5G • Core Network
GFBR
Guaranteed Flow Bit Rate
Minimum data rate in bits per second guaranteed to be delivered by the 5G network for a GBR QoS flow.
Technical Explanation
Signaled in the QoS Profile from SMF to gNodeB, GFBR specifies the minimum data rate the network guarantees to serve over a configured averaging window. If cell resources cannot sustain the requested GFBR, the gNodeB's admission control rejects the bearer creation.
Key Functions
- Specifies minimum guaranteed data rate for GBR and Delay-Critical flows
- Enforced by gNodeB radio admission control and packet scheduling
- Ensures consistent audio/video stream fidelity during peak network load
Specifications
3GPP TS 23.501
Interfaces
UuN2N3
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