Question: In Network-initiated NBIFOM mode, when a PCRF determines that flows need to be moved from a source access to a target access within a multi-access IP-CAN session, what information must the PCRF include in the Charging-Rule-Install AVP sent to the PCEF?
Option 1: Only the updated PCC Rules within the Charging-Rule-Definition AVP(s)
Option 2: Only the new allowed access type within the IP-CAN-Type AVP
Option 3: Only the NBIFOM routing rule identifier in the Routing-Rule-Identifier AVP(s) within the Flow-Information AVP(s)
Option 4: All of the above: updated PCC Rules, new allowed access type, and NBIFOM routing rule identifier
Explanation: To facilitate seamless flow mobility from a source to a target access in Network-initiated NBIFOM mode, the PCRF must provide comprehensive instructions to the PCEF. This includes updating the PCC rules (Charging-Rule-Definition AVP) to reflect changes, specifying the new allowed access type (IP-CAN-Type AVP) for the flows, and assigning a unique identifier for the NBIFOM routing rule (Routing-Rule-Identifier AVP). All these elements are crucial for the PCEF to correctly derive and enforce the NBIFOM routing rules and perform bearer binding in the target access.