Create Session Request with Dedicated Bearer EBI Call Flow
This section describes the Create Session Request with the Dedicated EBI call flow.

Step |
Description |
---|---|
1 |
The MME sends a Create Session Request with the TIED value as zero to the GTPC-EP(S11). |
2 |
The GTPC-EP(S11) forwards the Create Session Request with TIED value as zero to the SGW-SVC. |
3 |
The MME and the PGW process the Initial Attach PDN with the EBI-5 process. |
4 |
The MME sends the Create Session Request with EBI-6 to the GTPC-EP. |
5 |
The GTPC-EP forwards the Create Session Request with EBI-6 to the SGW-SVC. |
6 |
The MME and PGW establish the PDN with the EBI-6 connection. |
7 |
The MME and PGW complete the Create Dedicated Bearer with EBI-7 process. |
8 |
If the SGW and MME are not in sync, then MME sends a Create Session Request with EBI-6 present in SGW. |
9 |
The GTPC-EP sends a CSReq with EBI-7 to SGW. |
10 |
After receiving the Create Session Request, the SGW-SVC:
The SGW sends a Sx Session Delete Request on PDN-2 to Protocol-SXA. |
11 |
The Protocol-SXA forwards the Sx Session Delete Request to SGW-UPF. |
12 |
The SGW sends a Session Establishment Request to the Protocol-SXA. |
13 |
The Protocol-SXA forwards a Sx Session Establishment Request to SGW-UPF. |
14 |
The SGW-UPF responds to the Protocol-SXA with the Sx Session Establishment Response. |
15 |
The Protocol-SXA sends the Sx Session Establishment Response to the SGW-SVC. |
16 |
The SGW-SVC sends the Create Session Request containing TIED=0x80002002, EBI-7 to the GTPC-EP. |
17 |
The GTPC-EP sends the Create Session Request containing TIED=0x80002002, EBI-7 to the PGW. |
18 |
The PGW sends a Create Session Response to the GTPC-EP. |
19 |
The GTPC-EP responds to the SGW-SVC with the Create Session Response. |
20 |
The SGW-SVC forwards the response to the GTPC-EP. |
21 |
The GTPC-EP sends the Create Session Response to the MME. |