Question: In a network-initiated IP-CAN bearer establishment or modification for GBR bearers, how should the PCEF calculate the bearer's Guaranteed Bit Rate (GBR) when multiple PCC rules are active and bound to that bearer?
Option 1: Set the bearer's GBR to the lowest GBR of all PCC rules that are active and bound to that GBR bearer.
Option 2: Set the bearer's GBR to the sum of the GBRs of all PCC rules that are active and bound to that GBR bearer, without considering resource sharing.
Option 3: Set the bearer's GBR to the sum of the GBRs of all PCC rules that are active and bound to that GBR bearer. If a set of PCC Rules is subject to resource sharing, use the highest GBR from the set as input for calculating the bearer’s GBR.
Option 4: Set the bearer's GBR to the average GBR of all PCC rules that are active and bound to that GBR bearer.
Explanation: This is because, according to the specified behavior for network-initiated IP-CAN bearer establishment or modification, the PCEF should sum the GBRs of all applicable PCC rules for GBR bearers. Additionally, in cases where resource sharing among a set of PCC Rules is specified, using the highest GBR from the set ensures efficient resource allocation and prevents potential bottlenecks, aligning with the principles of QoS control in telecom networks.