Clear PDN Call Flow

This section describes the Clear PDN call flow.

Clear PDN Call Flow
Clear PDN Call Flow Description

Step

Description

1

The OAM pod calls the CDL API with the filters.

CDL sends the notification message to REST EP.

2

The REST-EP converts this message to Clear Subscriber Request with a cause and sends Clear Subscriber to the SGW-Service pod.

Transaction-T1 started.

3-6

The SGW-Service pod sends Sx Modification Request to UPF through PFCP-EP.

The SGW-Service pod receives Sx Modification Response from UPF through PFCP-EP.

7

The SGW-Service pod sends the Delete Bearer Request to the S11-GTP-EP.

8

The SGW-Service pod sends the Delete Session Request to the S5-SGW-EGRESS-GTP-EP.

9

The S11-GTP-EP sends the Delete Bearer Request to MME.

10-12

The S5-SGW-EGRESS-GTP-EP sends the Delete Session Request to PGW.

The PGW sends the Delete Session Response to S5-SGW-EGRESS-GTP-EP.

The S5-SGW-EGRESS-GTP-EP forwards this request to the SGW-Service pod.

13-16

MME sends the Delete Bearer Response to S11-GTP-EP.

S11-GTP-EP forwards to the SGW-Service pod.

17, 18

PGW sends the Delete Session Response to S5-SGW-EGRESS-GTP-EP.

S5-SGW-EGRESS-GTP-EP forwards this request to the SGW-Service pod.

19-22

The SGW-Service pod sends the Sx Delete Request to PFCP-EP.

The PFCP-EP forwards the request to UPF.

UPF sends the Sx Delete Response to PFCP-EP, which it forwards it to the SGW-Service pod.