensure continuity or termination of the intercept as appropriate. Generating a PMIP detach/tunnel deactivation event and delivering it to DF2 (the Lawful Interception Function for Content) is crucial for managing the intercept in accordance with legal requirements, thus making Option 2 the correct action in this scenario.