Current Downlink Data Notification Handling Call Flow
This section describes the Current Downlink Data Notification Handling call flow.

Step |
Description |
---|---|
1 |
UPF sends a Sx Session Report Request with DLDR or ERIR to UDP-Proxy. |
2 |
UDP-Proxy sends the Sx Session Report Request with DLDR or ERIR to PFCP. |
3 |
PFCP sends the Sx Session Report Request with DLDR or ERIR to SGW-SRV. |
4 |
The SGW-SRV sends the Downlink Data Notification (DDN) to GTP-S11. |
5 |
SGW-SRV sends Sx Session Report Response to PFCP. |
6 |
PFCP sends the Sx Session Report Response to UDP-Proxy. |
7 |
UDP-Proxy sends the Sx Session Report Response to UPF. |
8 |
GTP-S11 sends the DDN Notification to MME. |
9 |
MME initiates a paging for UE and sends the DDN Acknowledgment to GTP-S11. |
10 |
GTP-S11 sends the DDN Acknowledgment to SGW-SRV. |
11 |
When the paging fails, MME sends the DDN Failure Indication to GTP-S11. |
12 |
GTP-S11 sends the DDN Failure Indication to SGW-SRV. |