Call Flows

This section describes the key call flows for this feature.

Delete from MME Call Flow
Delete from MME Call Flow Description

Step

Description

1

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

2

The S11-GTP-EP routes this message with TEID value to the Service-POD (SGW) which handles this session.

3

The Service-POD (SGW) sends the Sx Modification Request to PFCP-EP.

4

The PFCP-EP sends the Sx Modification Confirmation to the Service-POD (SGW).

5

The Service-POD (SGW) sends the Delete Session Request to the PGW through the S5-SGW-EGRESS-GTP-EP.

6

The Service-POD (SGW) receives the Delete Session Request from the PGW through the S5-SGW-EGRESS-GTP-EP.

7

The Service-POD (SGW) sends the Sx Delete Request to PFCP-EP.

8

The Service-POD (SGW) receives the Sx Delete Confirmation from PFCP-EP.

9

The Service-POD (SGW) sends Release TEID in ID-MGR to Node-Mgr.

10

The Service-POD (SGW) receives the Release TEID Confirmation from the Node-Mgr.

11

The Service-POD (SGW) sends the Delete Session Response to S11-GTP-EP.

12

The S11-GTP-EP sends the Delete Session Response to the MME.

13

The Service-POD (SGW) sends the Session Update or Delete in database message to the CDL.

Delete from PGW Call Flow
Delete from PGW Call Flow Description

Step

Description

1

The PGW/SMF sends the Delete Bearer Request to the S5-SGW-EGRESS-GTP-EP.

2

The S5-SGW-EGRESS-GTP-EP performs routing of this message with TEID value to the same pod that has hosted this session.

The S5-SGW-EGRESS-GTP-EP sends the Delete Bearer Request to the Service-POD (SGW).

3

The Service-POD (SGW) sends the Sx Modification Request to PFCP-EP and receives Sx Mod Cnf from it.

4

The PFCP-EP sends the Sx Modification Confirmation to the Service-POD (SGW).

5

The Service-POD (SGW) sends the Delete Bearer Request to the MME through the S11-GTP-EP.

6

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

7

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

8

The S11-GTP-EP forwards the Delete Bearer Response to the Service-POD (SGW).

9

The Service-POD (SGW) sends the Sx Delete Request to the PFCP-EP.

10

The Service-POD (SGW) receives the Sx Delete Confirmation from the PFCP-EP.

11

The Service-POD (SGW) sends the Release TEID in ID-MGR to the Node-Mgr.

12

The Service-POD (SGW) receives the Release TEID Confirmation from the Node-Mgr.

13

The S11-GTP-EP sends the Delete Bearer Response to the PGW through S5-SGW-EGRESS-GTP-EP.

14

The S5-SGW-EGRESS-GTP-EP sends the Delete Bearer Response to the PGW/SMF.

15

The Service-POD (SGW) sends the Session Update or Delete in database message to the CDL.