Feature Description

The purpose of PDU session modification procedure is to create dedicated QoS flows for a UE. There are two ways to create dedicated QoS flows with different QoS characteristics to the default QoS flow for the UE such as the:

  • UE-initiated PDU session modification

  • Network-initiated PDU session modification

The network can be AN, AMF, or PCF.

The SMF receives a UE-initiated session modification request or network-initiated session modification request to augment the PDU session of UE to either modify an existing or creating a new QoS flow suitable for the user traffic.

Note

If there is a failure during a PCF-initiated flow deletion procedure, the SMF deletes the PCC rules and communicates the details on the deleted PCC rules to UPF and PCF.