Question: How does a Policy and Charging Rules Function (PCRF) update a set of existing time-conditioned policy information for an Access Point Name (APN) and/or default Evolved Packet System (EPS) bearer Quality of Service (QoS) in a Policy and Charging Enforcement Function (PCEF)?
Option 1: By sending an incremental update with only the changed Conditional-Policy-Information Attribute Value Pairs (AVPs)
Option 2: By sending a complete set of new Conditional-Policy-Information AVPs, replacing all previously provided time-conditioned policies
Option 3: Through direct interaction with the PCEF at the execution time specified in the Execution-Time AVP
Option 4: By excluding all Conditional-Policy-Information AVPs and only updating the QoS-Information AVP
Explanation: To ensure seamless policy enforcement without gaps or overlaps, when updating a set of time-conditioned policies for APN and/or default EPS bearer QoS, the PCRF must provide a comprehensive update. This is achieved by sending a complete new set of Conditional-Policy-Information AVPs, which then replaces all previously communicated time-conditioned policies in the PCEF. This approach guarantees that only the intended policies are enforced at any given time, avoiding potential conflicts or service disruptions.