Question: When a PCRF (Policy and Charging Rules Function) performs bearer binding for a service data flow with a GBR (Guaranteed Bit Rate) QCI (QoS Class Identifier), what is a key consideration for the assigned GBR value?
Option 1: It must always match the maximum capacity of the User Equipment (UE).
Option 2: It should be based solely on the QoS requirements of the application.
Option 3: It shall be within the limit supported by the serving network (e.g., GERAN/UTRAN).
Option 4: It is determined by the type of service data flow (e.g., video, voice).
Explanation: This is correct because when the PCRF assigns a GBR value for a service data flow with a GBR QCI, it must ensure that the assigned rate does not exceed what the serving network (such as GERAN or UTRAN) can support. This prevents potential bearer rejection due to insufficient network resources, thus maintaining efficient network operation and user experience.