Question: What happens to the authorized bitrates (e.g., GBR, MBR) provisioned by the PCRF for an IP CAN bearer if the SGSN does not support a QoS upgrade?
Option 1: The PCRF can provision higher authorized bitrates than requested for future IP-CAN session modifications.
Option 2: The PCRF must provision lower authorized bitrates than requested to ensure bearer stability.
Option 3: The setting of authorized bitrates remains unchanged, regardless of the QoS upgrade support.
Option 4: The PCRF shall not provision authorized bitrates higher than the requested bitrates for the IP CAN bearer.
Explanation: If the SGSN does not support a QoS upgrade, the PCRF is restricted from provisioning authorized bitrates (like GBR and MBR) that exceed the initially requested bitrates for the IP CAN bearer, ensuring alignment with the SGSN's capabilities and preventing potential service disruptions.