Question: Upon detecting a PCRF (Policy and Charging Rules Function) restart after a Gateway Control Session establishment, what action may a BBERF (Bearer Binding and Event Reporting Function) take regarding the associated PDN (Packet Data Network) connection, based on operator policy?
Option 1: Immediately send a Gateway Control Session modification request to the restarted PCRF.
Option 2: Temporarily suspend all new PDN connections for that APN (Access Point Name).
Option 3: Automatically upgrade the QoS (Quality of Service) for the affected PDN connection.
Option 4: Tear down the associated PDN connection, initiating a PDN connection deactivation procedure, except for Emergency and eMPS sessions.
Explanation: This is the correct action in case of a PCRF restart. The BBERF may choose to tear down the PDN connection (except for emergency and eMPS sessions) based on operator policy, leading to a cleanup of affected connections and prompting the UE to reinitiate connectivity for the same APN, ensuring consistency with network management and policy control post-PCRF restart.