Question: In a scenario where a PDN-GW provides a Gn/Gp interface for interworking with an SGSN, how does the PDN-GW behave from a Lawful Interception (LI) perspective towards the involved SGSN?
Option 1: The PDN-GW acts as an MME, adapting its LI functions to match the SGSN's requirements.
Option 2: The PDN-GW maintains its native functionality, ignoring GGSN-specific LI requirements.
Option 3: The PDN-GW acts as a GGSN, applying all GGSN-specified LI requirements in addition to its own.
Option 4: The PDN-GW temporarily suspends LI functions during handovers between E-UTRAN and 2G/3G accesses.
Explanation: When a PDN-GW provides a Gn/Gp interface for interworking with an SGSN, it effectively assumes the role of a GGSN from a Lawful Interception (LI) standpoint. This means that, in addition to its standard LI requirements as a PDN-GW, it must also adhere to all LI specifications applicable to a GGSN, ensuring seamless and compliant interception across different network accesses.