Create Bearer Procedure Call Flow
This section describes the create bearer procedure call flow.

Step |
Description |
---|---|
1 |
PGW receives IP-CAN session modification request from PCRF. PGW creates the Create Bearer Request message and sends it to SGW (cnSGW-C). |
2 |
SGW (cnSGW-C) forwards the Create Bearer Request message request to MME. |
3 |
MME generates a Create Bearer Response message towards SGW (cnSGW-C). If bearer setup fails, then the RAN/Cause list included in the response. |
4 |
SGW (cnSGW-C) forwards the Create Bearer Response message to PGW. It includes RAN/NAS Cause Code list. |