Question: When Multimedia Priority Services (MPS) for DTS are invoked or revoked, how does the Policy and Charging Rules Function (PCRF) handle the provision of Quality of Service (QoS) information for the default bearer in relation to already installed dynamic PCC/QoS rules?
Option 1: The PCRF always provisions new QoS Rules to the Bearer Binding and Event Reporting Function (BBERF), overriding existing ones.
Option 2: The PCRF derives new QoS Rules from applicable Policy and Charging Control (PCC) Rules but only for non-default bearers.
Option 3: The provision of QoS information is skipped for default bearers when MPS for DTS is invoked or revoked.
Option 4: The PCRF can derive the QoS Rules from the applicable PCC Rules and provision the BBERF with these derived QoS Rules for already installed dynamic rules bound to the default bearer.
Explanation: This option correctly reflects the nuanced handling of QoS information by the PCRF during invocation or revocation of MPS for DTS, specifically for existing dynamic PCC/QoS rules tied to the default bearer. It highlights the PCRF's ability to derive and provision applicable QoS Rules without necessarily overriding or skipping them, ensuring seamless integration with existing network configurations.