Question: In a 3GPP-compliant network, which nodes are responsible for sending a ProSe Remote UE Report event when a ProSe Remote UE connects to or disconnects from the ProSe UE-to-NW Relay and is targeted for interception?
Option 1: MME (Mobility Management Entity) only
Option 2: S-GW (Serving Gateway) and PDN-GW (Packet Data Network Gateway) only
Option 3: eNodeB (Evolved Node B) and RNC (Radio Network Controller)
Option 4: MME, S-GW, and PDN-GW
Explanation: According to the specified security architecture for lawful interception in 3GPP networks, when a ProSe (Proximity Services) Remote UE's connection status with the ProSe UE-to-NW Relay changes and it is under interception, multiple network nodes are involved in reporting this event. These include the MME, which manages mobility; the S-GW, which handles packet forwarding; and the PDN-GW, which provides access to external networks. All three are responsible for sending the ProSe Remote UE Report when the conditions are met, ensuring comprehensive monitoring capability across different network segments.