Usage Report with SoT – CCR-I Sent Without Quota Request During Initial Attach or Bearer Creation
This section provides details about the usage report with SoT where the CCR-I message is sent without the quota request during the initial attach or bearer creation.

Step |
Description |
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1 |
Both PCRF and SMF exchange the Gx Credit Control Request (CCR) and Credit Control Answer (CCA) messages from each other.
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2 |
SMF sends the CCR-I without quota request for each bearer in various Gy Diameter sessions to OCS. These sessions can have one or multiple MSCCs without quota request, which is one for each Rating Group and service ID. |
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3 |
OCS sends the CCA-I message from the corresponding Gy Diameter session to SMF. The Diameter session is without quota and triggers. |
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4 and 5 |
The PFCP and GTPP message exchange happens.
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6 |
The CnPGW-U sends the N4 Session Report Request to SMF with the SoT details. The SMF sends the N4 Session Report Response to CnPGW-U. |
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7 |
SMF sends the CCR-I message with quota request for each bearer in different Gy Diameter sessions to OCS. These sessions can have one or multiple MSCCs with Requested-Service-Unit (RSU) AVPs. |
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8 |
OCS sends the Credit Control Request - Update (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. |
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9 |
SMF sends the N4 Session Modification Request to CnPGW-U. This request includes details on the required URRs with quota. |
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10 |
The CnPGW-U sends the N4 Session Modification Response to SMF. |