Usage Report in N4 Modify Response (Remove URR Scenario)
This section provides details on the usage report in the N4 Modify Response for the remove URR scenario.

Step |
Description |
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1 |
Both the PCRF and SMF exchange the Gx CCR and CCA messages.
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2 |
The SMF sends the N4 Session Modification Request with Remove URR list to CnPGW-U. |
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3 |
The CnPGW-U sends the N4 Session Modification Response to SMF. SMF processes and identifies the usage report for each bearer. |
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4 |
If the SMF removes one or multiple PCC Rules from a bearer, the SMF sends the CCA-U or Credit Control Answer - Terminate (CCR-T) message for each bearer in different Gy Diameter sessions to OCS. These sessions can have one or multiple MSCCs with Used Service Unit (USU). |
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5 |
The OCS sends the CCA-U or CCA-T message from the corresponding Gy Diameter session without quota to SMF. |