Multiple CBR for Same PDN Call Flow
This section describes the Multiple CBR for Same PDN call flow.

Step |
Description |
---|---|
1 |
Initial Attach completed. One PDN has established PDN1 (ebi 5). The PGW sends the Create Bearer Request 1 for PDN1 to the S5-GTP-EP. |
2 |
The S5-GTP-EP forwards the Create Bearer Request 1 for PDN1 to the cnSGW. |
3 |
The cnSGW sends the Sx Modify Request 1 for PDN1 to the PFCP-EP. |
4 |
The cnSGW receives the Sx Modify Response 1 for PDN1 from the PFCP-EP. |
5 |
The cnSGW sends the Create Bearer Request 1 for PDN1 to the S11-GTP-EP. |
6 |
The S11-GTP-EP sends the Create Bearer Request 1 for PDN1 to the MME. |
7 |
The PGW sends the Create Bearer Request 2 to the S5-GTP-EP. |
8 |
The S5-GTP-EP sends the Create Bearer Request 2 to the cnSGW. |
9 |
The cnSGW sends the Sx Modify Request 1 (Create Bearer Request 2) for PDN1 to the PFCP-EP. |
10 |
The PGW sends the Create Bearer Request 3 for PDN1 to the S5-GTP-EP. |
11 |
The S5-GTP-EP sends the Create Bearer Request 3 for PDN1 to the cnSGW |
12 |
The PFCP-EP sends the Sx Modify Response 1 (CBR2) for PDN1 to the cnSGW. |
13 |
The cnSGW sends the Create Bearer Request 2 for PDN1 to the S11-GTP-EP. |
14 |
The S11-GTP-EP sends the Create Bearer Request 2 for PDN1 to the MME. |
15 |
The cnSGW sends the Sx Modify Request 1(CBR3) for PDN1 to the PFPC-EP. |
16 |
The MME sends the Create Bearer Response 1 (ebi6) for PDN1 to the S11-GTP-EP. |
17 |
The S11-GTP-EP sends the Create Bearer Response 1 (ebi6) for PDN1 to the cnSGW. |
18 |
The cnSGW receives the Sx Modify Response 1 (CBR3) for PDN1 to the PFPC-EP. |
19, 20 |
The cnSGW sends the Create Bearer Request 3 to the S11-GTP-EP. |
20 |
The S11-GTP-EP sends the Create Bearer Request 3 to the MME. |
21 |
The cnSGW sends the Sx Modify Request 2(CBR1) for PDN1 to the PFPC-EP. |
22 |
The cnSGW receives the Sx Modify Response 2 (CBR1) for PDN1 to the PFPC-EP. |
23 |
The cnSGW sends the Create Bearer Response 1 (ebi 6) for PDN1 to the S5-GTP-EP. |
24 |
The S5-GTP-EP sends the Create Bearer Response 1 (ebi 6) for PDN1 to the PGW. |
25 |
The MME sends the Create Bearer Response 2 (ebi 7) for PDN1 sent from MME to cnSGW. |
26 |
The S11-GTP-EP sends the Create Bearer Response 2 (ebi 7) for PDN1 sent from MME to the cnSGW. |
27 |
The cnSGW sends the Sx Modify Request 2 (CBR2) for PDN1 to PFCP-EP. |
28 |
The PFCP-EP sends the Sx Modify Response 2 (CBR2) for PDN1 to the cnSGW. |
29 |
The cnSGW sends the Create Bearer Response 2 (ebi 7) for PDN1 to the S5-GTP-EP. |
30 |
The S5-GTP-EP sends the Create Bearer Response 2 (ebi 7) for PDN1 to the PGW. |
31 |
The MME sends the Create Bearer Response 3 (ebi 8) for PDN1 to the S11-GTP-EP. |
32 |
The S11-GTP-EP sends the Create Bearer Response 3 (ebi 8) for PDN1 to the cnSGW. |
33 |
The cnSGW sends the Sx Modify Request 2 (CBR3) for PDN1 to the PFPC-EP. |
34 |
The PFCP-EP send the Sx Modify Response 2 (CBR3) for PDN1 to the cnSGW. |
35 |
The cnSGW sends the Create Bearer Response 3 (ebi 8) for PDN1 to the S5-GTP-EP. |
36 |
The S5-GTP-EP sends the Create Bearer Response 3 (ebi 8) for PDN1 to the PGW. |