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# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

QFI QoS Flow Identifier

An identifier used in the 5G system to mark packets and map them to a specific QoS (Quality of Service) Flow within a PDU (Protocol Data Unit) Session. The QFI is found in the 5G SDAP (Service Data Adaptation Protocol) layer, as well as in a GTPv1-U extension header.
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