5G • Core Network
MFBR
Maximum Flow Bit Rate
Maximum data rate in bits per second permitted for a GBR QoS flow; traffic exceeding MFBR is policed.
Technical Explanation
Signaled alongside GFBR, the Maximum Flow Bit Rate (MFBR) caps the maximum throughput a GBR stream can consume. Packets arriving at the UPF or gNodeB exceeding MFBR are dropped or shaped using token bucket policers, preventing a single video call from monopolizing radio resources.
Key Functions
- Caps maximum throughput allocated to a single GBR stream
- Policed via token bucket algorithms at UPF and gNodeB buffers
- Protects shared radio spectrum from runaway application bandwidth surges
Specifications
3GPP TS 23.501
Interfaces
UuN2N3
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