Rate Limiting for Dynamic Rules
As per 3GPP TS 29.244, the following IE is received from SMF for QoS enforcement in Create QER or Update QER in Session Establishment or Modification Request:
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Maximum Bitrate: This IE is present if an MBR enforcement action is applied to packets matching this PDR. When present, this IE indicates the uplink and/or downlink maximum bit rate to be enforced for packets matching the PDR. For 5GC, this IE may be set to the value of:
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the Session-AMBR - for a QER that is referenced by all the PDRs of the non-GBR QoS flows of a PDU session.
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the QoS Flow MBR - for a QER that is referenced by all the PDRs of a QoS Flow.
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the SDF MBR - for a QER that is referenced by all the PDRs of an SDF.
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Guaranteed Bitrate: This IE is present if a GBR has been authorized to packets matching this PDR. When present, this IE indicates the authorized uplink and/or downlink guaranteed bit rate. This IE may be set to the value of:
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the aggregate GBR - for a QER that is referenced by all the PDRs of a GBR bearer
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the QoS Flow GBR - for a QER that is referenced by all the PDRs of a QoS Flow
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the SDF GBR - for a QER that is referenced by all the PDRs of an SDF
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QoS flow identifier (QFI): This IE is present if the QoS flow identifier is inserted by the UPF.
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Gate Status: This IE indicates whether the packets are allowed to be forwarded (the gate is open) or it is discarded (the gate is closed) in the uplink and/or downlink directions.
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QER Correlation ID: This IE is present if the UP function is required to correlate the QERs of several PFCP sessions, for APN-AMBR enforcement of multiple UE's PDN connections to the same APN.
Note | Although it is not applicable, but if UPF receives QoS Enforcement Rule Correlation ID for 5G PFCP sessions then it will enforce it. |
The SMF provisions QoS enforcement in UPF by creating necessary PDRs to represent SDF, QoS Flow and session and associating respective QERs as follows:
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creating QERs for the QoS enforcement at session level, SDF level.
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creating QERs for the QoS enforcement of the aggregate of SDFs with the same GBR QFI.
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associating the session level QER to all the PDRs defined for the session.
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associating the SDF or application QER to the PDRs associated to the SDF or application.
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associating the QER of the aggregate of SDFs to the PDRs associated to SDFs or applications that share the QER.