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 |
| CWDM | Coarse WDM |
| CWS | Contention Window Size |
| D-AMPS | Digital AMPS |
| 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 |
| ME‐LDPC | Multi-Edge LDPC |
| 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 |
| MU‐MIMO | Multi User MIMO |
| 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-RNTI | Paging RNTI |
| 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 | SS/PBCH block |
| 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-CSI-RS | Zero Power-CSI-RS |
| ZP‐OFDM | Zero Padding OFDM |
| ZT | Zero Tail |