Question: In a 3GPP network, when an IP-CAN bearer termination is triggered due to a PS (Packet Switched) to CS (Circuit Switched) handover, what action is taken by the BBERF in PMIP-based accesses regarding QoS rules?
Option 1: The BBERF ignores QoS rules for the terminated IP-CAN bearer.
Option 2: The BBERF updates QoS rules without specifying the handover reason.
Option 3: The BBERF initiates a new Gateway Control Session for the CS domain.
Option 4: The BBERF reports related QoS rules with a Rule-Failure-Code AVP set to PS_TO_CS_HANDOVER as part of the Gateway Control Session Modification procedure.
Explanation: In PMIP-based 3GPP accesses, when an IP-CAN bearer is terminated due to a PS to CS handover, the BBERF reports related QoS rules by including a Rule-Failure-Code AVP set to PS_TO_CS_HANDOVER as part of the Gateway Control Session Modification procedure, updating the network about the change in bearer status and its reason.