Change Notification with ULI Change
This section describes the change notification request and the response call flow with ULI change.

Step |
Description |
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1 |
The MME sends a Change Notification Request (for ULI change) to SGW. |
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2 |
The SGW forwards a Change Notification Request to SMF. |
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3 |
The SMF sends a N4 Session Modification Request for query URR to UPF based on the event triggers armed.
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4 |
The UPF responds with a N4 Session Modification Response with Gy, and radius URR SMF based on Gy and radius configuration(enabled/disabled). |
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5 |
The SMF sends a Change Notification Response to SGW. |
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6 |
The SGW forwards a Change Notification Response to MME. |
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7 |
Based on the URRs received in N4 Modification Response, Gy, and radius signaling occurs. |
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8 |
The SMF sends a CCR-U to OCS and Radius Accounting Request to AAA. |
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9 |
The responds with a CCA-U and AAA with Radius Accounting Response. |
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10 |
The SMF sends a N4 Session Modification Request for update URR to UPF. |
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11 |
The UPF sends a N4 Session Modification Response to SMF. |
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12 |
If the event trigger arms, the SMF sends a CCR-U to the PCRF.
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13 |
The PCRF then sends a CCA-U to SMF. |
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14 |
Now, Bearer creation/update/deletion occurs based on Gx CCA-U contents. |