PCF-initiated Bearer Modification for EPS session on SMF Call Flow

This section describes the PCF-Initiated Bearer Modification for EPS session on SMF call flow.

PCF-Initiated Bearer Modification for EPS session on SMF Call Flow
PCF-Initiated Bearer Modification for EPS session on SMF Call Flow Description
StepDescription
1PCF initiates the N7 Policy Update Notify with the updated parameters of QoS or TFT toward SMF.
2SMF sends the “200 OK” acknowledgment to PCF. The PCC rules that the PCF provides are mapped to TFTs for the modified dedicated bearer. The associated QoS is mapped to 4G QoS.
3SMF sends the Update Bearer Request to SGW.
4SGW sends the Update Bearer Response to SMF with EPS Bearer ID and the modified QoS or TFT for the associated bearer.
5SMF initiates the PFCP Modification request toward UPF.
6UPF sends the PFCP Modification Response to SMF with updated QER.
7SMF sends the PCF Notify message to PCF.
8PCF sends the “200 OK” acknowledgment to SMF.