Question: Upon revocation of Multimedia Priority Service (MPS) for Dynamic Tariff Scheme (DTS), how does the Policy and Charging Rules Function (PCRF) handle the Allocation and Retention Priority (ARP) and QoS Class Identifier (QCI) for already installed dynamic PCC rules bound to the default bearer, assuming Rule-Bound-to-Default-Bearer feature is supported?
Option 1: The PCRF always resets ARP and QCI to their original values before MPS invocation.
Option 2: The PCRF leaves ARP and QCI unchanged for those specific rules upon revocation.
Option 3: The PCRF sets ARP and QCI based on the last known configuration from another service that modified these values during MPS for DTS enablement.
Option 4: The PCRF sets ARP and QCI to appropriate values according to its decision, considering potential modifications by other services during MPS for DTS enablement.
Explanation: Upon revocation of MPS for DTS, the PCRF's handling of ARP and QCI for affected PCC rules involves setting these parameters to values determined by the PCRF's decision. This approach accommodates scenarios where other services may have altered these values while MPS for DTS was enabled, necessitating a nuanced adjustment rather than a simple reset or leaving them unchanged. This ensures that the network resources are allocated appropriately based on the current service requirements and priorities.