Multi PDN Call X2 Handover SGW Relocation to cnSGW-C Call Flow
This section describes the Multi PDN Call X2 Handover SGW Relocation to cnSGW-C call flow.

Step |
Description |
---|---|
1 |
The MME sends the Create Session Request for (PDN1) with (OI = 1, MME Control TEID, PGW Control TEID, eNodeB Data TEID, PGW Data TEID) to the S11-GTP-EP. |
2 |
The MME sends the Create Session Request (PDN2) to the S11-GTP-EP. |
3 |
The S11-GTP-EP forwards the Create Session Request (PDN1) to the Service-Pod (SGW). |
4 |
The Service-Pod (SGW) requests for ID allocation (PDN1) to the Node-Mgr. |
5 |
The Node-Mgr responds with the Allocate Id Response (PDN1). |
6 |
The Service-Pod (SGW) performs the UPF selection. |
7 |
The Service-Pod (SGW) sends the Sx Session Establishment Request (PDN1) to the PFCP-EP. |
8 |
The PFCP-EP forwards the Sx Session Establishment Request (PDN1) to the User-Plane. |
9 |
The S11-GTP-EP sends the Create Session Request (PDN2) to the Service-Pod (SGW). |
10 |
The Service-Pod (SGW) sends the Sx Session Establishment Request (PDN2) to PFCP-EP. |
11 |
The PFCP-EP forwards the Sx Session Establishment Request (PDN2) to the User-Plane. |
12 |
The User-Plane sends the Sx Session Establishment Response (PDN1) to the PFCP-EP. |
13 |
The PFCP-EP sends the Sx Session Establishment Response (PDN1) to the Service-Pod (SGW). |
14 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN1) with the updated S5 SGW Control TEID and S5 SGW Data TEID to S5-GTP-EP. |
15 |
The S5-GTP-EP forwards the Modify Bearer Request (PDN1) to the PGW. |
16 |
The User-Plane sends the Sx Session Establishment Response (PDN2) to the PFCP-EP. |
17 |
The PFCP-EP forwards the Sx Session Establishment Response (PDN2) to the Service-Pod (SGW). |
18 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN2) with the updated S5 SGW Control TEID and S5 SGW Data TEID to the S5-GTP-EP. |
19 |
The S5-GTP-EP forwards the Modify Bearer Request (PDN2) to the PGW. |
20 |
The PGW sends the Modify Bearer Response (PDN1) to the S5-GTP-EP. |
21 |
The S5-GTP-EP forwards the Modify Bearer Response (PDN1) to the Service-Pod (SGW). |
22 |
The Service-Pod (SGW) sends the Create Session Response (PDN1) to the S11-GTP-EP. |
23 |
The Service-Pod (SGW) updates the PDN1 session to the CDL Endpoint. |
24 |
The S11-GTP-EP forwards the Create Session Response (PDN1) to the MME. |
25 |
The PGW sends the Modify Bearer Response (PDN2) to the S5-GTP-EP. |
26 |
The S5-GTP-EP forwards the Modify Bearer Response (PDN2) to the Service-Pod (SGW). |
27 |
The Service-Pod (SGW) sends the Create Session Response (PDN2) to the S11-GTP-EP. |
28 |
The Service-Pod (SGW) updates the PDN2 session to the CDL Endpoint. |
29 |
The S11-GTP-EP forwards the Create Session Response (PDN2) to the MME. |
30 |
The MME sends the Delete Session Request (PDN1) [SI=1] to the Old SGW. |
31 |
The Old SGW responds with the Delete Session Response to the MME. |