Usage Report in N4 Modify Response (Query URR Scenario)
This section provides details on the usage report in the N4 Modify Response, for the trigger event, in the Query URR scenario.

Step |
Description |
---|---|
1 |
The SMF detects a Charging condition event and is armed for one or more specific MSCCs of all the bearers. Then, SMF creates a list of Query URR for the bearers that are armed. After the creation of this list, the SMF sends the N4 Session Modification Request with the Query URR list to the CnPGW-U. |
2 |
The CnPGW-U sends the N4 Session Modification Response to SMF with the usage report. SMF processes and identifies the usage report for each bearer. |
3 |
The SMF sends the CCR-U message for each bearer in different Gy Diameter sessions to OCS. These sessions can have one or multiple MSCCs, which is one for each Rating Group and service ID. |
4 |
The OCS sends the CCA-U message from the corresponding Gy Diameter session to SMF. The Diameter session includes details, such as quota and triggers for each Rating Group and Service ID. |
5 |
The SMF sends the N4 Session Modification Request to CnPGW-U. This request includes details on the required URRs with quota. |
6 |
The CnPGW-U sends the N4 Session Modification Response to SMF. |