5G Acronyms

As a 5G Radio Access Network engineer I prepared a list of 5G acronyms that can be useful for the people who are reading 3GPP specifications, books about 5G or  papers. The reason behind this list is, when I was searching an abbreviation in search engines, it was hard to find the real acronym that is used in the paper or the book that I am reading. For example; if you are searching for the CFO, it will be very hard to find “Carrier Frequency Offset”. In this list, you will find the acronym that are focused on telecommunication and 5G, however it includes some general acronyms also. 

NOTE: If you find any mistake do not hesitate to report.


Acronym Meaning
3G 3rd Generation (cellular communications)
3GPP 3rd Generation Partnership Project (www.3gpp.org)
4G 4th Generation (cellular communications)
5G 5th Generation (cellular communications)
5G-AN 5G Access Network
5G-EIR 5G-equipment Identity Register
5G-GUTI 5G Globally Unique Temporary Identifier
5G-S-TMSI 5G-S-Temporary Mobile Subscription Identifier
5GAA 5G Automotive Association
5GC 5G Core
5GCN 5G Core Network (24.301)
5GPoAs 5G Points of Attachment
5GS 5G System
5GTTI 5G Trial & Testing Initiative
5QI 5G QoS Identifier (or Indicator)
A-CSI Aperiodic CSI
A-MPR Additional Maximum Power Reduction
A‐CPI Application‐Controller Plane Interface
AA Antenna Array
AAA Authorization, Authentication, And Accounting
AAS Active Antenna System
AAS BS Active Antenna System Base Station
ABG Alpha Beta Gamma
ABNO Applications‐Based Network Operations
ABS Almost Blank Subframes
AC Access Class
ACB Access Class Barring
ACDM Algebraic Channel Decomposition Multiplexing
ACIR Adjacent Channel Interference Ratio
ACK Acknowledgment (in ARQ protocols)
ACLR Adjacent Channel Leakage Ratio
ACS Adjacent Channel Selectivity
ADB Aggregated Data Bundle
ADC Analog-to-Digital Converter
AE Action Enforcer
AES Advanced Encryption Standard
AF Application Function
AF‐x Adaptation Function–number x
AGC Automatic Gain Control
AI Air Interface
AIV Air Interface Variant
AKA Authentication and Key Agreement
AL Aggregation level
AM Acknowledged Mode (in RLC)
AM Amplitude Modulation
AMBR Aggregate Maximum Bir Rate
AMC Adaptive Modulation and Coding
AMF Access and Mobility Management Function
AMPS Advanced Mobile Phone System
AN Access Network
AN‐I Access Network‐Inner (layer)
AN‐O Access Network‐Outer (layer)
ANDSF Access Network Discovery and Selection Function
ANQP Access Network Query Protocol
ANR Automatic Neighbor Relation
AoA Angle of Arrival
AoD Angle of Departure
AP Access Point
AP Antenna port
AP Application Protocol
AP ID Application Protocol Identity
API Application Programming Interface
APN Access Point Name
APT Average Power Tracking
ARFCN Absolute Radio Frequency Channel Number
ARI Acknowledgment Resource Indicator
ARIB Association of Radio Industries and Businesses
ARP Address Resolution Protocol
ARP Allocation and Retention Priority
ARPU Average Revenue Per User
ARQ Automatic Repeat Query
ARQ Automatic Repeat request
AS Access Stratum
AS Angular Spread
AS‐PCE Active Stateful Path Computation Element
ASIC Application Specific Integrated Circuit
ASN.1 Abstract Syntax Notation One
ATB Adaptive Transmission Bandwidth
ATIS Alliance for Telecommunications Industry Solutions
AUSF Authentication Server Function
AVX Advanced Vector Extensions (Intel CPU Intructions for high performance computing.)
AVX2 Advanced Vector Extensions 2 (new level of performance for floating point operations added to AVX)
AWGN Additive White Gaussian Noise
B‐TAG Backbone VLAN Tag
BA Bandwidth Adaptation
BB BaseBand
BBU BaseBand Unit
BC Band Category
BC Broadcast Channel (MU-MIMO BC -> MU-MIMO Broadcast Channel)
BCCH Broadcast Control Channel
BCH Broadcast Channel
BCJR Bahl, Cocke, Jelinek and Raviv algorithm
BD Blind Detection
BER Bit Error Rate
BF BeamForming
BF‐OFDM Block‐Filtered OFDM
BH BackHaul
BI Backoff Indicator (38.321)
BiCMOS Bipolar Complementary Metal Oxide Semiconductor
BLER Block Error Rate
BMS Broadcast/Multi-cast Services
BPL Beam Pair Link
BPSK Binary Phase Shift Keying
BRP Beam Resource Pool
BRRS Beam Refinement Reference Signal
BRS Beam Reference Signal
BS Base Station
BSD Buffer Size Duration
BSF Binding Support Function
BSI Beam state information
BSM Basic Safety Message
BSR Buffer State Reporting (Buffer Status Report)
BSS Business Support System
BV Bandwidth-Variable
BVT Bandwidth-Variable Transponders
BW Bandwidth
BWC Bandwidth Combination
BWCS Bandwidth Combination Set
BWP Bandwidth Part
C-MTC Critical Machine-Type Communications
C‐ITS Cooperative‐ITS
C‐RAN or CRAN Centralized/Cloud Radio Access Network
C‐RNTI Cell Radio Network Temporary Identifier
C/I Carrier‐to‐Interference (ratio)
CA Carrier Aggregation
CACLR Cumulative ACLR
CACLR Cumulative Adjacent Channel Leakage Ratio
CAGR Compound Annual Growth Rate
CAM Cooperative Awareness Messages
CAPEX Capital Expenditures
CAZAC Constant Amplitude Zero Autocorrelation (Zadof Chu is a CAZAC Sequence)
CB Code Block
CBC Cell Broadcast Center
CBE Cell Broadcast Entity
CBG Codeblock Group
CBGFI CBG Flush Indicator
CBGTI CBG Transmit Indicator (or CBG Transmission Information)
CBRA Contention Based Random Access
CBS Cell Broadcast Service
CBW Channel band width
CC Component Carrier
CC Convolutional Code
CCA Clear Channel Assessment
CCCH Common Control Channel
CCDF Complementary Cumulative Distribution Function
CCE Control Channel Element
CCH Control Channel
CCNF Common Control Network Function
CCO Cell Change Order
CCSA China Communications Standards Association
CD Code Division
CD-SSB Cell Defining SSB
CDD Cyclic Delay Diversity
CDF Cumulative Distribution Function
CDM Code Division Multiplexing
CDMA Code Division Multiple Access
CDN Content Delivery Network
CE Control Element
CEPT European Conference of Postal and Telecommunications Administration
CFO Carrier Frequency Offset
CFRA Contention Free Random Access
CGI Cell Global Identifier
CH Cluster Head
CI Close‐In
CID Context Identifier
CIF Carrier Indicator Field
CIoT Cellular Internet of Things
CITEL Inter-American Telecommunication Commission
CK Cipher Key
CLI Cross‐Link Interference
CM Connection Management
CM Cubic Metric
CMAS Commercial Mobile Alert Service
CMC Connection Mobility Control
CMO Control, Management and Orchestration
CMOS Complementary Metal‐Oxide Semiconductor
CN Core Network
CNE Core Network Element
CNI Core Network Instance
CoMP Coordinated/Cooperative Multi‐Point
CORESET Control Resource Set
COST European Cooperation in Science and Technology
COT Channel Occupancy Time
COTS Commercial Off‐The‐Shelf
CP Compression Point
CP Control Plane
CP Cyclic Prefix
CP-OFDM Cyclic Prefix – OFDM
CPE Common Phase Error
CPE Customer Premise Equipment
CPRI Common Public Radio Interface
CQI Channel Quality Indicator
CRB Common Resource Block
CRC Cyclic Redundancy Check
CRE Cell Range Extension
CRI CSI-RS Resource Indicator
CRS Cell-specific Reference Signal (Symbol)
CS Capability Set (for MSR base stations)
CS Configured Scheduling
CS-RNTI Configured Scheduling RNTI (38.321)
CSA Common Subframe Allocation
CSC Cell and Subframe Control
CSG Closed Subscriber Group
CSI Channel State Information
CSI-IM CSI – Interference Measurement
CSI-RS CSI – Reference Signal
CSI-RSRP CSI Reference Signal Received Power
CSI-RSRQ CSI Reference Signal Received Quality
CSI-SINR CSI Signal-to-Noise and Interference Ratio
CSIPTO Coordinated SIPTO
CSIT Channel State Information (transmitter side)
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance
CSP Communication Service Provider
CSS Common Search Space
CTC Convolutional Turbo Codes
CTS Clear-To-Send
CU Central Unit
CW Codeword
CW Continuous Wave
CWS Contention Window Size
D-RoF Digital-Radio Over Fiber
D‐CPI Data‐Controller Plane Interface
D‐RAN Distributed Radio Access Network
D2D Device-to-Device
D2N Device‐to‐Network
DAC Digital‐to‐Analog Converter
DAI Downlink Assignment Index
DAS Distributed Antenna System
DBSCAN Density‐Based Spatial Clustering of Applications with Noise
DC Direct Current (DC subcarrier)
DC Dual Connectivity
DCC Decentralized Congestion Control
DCCH Dedicated Control Channel
DCH Dedicated Channel
DCI Downlink Control Information (PDCCH)
DCN Dedicated Core Network
DD‐OFDM Direct Detection OFDM
DDoS Distributed Denial of Service
DECOR Dedicated Core
DEI Drop Eligible Indicator
DEN Decentralized Environmental Notification
DeNB Donor eNB
DFS Dynamic Frequency Selection
DFT Discrete Fourier Transform
DFT-s-OFDM Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing
DL Downlink
DL-SCH Downlink Shared Channel
DM Decision‐Maker
DM-RS Demodulation Reference Signal
DMC Dense Multipath Component
DMRS Demodulation Reference Signal
DN Data Network
DNN Data Network Name
DoA Direction of Arrival
DPC Dirty Paper Coding [The idea with DPC is to pre-cancel interference at the transmitter by using perfect knowledge about the channel and transmitted signals. (It is a nonlinear precoding technique).]
DPD Digital Pre‐Distortion
DPDK Data Plane Development Kit
DR D2D Receiver
DR Dynamic Range
DRB Data Radio Bearer (carrying user plane data)
DRS Dedicated Reference Signals
DRX Discontinuous Reception
DSAC Domain Specific Access Control
DSC Decentralized Congestion Control Sensitivity Control
DSCP Differentiated Services Code Point
DSP Digital Signal Processor
DSRC Dedicated Short Range Communications
DSS Dynamic Spectrum Sharing
DT Decision Tree
DTCH Dedicated Traffic Channel
DTT Digital Terrestrial Television
DTX Discontinuous Transmission
DU Distributed Unit
DVB Digital Video Broadcasting
DWDM Dense Wavelength Division Multiplexing
DwPTS Downlink Pilot Time Slot
E-CID Enhanced Cell-ID (positioning method)
E-RAB E-UTRAN Radio Access Bearer
E-RAB EPS Radio Access Bearer
E-SMLC Evolved Serving Mobile Location Centre
E-UTRA Evolved Universal Terrestrial Radio Access
E-UTRAN Evolved Universal Terrestrial Radio Access Network
E2E End‐to‐End
EAB Extended Access Barring
EATA European Automotive‐Telecom Alliance
ECC Electronic Communications Committee (of CEPT) 
ECDSA Elliptic Curve Digital Signature Algorithm
ECGI E-UTRAN Cell Global Identifier
ECM EPS Connection Management
ECN Explicit Congestion Notification
ED Energy Detection
EDCA Enhanced Distributed Channel Access
eDECOR evolved DECOR
EDGE Enhanced Data Rates for GSM Evolution (Enhanced Data Rates for Global Evolution)
EHPLMN Equivalent Home Public Land Mobile Network
eICIC Enhanced Inter‐Cell Interference Coordination
eIMTA Enhanced Interference Mitigation and Traffic Adaptation
EIR Equipment Identity Register
EIRP Effective Isotropic Radiated Power
EIS Equivalent Isotropic Sensitivity
eLAA Enhanced License Assisted Access
eLTE enhanced Long‐Term Evolution
EM Element Management
eMBB Enhanced Mobile Broadband
eMBMS enhanced Mobile Broadband Multimedia Services
EMF Electromagnetic Field
EMM Eps Mobility Management
EN-DC E-UTRA – NR Dual Connectivity (37.340)
eNB enhanced Node‐B
eNB eNodeB
eNodeB E-UTRAN Node B/evolved Node B
EPC Evolved Packet Core
ePDCCH enhanced PDCCH
ePDG Evolved Packet Data Gateway
ePHR extended Power Headroom Report
EPRE Energy Per Resource Element
EPS Evolved Packet System (LTE)
eRE eCPRI Radio Equipment
eREC eCPRI Radio Equipment Control
ERP Effective Radiated Power
ET Envelope Tracking
ETH Ethernet
ETN Edge Transport Nodes
ETSI European Telecommunications Standards Institute
ETWS Earthquake and Tsunami Warning System
EVM Error Vector Magnitude
F1 Interface between CU and DU in 5G RAN
F1-C F1 Control plane interface
F1-U F1 User plane interface
F1AP F1 Application Protocol
FAPI Functional Application Platform Interface
FBE Frame Based Equipment
FBMC Filter Bank Multi-Carrier
FBR Front‐to‐Back Ratio
FBW Fractional Bandwidth
FC‐OFDM Flexibly Configured – OFDM
FCAPS Fault Configuration, Accounting, Performance, Security
FCC Federal Communications Commission
FD Full Duplex
FD-MIMO Full Dimension – MIMO
FDD Frequency Division Duplexing
FDM Frequency Division Multiplexing
FDMA Frequency Division Multiple Access
FDRA Frequency Domain Resource Assignment
FDV Frame‐Delay Variation
FEC Forward Error Correction
FeICIC Further enhanced Inter‐Cell Interference Coordination
FeLAA Further Enhanced LAA
FET Field-Effect Transistor
ffs For Further Study
FFT Fast Fourier Transform
FH Fronthaul
FI Float Intercept
FIR Finite Impulse Response
FL Front-Loaded (DMRS)
FMC First Missing Count
FN False Negatives
FoM Figure-of-Merit
FP False Positives
FPGA Field Programmable Gate Array
FPLMTS Future Public Land Mobile Telecommunications Systems
FQAM Frequency Quadrature Amplitude Modulation
FQDN Fully Qualified Domain Name
FR Frequency Range
FR DMRS Front Loaded DMRS
FR1 Frequency Range 1 (410 MHz – 7125 MHz)
FR2 Frequency Range 2 (24.25 GHz – 52.6 GHz)
FRC Fixed Reference Channel
Fs‐C Intra‐RAN Control Plane Interface
Fs‐U Intra‐RAN User Plane Interface
FSPL Free‐Space Path Loss
FSTD Frequency Shift Time Diversity
FTP File Transfer Protocol
FTTA Fiber‐to‐the‐Antenna
FWA Fixed Wireless Access
GAA General Authorized Access
GaAs Gallium Arsenide
GaN Gallium Nitride
GAN Generic Access Network
GBR Guarenteed Bit Rate
GDB/GLDB GeoLocation DataBase
GEPON Gigabit Ethernet PON
GERAN GSM/EDGE Radio Access Network
GF Grant Free
GFBR Guaranteed Flow Bit Rate
GFDM Generalized Frequency Division Multiplexing
GLOSA Green Light Optimal Speed Advice
GMLC Gateway Mobile Location Centre
GMPLS Generalized Multi‐Protocol Label Switching
gNB gNodeB
gNB-CU gNB Central Unit (RRC, SDAP and PDCP)
gNB-DU gNB Distributed Unit (RLC, MAC and PHY layers)
gNodeB next Generation Node B
GNSS Global Navigation Satellite System
GOPS Giga Operations
GP Guard Period
GPON Gigabit Passive Optical Network
GPP General Purpose Processing
GPRS General Packet Radio Service
GPS Global Positioning System
GPSI Generic Public Subscription Identifier
GRE Generic Routing Encapculation
GSA Global mobile Suppliers Association
GSCM Geometry‐based Stochastic Channel Model
GSCN Global Synchronization Channel Number
GSM Global System for Mobile Communications
GSMA GSM Association
GT Guard Time
GTP GPRS Tunneling Protocol (29.060)
GTP-U GPRS Tunneling Protocol – User Plane
GUAMI Globally Unique AMF Identifier (38.413)
GUI Graphical User Interface
GUMMEI Globally Unique MME Identifier
GUTI Globally Unique Temporary Identity (23.003)
GW Gateway
HARQ Hybrid Automatic Repeat Request (or Querry)
HARQ-ACK Hybrid Automatic Repeat Request – Acknowledgement 
HBT Heterojunction Bipolar Transistor
HEMT High Electron-Mobility Transistor
HeNB Home eNB
HetNet Heterogeneous Network
HFN Hyper Frame Number
HFN Hyper system Frame Number  (Hyper SFN)
HLR Home Location Register
HO Handover
HPA High Power Amplifier
HPC High Performance Computing
HSIC Hybrid Self Interference Cancellation
HSPA High-Speed Packet Access
HSS Home Subscriber Server
HSTD Horizontal Security and Trust Domains
HTHP High Tower High Power
HW Hardware
I-RNTI inactive RNTI
I‐CPI Intermediate‐Controller Plane Interface
I‐TAG Backbone Service Instance Tag
I2I Indoor‐to‐Indoor
IaaS Infrastructure-as-a-Service
IAB Integrated Access and Backhaul
IAD Interference‐Aware Detection
IAN Interference‐as‐Noise
IANA Internet Assigned Numbers Authority
IASD Interference‐Aware Successive Decoding
IAT Inter‐Arrival Time
IATN Inter Area Transport Node
IBB In-Band Blocking
IBFD In‐Band Full‐Duplex
IC Integrated Circuit
ICI Inter Carrier Interference
ICIC Inter‐Cell Interference Coordination
ICNIRP International Commission on Non-Ionizing Radiation Protection
ICS In-Channel Selectivity
ICT Information and Communications Technology
ID Identifier (Identity)
IDC In-Device Coexistence
IDFT Inverse Discrete Fourier Transformation
IDMA Interleave-division Multiple Access
IE Information Element
IEEE Institute of Electrical and Electronics Engineers
IETF Internet Engineering Task Force
IFOM IP Flow Mobility
IIC Industrial Internet Consortium
IIR Infinite Impulse Response
IK Integrity Key
IL Insertion Loss
IMD Inter Modulation Distortion
IMEI International Mobile Equipment Identity (23.003)
IMR Interference Measurement Resource
IMS IP Multimedia Subsystem
IMSI International Mobile Subscriber Identity (31.102)
IMT International Mobile Telecommunications
IMT-2000 International Mobile Telecommunications 2000 (ITU’s name for the family of 3G standards)
IMT-2020 International Mobile Telecommunications 2020 (ITU’s name for the family of 5G standards)
IMT-Advanced International Mobile Telecommunications Advanced (ITU’s name for the family of 4G standards)
IMT‐A IMT‐Advanced
InGaP Indium Gallium Phosphide
INR Interference-to-Noise Ratio
INT-RNTI Interruption RNTI (38.321)
IoT Internet of Things
IP Internet Protocol
IP-CAN IP Connecctivity Access Network
IP3 3rd order Intercept Point
IPr Intellectual Property
IPsec Internet Protocol Security
IPv4 Internet Protocol version 4
IPv6 Internet Protocol version 6
IQ In-phase and Quadrature
IR Incremental Redundancy
IR‐HARQ incremental redundancy HARQ
IRAT Inter-Radio Access Technology
IRC Interference Rejection Combining (Receiver)
ISC Unified Access Control
ISD Inter‐Site Distance
ISG Industry Standard Group (in ETSI)
ISI Inter Symbol Interference
ISM Industrial, Scientific and Medical
ISO International Organization for Standardization
IT Information Technology
ITRS International Telecom Roadmap for Semiconductors
ITS Intelligent Transport Systems
ITU International Telecommunication Union
ITU-R International Telecommunications Union-Radiocommunication Sector
iFFT inverse Fast Fourier Transform
JT Joint Transmission
JT CoMP Joint Transmission Coordinated Multipoint
KED Knife Edge Diffraction
KPI Key Performance Indicator
KSP Known Symbol Padding
ksps kilosymbols per second.
L1 Layer 1
L1-RSRP Layer 1 Reference Signal Receiver Power
L2 Layer 2 (data link layer)
L3 Layer 3 (network layer)
LA Link Adaptation
LA Local Area
LAA License-Assisted Access (R13 Lte feature ) – Also known as LTE-U
LADN Local Area Data Network
LBE Load Based Equipment
LBRM Limited Buffer Rate Matching
LBT Listen Before Talk
LC Inductor(L)-Capacitor
LCG Logical Channel Group
LCID Logical Channel ID (38.321)
LCP Logical Channel Prioritization
LCS Location Services
LD Linear Discriminant
LDM Local Dynamic Map
LDPC Low Density Parity Check
LDS Low Density Signature
LEMF Law Enforcement Monitoring Facility
LI Lawful Interception
LI Layer Indicator
LIPA Local IP Access
LLC Logical link control
LLR Log-likelihood Ratio
LLS-C Lower Layer Split – Control Plane
lls-CU Lower Layer Split – Central Unit
LLS-U Lower Layer Split – User Plane
LMDS Local Multipoint Distribution Service
LMF Location Management Function
LNA Low Noise Amplifier
LNF Longnormal Fading
LO Local Oscillator
LPWA Low Power Wide Area
LRC Location Reporting Control
LSA Licensed Shared Access
LSB Least Significant Bit
LSE Least Squares Estimation
LSO Lifecycle Service Orchestration
LTCC Low Temperature Co-fired Ceramic
LTE Long Term Evolution
LTE-U LTE Unlicensed (3GPP defines it as LTE-LAA)
LTE‐A Long‐Term Evolution – Advanced
LWA LTE-WLAN Aggregation
LWAAP LTE‐WLAN Aggregation Adaptation Protocol
LWIP LTE WLAN integration with IPSec tunnel (LTE/Wi‐Fi Radio Level Integration Using IPsec Tunnel)
M‐RRC Master Radio Resource Control
M2M Mobile-to-Mobile
MAC Medium Access Control (3x.321)
MAC-CE MAC control element
MAC-I Message Authentication Code for Integrity
MAN Metropolitan Area Network
MANO Management & Orchestration
MAP Maximum a Posteriori
MAPCON Multi‐Access PDN Connectivity
MAPL Maximum Allowable Path Loss
MB-MSR Multi-Band Multi Standard Radio (base station)
MBB Mobile Broadband
MBHM Map‐Based Hybrid Modeling
MBMS Multimedia Broadcast Multicast Services
MBR Maximum Bir Rate
MBSFN Multimedia (Broadcast multicast service) Single Frequency Network
MC Multi-Carrier
MCC Mission Critical Communications
MCC Mobile Country Code (286 vs.)
MCE Multi-cell/Multicast Coordination Entity
MCG Master Cell Group
MCL Maximum Coupling Loss
MCOT Maximum Channel Occupancy Time
MCP Measurement Configuration Profile
MCS Mission Critical Service
MCS Modulation and Coding Scheme
MD‐PCE Multi‐Domain Path Computation Element
MDBV Maximum Data Burst Volume
MdO Multi‐domain Orchestrator
MDT Minimization of Drive Tests
ME Multi-Edge
MEC Mobile Edge Computing or Multi‐Access Edge Computing
MeNB Master eNB
METIS Mobile and wireless communications Enablers for the Twenty‐twenty (2020) Information Society
MFBI Multiple Frequency Band Indicator
MFBR Maximum Flow Bir Rate
MIB Master Information Block
MICO Mobile Initiated Connection only (no listen to Paging)
MIMO Multiple Input Multiple Output
MIPS Million Instructions Per Second
MISO Multiple Input Single Output
ML Machine Learning
MLD Maximum Likelihood Decoding
MM Mobility Management
MMC Massive Machine Communications
MME Mobility Management Entity
MMIC Monolithic Microwave Integrated Circuit
MMIMMO Massive Multiple‐Input Massive Multiple‐Output
MMSE Minimum Mean Square Error (Receiver)
MMSE‐IRC Minimum Mean Squared Error – Interference Rejection Combining
mMTC massive Machine Type Communication
MMTel Multimedia telephony service
MN Master Node
MNC Mobile Network Code
MNO Mobile Network Operator
MO Mobile Originated
MOCN Multi Operator Core Network
MOP Maximum Output Power
MOP Multi‐Objective Optimization
MORAN Multi Operator Radio Access Network (Mobile Operator Radio Access Network)
MP Memory Polynomial
MP Message Passing
MP‐TCP Multi‐Path Transmission Control Protocol
MPC Multimedia Priority Service
MPE Maximum Permissible Exposure
MPLS Multi Protocol Label Switching
MPLS‐TP MPLS Transport Profile
MPR Maximum Power Reduction
MR-DC Multi RAT – Dual Connectivity
MRC Maximum Ratio Combining
MRT Maximum Ratio Transmission
MSB Most Significant Bit
MSE Mean‐Square‐Error
MSI Minimum System Information
MSR Multi-Standard Radio
MT Mobile Terminated
MTA Multi‐Tenancy Application
MTC Machine‐Type Communications
MTU Maximum Transmission Unit
MUSA Multiuser Shared Access
MUST Multiuser Superposition Transmission
MVNO Mobile Virtual Network Operator
MWC Mobile World Congress
N2 Control plane interface betw. RAN and core network in 5G → NG‐C
N3 User plane interface betw. RAN and core network in 5G → NG‐U
N3IWF Non 3GPPP Inter Working Function
NACK Negative Acknowledgement
NAI Network Access Identifier
NAICS Network Assisted Interference Cancellation and Suppression
NAK Negative Acknowledgment (in ARQ protocols)
NAS Non Access Stratum
NB NarrowBand
NB‐IoT NarrowBand Internet of Things
NBAP Node‐B Application Part
NBI North Bound Interface
NBIFOM Network‐Based Internet Protocol Flow Mobility
NCC Next Hop Chaining Counter
NCGI NR Cell Global Identifier
NCI NR Cell Identity
NCL Neighbor Cell List
NCO Numerically Controlled Oscillator
NCR Neighbour Cell Relation
NCRT Neighbor Cell Relation Table
NDI New-Data Indicator
NDS Network Domain Security
NE-DC NR-E-UTRA Dual Connectivity
NEA NR Encryption Algorithm
NEF Network Exposure Function
NF Network Function
NF Noise Figure
nFAPI network Functional Application Programming Interface
NFV Network Function Virtualization
NFVI Network Function Virtualization Infrastructure
NFVO NFV Orchestrator
NG Next Generation
NG The interface between the gNB and the 5G CN
ng-eNB node providing E-UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC
NG-RAN NG Radio Access Network
NG-RAN node either a gNB or an ng-eNB.
NG‐C Control plane interface betw. RAN and core network in 5G → N2
NG‐RAN Next Generation Radio Access Network
NG‐U User plane interface betw. RAN and core network in 5G → N3
NG‐Uu Interface between network and user equipment in 5G
NGAP Next Generation Application Protocol
NGEN-DC NG-RAN-E-UTRA-NR Dual Connectvity
NGFI Next Generation Fronthaul Interface
NGMN Next Generation Mobile Networks
NH Next Hop Key
NIA NR Integrity Algorithm
NIC Network Interface Controller
NLoS Non‐Line‐of‐Sight
NMSE Normalized Mean Square Error
NMT Nordisk MobilTelefon (Nordic Mobile Telephony)
NNSF Network Node Selection Function
NodeB A logical node handling transmission/reception in multiple
NOMA Non-Orthogonal Multiple Access
NR New Radio
NR-ARFCN NR Absolute Radio Frequency Channel Number
NRF Network Repository Function
NRPPa NR Positioning Protocol A
NRT Neighbour Relation Table
NS Network Service
NS Network Signaling
NS‐FAID Non‐Surjective Finite Alphabet Iterative Decoder
NSA Non StandAlone
NSD Network Service Descriptors
NSI Network Slice Instance
NSMF Network Slice Management Function
NSSAI Network Slice Selection Assistance Information
NSSF Network Slice Selection Function
NSSP Network Slice Selection Policy
NST Network Slice Template
NTN Non-terrestrial Networks
NWDAF Network Data Analytics Function
NZP CSI-RS Non-zero power CSI Reference Signal
O&M Operation and Maintenance
O2I Outdoor‐to‐Indoor
O2O Outdoor‐to‐Outdoor
OAI Open Air Interface
OAM Operations, Administration and Management/Maintenance
OBSAI Open Base Station Architecture Initiative
OBU On‐Board Unit
OBUE Operating Band Unwanted Emissions
OCB Occupied Channel Bandwidth
OCC Orthogonal Cover Code
OCNS Orthogonal Channel Noise Simulator
OEM Original Equipment Manufacturer
OF Open Flow
OFDM Orthogonal Frequency Division Multiplexing
OFDMA Orthogonal Frequency Division Multiple Access
OFNC Open‐Flow Network Controller
OLT Optical Line Terminal
OMC-ID Operation And Maintenance Centre Identity
ONF Open Networking Foundation
ONU Optical Network Unit
OOB Out Of Band
OPEX Operational Expenditures
OPS Operations
OQAM Offset Quadrature Amplitude Modulation
OSDD OTA Sensitivity Direction Declarations
OSI Open System Interconnection
OSI Other System Information (Carried on PDSCH)
OSM Open Source Management and Orchestration
OSS Operations Support System
OTA Over The Air
OTDOA Observed Time Difference Of Arrival
OTN Optical Transport Network
OTT Over The Top
OvS Open vSwitch
OVSDB Open vSwitch Database Management Protocol
P‐OFDM Pulse Shaped OFDM
PA Power Amplifier
PaaS Platform-as-a-Service
PAE Power-Added Efficiency
PAL Primary Access Licenses
PAM Pulse‐Amplitude Modulation
PAPR Peak-to-Average Power Ratio
PAR Peak-to-Average Ratio (same as PAPR)
PAs Power Amplifiers
PBB Provider Backbone Bridging
PBCH Physical Broadcast Channel
PBR Prioritised Bit Rate
PC Polar Codes
PCA Principal Component Analysis
PCB Printed Circuit Board
PCC Policy Control and Charging
PCC Primary Component Carrier
PCCH Paging Control Channel
PCell Primary Cell
PCF Policy Control Function
PCFICH Physical Control Format Indicator Channel (LTE channel)
PCG Project Coordination Group (in 3GPP)
PCH Paging Channel
PCI Physical Cell Identity
PCM Parity Check Matrices
PCO Protocol Configuration Options
PCP Priority Code Points
PCR Pilot Contamination Regime
PCRF Policy and Charging Rules Function
PDB Packet Delay Budget
PDC Personal Digital Cellular
PDCCH Physical Downlink Control Channel
PDCP Packet Data Convergence Protocol (3x.323)
PDMA Pattern-division Multiple Access
PDN Packet Data Network
PDR Packet Detection Rule
PDSCH Physical Downlink Shared Channel
PDU Protocol Data Unit
PDV Packet Delay Variation
PEI Permanent Equipment Identifier
PER Packet Error Rate
PFD Packet Flow Description
PGIA Pre‐emptive Geometrical Interference Analysis
PGW Packet Data Network Gateway
PGW PDN Gateway
PHICH Physical Hybrid ARQ Indicator Channel (LTE Channel)
PHR Power Headroom Report
PHS Personal Handy-phone System
PHY Physical Layer
PI-RNTI Paging Indicator-RNTI
PIM Passive Intermodulation
PL Path Loss (Downlink)
PLL Phase-Locked Loop
PLMN Public Land Mobile Network
PLOS Probability Loss
PLS Physical Layer Security
PM Phase Modulation
PMI Precoding Matrix Indicator
PMIP Proxy Mobile IP
PN Phase Noise
PN Polyphase Network
PNF Physical Network Function
PO Paging Occasion
PON Passive Optical Network
PoP Point of Presence
PPAC Paging Permission with Access Control
PPC Poly Phase Components
PPD Paging Policy Differentiation
PPDR Public Protection and Disaster Relief
PPF Paging Proceed Factor
PPI Paging Policy Indicator
PPI Payload Protocol Identifier (a field in SCTP)
PPI Power Preference Indicator
PPN Poly-Phase Network
PPP Public Private Partnership
PRA Physical Random Access
PRACH Physical Random Access Channel
PRB Physical Resource Block
PRG Precoding Resource Block Group
ProSe Proximity-based Services
PRS Positioning Reference Signal
PS Packet Switched
PSA PDU Session Anchor
PSAP Public Safety Answering Point
PSC Packet Scheduling
PSD Power Spectral Density
PSS Primary Synchronization Signal
PT-RS Phase Tracking – Reference Signal
PTAG Primary Timing Advance Group
PTI Precoding Type Indicator
PTM Point‐To‐Multi‐point
PUCCH Physical Uplink Control Channel
PUSCH Physical Uplink Shared Channel
PVNO Private Virtual Network Operator
PWS Public Warning System
QAM Quadrature Amplitude Modulation
QC Quasi-Cyclic
QCI QoS Class Identifier
QCL Quasi Co-Location
QFI QoS Flow Identifier
QoE Quality Of Experience
QoS Quality of Service
QPP Quadratic Permutation Polynomial
QPSK Quadrature Phase Shift Keying
RA Random Access
RA-RNTI Random Access – RNTI
RAC Radio Admission Control
RACH Random Access Channel
RAN Radio Access Network
RANAC RAN-based Notification Area Code
RAPID Random Access Preamble ID (38.321)
RAR Random Access Response
RAT Radio Access Technology
RAU Radio Aggregation Unit
RAU Routing Area Update
RB Radio Bearer
RB Resource block
RBC Radio Bearer Control
RBG Resource Block Group
RCC Radio Cloud Center
RCLWI RAN Controlled LTE WLAN Interworking
RDI Reflective QoS Flow to DRB Mapping Indication
RDN Radio Distribution Network
RE Resource Element
RE Radio Equipment (on CPRI)
REC Radio Equipment Control (on CPRI)
REFSENS Reference Sensitivity
REG Resource Element Group
REGs Resource Element Groups
REM Radio Environment Map
RF Radio Frequency
RFFE RF Front End
RFIC Radio Frequency Integrated Circuit
RFSIC Radio Frequency Self Interference Cancelation
RFSP RAT Frequency Selection Priority
RI Rank Indicator
RIB Radiated Interface Boundary
RIM RAN Information Management
RIT Radio Interface Technology
RIV Resource indicator value
RLC Radio Link Control (3x.322)
RLF Radio Link Failure
RLM Radio Link Monitoring
RM Rate Matching
RM Reed-Muller (code)
RM Resource Management
RMC Reference Measurement Channel
RMS Root Mean Square
RMSI Remaining Minimum System Information (SystemInformationBlockType1)
RNA RAN-based Notification Area
RNAU RAN-based Notification Area Update
RNC Radio Network Controller
RNE Radio Network Element
RNL Radio Network Layer
RNTI Radio Network Temporary Identifier
RNTP Relative Narrowband Transmit Power
RoAoA Range of Angle of Arrival
RoE Radio over Ethernet
ROHC RObust Header Compression
RPLMN Registered Public Land Mobile Network
RQA Reflective QoS Attribute
RQI Reflective QoS Indication
RQoS Reflective Quality of Service
RRC Radio Resource Control (3x.331)
RRH Remote Radio Head
RRM Radio Resource Management
RRS Radio Remote System
RRU Remote Radio Unit
RS Reference Signal 
RS Reference Symbol
RSC Resources Sharing Cluster
RSPC IMT-2000 Radio Interface Specifications
RSRP Reference Signal Received Power (is the power per resource element that the mobile is receiving on the cell-specific reference signals)
RSRQ Reference Signal Received Quality (expresses the signal-to-interference plus noise ratio of the cell-specific reference signals)
RSSI Received Signal Strength Indicator
RSTD Reference Signal Time Difference
RTA RAN Tracking Area
RTP Real-time Transport Protocol
RTS Ready-To-Send
RTT Round Trip Time
RU Radio Unit
RU Remote Unit
RU Resource Unit
RV Redundancy Version
RX Receiver
S-NSSAI Single Network Slice Selection Assistance Information
S-TMSI SAE – Temporary Mobile Station Identifier
S‐BVT Sliceable‐Bandwidth Variable Transponders
S‐NSSAI Single Network Slice Selection Assistance Information
S‐RRC Secondary Radio Resource Control
S1 Interface between E-UTRAN and the EPC (36.413)
S1-MME S1 for the control plane
S1-U S1 for the user plane
SA Stand Alone (NR standalone new radio)
SaaS Software-as-a-Service
SAE System Architecture Evolution
SAP Service Access Point
SAR Segmentation and Reassembly
SAR Specific Absorption Rate
SAS Spectrum Access System
SBA Service Based Architecture
sBH Self‐BackHauling
SBI Service Based Interface
SC Single Carrier
SC Superposition Coding
SC-FDMA Single Carrier – Frequency Division Multiple Access
SCC Secondary Component Carrier
SCell Secondary Cell
SCF Small Cell Forum (www.smallcellforum.org)
SCG Secondary Cell Group
SCH Shared Channel
SCH Synchronization Channel
SCM Spatial Channel Model
SCMA Sparse-code Multiple Access
SCME Spatial Channel Model Extension
SCNF Slice-specific Control Network Function
SCS Sub-Carrier Spacing
SCTP Stream Control Tranmission Protocol
SD Slice Differentiator
SD‐RAN Software-Defined Radio Access Network
SDAP Service Data Adaptation Protocol
SDF Service Data Flow
SDL Supplementary Downlink
SDM‐C Software-Defined Mobile Network Controller
SDM-O Software-Defined Mobile Network Orchestrator
SDM‐X Software-Defined Mobile Network Coordinator (Slice Aware)
SDMA Space Division Multiple Access
SDMA Spatial Division Multiple Access
SDN Software-Defined Networking
SDO Standards Developing Organization
SDP Session Description Protocol
SDR Software-Defined Radio
SDT Small Data Transmission
SDU Service Data Unit
SEAF Security Anchor Functionality
SEM Spectrum Emissions Mask
SeNB Secondary enhanced Node‐B
SEPP Security Edge Protection Proxy
SFBC Space Frequency Block Coding
SFBC Spatial‐Frequency Block Codes
SFI Slot Format Indicator
SFI-RNTI Slot Format Indicator – RNTI (38.321)
SFN Single Frequency Network
SFN System Frame Number (in 3GPP).
SFN/SF System Frame Number / Subframe
SFP Small Form-factor Pluggable
SFTD SFN and Frame Timing Difference
SgNB Secondary gNb
SGW Serving Gateway
SHF Super High Frequency
SI Self Interference
SI System Information
SI-RNTI System Information RNTI
SIB System Information Block
SIB1 System Information Block 1
SIC Self Interference Cancelation
SIC Successive Interference Cancellation
SIM Subscriber Identity Module
SIMO Single Input Multiple Output
SINR Signal to Interference plus Noise Ratio
SIP Session Initiation Protocol
SIPTO Selected IP Traffic Offloading
SIPTO@LN SIPTO at Local Network
SIR Signal-to-Interference Ratio
SISO Single Input Single Output
SIW Substrate Integrated Waveguide
SiC Silicon Carbide
SiGe Silicon Germanium
SiP System-in-Package
SLA Service Level Agreement
SLIV Start and Length Indicator Value
SM Session Management
SMA Service Monitoring & Analytics
SMC Security Mode Command
SMF Session Management Function
SMS Short Message Service
SMS Spectrum Management System
SMSF Short Message Service Function
SMT Surface-Mount Technology
SMTC SS/PBCH Block Measurement Time Configuration
SN Secondary Node (in Dual Connectivity)
SN Sequence Number
SNDR Signal to Noise-and-Distortion Ratio
SNR Signal-to-Noise Ratio
SoC System-on-Chip
SOI Silicon‐On‐Insulator
SON Self‐Organizing Network
SP Strict Priority
SP-CSI-RNTI Semi-Persistent CSI RNTI (38.321)
SPAT Signal Phase and Timing
SpCell Special Cell
SPID Subscriber Profile ID (for RAT/frequency priority)
SPM Security Policy Manager
SPS Semi-Persistent Scheduling
SPTP Small Packet Transmit Procedure
SQN Sequence Number
SR Scheduling Request
SRB Signalling Radio Bearer (carrying control plane data)
SRI Scheduling Request Indicator
SRIT Set of Radio Interface Technologies
SRM Slice Resource Manager
SRNS Serving Radio Network Subsystem
SRS Sounding Reference Signal (UL Signal)
SRVCC Single Radio Voice Call Continuity
SS Synchronization Signal
SS-RSRP SS Reference Signal Received Power
SS-RSRQ SS Reference Signal Received Quality
SS-SINR SS Signal-to-Noise and Interference Ratio
SSAC Service Specific Access Control
SSB Single Sideband
SSB Synchronization Signal and PBCH block (38.300 Abb)
SSB Synchronization Signal Block
SSC Session and Service Continuity
SSC Mode Service and Session Continuity mode
SSS Secondary Synchronization Signal
SST Slice Service Type
STAG Secondary Timing Advance Group
SU Scheduling Unit
SU Single User
SU-MIMO Single User – MIMO
SUCI Subscription Concealed Identifier
SUL Supplementary Uplink
SUPI Subscription Permanent Identifier
SVD Single Value Decomposition
SVM Support Vector Machine
SWCM Sliding‐Window Coded Modulation
SYNC Synchronization
TA Timing Advance
TA Tracking Area
TAB Transceiver-Array Boundary
TAC Tracking Area Code
TAC Transmit Access Control
TACS Total Access Communication System
TAD Traffic Aggregate Description
TAE Time Alignment Error
TAG Timing Advance Group
TAI Tracking Area Identity
TAU Tracking Area Update
TB Transport Block
TBCC Tail‐Biting Convolutional Codes
TBS Transport Block Size
TC Tariff Class (IPv& TC Byte)
TC Turbo Code
TC-RNTI Temporary C-RNTI
TCI Transmission Configuration Indicator
TCMA Trellis-Coded Multiple Access
TCP Transmission Control Protocol
TD Time Division
TD-SCDMA Time Division-Synchronous Code Division Multiple Access
TDC Transmit Datarate Control
TDD Time Division Duplex
TDM Time Division Multiplexing
TDMA Time Division Multiple Access
TDRA Time Domain Resource Allocation
TE Traffic Engineering
TEID Tunnel Endpoint Identifier
TFT Traffic Flow Template
THR Throughput
TI Transaction Identifier
TIA Telecommunication Industry Association
TIN Temporary Identity Used In Next Update
TLV Type / Length / Value
TM Transparent Mode
TMS Transmission Mode Selection
TMSI Temporary Mobile Subscriber Identity
TN Transport Node
TNeg True Negatives
TNL Transport Network Layer
TNLA Transport Network Layer Association
TO Timing Offset
TOS Type Of Service (IPv4 TOS Byte)
TOSCA Topology and Orchestration Specification for Cloud Applications
TPC Transmit Power Control
TPC-CS-RNTI Transmit Power Control-Configured Scheduling-RNTI (38.321)
TPC-PUCCH-RNTI Transmit Power Control-Physical Uplink Control Channel-RNTI
TPC-PUSCH-RNTI Transmit Power Control-Physical Uplink Shared Channel-RNTI
TPC-RNTI Transmit Power Control-RNTI
TPC-SRS-RNTI Transmit Power Control-Sounding Reference Symbols-RNTI (38.321)
TPMI Transmitted Precoding Matrix Indicator
TR Technical Report
TRC Transmit Rate Control
TrCH Transport Channel
TRP Total Radiated Power
TRP Total Received Power
TRP Transmit-Receive Point
TRS Tracking Reference Signal (CSI-RS)
TRxP Transmission and Reception Point
TS Technical Specification
TSDSI Telecommunications Standards Development Society, India
TSG Technical Specification Group
TSN Time‐Sensitive Networking
TSON Time Shared Optical Network
TSP Traffic Steering Policy
TTA Telecommunications Technology Association
TTC Telecommunications Technology Committee
TTI Transmission Time Interval
TX Transmitter
TXRU Transciever Unit (The data out of the baseband unit is transferred to Radio Distribution Unit via a special interface called TXRU.)
UCI Uplink Control Information (PUCCH)
UDM Unified Data Management
UDN Ultra‐Dense Network
UDP User Datagram Protocol
UDR Unified Data Repository
UDSF Unstructured Data Storage Function
UE User Equipment (the 3GPP name for the mobile terminal, phone)
UEM Unwanted Emissions Mask
UF‐OFDM Universal Filtered OFDM
UHD Ultra High Definition
UHF Ultra High Frequency
UICC Universal Integrated Circuit Card (SIM)
UL Uplink
UL-SCH Uplink Shared Channel
ULR-Flags Update Location Request Flags
UM Unacknowledged Mode (in RLC)
UMA Unlicensed Mobile Access
UMTS Universal Mobile Telecommunications System
UNII Unlicensed National Information Infrastructure
UP User Plane
UPF User Plane Function
UpPTS Uplink Pilot Time Slot
UPT User Perceived Throughput
URLLC Ultra Reliable and Low Latency Communication
URRP-AMF UE Reachability Request Parameter For AMF
URSP UE Route Selection Policy
USIM Universal Subscriber Identity Module
USRP Universal Software Radio Peripheral (Commercial SDR Device)
USS UE-Specific Search Space
UTC Coordinated Universal Time
UTRA Universal Mobile Telecommunications System (UMTS) Terrestrial Radio
UTRA Universal Terrestrial Radio Access
UTRAN UMTS Terrestrial Radio Access Network
UTRAN Universal Terrestrial Radio Access Network
Uu UMTS Air Interface  (Air interface between RAN and UE)
UwPTS Uplink Pilot Time Slot
V2I Vehicle-to-Infrastructure
V2N Vehicle-to-Network
V2P Vehicle-to-Pedestrian
V2V Vehicle‐to‐Vehicle
V2X Vehicle to Everything
VCO Voltage-Controlled Oscillator
VGA Variable Gain Amplifier
VI Virtualized Infrastructure
VIM Virtual Infrastructure Manager
VLAN Virtual Local Area Network
VLR Visitor Location Register
VNF Virtual Network Function
VNFM VNF Manager
VNN Vehicular Nomadic Node
VoD Verify on Demand
VoIP Voice over Internet Protocol
VoLTE Voice over LTE
VPN Virtual Private Networks
VR Virtual Reality
vRAN/VRAN Virtual Radio Access Network
VRB Virtual Resource Block
VSF Virtual Security Function
VSTD Vertical Security and Trust Domains
W‐OFDM Windowed OFDM
w.r.t With Respect To [Non Tech Abbrv.]
WAN Wide Area Network
WARC World Administrative Radio Congress
WAS Wireless Access System
WAVE Wireless Access in Vehicular Environments
WBI West Bound Interface
WCDMA Wideband Code Division Multiple Access
WDM Wavelength Division Multiplexing
WFQ Weighted Fair Queueing
WG Working Group
WIM WAN Infrastructure Manager
WIMAX Worldwide Interoperability for Microwave Access
WINNER‐II Wireless world INitiative NEw Radio phase II
Wi‐Fi  Wireless Fidelity (Technology for wireless local area networking based on IEEE 802.11 standards)
WiMAX Worldwide Interoperability for Microwave Access
WLAN Wireless Local Area Network
WP5D ITU‐R Work Package 5D
WP5D Working Party 5D
WRC World Radiocommunication Conference
WRR Weighted Round Robin
WSLM Weighted Selective Mapping Technique
WSMP WAVE Short Message Protocol
WT WLAN Termination
WTTA Wireless To The Antenna
X-MAC Computed MAC-I
X2 Interface between base stations in LTE
X2-C X2-Control Plane
X2-U X2-User Plane
X2AP X2 Application Protocol (36.423)
XaaS Everything-as-a-Service
XGPON 10‐Gigabit‐capable passive optical network
xMBB extreme Mobile BroadBand
Xn Network interface between NG-RAN nodes. (The interface between gNBs)
Xn-C Xn-Control plane (control plane interface between NG-RAN and 5GC)
Xn-U Xn-User plane (user plane interface between NG-RAN and 5GC)
XnAP Xn Application Protocol
ZC Zadoff-Chu (is a complex-valued mathematical sequence which, when applied to a signal, gives rise to a new signal of constant amplitude.)
ZCZ Zero Correlation Zone
ZF Zero Forcing (receiver)
ZP Zero Padding
ZP Zero Power
ZP‐OFDM Zero Padding OFDM
ZT Zero Tail

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