name: GFBR
full_form: Guaranteed Flow Bit Rate
context: For GBR QoS Flows only, the following additional QoS parameters exist: - Guaranteed Flow Bit Rate (GFBR) - UL and DL; - Maximum Flow Bit Rate (MFBR) -- UL and DL. The GFBR denotes the bit rate that is guaranteed to be provided by the network to the QoS Flow over the Averaging Time Window. The MFBR limits the bit rate to the highest bit rate that is expected by the QoS Flow (e.g. excess traffic may get discarded or delayed by a rate shaping or policing function at the UE, RAN, UPF). Bit rates above the GFBR value and up to the MFBR value, may be provided with relative priority determined by the Priority Level of the QoS Flows (see clause 5.7.3.3). GFBR and MFBR are signalled to the (R)AN in the QoS Profile and signalled to the UE as QoS Flow level QoS parameter (as specified in TS 24.501[ Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 ]  [47]) for each individual QoS Flow. NOTE 1: The GFBR is recommended as the lowest acceptable service bitrate where the service will survive. NOTE 2: For each QoS Flow of Delay-critical GBR resource type, the SMF can ensure that the GFBR of the QoS Flow can be achieved with the MDBV of the QoS Flow using the QoS Flow binding functionality described in clause 6.1.3.2.4 of TS 23.503[ Policy and charging control framework for the 5G System (5GS); Stage 2 ]  [45]. NOTE 3: The network can set MFBR larger than GFBR for a particular QoS Flow based on operator policy and the knowledge of the end point capability, i.e. support of rate adaptation at application / service level.
description: The Guaranteed Flow Bit Rate (GFBR) is a Quality of Service (QoS) parameter that denotes the minimum bit rate guaranteed by the network to be provided to a QoS Flow over a specified Averaging Time Window. It serves as a critical metric in ensuring that a specific level of service quality is maintained for delay-critical communications, such as real-time applications. GFBR is signaled to both the Radio Access Network (RAN) and the User Equipment (UE), playing a pivotal role in managing QoS Flow bit rates and ensuring that services operate within acceptable performance thresholds.
explanation: GFBR is classified as a Parameter because it represents a specific configuration setting used in the management of Quality of Service (QoS) for telecommunications. It directly influences how network resources are allocated to ensure guaranteed service quality, aligning with the detailed specifications outlined in 3GPP TS 23.501 and related documents.
section_title: 5.7.2.5 Flow Bit Rates
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