Question: In a scenario where Resource Sharing (ResShare) is supported by both PCEF and PCRF, how does the PCEF determine the common Guaranteed Bit Rate (GBR) value for PCC rules bound to the same bearer and sharing key value?
Option 1: The PCEF uses the lowest GBR value among the PCC rules as input for calculating the common GBR value.
Option 2: The PCEF calculates the average GBR value of all relevant PCC rules for determining the common GBR.
Option 3: The PCEF uses the highest GBR value among those PCC rules, considering uplink and downlink GBR values separately.
Option 4: The PCEF relies on a predefined default GBR value for all shared resource scenarios.
Explanation: According to the ResShare feature's logic, when multiple PCC rules share resources on the same bearer, the PCEF ensures sufficient bandwidth allocation by selecting the highest GBR value from among these rules. This approach guarantees that the common resource pool can accommodate the most demanding service's requirements, whether in uplink or downlink, thus ensuring Quality of Service (QoS) for all shared services.