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ATCF: Access Transfer Control Function
ATG: Air To Ground
ATGW: Access Transfer Gateway
ATIAS: Terminal Audio quality performance and Test methods for Immersive Audio Services
ATM: Asynchronous Transfer Mode
ATO: Automatic Train Operation
ATP: Automatic Train Protection
ATSC: Advanced Television Systems Committee
ATSSS: Access Traffic Steering, Switching and Splitting
ATSSS-LL: ATSSS Low-Layer
ATT: Attenuator
ATW: Asynchronous Time Warping
AUC: Authentication Centre
AUID: Application Unique IDentity
AUL: Autonomous Uplink
AUL-DFI: Autonomous UL Downlink Feedback Indication
AUL-UCI: AUL uplink control information
AUN3: Authenticable Non-3GPP devices
AUSF: Authentication Server Function
AUTN: Authentication token
AUTS: Re-synchronisation Token
AV: Authentication Vector
AV': transformed Authentication Vector
AVC: Advanced Video Coding
AVC-HD: Advanced Video Codec – High Definition
AVP: Attribute-Value Pair
AVPROD: AV Production
AW: Average Window
AWGN: Additive White Gaussian Noise
AnLF: Analytics Logical Function
AoA: Angle of Arrival
AoC: Advice of Charge
AoD: Angle-of-Departure
AoI: Area of Interest
App: Application
Att: Attempt(s,ed)
AuC: Authentication Centre
Auto-NS-LCM: Automatic Application Layer Network Slice Lifecycle Management
B-TID: Bootstrapping Transaction Identifier
B2B: Business to Business
B2B2X: Business to Business to Everything
B2BUA: Back-to-Back User Agent
B2C: Business to Consumer
BA: Bandwidth Adaptation
BAP: Backhaul Adaptation Protocol
BAR: Buffering Action Rule
BAT: Burst Arrival Time
BB: Base Band
BBERF: Bearer Binding and Event Reporting Function
BBF: Broadband Forum
BBIFF: Bearer Binding Intercept and Forward Function
BC: Band Category
BC1: Block Compression for RGB
BCCH: Broadcast Control Channel
BCD: Binary Coded Decimal
BCE: Billing and Charging Evolution
BCH: Broadcast Channel
BCM: Bearer Control Mode
BCP: Basic Communication Part
BCS: Bandwidth Combination Set
BCSM: Basic Call State Model
BD: Billing Domain
BD AIT: Baseline DNS Action Information Template
BD MDT: Baseline DNS Message Detection Template
BDN: Barred Dialling Number
BDS: BeiDou Navigation Satellite System
BDT: Background Data Transfer
BER: Bit Error Ratio
BER-TLV: Basic Encoding Rule - TLV
BFCP: Binary Floor Control Protocol
BFD: Beam Failure Detection
BFD-RS: BFD Reference Signal
BFR: Beam Failure Recovery
BG: Border Gateway
BGCF: Breakout Gateway Control Function
BH: Backhaul
BHHL: Beside Head and Hand Left Side (Head and Hand Phantom)
BHHR: Beside Head and Hand Right Side (Head and Hand Phantom)
BICC: Bearer Independent Call Control
BIPM: Bureau International des Poids et Mesures (International Bureau of Weights and Measures)
BL: Bandwidth reduced Low complexity
BL/CE: Bandwidth-reduced Low-complexity or Coverage Enhanced
BLE: Bluetooth Low Energy
BLER: Block Error Rate
BM: Beam Management
BM-RS: Beam Management Reference Signal
BM-SC: Broadcast Multicast Service Centre
BMCA: Best Master Clock Algorithm
BMFF: (ISO) Base Media File Format
BMG: Broadcast Message Gateway
BNF: Backus–Naur Form
BP: Branching Point
BPF: Band Pass Filter
BPRE: Bits Per Resource Element
BPS: Body Proximity Sensing
BPSK: Binary Phase-Shift Keying
BR: Bandwidth Reduced
BR-BCCH: Bandwidth Reduced Broadcast Control Channel
BRAS: Broadband Remote Access Server
BRID: Broadcast Remote Identification