3GPP 23.501 v20.2.0 — the document's own text
5.8.5.15 Downlink Data Report generated by UPF
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 UPF sends the Downlink Data Report to inform the SMF about the events related to receiving or discarding of downlink packets. The SMF controls this type of UPF report by providing instructions in the Buffer Action Rule of a FAR.
Following attributes can be included:
Table 5.8.5.15-1: Attributes within Downlink Data Report
| Attribute | Description | Comment |
|---|---|---|
| N4 Session ID | Uniquely identifies a session. | Identifies the N4 Session associated to this Usage Report |
| Rule ID | Uniquely identifies the Packet Detection Rule which triggered the report. | |
| Downlink Data Service Information | Indicates that the first downlink packet has been received for a QoS Flow at the UPF by reporting the QFI, if it is available. For the IP PDU Session Type, the DSCP in TOS (IPv4) / TC (IPv6) value from the IP header of the downlink packet will also be reported. | This is used for downlink data notification related to QoS Flows. |
| Downlink Data Status | Indicates that the first downlink packet has been buffered or discarded for a service data flow at the UPF. | This is used for downlink data delivery status notification related to individual services. |