name: MDBV
full_form: Maximum Delay Budget Variation
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 Maximum Delay Budget Variation (MDBV) is a parameter used in the context of QoS Flows, specifically for Delay-critical GBR resource types. It represents the maximum allowed variation in delay budget for a particular QoS Flow. The MDBV is utilized by the Session Management Function (SMF) to ensure that the Guaranteed Flow Bit Rate (GFBR) of the QoS Flow can be achieved using the QoS Flow binding functionality.
explanation: MDBV is classified as a Parameter because it serves as a specific configuration setting used in managing QoS Flows, particularly for Delay-critical GBR resource types. Its value affects how the network handles delay-sensitive traffic and ensures that the GFBR can be met within the allowed variation.
section_title: 5.7.2.5 Flow Bit Rates
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