Question: In a scenario where a UE moves from one RCAF's (Resource and Congestion Awareness Function) geographical area to another, how does the PCRF (Policy and Charging Rules Function) handle potential congestion indications for that UE from multiple RCAF nodes?
Option 1: The PCRF immediately updates its records with the new RCAF's congestion status without notifying the previous RCAF.
Option 2: The PCRF maintains the last RCAF indicating congestion and only updates this when a new RCAF reports congestion, then explicitly releases context at the old RCAF.
Option 3: The PCRF aggregates all congestion reports from different RCAF nodes for a UE and applies a collective decision based on these reports.
Option 4: The PCRF relies on the UE to report its location change and associated RCAF, triggering an update in the PCRF's records.
Explanation: This is correct because it ensures consistent operation for UE mobility by maintaining a single point of reference (the last RCAF indicating congestion) until explicitly updated. This approach prevents potential conflicts or misunderstandings about a UE's congestion status as it moves between geographical areas served by different RCAF nodes, aligning with efficient network resource management and policy enforcement.