3GPP 23.501 v20.2.0 — the document's own text
5.8.2.4.2 Traffic Detection Information
Taught in 13. Where the packets actually go (The 5G system architecture, in depth), 5. The connection, and what is promised on it (The 5G system architecture, overview).
The SMF controls the traffic detection at the UP function by providing detection information for every PDR.
For IPv4 or IPv6 or IPv4v6 PDU Session type, detection information is a combination of:
- CN tunnel info.
- Network instance.
- QFI.
- IP Packet Filter Set as defined in clause 5.7.6.2.
- Application Identifier: The Application Identifier is an index to a set of application detection rules configured in UPF.
- FQDN Filter for DNS Query message.
For Ethernet PDU Session type, detection information is a combination of:
- CN tunnel info.
- Network instance.
- QFI.
- Ethernet Packet Filter Set as defined in clause 5.7.6.3.
In this Release of the specification for Unstructured PDU Session Type, the UPF does not perform-QoS Flow level traffic detection for QoS enforcement.
Traffic detection information sent by the SMF to the UPF for a PDU Session may be associated with Network instance for detection and routing of traffic over N6. In the case of IP PDU Session Type, Network Instances can, e.g. be used by the UPF for traffic detection and routing in the case of different IP domains or overlapping IP addresses. In the case of Ethernet PDU Session Type, different Network Instances can e.g. be configured in the UPF with different ways to handle the association between N6 and the PDU Sessions.
When the DL traffic is end-to-end encrypted, the UPF may identify the media related information using On-Path N6 signalling as described in clause 5.37.9