Inter MME Handover with Multi-PDN Handling (With PGW Interaction) Call Flow
This section describes the Inter MME Handover with Multi-PDN Handling (With PGW Interaction) call flow.

Step |
Description |
---|---|
1 |
The New-MME sends the Modify Bearer Request for (PDN1) with the updated eNodeB FTEID, new MME control FTEID, and new serving network to the S11-GTP-EP. |
2 |
The New-MME sends the Modify Bearer Request for (PDN2) with the updated eNodeB FTEID, new MME control FTEID, and new serving network to the S11-GTP-EP. |
3 |
The S11-GTP-EP sends the Modify Bearer Request (PDN1) to the cnSGW-C. |
4 |
The cnSGW-C sends the Sx Modify Request (PDN1) with the updated DL FAR OCR and UL PDR OHR to the PFCP-EP. |
5 |
The PFCP-EP forwards the Sx Modify Request for (PDN1) to the User-Plane. |
6 |
The S11-GTP-EP sends the Modify Bearer Request (PDN2). |
7 |
The Service-Pod (SGW) sends Sx Modify Request (PDN2) with updated DL FAR OCR and UL PDR OHR to the PFCP-EP. |
8 |
The PFCP-EP forwards the Sx Modify Request (PDN2) to User-Plane. |
9 |
The User-Plane sends the Sx Modify Response (PDN1) to the PFCP-EP. |
10 |
The PFPC-EP forwards the Sx Modify Response (PDN1) to the Service-Pod (SGW). |
11 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN1) with updated serving network information to the S5-GTP-EP. |
12 |
The S5-GTP-EP forwards the Modify Bearer Request (PDN1) to the PGW. |
13 |
The User-Plane sends the Sx Modify Response (PDN2) to the PFCP-EP. |
14 |
The PFCP-EP forwards the Sx Modify Response (PDN2) to the Service-Pod (SGW). |
15 |
The Service-Pod (SGW) sends the Modify Bearer Request (PDN2) with the updated serving network information to S5-GTP-EP. |
16 |
The S5-GTP-EP sends the Modify Bearer Request (PDN2) to the PGW. |
17 |
The PGW sends the Modify Bearer Response (PDN1) to the S5-GTP-EP. |
18 |
The S5-GPT-EP forwards the Modify Bearer Response (PDN1) to the Service-Pod (SGW). |
19 |
The Service-Pod (SGW) forwards the Modify Bearer Response (PDN1) to the S11-GTP-EP. |
20 |
The Service-Pod (SGW) updates the PDN1 session sent to the CDL Endpoint. |
21 |
The S11-GTP-EP sends the Modify Bearer Response (PDN1) to the New-MME. |
22 |
The PGW sends the Modify Bearer Response for (PDN2) to the S5-GTP-EP. |
23 |
The S5-GPT-EP forwards the Modify Bearer Response (PDN2) to the Service-Pod (SGW). |
24 |
The Service-Pod (SGW) forwards the Modify Bearer Response (PDN2) to the S11-GTP-EP. |
25 |
The Service-Pod (SGW) marks Inter-MME as completed (PDN2) and updates PDN2 session sent to the CDL Endpoint. |
26 |
The S11-GTP-EP sends the Modify Bearer Response (PDN2) to New-MME. |