Feature Description
Zero Accounting Loss for User Plane Function
Zero accounting loss feature is implemented on User Plane Function (UPF) so that accounting-data/billing loss is reduced from 18 seconds, which is the default checkpoint time from Active UPF to Standby UPF, or for the configured accounting checkpoint time.
This change in UPF is to support the Gz, Gy, VoGx, and RADIUS URRs. Only planned switchover is supported for zero accounting loss/URR data counters loss. This feature does not impact the current ICSR framework or the way checkpointing is done and recovered.
The Sx/N4 usage report is blocked during the “pending active state” till the chassis becomes Active.
Early PDU Recovery for UPF Session Recovery
Early PDU Recovery functionality overcomes the earlier limitation of Session Recovery feature wherein it did not prioritize the CRRs that were selected for recovery. All the CRRs were fetched from the AAAMgr and then the calls were recovered sequentially. The time taken to fetch all the CRRs was a major factor in the perceived delay during session recovery. When a failure occurred, the delay was sometimes very long if there were a lot of sessions in a Session Manager. Also, since the calls were recovered in no particular order, the idle sessions were sometimes recovered before active sessions.
Note | The Early PDU Recovery functionality can recover a maximum of 5 percent sessions. |
For more information, refer to the UCC 5G UPF Configuration and Administration Guide > 1:1 Redundancy chapter.