Limitations
The Authorized QoS Handling for Default Bearer feature has the following limitations:
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The SMF supports only the standard QCI/5QI change in authorized default QoS IE of the Session Rules. It does not support any change to the Guaranteed Bit Rate (GBR) QCI/5QI of authorized QoS. The SMF rejects any request for modification of QCI/5QI of a QoS data associated with Policy and Charging Control (PCC) rule.
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The SMF does not support QCI/5QI change for dynamic rules.
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The SMF supports QCI/5QI change only for predefined and static rules that are associated to the default bearer. If a predefined rule is associated with a non-default flow or bearer, the SMF does not support QCI/5QI change for that rule.
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The combination of QoS flow binding parameters, such as 5QI, ARP, and so on, for the authorized QoS never remains the same as that of a dedicated bearer or flow. That is, change in QCI/5QI should not result in the default flow having the binding parameters similar to another flow.
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The SMF does not support changes to any other binding parameter including Allocation and Retention Priority (ARP) except the QCI/5QI (with or without session AMBR) in the Session Rules.
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When the QCI/5QI changes, the existing default bearer flow is modified towards N1, N2, and N4 interfaces. In this case, the SMF does not delete the existing flow instead creates a new flow.