Multi-PDN S1 Handover SGW Relocation to Service-Pod (SGW) Call Fow
This section describes the Multi-PDN S1 Handover SGW Relocation to Service-Pod (SGW) call flow.

Step |
Description |
---|---|
1 |
The MME sends a Create Session Request (PDN1) with (OI = 0, MME Control TEID, PGW Control TEID, and PGW Data TEID) to the S11-GTP-EP. |
2 |
The MME sends the Create Session Request (PDN2) with (OI = 0, MME Control TEID, PGW Control TEID, and PGW Data TEID) to the S11-GTP-EP. |
3 |
The S11-GTP-EP sends the Create Session Request (PDN1) to the Service-Pod (SGW). |
4 |
The Service-Pod (SGW) requests ID allocation (PDN1) to the Node-Mgr. |
5 |
The Node-Mgr responds with the Allocate ID Response (PDN1) to the Service-Pod (SGW). |
6 |
The Service-Pod (SGW) performs the UPF selection. |
7 |
The Service-Pod (SGW) triggers the Sx Session Establishment Request (PDN1) to the PFCP-EP. |
8 |
The PFCP-EP forwards a Sx Session Establishment Request (PDN1) to the User-Plane. |
9 |
The Service-Pod (SGW) receives the Create Session Request (PDN2) from the S11-GTP-EP. |
10 |
The Service-Pod (SGW) sends a Sx Session Establishment Request (PDN2) to the PFCP-EP. |
11 |
The PFCP-EP forwards the Sx Session Establishment Request (PDN2) to the User-Plane. |
12 |
The User-Plane responds with the Sx Session Establishment Response (PDN1) to the PFCP-EP. |
13 |
The PFCP-EP forwards the Sx Session Establishment Response (PDN1) to the Service-Pod (SGW). |
14 |
The Service-Pod (SGW) sends the Create Session Response (PDN1) to the S11-GTP-EP. |
15 |
The Service-Pod (SGW) updates the PDN1 session to the CDL Endpoint. |
16 |
The S11-GTP-EP forwards the Create Session Response (PDN1) to the MME. |
17 |
The User-Plane responds with the Sx Session Establishment Response (PDN2) to the PFCP-EP. |
18 |
The PFCP-EP forwards the Sx Session Establishment Response (PDN2) to the Service-Pod (SGW). |
19 |
The Service-Pod (SGW) sends the Create Session Response (PDN2) to the S11-GTP-EP. |
20 |
The Service-Pod (SGW) updates the PDN2 session to the CDL Endpoint. |
21 |
The S11-GTP-EP forwards the Create Session Response (PDN2) to the MME. |
22 |
The MME sends a Modify Bearer Request (PDN1) to the S11-GTP-EP. |
23 |
The MME sends the Modify Bearer Request (PDN2) to the S11-GTP-EP. |
24 |
The S11-GTP-EP forwards the Modify Bearer Request (PDN1) to the Service-Pod (SGW). |
25 |
The Service-Pod (SGW) sends a Sx Modify Request (PDN1) to the PFCP-EP. |
26 |
The PFCP-EP forwards the Sx Modify Request (PDN1) to the User-Plane. |
27 |
The S11-GTP-EP sends the Modify Bearer Request (PDN2) to the Service-Pod (SGW). |
28 |
The Service-Pod (SGW) sends a Sx Modify Request (PDN2) with the updated DL FAR OCR and UL PDR OHR to the PFCP-EP. |
29 |
The PFCP-EP forwards the Sx Modify Request (PDN2) to the User-Plane. |
30 |
The User-Plane responds with the Sx Modify Response (PDN1) to the PFCP-EP. |
31 |
The PFCP-EP forwards the Sx Modify Response (PDN1) to the Service-Pod (SGW). |
32 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN1) with the updated S5 SGW Control TEID and S5 SGW Data TEID to the S5-GTP-EP. |
33 |
The S5-GTP-EP forwards the Modify Bearer Request (PDN1) to the PGW. |
34 |
The User-Plane sends the Sx Modify Response (PDN2) to the PFCP-EP. |
35 |
The PFCP-EP forwards the Sx Modify Response (PDN2) to the Service-Pod (SGW). |
36 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN2) to the S5-GTP-EP. |
37 |
The S5-GTP-EP forwards the Modify Bearer Request (PDN2) to the PGW. |
38 |
The PGW responds with the Modify Bearer Response (PDN1) to the S5-GTP-EP. |
39 |
The S5-GTP-EP forwards the Modify Bearer Response (PDN1) to the Service-Pod (SGW). |
40 |
The Service-Pod (SGW) sends the Modify Bearer Response (PDN1) to the S11-GTP-EP. |
41 |
The Service-Pod (SGW) updates the PDN1 session to the CDL Endpoint. |
42 |
The S11-GTP-EP forwards the Modify Bearer Response (PDN1) to the MME. |
43 |
The PGW responds with the Modify Bearer Response (PDN2) to the S11-GTP-EP. |
44 |
The S5-GTP-EP forwards the Modify Bearer Response (PDN2) to the Service-Pod (SGW). |
45 |
The Service-Pod (SGW) sends the Modify Bearer Response (PDN2) to the S11-GTP-EP. |
46 |
The Service-Pod (SGW) updates the PDN2 session to the CDL Endpoint. |
47 |
The S11-GTP-EP forwards the Modify Bearer Response (PDN2) to the MME. |
48 |
The MME triggers the Delete Session Request [SI=1] to Old SGW. |
49 |
The Old SGW deletes the session and responds with the Delete Session Response. |