Update Bearer Procedure Call Flow

This section describes the update bearer procedure call flow.

Update Bearer Procedure Call Flow
Update Bearer Procedure Call Flow Description

Step

Description

1

PGW receives IP-CAN session modification request from PCRF.

PGW creates the Update Bearer Request message to SGW (cnSGW-C).

2

SGW (cnSGW-C) forwards the Update Bearer Request message to MME.

3

MME generates an Update Bearer Response message towards SGW (cnSGW-C).

If this bearer modification fails, then the RAN/NAS list included in the response.

4

SGW (cnSGW-C) forwards the Update Bearer Response message to PGW.