Question: In E-UTRAN Access with PMIP-based S5/S8, where can lawful interception (LI) procedures be performed for dedicated bearer procedures, according to 3GPP security standards?
Option 1: Serving Gateway (S-GW)
Option 2: Packet Data Network Gateway (PDN-GW), for all scenarios
Option 3: Mobile Management Entity (MME), exclusively for PMIP-based S5/S8
Option 4: eNodeB, for direct radio access interception
Explanation: According to the specified security architecture for lawful interception in E-UTRAN with PMIP-based S5/S8, the S-GW is designated as the point where all dedicated bearer procedures can be intercepted, aligning with GTP-based S5/S8 requirements. The PDN-GW's involvement is limited to specific scenarios like PDN-disconnection initiated by itself, making S-GW the primary interception point for these procedures.