Question: In a 3GPP network utilizing PMIPv6 on S2a, what triggers the generation of a PMIP attach/tunnel activation event at the S-GW/PDN-GW during initial procedures?
Option 1: Receipt of an Initial Attach Request from the UE (User Equipment)
Option 2: Completion of Authentication and Authorization with the HSS (Home Subscriber Server)
Option 3: Detection of PDN Connectivity Activation or Initial Attach over PMIP
Option 4: Establishment of a New Bearer Context for QoS (Quality of Service)
Explanation: The correct answer directly relates to the specified behavior in the context of PMIPv6 on S2a interfaces. When the network detects either an Initial Attach or a PDN Connectivity Activation over PMIP at the S-GW/PDN-GW, it triggers the generation of a PMIP attach/tunnel activation event, crucial for lawful interception and network management, signaling a new connectivity context that may require monitoring or logging.