Classifies a UE's uplink packets to QoS flows: the uplink counterpart of TrafficFlowFilter's QFI assignment, sitting where uplink traffic enters the UE's stack just as the TFF sits where downlink traffic enters the tunnel at the core network. Each direction is classified once, at its ingress.

The classification rules are delivered by the BearerConfigurator (see its ulQfiRules parameter, where they can be scoped per UE), through the UE's RRC: the same rule grammar the downlink rules use, evaluated in order, first match wins. They model the QoS rules that NAS signaling installs into a UE at PDU session establishment (TS 23.501 5.7.1.4); this module never authors rules of its own.

A matched packet is stamped with a QfiReq tag, which NrSdap consumes for its QFI-to-DRB mapping. A packet no rule covers is left untagged -- deliberately not tagged with 0, because QFI 0 is a real classification (the default flow) and absence is what lets SDAP fall back to reflective QoS or the default DRB. A packet that already carries a QfiReq (an application that set the QFI directly) is not second-guessed. With no rules delivered, SDAP behaves as if this module were not there.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Parameters

Name	Type	Default value	Description
sessionType	string		The type of the UE's session (see LteUe): an Unstructured session has one QoS flow, the default one, which every packet is classified to without evaluating the rules; an Ethernet session's frames are classified by the rules (a dscpAsQfi rule does not match a frame)

Properties

Name	Value	Description
display	i=block/classifier

Gates

Name	Direction	Size	Description
upperLayerIn	input
lowerLayerOut	output

Source code

//
// Classifies a UE's uplink packets to QoS flows: the uplink counterpart of
// ~TrafficFlowFilter's QFI assignment, sitting where uplink traffic enters the
// UE's stack just as the TFF sits where downlink traffic enters the tunnel at
// the core network. Each direction is classified once, at its ingress.
//
// The classification rules are delivered by the ~BearerConfigurator (see its
// ulQfiRules parameter, where they can be scoped per UE), through the UE's RRC:
// the same rule grammar the downlink rules use, evaluated in order, first match
// wins. They model the QoS rules that NAS signaling installs into a UE at PDU
// session establishment (TS 23.501 5.7.1.4); this module never authors rules of
// its own.
//
// A matched packet is stamped with a QfiReq tag, which ~NrSdap consumes for its
// QFI-to-DRB mapping. A packet no rule covers is left untagged -- deliberately
// not tagged with 0, because QFI 0 is a real classification (the default flow)
// and absence is what lets SDAP fall back to reflective QoS or the default DRB.
// A packet that already carries a QfiReq (an application that set the QFI
// directly) is not second-guessed. With no rules delivered, SDAP behaves as if
// this module were not there.
//
simple QosFlowClassifier like IQosFlowClassifier
{
    parameters:
        string sessionType;  // The type of the UE's session (see ~LteUe): an Unstructured session has one QoS flow, the default one, which every packet is classified to without evaluating the rules; an Ethernet session's frames are classified by the rules (a dscpAsQfi rule does not match a frame)
        @display("i=block/classifier");
    gates:
        input upperLayerIn;
        output lowerLayerOut;
}

File: src/simu5g/stack/sdap/QosFlowClassifier.ned

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