DDN Handling with Internal DDN Delay Timer Call Flow
This section describes the DDN Handling with Internal DDN Delay Timer call flow.

Step |
Description |
---|---|
1 |
UPF sends a Sx Session Report Request with DLDR/ERIR to UDP-Proxy. |
2 |
UDP-Proxy sends the Sx Session Report Request with DLDR/ERIR (BGIPC Call) to Protocol. |
3 |
Protocol sends the Sx Session Report Request with DLDR/ERIR to SGW-SRV. |
4 |
SGW-SRV sends a Sx Session Report Response to Protocol. |
5 |
Protocol sends the Sx Session Report Request to UDP-Proxy. |
6 |
UDP-Proxy sends the Sx Session Report Request to UPF. |
7 |
SGW-SRV sends the Downlink Data Notification to GTP-S11. |
8 |
GTP-S11 sends the Downlink Data Notification to UDP-Proxy. |
9 |
UDP-Proxy sends the Downlink Data Notification to MME. |
10 |
After MME initaites paging for UE, MME sends the Downlink Data Notification Acknowledgement to UDP-Proxy. |
11 |
UDP-Proxy sends the Downlink Data Notification Acknowledgement to GTP-S11. |
12 |
GTP-S11 sends the Downlink Data Notification Acknowledgement to SGW-SRV. |
13 |
MME sends the Modify Bearer Request for DATA PDN to UDP-Proxy. |
14 |
UDP-Proxy sends the Modify Bearer Request for DATA PDN to GTP-S11. |
15 |
GTP-S11 sends the Modify Bearer Request for DATA PDN to SGW-SRV. |
16 |
SGW-SRV sends the Modify Bearer Request for DATA PDN to Protocol. |
17 |
Protocol and UPF processes the Sx Modify Bearer Request for DATA PDN. |
18 |
Protocol sends Sx Modify Response for DATA PDN to SGW-SRV. |
19 |
SGW-SRV sends Sx Modify Response for DATA PDN to GTP-S11. |
20 |
GTP-S11 sends Sx Modify Response for DATA PDN to UDP-Proxy. |
21 |
UDP-Proxy sends Sx Modify Response for DATA PDN to MME. |