(H)eNB: eNB or HeNB


(N)ES: (Network) Energy Saving


(NG)EN-DC: E-UTRA NR Dual Connectivity (covering E-UTRA connected to EPC or 5GC)


(P)T: Network Address (and Port) Translation


(R)AN: (Radio) Access Network


1xCS IWS: Single Radio Voice Call Continuity Interworking solution Function for 3GPP2 1xCS


1xCSFB: Circuit Switched Fallback to 1xRTT


1xRTT: CDMA2000 1x Radio Transmission Technology


3DOF: 3 Degrees of freedom


3DoF: Three Degrees of Freedom


3G: 3rd Generation


3GPP: Third Generation  Partnership Project


3PTY: Three-Party


3pcc: Third party call control


4G-GUTI: 4G-Globally Unique Temporary Identifier


4Rx: 4 UE receiver antenna ports


5G AV: 5G Authentication Vector


5G DDNMF: 5G Direct Discovery Name Management Function


5G GM: 5G Grand Master


5G HE AV: 5G Home Environment Authentication Vector


5G LAN: 5G Local Area Network


5G LAN-VN: 5G LAN-Virtual Network


5G NSWO: 5G Non-Seamless WLAN offload


5G PKMF: 5G ProSe Key Management Function


5G ProSe: 5G Proximity-based Services


5G Prose: 5G Proximity-based Services


5G SE AV: 5G Serving Environment Authentication Vector


5G VN: 5G Virtual Network


5G-ACIA: 5G Association for Connected Industries and Automation


5G-AN: 5G Access Network


5G-AN PDB: 5G Access Network Packet Delay Budget


5G-BRG: 5G Broadband Residential Gateway


5G-CRG: 5G Cable Residential Gateway


5G-EIR: 5G-Equipment Identity Register


5G-GUTI: 5G Globally Unique Temporary Identifier


5G-RG: 5G Residential Gateway


5G-S-TMSI: 5G S-Temporary Mobile Subscription Identifier


5G-TMSI: 5G Temporary Mobile Subscription Identifier


5G-VN: 5G Virtual Network


5GAA: 5G Automative Association


5GC: Fifth Generation core network


5GCN: 5G Core Network


5GMM: 5G Mobility Management protocol


5GMS: 5G Media Streaming


5GMS EAS: Edge-enabled 5GMS Application Server


5GMSA: 5G Media Streaming Architecture


5GMSd: 5G Media Streaming downlink


5GMSu: 5G Media Streaming uplink


5GS: 5G Systems


5GS UDR: 5G Unified Data Repository


5GSM: 5G Session Management


5GVN: 5G Virtual Network


5MBS: 5G Multicast-Broadcast Services


5QI: 5G QoS Identifier


6DoF: Six Degrees of freedom


8-VSB: 8-level Vestigial-SideBand


A-ADRF: Application layer - Analytical Data Repository Function


A-AoA: Azimuth-Angle of Arrival


A-CSI: Aperiodic CSI


A-DCCF: Application layer - Data Collection and Coordination Function


A-GNSS: Assisted-GNSS


A-KID: AKMA Key IDentifier


A-MPR: Additional Maximum Power Reduction


A-SE: Additional spurious emissions


A-SEM: Spectrum Emission Mask


A-TID: AKMA Temporary Identifier


A/S: Actuator / Sensor


A/V: Audio / Visual


A2P: Application to Person


A2X: Aircraft-to-Everything


A2XP: Aircraft-to-Everything Policy


AA: Antenna Array


AAA: Authentication, Authorization and Accounting


AAA-S: Authentication, Authorization and Accounting Server


AAC: Advanced Audio Coding


AAM: Area Airspace Manager


AAS: Antenna Array System


AAS BS: Active Antenna System Base Station


AAU: Active Antenna Unit


AAnF: Authentication and Key Management for Applications (AKMA) Anchor Function


AB: Access Barring


ABBA: Anti-Bidding down Between Architectures


ABMF: Account Balance Management Function


ABNF: Augmented Backus-Naur Form


ABR: Adaptive Bit Rate


ABS: Almost Blank Subframe


AC: Access Category or Alternating Current or Application Client


ACA: Accounting-Answer


ACDC: Application specific Congestion control for Data Communication


ACE: Application-Controlled Extension


ACID: Application Client Identification


ACIR: Adjacent Channel Interference Ratio


ACK: ACKnowledgment message


ACL: APN Control List


ACLR: Adjacent Channel Leakage Ratio


ACM: Address Complete Message


ACME: Automatic Certificate Management Environment


ACN: Ambisonic Channel Number


ACR: Application Context Relocation


ACR/CB: Anonymous Communication Rejection and Communication Barring


ACS: Auto-Configuration Server


ACT: Application Context Transfer


ADAE: Application Data Analytics Enablement


ADAEC: Application Data Analytics Enabler Client


ADAES: Application Data Analytics Enablement Services


ADC: Analog-to-Digital Converter


ADF: Accounting Data Forwarding function block


ADMF: LI Administration Function


ADN: Abbreviated Dialling Number


ADR: Accumulated Delta-Range


ADRF: Analytics Data Repository Function


ADU: Application Data Unit


AE: Authentication Extension


AEAD: Authenticated Encryption with Associated Data


AEF: API Exposing Function


AES: Advanced Encryption Standard


AF: Application Function


AF/AS: Application Function / Application server


AF_ID: Application Function Identity


AGC: Automatic gain control


AGV: Automated Guided Vehicle


AGW: Access GateWay


AI: Artificial Intelligence


AI/ML: Artificial Intelligence / Machine Learning


AICH: Acquisition Indicator CHannel


AID: Application Identifier


AILC: Assistance Information bit for Local Cache


AK: Anonymity Key


AKA: Authentication and Key Agreement


AKMA: Authentication and Key Management for Applications


AL: Aggregation level


AL FEC: Application Level FEC


AL-SDU: Application Layer - Service Data Unit


ALR: Area Loss Rate


ALW: ALWays


AM: Acknowledged Mode


AMBR: Aggregated Maximum Bitrate


AMC: Adaptive Modulation and Coding


AMD: AM Data


AMF: Access Management Function


AMN: Artificial Mains Network


AMR: Adaptive Multi Rate


AMR-NB: Adaptive Multi-Rate - NarrowBand


AMR-WB: Adaptive Multi Rate – Wide Band


AMR-WB IO: Adaptive Multi-Rate - WideBand Inter-operable Mode, included in the EVS codec


AN: Access Network


ANBR: Access Network Bitrate Recommendation


ANBRQ: Access Network Bitrate Recommendation Query


ANDS: Access Network Discovery and Selection


ANDSF: Access Network Discovery and Selection Function


ANDSF-SN: Access Network Discovery and Selection Function Server Name


ANDSP: Access Network Discovery and Selection Policy


ANID: Access Network Identity


ANL: Autonomous Network Level


ANM: ANswer Message


ANQP: Access Network Query Protocol


ANR: Automatic Neighbour Relation


AOA: Azimuth angle Of Arrival


AOC: Advice Of Charge


AOD: Azimuth angle Of Departure


AOI: Area of Interest


AOMT: AS-Originated Mobile-Terminated


AP: Access Point


APC: Antenna Phase Center


APCO: Additional Protocol Configuration Options


APF: API Publishing Function


API: Application Program Interfaces


APN: Access Point Name


APN-AMBR: APN Aggregate Maximum Bit Rate


APN-NI: APN Network Identifier


APN-OI: Access Point Name Operator Identifier


APNS: Apple Push Notification Service


APP: APPlication-defined RTCP packet


AR: Augmented Reality


ARA: Aggregated RUCI Report Answer


ARF: Augmented Reality Framework


ARFCN: Absolute Radio Frequency Channel Number


ARP: Antenna Reference Point


ARPF: Authentication credential Repository and Processing Function


ARPI: Additional RRM Policy Index


ARQ: Automatic Repeat Request


ARR: Aggregated RUCI Report Request


AR/MR: Augmented Reality / Mixed Reality


AS: Access Stratum or Application Server


AS layer: Access Stratum layer


ASA: Azimuth angle Spread of Arrival


ASCI: Advanced Speech Call Items, including VGCS, VBS and eMLPP


ASCII: American Standard Code for Information Interchange


ASCS: Adjacent Subcarrier selectivity


ASD: Azimuth angle Spread of Departure


ASIC: Application-Specific Integrated Circuit


ASK: Amplitude-shift keying


ASL: Active Speech Level


ASM: Application Service Management


ASME: Access Security Management Entity


ASN.1: Abstract Syntax Notation One


ASP: Application Service Provider


ASTC: Adaptive Scalable Texture Compression


ASTI: Access Stratum Time distribution


AT: ATtention; this two-character abbreviation is always used to start a command line to be sent from TE to TA


ATCF: Access Transfer Control Function


ATG: Air To Ground


ATGW: Access Transfer Gateway


ATIAS: Terminal Audio quality performance and Test methods for Immersive Audio Services


ATM: Asynchronous Transfer Mode


ATO: Automatic Train Operation


ATP: Automatic Train Protection


ATSC: Advanced Television Systems Committee


ATSSS: Access Traffic Steering, Switching and Splitting


ATSSS-LL: ATSSS Low-Layer


ATT: Attenuator


ATW: Asynchronous Time Warping


AUC: Authentication Centre


AUID: Application Unique IDentity


AUL: Autonomous Uplink


AUL-DFI: Autonomous UL Downlink Feedback Indication


AUL-UCI: AUL uplink control information


AUN3: Authenticable Non-3GPP devices


AUSF: Authentication Server Function


AUTN: Authentication token


AUTS: Re-synchronisation Token


AV: Authentication Vector


AV': transformed Authentication Vector


AVC: Advanced Video Coding


AVC-HD: Advanced Video Codec – High Definition


AVP: Attribute-Value Pair


AVPROD: AV Production


AW: Average Window


AWGN: Additive White Gaussian Noise


AnLF: Analytics Logical Function


AoA: Angle of Arrival


AoC: Advice of Charge


AoD: Angle-of-Departure


AoI: Area of Interest


App: Application


Att: Attempt(s,ed)


AuC: Authentication Centre


Auto-NS-LCM: Automatic Application Layer Network Slice Lifecycle Management


B-TID: Bootstrapping Transaction Identifier


B2B: Business to Business


B2B2X: Business to Business to Everything


B2BUA: Back-to-Back User Agent


B2C: Business to Consumer


BA: Bandwidth Adaptation


BAP: Backhaul Adaptation Protocol


BAR: Buffering Action Rule


BAT: Burst Arrival Time


BB: Base Band


BBERF: Bearer Binding and Event Reporting Function


BBF: Broadband Forum


BBIFF: Bearer Binding Intercept and Forward Function


BC: Band Category


BC1: Block Compression for RGB


BCCH: Broadcast Control Channel


BCD: Binary Coded Decimal


BCE: Billing and Charging Evolution


BCH: Broadcast Channel


BCM: Bearer Control Mode


BCP: Basic Communication Part


BCS: Bandwidth Combination Set


BCSM: Basic Call State Model


BD: Billing Domain


BD AIT: Baseline DNS Action Information Template


BD MDT: Baseline DNS Message Detection Template


BDN: Barred Dialling Number


BDS: BeiDou Navigation Satellite System


BDT: Background Data Transfer


BER: Bit Error Ratio


BER-TLV: Basic Encoding Rule - TLV


BFCP: Binary Floor Control Protocol


BFD: Beam Failure Detection


BFD-RS: BFD Reference Signal


BFR: Beam Failure Recovery


BG: Border Gateway


BGCF: Breakout Gateway Control Function


BH: Backhaul


BHHL: Beside Head and Hand Left Side (Head and Hand Phantom)


BHHR: Beside Head and Hand Right Side (Head and Hand Phantom)


BICC: Bearer Independent Call Control


BIPM: Bureau International des Poids et Mesures (International Bureau of Weights and Measures)


BL: Bandwidth reduced Low complexity


BL/CE: Bandwidth-reduced Low-complexity or Coverage Enhanced


BLE: Bluetooth Low Energy


BLER: Block Error Rate


BM: Beam Management


BM-RS: Beam Management Reference Signal


BM-SC: Broadcast Multicast Service Centre


BMCA: Best Master Clock Algorithm


BMFF: (ISO) Base Media File Format


BMG: Broadcast Message Gateway


BNF: Backus–Naur Form


BP: Branching Point


BPF: Band Pass Filter


BPRE: Bits Per Resource Element


BPS: Body Proximity Sensing


BPSK: Binary Phase-Shift Keying


BR: Bandwidth Reduced


BR-BCCH: Bandwidth Reduced Broadcast Control Channel


BRAS: Broadband Remote Access Server


BRID: Broadcast Remote Identification


BRIR: Binaural Room Impulse Response


BS: Base Station


BSC: Base Station Controller


BSF: Bootstrapping Server Function


BSM: Basic safety message


BSR: Buffer Status Report


BSS: Base Station Subsystem


BSSID: Basic Service Set Identifier


BT: Bluetooth


BTS: Base Transceiver Station (GERAN)


BVLOS: Beyond Visual Line of Sight


BVT: Basic Vulnerability Testing


BW: Bandwidth


BWP: Bandwidth Part


BoW: Bag-Of-visual-Words


C-DNS: Central DNS


C-IMD: Counter Intermodulation Distortion


C-MSISDN: Correlation MSISDN


C-NEF: Central NEF


C-PSA UPF: Central PSA UPF


C-RNTI: Cell RNTI


C-SGN: CIoT Serving Gateway Node


C-TEID: Common Tunnel Endpoint IDentifier


C-link: Control link


C-plane: Control Plane


C/I: Carrier-to-Interference Power Ratio


C2: Command and Control


CA: Carrier Aggregation


CAA: Civil Aviation Authorities


CAAR: Central AC Association Repository


CABW: Cumulative Aggregated Channel Bandwidth


CACLR: Cumulative Adjacent Channel Leakage Ratio


CAD: Computer Aided Design


CAG: Closed Access Group


CAG-ID: Closed Access Group Identifier


CAM: Cooperative awareness message


CAMEL: Customised Applications for Mobile network Enhanced Logic


CAP: CAMEL Application Part


CAPC: Channel Access Priority Class


CAPIF: Common API Framework for northbound APIs


CAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart


CAR: Correct Area Rate


CAS: Cloud Application Server


CAT: Customized Alerting Tone


CATR: Compact Antenna Test Range


CAZAC: Constant Amplitude Zero Auto-Correlation


CA_nX-nY: Inter-band CA of component carrier(s) in one sub-block within Band X and component carrier(s) in one sub-block within Band Y where X and Y are the applicable NR operating band


CB: Cell Broadcast


CBC: Cell Broadcast Center


CBD: Candidate Beam Detection


CBE: Cell Broadcast Entity


CBG: Code Block Group


CBGTI: Code Block Group Transmission Information


CBMID: Cell Broadcast Message Identifier


CBOR: Concise Binary Object Representation


CBP: Constrained Baseline Profile


CBR: Channel busy ratio


CBRA: Contention Based Random Access


CBRS: Citizens Broadband Radio Service


CBS: Cell Broadcast Service


CBW: Channel Bandwidth


CC: Component Carriers


CC-RNTI: Common Control RNTI


CCA: Clear Channel Assessment


CCBS: Completion of Communications to Busy Subscriber


CCCF: Call Continuity Control Function


CCCH: Common Control Channel


CCE: Control Channel Element


CCF: CAPIF Core Function


CCM: Codec Control Messages


CCNL: Completion of Communications on Not Logged-in


CCNR: Communication Completion on No Reply


CCO: Cell Change Order


CCP: Capability Configuration Parameter


CCR: Credit-Control-Request


CCS: Converged Charging System or Cross Carrier Scheduling


CD: Communication Deflection


CD-SSB: Cell Defining SSB


CDF: Charging Data Function or Cumulative Distribution Function


CDIV: Communication Diversion


CDL: Clustered Delay Line


CDM: Code division multiple


CDMA: Code Division Multiple Access


CDN: Content Delivery Network


CDP: Customer Data Platform


CDR: Charging Data Record


CE: Coverage Enhancement or Control Element


CEF: Charging Enablement Function


CEMAF: Certificate Enrolment and MAnagement Framework


CER: Capabilities Exposure Role


CES: Cloud Enabler Server


CFB: Communication Forwarding Busy


CFFDNF: Combined Far-Field / Direct-Near-Field


CFFNF: Combined Far-Field / Near-Field


CFI: Control Format Indicator


CFNL: Communication Forwarding on No Logged-in


CFNR: Communication Forwarding No Reply


CFNRc: Communication Forwarding on subscriber Not Reachable


CFO: Carrier Frequency Offset


CFR: Common Frequency Resources


CFRA: Contention Free Random Access


CFU: Communication Forwarding Unconditional


CG: Carrier Group


CG-DFI: CG - Downlink Feedback Information


CG-SDT: Configured Grant-Small Data Transmission


CG-UCI: CG - Uplink Control Information


CGF: Charging Gateway Function


CGI: Cell Global Identifier


CH: Credentials Holder


CHAP: Challenge-Handshake Authentication Protocol


CHEM: Coverage and Handoff Enhancements using Multimedia error robustness feature


CHF: CHarging Function


CHO: Conditional Handover


CHP: Constrained High Profile


CI: Cancellation Indication


CI-RNTI: Cancellation Indication RNTI


CIBR: Common Informative Binaural Renderer


CICP: Coding-independent Code Points


CID: Cell-ID (positioning method)


CIF: Carrier Indicator Field


CIM: Counter-InterModulation


CIR: Channel Impulse Response


CIS: Center for Internet Security


CIoT: Cellular Internet of Things


CJT: Coherent Joint Transmission


CK: Cipher key


CKSRVCC: Cipher Key for Single Radio Voice Continuity


CLAS: Centimetre Level Augmentation Service


CLF: Connectivity session Location and repository Function


CLI: Calling Line Identifier


CLTA: Co-Location Test Antenna


CLUE: ControLling mUltiple streams for tElepresence


CM: Connection Management


CMAF: Common Media Application Format


CMAS: Commercial Mobile Alert Service


CMC: Configuration Management Client


CMNE: Certificate Management Network Entity


CMOS: Complementary Metal-Oxide-Semiconductor


CMP: Certificate Management Protocol


CMR: Channel Measurement Resource


CMS: Configuration Management Server


CN: Core Network


CN PDB: Core Network Packet Delay Budget


CN-TL: Core Network Talker Listener function


CNAME: Canonical Name


CNAV: Civil Navigation


CNC: Centralized Network Configuration


CNF: Conjunctive Normal Form


CNI: Critical National Infrastructure


CNL: Co-operative Network List


CNN: Convolutional Neural Network


CNR: Completion of communication on No Reply


CO: Conditional Optional


CONF: CONFerence calling


CORBA: Common Object Request Broker Architecture


CORESET: Control Resource Set


CORS: Cross-Origin Resource Sharing


COT: Channel Occupancy Time


COTS: Commercial Off The Shelf


CP: Cyclic Prefix


CP-CIoT: Control Plane CIoT


CP-EDT: Control Plane EDT


CP-OFDM: Cyclic Prefix-OFDM


CP-OFDMA: Cyclic Prefix-Orthogonal Frequency-Division Multiple Access


CP-PRUK: Control Plane ProSe Remote User Key


CPA: Conditional PSCell Addition


CPAC: Conditional PSCell Addition / Change


CPBCCH: COMPACT Packet BCCH


CPC: Conditional PSCell Change


CPCF: Content Provider Charging Function


CPCN: Control Plane data transfer Charging Node (MME, SCEF, IWK-SCEF)


CPE: Common Phase Error


CPG: Call ProGress message


CPICH: Common Pilot CHannel


CPIM: Common Presence and Instant Messaging


CPM: Collective Perception Message


CPN: Customer Premises Network


CPP: Carrier Phase Positioning


CPS: Call Placement Service


CPU: Central Processing Unit


CQI: Channel Quality Indicator


CQP: Contant QP


CQRCI: Clock Quality Reporting Control Information


CR: Certificate Repository


CRB: Common Resource Block


CRC: Cyclic Redundancy Check


CRE: Cell Range Extension


CRF: Charging Rules Function


CRG: Cable Residential Gateway


CRI: CSI-RS Resource Indicator


CRL: Certificate Revocation List


CRS: Cell-specific Reference Signals


CRUD: Create, Read, Update, Delete


CRUDN: Create, Retrieve, Update, Delete and Notify


CS: Circuit Switched


CS-RNTI: Configured Scheduling RNTI


CSA: Capability Set supported by the AAS BS


CSB-ID: Crypto Session Bundle Identifier


CSC: Communication Service Customer


CSCF: Call Server Control Function


CSE: CAMEL Service Environment


CSFB: CS fallback


CSG: Closed Subscriber Group


CSG ID: Closed Subscriber Group Identity


CSI: Channel State Information


CSI-IM: CSI interference measurement


CSI-RS: Channel State Information Reference Signal


CSI-RSRP: CSI Reference Signal Received Power


CSI-RSRQ: CSI Reference Signal Received Quality


CSI-SINR: CSI Signal-to-Interference-plus-Noise Ratio


CSIF: Communication Service Interface


CSK: Client-Server Key


CSK-ID: Client-Server Key Identifier


CSMA/CD: Carrier Sense Multiple Access / Collision Detection


CSP: Communications Service Provider


CSR: Cell Site Report


CSS: Common Search Space


CSV: Comma Separated Values


CTA: Consumer Technology Association


CTC: Call for TeChnologies


CTF: Charging Trigger Function


CTF (ADF): Charging Trigger Function (Accounting Data Forwarding)


CTM: Cellular Text telephone Modem


CTR: Counter (mode)


CTS: Cordless Telephony System


CTU: Coding Tree Unit


CU: Central Unit


CUC: Centralized User Configuration


CUG: Closed User Group


CUO: Certificate Update Orchestrator


CUPS: Control and User Plane Separation


CVE: Common Vulnerabilities and Exposures


CVO: Coordination of Video Orientation


CVSS: Common Vulnerability Scoring System


CW: Continuous Wave


CWE: Common Weakness Enumeration


CeEF: Certificate Enrolment Function


CeMF: CEMAF Management Function


Cell-ID: Cell Identity


CoA: Care of Address


CoAP: Constrained Application Protocol


CoM: Centre of Mass


CoMP: Coordinated Multi Point


CoT: Chain of Trust


Conv: Conversational


D-CPICH: Demodulation Common Pilot Channel


D2D: Device to Device


DA: Distribution Automation


DAA: Detect and Avoid


DAC: Digital to Analogue Converter


DAG: Directed Acyclic Graph


DAI: Digital Audio Interface


DAP: Data Application Provider


DAPS: Dual Active Protocol Stacks


DAR: DAmage Rate


DASH: Dynamic Adaptive Streaming over HTTP


DB-DC-HSDPA: Dual Band Dual Cell HSDPA


DBI: Delay Budget Information


DC: Data Channel or Direct Current


DC-AF: Data Collection AF


DC-Client: Data Collection Client


DC-HSDPA: Dual Cell HSDPA


DC-HSUPA: Dual Cell HSUPA


DCA: Direct Communication Accept


DCAR: Data Channel Application Repository


DCCA: Diameter Credit Control Application


DCCF: Data Collection Coordination Function


DCCH: Dedicated Control Channel


DCH: Dedicated CHannel


DCI: Downlink Control Information


DCK: Depersonalisation Control Keys


DCMF: Data Channel Media Function


DCMTSI: Data Channel Multimedia Telephony Service for IMS


DCN: Dedicated Core Networks


DCP: DCI with CRC scrambled by PS-RNTI


DCQR: Downlink Channel Quality Report


DCR: Direct Communication Request


DCS: Data Channel Server


DCS-C: Control Function of Data Channel Server


DCS-M: Media Function of Data Channel Server


DCSF: Data Channel Signalling Function


DD: Data Delivery


DDAA: Direct Detect And Avoid


DDD: Downlink Data Delivery


DDDS: Downlink Data Delivery Status notification with UPF buffering


DDF: Device Description Framework


DDN: Downlink Data Notification


DDNMF: Direct Discovery Name Management Function


DDX: Downlink Data Expected


DDoS: Distributed Denial of Service


DEI: Drop Eligible Indicator


DENM: Decentralized environmental notification message


DER: Distinquished Encoding Rules


DF: Dedicated File


DFF: Direct Far Field


DFN: Direct Frame Number


DFT: Discrete Fourier Transformation


DFT-S-OFDMA: Discrete Fourier Transform-Spread-Orthogonal Frequency-Division Multiple Access


DFT-s-OFDM: Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing


DFTS: DFT Spread OFDM


DHCP: Dynamic Host Configuration Protocol


DHCPv4: Dynamic Host Configuration Protocol version 4


DHCPv6: Dynamic Host Configuration Protocol version 6


DIP: Dominant Interferer Proportion


DIS: Draft International Standard


DL: Down Link


DL TFT: DownLink Traffic Flow Template


DL-AoD: Downlink Angle-of-Departure


DL-PRS: Downlink Positioning Reference Signal


DL-RSCP: Downlink Reference Signal Carrier Phase


DL-RSCPD: Downlink Reference Signal Carrier Phase Difference


DL-SCH: Downlink Shared channel


DL-TDOA: Downlink Time Difference Of Arrival


DM: Device Management


DM-RS: Demodulation Reference Signal


DML: Data Mode Landscape


DMNP: Delegated Mobile Network Prefix


DMP: Data Mode Portrait


DMRS: Demodulation reference signal


DMSU: Data Mode Screen Up


DMTC: Discovery Signal Measurement Timing Configuration


DN: Data Network


DN-AAA: Data Network Authentication, Authorization and Accounting


DNAI: Data Network Access Identifier


DNF: Disjunctive Normal Form


DNLA: Digital Living Network Alliance


DNN: Data Network Name


DNS: Domain Name Service


DNU: Do Not Use


DO: Data Object


DO-A: Device-originated – autonomous


DO-DTT: Device-originated – device-terminated triggered


DOCSIS: Data Over Cable Service Interface Specification


DOD: Department Of Defense


DP: Delay profile


DPCK: MCData Payload Cipher Key


DPCK-ID: MCData Payload Cipher Key Identifier


DPD: Digital Pre-Distortion


DPF: Direct Provisioning Function


DPKK: MCData Payload Protection Key


DPKK-ID: MCData Payload Protection Key Identifier


DPPK: MCData Payload Protection Key


DPPK-ID: MCData Payload Protection Key Identifier


DR: Designated Router


DRA: Diameter Routing Agent


DRB: Data Radio Bearers


DRC: Dynamic Range Control


DRM: Digital Rights Management


DRMP: Diameter Routing Message Priority


DRP: Eardrum Reference Point


DRS: Discovery Reference Signal


DRVCC: Dual Radio Voice Call Continuity


DRX: Discontinous Receive


DS: Data Streaming


DS-TT: Device-side TSN translator


DSCP: Differentiated Services Code Point


DSL: Digital Subscriber Line


DSMIPv6: Dual-Stack MIPv6


DSO: Distribution System Operator


DSR: Delay Status Report


DT: Device-terminated


DTCH: Dedicated Traffic Channel


DTD: Document Type Definition


DTLS: Datagram Transport Layer Security


DTLS-SRTP: DTLS Extension to Establish Keys for SRTP


DTMB: Digital Terrestrial Multimedia Broadcast


DTMF: Dual Tone Multi-Frequency


DTS: Data Transport Service


DTT: Digital Terrestrial Television


DTTB: Digital Terrestrial Television Broadcasting


DTV: Digital Television


DTX: Discontinuous Transmission


DU: Distributed Unit


DUCK: Discovery User Confidentiality Key


DUIK: Discovery User Integrity Key


DUSK: Discovery User Scrambling Key


DUT: Device Under Test


DV: Data Volume


DVB: Digital Video Broadcast


DVB-RCS2: Second Generation DVB Interactive Satellite System


DVB-T: Digital Video Broadcasting – Terrestrial


DVD: Digital Video Disk


DVMRP: Distance Vector Multicast Routing Protocol


DeNB: Donor eNode B


DetNet: Deterministic Networking


DoF: Degrees of Freedom


DoNAS: Data over NAS


DoS: Denial of Service


DwPTS: Downlink Pilot Time Slot


E-CID: Enhanced Cell-ID (positioning method)


E-CSCF: Emergency – Call Session Control Function


E-DCH: Enhanced Uplink DCH


E-MMSE-IRC: Enhanced Minimum mean square error - interference rejection combining


E-RAB: E-UTRAN Radio Access Bearer


E-RUCCH: E-DCH Random Access Uplink Control CHannel


E-SMLC: Enhanced Serving Mobile Location Centre


E-SR-VCC: Emergency Single Radio Voice Call Continuity


E-STN-SR: Emergency Call Session Transfer Number – Single Radio


E-TM: E-UTRA Test Model


E-UTRA: Evolved Universal Terrestrial Radio Access


E-UTRA/5GC: E-UTRA connected to 5GC


E-UTRA/EPC: E-UTRA connected to EPC


E-UTRAN: Evolved Universal Terrestrial Radio Access Network


E1AP: E1 Application Protocol


E2E: End-to-End


E2EE: End to End Encryption


EAB: Extended Access Barring


EAC: Early Admission Control


EACI: ECS Address Configuration Information


EAP: Extensible Authentication Protocol


EAP-AKA': Improved Extensible Authentication Protocol method for 3rd generation Authentication and Key Agreement


EARFCN: Evolved Absolute Radio Frequency Channel Number


EAS: Edge Application Server


EASDF: Edge Application Server Discovery Function


EASID: Edge Application Server Identification


EATF: Emergency Access Transfer Function


EBCF: Event Based Charging Function


EBI: EPS Bearer Identity


EBNF: Extended Backus-Naur Form


EC: Emergency Centre


EC-GSM-IoT: Extended coverage in GSM for IoT


ECCSI: Elliptic Curve-based Certificateless Signatures for Identity-based Encryption


ECEF: Earth-Centered, Earth-Fixed


ECF: Event Charging Function


ECGI: E-UTRAN Cell Global Identifier


ECI: E-UTRAN Cell Identity


ECIES: Elliptic Curve Integrated Encryption Scheme


ECM: EPS Connection Management


ECMA: European Computer Manufacturers Association


ECN: Explicit Congestion Notification


ECN-CE: ECN Congestion Experienced


ECRP: Ear Cap Reference Point


ECS: Edge Configuration Server


ECS-ER: Edge Configuration Server – Edge Repository


ECSP: Edge Computing Service Provider


ECT: Explicit Communication Transfer


ECUR: Event Charging with Unit Reservation


EDB: End of Data Burst


EDC: Edge DNS Client


EDGAR: EDGe-Dependent AR


EDGE: Enhanced Data rates for GSM Evolution


EDGEAPP: Edge Application


EDI: Edge Deployment Information


EDN: Edge Data Network


EDNS: Extension mechanisms for DNS


EDT: Early Data Transmission


EE: Energy Efficiency


EEC: Edge Enabler Client


EECID: Edge Enabler Client IDentifier


EEL: Edge Enabler Layer


EENLV: Extended Emergency Number List Validity


EEP: Ear Entrance Point


EES: Edge Enabler Server


EESID: Edge Enabler Server Identification


EF: Elementary File


EGMF: Exposure Governance Management Function


EGNOS: European Geostationary Navigation Overlay Service


EGPRS: EDGE General Packet Radio Service


EGQM: Enhanced Goal, Question, Metric


EHC: Ethernet Header Compression


EHE: Edge Hosting Environment


EHPLMN: Equivalent Home Public Land Mobile Network


EIR: Equipment Identity Register


EIRP: Equivalent Isotropic Radiated Power


EIS: Effective Isotropic Sensitivity


EKU: Extended Key Usage


EL: Echo Loss


EM: Element Management


EMC: Electromagnetic Compatibility


EME: Encrypted Media Extension


EMM: EPS Mobility Management


EMS: Emergency Services


EMSA: Streaming Architecture extensions for Edge processing


EMSK: Extended Master Session Key


EN-DC: E-UTRA-NR Dual Connectivity


ENB: Evolved Node B


ENBW: The aggregated bandwidth of an E-UTRA sub-block and an adjacent NR sub-block


ENS: Edge Notification Server


ENSI: External Network Slice Information


ENUM: E.164 Number Mapping


EOC: Emergency Operations Center


EOP: Earth Orientation Parameters


EOTF: Electro-Optical Transfer Function


EP: Elementary Procedure


EPA: Event Publication Agent


EPC: Enhanced Packet Core


EPD: Extended Protocol Discriminator


EPDCCH: Enhanced Physical Downlink Control channel


EPDU: External Protocol Data Unit


EPLMN: Equivalent PLMN


EPON: Ethernet Passive Optical Network


EPRE: Energy per resource element


EPS: Evolved Packet Core System


EPS UDR: EPS User Data Repository


EPS-UPIP: User-plane integrity protection in EPS


ER: Edge Repository


ERP: EAP Re-authentication Protocol


ESC: Event State Compositor


ESD: Electrostatic Discharge


ESM: EPS Session Management


ESMA: European Securities and Markets Authority


ESP: Encapsulating Security Payload


ESQK: Emergency Service Query Key


ESRK: Emergency Service Routing Key


ESRN: Emergency Service Routing Number


ETC: E-UTRA Test Configuration


ETC2: Ericsson Texture Compression version 2


ETSI: European Telecommunications Standards Institute


ETU: Extended Typical Urban model


ETWS: Earthquake and Tsunami Warning System


EUI: Extended Unique Identifier


EUT: Equipment Under Test (UE or UE with ancillaries)


EUTRAN: Evolved UMTS Terrestrial Radio Access Network


EVA: Enhanced Vulnerability Analysis


EVC: Essential Video Coding


EVM: Error Vector Magnitude


EVS: Enhanced Voice Services


Estab: Establish (ed,ment)


F-SEID: Fully Qualified SEID


F-TEID: Fully Qualified Tunnel Endpoint Identifier


F1-C: F1 Control plane interface


F1-U: F1 User plane interface


F1AP: F1 Application Protocol


FA: Functional Alias


FAC: Fully Anechoic Chamber


FACH: Forward Access CHannel


FACoA: Foreign Agent Care-of-Address


FAP: cdma2000® 1x Femtocell Access Point


FAR: Forwarding Action Rule


FASMO: Frequent and Serious Misoperation


FB: Fullband


FBC: Flow Based Charging


FBW: Fractional Bandwidth


FCC: Federal Communications Commission


FCM: Firebase Cloud Messaging


FCP: File Control Parameters


FCS: Frame Check Sequence


FD: File Distribution


FD-CDM: Frequency division - code division multiple


FDD: Frequency Division Duplexing


FDIS: Final Draft International Standard


FDM: Frequency Division Multiplexing


FDMA: Frequency Division Multiple Access


FDN: Fixed Dialling Number


FDRA: Frequency domain resource allocation


FEC: Forward Error Correction


FECC: Far End Camera Control


FF: Far-Field


FFS: For Further Study


FFT: Fast Fourier Transformation


FIFO: First In, First Out


FIPS: Federal Information Processing Standard


FIR: Finite Impulse Response


FIRST: Forum for Incident Response and Security Team


FKP: (German) Flächen-Korrektur-Parameter (area correction parameter)


FL: Federated Learning


FLL: Frequency Locked Loop


FLOP: Floating point Operation*


FLR: Frame Loss Rate


FLS: Fused Location Server


FLUS: Framework for Live Uplink Streaming


FLUTE: File Delivery over Unidirectional Transport


FM: Fault Management


FMSS: Flexible Mobile Service Steering


FN-BRG: Fixed Network Broadband Residential Gateway


FN-CRG: Fixed Network Cable Residential Gateway


FN-RG: Fixed Network Residential Gateway


FOA: First Order Ambisonics


FOSS: Free Open-Source Software


FOV: Field Of View


FPACH: Fast Physical Access CHannel


FPS: First Person Shooter


FQDN: Fully Qualified Domain Name


FQPC: Fully Qualified Partial CDR


FR: Frequency Range


FR1: Frequency Range 1


FR2: Frequency Range 2


FRC: Fixed Reference Channel


FRER: Frame Replication and Elimination for Reliability


FRF: Frequency Reuse Factor


FS: Free Space


FSA: Frequency Selection Area


FSA ID: Frequency Selection Area Identity


FSK: Frequency-shift keying


FSOATS: Free Space OATS


FSPC: Feature Set Per Component-carrier


FSS: Fixed Satellite Services


FTA: Fine Time Assistance


FTAM: File Transfer, Access and Management


FTEID: Fully Qualified TEID


FTM: Frame Tunnelling Mode


FTP: File Transfer Protocol


FWA: Fixed Wireless Access


FoIP: Facsimile over IP


FoV: Field of view


G-CS-RNTI: Group Configured Scheduling RNTI


G-MOS-LQOfb: Global (Overall) - Mean Opinion Score - Listening Quality Objective - Fullband


G-MOS-LQOn: Global (Overall) - Mean Opinion Score - Listening Quality Objective - Narrowband


G-MOS-LQOw: Global (Overall) - Mean Opinion Score - Listening Quality Objective - Wideband


G-PCC: Geometry-based Point Cloud Compression


G-PDU: GTP encapsulated user Plane Data Unit


G-RNTI: Group RNTI


GAA: Generic Authentication Architecture


GAD: Universal Geographical Area Description


GAGAN: GPS Aided Geo Augmented Navigation


GBA: Generic Bootstrapping Architecture


GBA_ME: ME-based GBA


GBA_U: GBA with UICC-based enhancements


GBR: Guaranteed Bit Rate


GC: General Client


GCI: Global Cable Identifier


GCID: GPRS Charging Identifier


GCS: Global Coordinate System


GCS AS: Group Communication Service Application Server


GCSE_LTE: Group Communication Service Enabler over LTE


GDPR: General Data Protection Directive


GDR: Gradual Decoder Refresh


GEO: Geostationary Earth Orbiting


GERAN: GSM EDGE Radio Access Network


GF: Grant-Free


GFBR: Guaranteed Flow Bit Rate


GGSN: Gateway GPRS Support Node


GIBA: GPRS-IMS-Bundled-Authentication


GIN: Group ID for Network Selection


GIP: Generic IP access


GKTP: Group Key Transport Payload


GLI: Global Line Identifier


GLMS: Group and List Management Server


GLONASS: GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)


GMC: Group Management Client


GMD: Group Message Delivery


GMK: Group Master Key


GMK-ID: Group Master Key Identifier


GMLC: Gateway Mobile Location Centre


GMM: GPRS Mobility Management


GMOP: Group Management OPeration


GMS: Group Management Server


GMSC: Gateway MSC


GNP: Generic Network Product


GNSS: Global Navigation Satellite Systems


GOB: Group Of Blocks


GOOSE: Generic Object-Oriented Substation Event


GP: Guard Period (for E-UTRA TDD operation)


GPI: GBA Push Information


GPON: Gigabit-capable Passive Optical Networks


GPRS: General Packet Radio Service


GPS: Global Positioning System


GPSI: Generic Public Subscription Identifier


GPU: Graphics Processing Units


GRE: Generic Routing Encapsulation


GRS80: Geodetic Reference System 1980


GRUU: Globally Routable User agent URIs


GS: Group Specification


GSCN: Global Synchronization Channel Number


GSF: Generic Security Functionality


GSM: Global System for Mobile Communications


GSMA: GSM Association


GSN: GPRS Support Node (either SGSN or GGSN)


GSO: Geostationary-Satellite Orbit


GST: Generic Network Slice Template


GTP: GPRS Tunnelling Protocol


GTP-C: GPRS Tunnelling Protocol for Control Plane


GTP-PDU: GTP-C PDU or GTP-U PDU


GTP-U: GPRS Tunnelling Protocol for user plane


GTPv2-C: GTP version 2, control plane


GTPv2-U: GTP version 2, user plane


GUAMI: Globally Unique AMF Identifier


GUI: Graphical User Interface


GUID: Globally Unique Identifer


GUK-ID: Group User Key Identifier


GUMMEI: Globally Unique MME Identifier


GUP: Generic User Profile


GUSS: GBA User Security Settings


GUTI: Globally Unique Temporary Identifier


GVNP: Generic Virtualized Network Product


GW: Gateway


GWCN: GateWay Core Network


GWUS: Group Wake Up Signal


GZIP: GNU ZIP


Gbps: Gigabits per second


H(e)NB: Home Node B or Home evolved Node B


H-AF: Home AF


H-ANDSF: Home-ANDSF


H-ARQ: Hybrid - ARQ


H-CHF: A CHF in HPLMN


H-DRA: Home DRA


H-ECS: Home Edge Configuration Server


H-EES: Home Edge Enabler Server


H-PCF: Home Policy Control Function


H-PCRF: Home PCRF


H-SFN: Hyper System Frame Number


H-SMF: Home SMF


H-UDR: A UDR in the HPLMN


HA: Home Agent


HA GNSS: High-Accuracy GNSS (RTK, PPP)


HAAT: Height Above Average Terrain


HAL: Hypertext Application Language


HAPS: High Altitude Platform Station


HARQ: Hybrid automatic repeat request


HARQ-ACK: Hybrid Automatic Repeat reQuest Acknowledgement


HATEOAS: Hypermedia as the Engine of Application State


HATS: Head and Torso Simulator


HBM: Host-based Mobility


HBRT: Hardware Based Root of Trust


HCL: Higher Communication Layer


HCP: Horizontal Coupling Plane


HD: High Definition


HD-FDD: Half- Duplex FDD


HD-HDR: High Definition and High Dynamic Range


HDCA: High Density Camera Array


HDR: High Dynamic Range


HDTV: High Definition TeleVision


HE: Home Environment


HEO: Highly-Eccentric Orbiting satellites


HESSID: Homogenous Extended Service Set Identifier


HEVC: High Efficiency Video Coding


HFC: Hybrid Fiber-Coaxial


HFN: Hyper Frame Number


HGMLC: Home GMLC


HHO: Hard Handover


HI: HARQ indicator


HL: Hand Left (Hand Phantom Only)


HLG: Hybrid Log-Gamma


HLR: Home Location Register


HLS: HTTP Live Streaming


HMD: Head-Mounted Display


HMEE: Hardware Mediated Execution Enclave


HMI: Human Machine Interface


HMTC: High-Performance Machine-Type Communications


HN: Home Network


HNB: Home NodeB


HO: Handover


HOA: High Order Ambisonics


HOF: Handover Failure


HOLD: Communication Hold


HONTRA: HOme Network TRiggered Authentication


HPL: Horizontal Protection Level


HPLMN: Home Public Land Mobile Network


HPSIM: Hosting Party Subscription Identity Module


HR: Home Routed (roaming)


HR-SBO: Home Routed Session BreakOut


HRD: Hypothetical Reference Decoder


HRES: Hash RESponse


HRIR: Head-Related Impulse Responses


HRNN: Human-Readable Network Name


HRPD: CDMA2000 High Rate Packet Data


HRTF: Head Related Transfer Function


HS-DSCH: High Speed Downlink Shared Channel


HS-GW: HRPD Serving GW


HSCSD: High Speed Circuit Switched Data


HSDN: High Speed Dedicated Network


HSDPA: High Speed Downlink Packet Access


HSGW: eHRPD Serving Gateway


HSM: Hardware Security Module


HSS: Home Subscriber Server


HST: High Speed Train


HSUPA: High Speed Uplink Packet Access


HTML: HyperText Markup Language


HTTP: Hypertext Transfer Protocol


HTTPS: HyperText Transfer Protocol Secure


HUD: Heads-Up Display


HW: HardWare


HXRES: Hash eXpected RESponse


HaNTE: Handsets featuring Non-Traditional Handsets


HeNB: Home eNodeB


HeNB GW: Home eNode B Gateway


I-CSCF: Interrogating CSCF


I-RNTI: Inactive RNTI


I-SMF: Intermediate SMF


I-UPF: Intermediate UPF


I-WLAN: Interworking – WLAN


IA: Incoming Access


IAAS: Infrastructure As A Service


IAB: Integrated Access and Backhaul


IAB-DU: IAB Distribution Unit


IAB-MT: Integrated Access Backhaul Mobile Termination


IAK: Initial Authentication Key


IAM: Initial Address Message


IANA: Internet Assigned Numbers Authority


IARI: IMS Application Reference Identifier


IARP: Inter-APN Routing Policy


IAT: Inter arrival times


IBB: In-band Blocking


IBC: International Broadcasting Convention


IBCF: Interconnect Border Control Function


IBE: In-Band Emission


IBM: Independent Beam Management


IC: Integrated Circuit


ICB: Incoming Communication Barring


ICC: Integrated Circuit Card


ICD: Interface Control Document


ICE: In Case of Emergency


ICF: Identity Caching Function


ICI: Incoming Call Information


ICIC: Inter-Cell Interference Coordination


ICID: IM CN subsystem Charging Identifier


ICM: Initial Codec Mode


ICMP: Internet Control Message Protocol


ICP: Internet Content Provider


ICS: Implementation Conformance Statement or In-Channel Selectivity


ICSI: IMS Communication Service Identifier


ICT: Incoming Call Timer


ID: Identification


IDC: In-Device Coexistence


IDFT: Inverse Discrete Fourier Transformation


IDL: Interface Definition Language


IDMS: Inter-destination Multimedia Synchronization


IDP: Initial Detection Point


IDR: Instantaneous Decoding Refresh


IE: Information Element


IEC: Immediate Event Charging


IEEE: Institute of Electrical and Electronics Engineers


IEF: Identity Event Function


IEI: Information Element Identifier


IETF: Internet Engineering Task Force


IF: Intermediate Frequency


IFC: Initial Filter Criteria


IFF: Indirect Far Field


IFFT: Inverse FFT


IFOM: IP Flow Mobility


IFP: Internet Facsimile Protocol


IFRI: Intra Frequency Reselection Indication


IFT: Internet Facsimile Transfer


IGMP: Internet Group Management Protocol


IGS: International GNSS Service


II-NNI: Inter-IMS Network to Network Interface


IIoT: Industrial Internet of Things


IK: Integrity Key


IKE: Internet Key Exchange


IKEv2: Internet Key Exchange Protocol Version 2


IKSRVCC: Integrity Key for Single Radio Voice Continuity


IM: Instant Messaging


IM CN: IP Multimedia Core Network


IM CN SS: IP Multimedia Core Network Subsystem


IM-MGW: IM Media Gateway


IMC: IMS Credentials


IMD: Inter-Modulation Distortion


IMEI: International Mobile Equipment Identity


IMEI-SV: International Mobile Equipment Identity Software Version


IMEI-TAC: IMEI Type Allocation Code


IMEI/TAC: IMEI Type Allocation Code


IMEISV: International Mobile station Equipment Identity and Software Version number


IMPI: IP Multimedia Private Identity


IMPU: IMS Public User Identity


IMR: Interference Measurement Resource


IMRN: IP Multimedia Routing Number


IMS: IP Multimedia Subsystem


IMS ALG: IMS Application Level Gateway


IMS AS: IP Multimedia Subsystem Application Server


IMS GWF: IMS GateWay Function


IMS UE: IMS User Equipment


IMS-: IMS Application Level Gateway


IMS-AGW: IMS Access Media Gateway


IMS-ALG: IMS - Application Level Gateway


IMS-GWF: IMS Gateway Function


IMSC: Internet Media Subtitles and Captions


IMSI: International Mobile Subscriber Identifier


IMSVoPS: IMS Voice over PS Session


IMU: Inertial Measurement Unit


IN: Intelligent Network


INT-RNTI: Interruption RNTI


IOC: Information Object Class


IOD: Inter-aural Output Difference


IOI: Inter Operator Identifier


IOPS: Isolated E-UTRAN Operation for Public Safety


IP: Internet Protocol


IP-CAN: IP-Connectivity Access Network


IP-SM-GW: IP Short Message Gateway


IPCP: IP Control Protocol (PPP NCP for IPv4)


IPEG: In-Progress Emergency Group


IPEPC: In-Progress Emergency Private Call


IPIG: In-Progress Imminent peril Group


IPMS: IP Mobility Mode Selection


IPUPS: Inter PLMN UP Security


IPV6CP: IPv6 Control Protocol (PPP NCP for IPv6)


IPX: IP exchange service


IPsec: Internet Protocol Security


IPv4: Internet Protocol version 4


IPv6: Internet Protocol version 6


IQ: In-phase - Quadrature phase


IQF: Identity Query Function


IRA: International Reference Alphabet


IRAP: Intra Random Access Point


IRC: Interference Rejection Combining


IRFFT: Inverse RFFT


IRI: Intercept Related Information


IRNSS: Indian Regional Navigation Satellite System


IRP: Integration Reference Point


IS: Information Service


ISC: IP Multimedia Subsystem Service Control


ISCP: Interference on Signal Code Power


ISD: Intersite Distance


ISDB-T: Integrated Services Digital Broadcasting – Terrestrial


ISDN: Integrated Services Digital Network


ISG: Industry Specification Group


ISIM: IM Subscriber Identity Module


ISL: Inter-Satellite Links


ISM: Industrial, Scientific and Medical


ISMP: Inter-system Mobility Policy


ISO: International Standards Organization


ISO BMFF: ISO Based Media File Format


ISOBMFF: ISO Based Media File Format


ISP: Internet Service Provider


ISR: Idle mode Signalling Reduction


ISRP: Inter-system Routing Policy


ISUP: Integrated Service digital network User Part


IT: Information Technology


ITS: Intelligent Transport Systems


ITS-AID: ITS Application Identifier


ITSI: Individual TETRA Subscriber Identity


ITT4RT: Immersive Teleconferencing and Telepresence for Remote Terminals


ITU: International Telecommunication Union


ITU-R: Radiocommunication Sector of the International Telecommunication Union


ITU-T: International Telecommunication  - Telecommunications Standardisation Sector


IUT: Inter UE Transfer


IVAS: Immersive Voice and Audio Services


IVS: In Vehicle System (eCall terminal and associated sub-systems in vehicle)


IWF: InterWorking Function


IWK-SCEF: Interworking - SCEF


IXIT: Implementation extra Information for Testing


IdM: Identity Management


IdMS: Identity Management Server


IdP: Identity Provider


Idi: Identity of the initiator


Idr: Identity of the responder


InK: Integrity Key


InK-ID: Integrity Key Identifier


Inter: Inter


InterKMRec: Interworking Key Management Record


InterKMRec-ID: Interworking Key Management Record Identifier


InterSD: Interworking Security Data


Intra: Intra


IoT: Internet of Things


IoT-NTN: Internet of Things Non-Terrestrial Networks


IrDA: Infrared Data Association


Iuant: E-Node B internal logical interface between the implementation specific O&M function and the RET antennas and TMAs control unit function of the E-Node B


JBM: Jitter Buffer Management


JOSE: Javascript Object Signing and Encryption


JPEG: Joint Photographic Experts Group


JSON: JavaScript Object Notation


JVET: Joint Video Exploration Team


JWE: JSON Web Encryption


JWS: JSON Web Signature


JWT: JSON Web Token


KAF: AKMA Application Key


KAKMA: AKMA Anchor Key


KC: Cryptographic key used by the cipher A5


KDF: Key Derivation Function


KEK: Key Encryption Key (TETRA)


KFC: Key For Control Signalling


KFC-ID: Key for Floor Control Identifier


KI: Key Issue


KID: Key IDentifier


KISS: Key Indicator for Service Selection


KLI: Decryption key(s) for services encrypted by CSP-provided keys


KMS: Key Management Server


KPAK: KMS Public Authentication Key


KPAS: Korean Public Alert System


KPI: Key Performance Indicator


KQI: Key Quality Indicators


KSF: Key Server Function


KSI: Key Set Identifier


KSISRVCC: Key Set Identifier for Single Radio Voice Continuity


Kc: 64-bit GSM ciphering key


Kc128: 128-bit GSM ciphering key


Kint: 128-bit GSM integrity key


Ks: Key material


Ks_NAF: NAF specific key material


Ks_ext_NAF: Derived key in GBA_U


Ks_int_NAF: Derived key in GBA_U which remains on UICC


L-DN: Local part of DN


L-DNS: Local DNS


L-GW: Local Gateway


L-NEF: Local Network Exposure Function


L-PSA UPF: Local PSA UPF


L-UPF: Local User Plane Function


L-W-CP: Legacy Wireless access Control Plane Protocol


L-W-UP: Legacy Wireless access User Plane Protocol


L1: Layer 1


L1 SL-RSRP: Layer 1 Sidelink RSRP which corresponds to PSCCH-RSRP and / or PSSCH-RSRP


L1-RSRP: Layer 1 Reference Signal Received Power


L2: Layer-2


L2TP: Layer Two Tunneling Protocol


L3: Layer 3


L3G: Legacy 3GPP Message Gateway


L4S: Low Latency, Low Loss and Scalable Throughput


LA: Local Area


LAA: Licensed-Assisted Access


LAC: Location Area Code


LADN: Local Area Data Network


LAF: Location Acquisition Function


LALS: Lawful Access Location Services


LAN: Local Area Network


LARF: Location Acquisition Requesting Function


LB: Load Balancing


LBI: Linked EPS Bearer ID


LBO: Local Break Out (roaming)


LBT: Listen Before Talk


LC: Load Control


LC-H: Load Control based on LCI Header


LCG: Logical Channel Group


LCI: Load Control Information


LCID: Logical Channel IDentifier


LCL: Lower Communication Layer


LCM: Lifecycle Management


LCP: Logical Channel Prioritization


LCR: Low Chip Rate


LCS: Location Services


LCS-AP: LCS Application Protocol


LCS-UPP: Location Services User Plane Protocol


LCUP: LCs User Plane


LDN: Local Distinguished Name


LDPC: Low Density Parity Check


LDR: Location Deferred Request


LEA: Law Enforcement Agency


LEMF: Law Enforcement Monitoring Facility


LEO: Low-Earth Orbit


LFE: Low Frequency Enhancement


LGW: Local Gateway


LHN: Local Home Network


LHN ID: Local Home Network ID


LHN-ID: Local Home Network Identifier


LHO: Legacy Handover


LI: Language Indication


LI CA: Lawful Interception Certificate Authority


LICF: Lawful Interception Control Function


LIDAR: LIght Detection And Ranging


LIID: Lawful Interception Identifier


LIPA: Local IP Access


LIPF: Lawful Interception Provisioning Function


LIR: Location Immediate Request


LISN: Line Impedance Stabilizing Network


LISSF: Lawful Interception State Storage Function


LI_HI1: Lawful Interception Handover Interface 1


LI_HI2: Lawful Interception Handover Interface 2


LI_HI3: Lawful Interception Handover Interface 3


LI_HI4: Lawful Interception Handover Interface 4


LI_HILA: Lawful Interception Handover Interface Location Acquisition


LI_HIQR: Lawful Interception Handover Interface Query Response


LI_SI: Lawful Interception System Information Interface


LI_ST: Lawful Interception State Transfer Interface


LI_T1: Lawful Interception Internal Triggering Interface 1


LI_T2: Lawful Interception Internal Triggering Interface 2


LI_T3: Lawful Interception Internal Triggering Interface 3


LI_X0: Lawful Interception Internal Interface 0


LI_X1: Lawful Interception Internal Interface 1


LI_X2: Lawful Interception Internal Interface 2


LI_X2_LA: Lawful Interception Internal Interface 2 Location Acquisition


LI_X3: Lawful Interception Internal Interface 3


LI_X3A: Lawful Interception Internal Interface 3 Aggregator


LI_XEM1: Lawful Interception Internal Interface Event Management Interface 1


LI_XER: Lawful Interception Internal Interface Event Record


LI_XLA: Lawful Interception Internal Interface Location Acquisition


LI_XQR: Lawful Interception Internal Interface Query Response


LL SSM: Lower Layer SSM


LLA: Latitude Longitude Altitude


LLC SM: Low Layer Source Specific Multicast (address)


LLDP: Local Loop Demarcation Protocol


LLS: Link-level Simulation


LMA: Local Mobility Anchor


LMC: Location Management Client


LMF: Location Management Function


LMISF: LI Mirror IMS State Function


LMISF-CC: LMISF for the handling of CC


LMISF-IRI: LMISF for the handling of IRI


LMR: Land Mobile Radio


LMS: Location Management Server


LMU: Location Measurement Unit


LNA: Low Noise Amplifier


LNS: L2TP Network Server


LO: Local Oscillator


LOS: Line-of-Sight


LP-SS: Low Power- Synchronization Signal


LP-WUR: Low Power-Wake Up Receiver


LP-WUS: Low Power-Wake Up Signal


LPF: Low Pass Filter


LPHAP: Low Power High Accuracy Positioning


LPI: LCS Privacy Indicator


LPP: LTE Positioning Protocol


LPPa: LTE Positioning Protocol Annex


LPPe: LPP extension


LPTV: Low Power TeleVision


LPWA: Low-power, wide-area


LR: Location Registration


LRF: Location Retrieval Function


LRO: Last Routing Option


LS: Location Server


LSA: Localised Service Areas


LSB: Least Significant Bit


LSR: Late Stage Reprojection


LSTR: Listener Sidetone Rating


LTCC: Low Temperature Co-fired Ceramic


LTE: Long Term Evolution


LTE-MTC: Long Term Evolution – Machine Type Communication


LTF: Location Triggering Function


LTM: L1 / L2 Triggered Mobility


LUN: Local USS Network


LWA: LTE-WLAN Aggregation


LWAAP: LTE-WLAN Aggregation Adaptation Protocol


LWIP: LTE WLAN Radio Level Integration with IPsec Tunnel


LWIP-SeGW: LWIP Security Gateway


LWP: Light-weight Protocol


LoA: Level of Automation


LoS: Line of Sight


M-NG-RAN node: Master NG-RAN node


M-RNTI: MBMS RNTI


M-TMSI: M-Temporary Mobile Subscriber Identity


MA: Multi-Access


MA PDU: Multi-Access PDU


MAC: Medium Access Control


MAC-A: MAC used for authentication and key agreement


MAC-I: Message Authentication Code for Integrity


MACN: Multi Access Core Network


MAE: Mean Absolute Error


MAF: Media Access Function


MAG: Mobile Access Gateway


MAI: Measurement Assistance Information


MANO: Management and Orchestration


MAP: Mobile Application Part


MAPCON: Multi Access PDN Connectivity


MAR: Multi-Access Rule


MASA: Metadata-Assisted Spatial Audio


MASC: MIMO Average Spherical Coverage


MAX: Maximum volume setting


MB-MSR: Multi-Band Multi-Standard Radio


MB-SMF: Multicast / Broadcast Session Management Function


MB-UPF: Multicast Broadcast User Plane Function


MBCP: Media Burst Control Protocol


MBMS: Multimedia Broadcast Multicast Services


MBR: Maximum Bit Rate


MBS: Multicast Broadcast Services


MBS FSAI: MBS Frequency Selection Area Identity


MBSF: Multicast / Broadcast Service Function


MBSFN: Multicast-broadcast single-frequency network


MBSR: Mobile Base Station Relay


MBSSF: Multicast / Broadcast Service Security Function


MBSTF: Multicast / Broadcast Service Transport Function


MBT: Multi-Band Testing


MBW: Maximum Bandwidth


MC: Mission Critical or Multi-channel


MC ID: Mission Critical user identity


MC-ASK: Multiple Carrier-Amplitude Shift Keying


MC-FSK: Multiple Carrier-Frequency Shift Keying


MCC: Mobile Country Code


MCCH: MBS Control Channel


MCCH-RNTI: MBS Control Channel RNTI


MCCoRe: Mission Critical Services Common Requirements


MCData: Mission Critical Data


MCData ID: MCData user identity


MCData group ID: MCData group Identity


MCE: Measurement Collector Entity


MCG: Master Cell Group


MCH: Multicast Channel


MCID: Malicious Communication IDentification


MCL: Minimum Coupling Loss


MCM: Multi-connection mode


MCMC: Mission Critical MBMS subchannel Control Protocol


MCOT: Maximum Channel Occupancy Time


MCPTT: Mission Critical Push to Talk Service


MCPTT AS: MCPTT Application Server


MCPTT ID: MCPTT user identity


MCPTT group ID: MCPTT group identity


MCS: Modulation and Coding Scheme


MCSC: Mission Critical MBS subchannel Control Protocol


MCSs: Mission Critical Services


MCU: Multipoint Control Unit


MCVideo: Mission Critical Video


MCVideo group ID: MCVideo group Identity


MCX: Mission Critical Services


MCX Service: Mission Critical Service


MDA: Management Data Analytics


MDA MnS: MDA Management service


MDAF: Management Data Analytics Function


MDAS: Management Data Analytics Service


MDBV: Maximum Data Burst Volume


MDCA: Management Data Correlation Analytics


MDD: MSE Description Document


MDEA: MCData Emergency Alert


MDEG: MCData Emergency Group


MDEGC: MCData Emergency Group Communication


MDEPC: MCData Emergency Private (one-to-one) Communication


MDEPP: MCData Emergency Private (one-to-one) Priority


MDES: MCData Emergency State


MDF: Mediation and Delivery Function


MDF2: Mediation and Delivery Function 2


MDF3: Mediation and Delivery Function 3


MDIG: MCData Imminent peril Group


MDIGC: MCData Imminent peril Group Communication


MDPEA: MCData Private (one-to-one) Emergency Alert


MDR: Miss Detection Rate


MDT: Minimization of Drive Tests


ME: Mobile Equipment


MEA: MCPTT Emergency Alert


MEAO: MEC Application Orchestrator


MEC: Multi-access Edge Computing


MECAPP: MEC Application


MECRP: Manufacturer-defined Ear Cap Reference Point


MEF: MEC Federator


MEG: MCPTT Emergency Group


MEGC: MCPTT Emergency Group Call


MEI: Mobile Equipment Identity


MEID: Mobile Equipment IDentity


MEO: Medium Earth Orbiting


MEP: Multi-access Edge Platform


MEPC: MCPTT Emergency Private Call


MEPP: MCPTT Emergency Private Priority


MES: MCPTT Emergency State


MF: Media Function


MFAF: Messaging Framework Adaptor Function


MFBR: Maximum Flow Bit Rate


MFCN: Mobile / Fixed Communications Network


MG: Measurement Gap


MGCF: Media Gateway Control Function


MGF: Media Gateway Function


MGRP: Measurement Gap Repetition Period


MGV-F: MTK Generation and Validation Function


MGW: Media Gateway


MHAS: MPEG-H Audio Stream


MHI: Mobility History Information


MIB: Master Information Block


MIC: Message Integrity Check


MICO: Mobile Initiated Connection Only


MIG: MCPTT Imminent peril Group


MIGC: MCPTT Imminent peril Group Call


MIKEY: Multimedia Internet KEYing


MIME: Multipurpose Internet Mail Extensions


MIMO: Multiple Input Multiple Output


MINT: Minimization of Service Interruption


MIP: Mobile IP


MIPv4: Mobile IP version 4


MIPv6: Mobile IP version 6


MIoT: Mobile Internet of Things


MKFC: Multicast Key for Floor Control


MKFC-ID: Identifier of Multicast Key for Floor Control (MKFC-ID)


MKI: Master Key Identifier


ML: Machine Learning


MLC: Mobile Location Center


MLD: Multicast Listener Discovery


MM: Mobility Management or Multimedia Message


MME: Mobility Management Entity


MME NP: MME Network Product


MME NPC: MME Network Product Class


MMEC: MME Code


MME_SRVCC: MME Supporting 5G-SRVCC


MMI: Man Machine Interface


MMO: Massive Multiplayer Online


MMS: Multimedia Messaging Service


MMS R/S: Multimedia Messaging Relay / Server


MMSE: Minimum Mean Squared Error


MMSE-IRC: Minimum mean square error - interference rejection combining


MMSNA: Multimedia Messaging Service Network Architecture


MMSO: Multimedia Messaging Service Originator


MMSR: Multimedia Messaging Service Recipient


MMSS: MultiMode System Selection


MMT: MPEG Media Transport


MMTEL: MultiMedia Telephony


MMTel: MultiMedia Telephony


MN: Master Node


MNC: Mobile Network Code (part of IMSI)


MNO: Mobile Network Operator


MNPF: Mobile Number Portability Function


MNS:  Network Signalling


MO: Mobile Originated


MO SMS: Mobile Originated Short Message Service


MO-EDT: Mobile Originated Early Data Transmission


MO-LR: Mobile Originated Location Request


MO-SDT: Mobile Originated Small Data Transmission


MOAT: Mobile-Originated AS-Terminated


MOBA: Multiplayer Online Battle Arena


MOBIKE: IKEv2 Mobility and Multihoming Protocol


MOC: MO Call


MOCN: Multiple Operator Core Network


MODE: Indication packet switched / circuit switched mode


MOI: Managed Object Instance


MOMT: Mobile-Originated Mobile-Terminated


MONP: MCPTT Off-Network Protocol


MOP: Master Operator


MOP-NM: Master Operator Network Manager


MOP–SC-DM: Master Operator Shared CN DM


MOP–SR-DM: Master Operator Shared RAN DM


MOS: Mean Opinion Score


MOS-LQO: Mean Opinion Score – Listening Quality Objective


MOSPF: Multicast Open Shortest Path First


MP: Multi-path


MPAC: Multi-Probe Anechoic Chamber


MPC:  Positioning Centre


MPD: Media Presentation Description


MPDCCH: MTC Physical Downlink Control Channel


MPE: Maximum Permissible Exposure


MPEA: MCPTT Private Emergency Alert


MPEG: Moving Pictures Expert Group


MPQUIC: Multi-Path QUIC


MPR: Allowed maximum power reduction


MPS: Multimedia Priority Service


MPTCP: Multi-Path TCP Protocol


MR: Main Radio


MR-DC: Multi-Radio Dual Connectivity


MRB: MBS Radio Bearer


MRC: Maximum Ratio Combining


MRDC: Multi-Radio Dual Connectivity


MRF: Multimedia Resource Function


MRFC: Multimedia Resource Function Controller


MRFP: Multimedia Resource Function Processor


MRO: Mobility Robustness Optimisation


MRP: Market Representation Partner


MS: Mobile Station


MSA: MBMS Service Area


MSAS: Multi-functional Satellite Augmentation System


MSB: Most Significant Bit


MSC: Mobile Switching Centre


MSCCK: MBMS SubChannel Control Key


MSCCK-ID: MBMS SubChannel Control Key Identifier


MSCF: Messaging Service Control Function


MSD: Maximum Spectral Density


MSE: Media Service Enabler


MSGin5G: Message Service Within the 5G System


MSH: Media Session Handler


MSI: MCH Scheduling Information


MSISDN:  Station International Subscriber Directory Number


MSK: MBMS Service Key


MSMTSI: Multi-Stream Multimedia Telephony Service for IMS


MSP: MCH Scheduling Period


MSR: Multi-Standard Radio


MSRP: Message Session Relay Protocol


MSS: Mobile Satellite Services


MT: Mobile Terminal


MT SMS: Mobile Terminated Short Message Service


MT-EDT: Mobile Terminated Early Data Transmission


MT-LR: Mobile Terminated Location Request


MT-SDT: Mobile Terminated Small Data Transmission


MTC: Machine-Type Communications


MTC-IWF: Machine Type Communications-InterWorking Function


MTCH: Multicast Traffic Channel


MTHR: Medium-to-High Ratio


MTK: MBMS Traffic Key


MTLF: Model Training Logical Function


MTRP: Multiple Transmission and Reception Point


MTSI: Multimedia Telephony Service for IMS


MTU: Maximum Transfer Unit


MU: Measurement Uncertainty


MU-MIMO: Multi-user-Multiple Input Multiple Output


MUA: Modify UE context Answer


MUK: MBMS User Key


MUR: Modify UE context Request


MUSIM: Multi-Universal Subscriber Identity Module


MUST: Multiuser Superposition Transmission


MVEA: MCVideo Emergency Alert


MVEG: MCVideo Emergency Group


MVEGC: MCVideo Emergency Group Call


MVEPC: MCVideo Emergency Private Call


MVEPP: MCVideo Emergency Private Priority


MVES: MCVideo Emergency State


MVIG: MCVideo Imminent peril Group


MVIGC: MCVideo Imminent peril Group Call


MVNO: Mobile Virtual Network Operator


MVPEA: MCVideo Private Emergency Alert


MWD: Message Waiting Data


MWI: Message Waiting Indication


Max: Maximum


Mbps: Mega bit per second


MeNB: Master eNB


MexE:  Execution Environment


MgNB: Master gNB


MiD: Multi-iDentity


MiFID II: Markets in Financial Instruments Directive II


MiFIR: Markets in Financial Instruments Regulation


MnF: Management Function


MnS: Management Service


MoU: Memorandum of Understanding (GSM operator joint)


MuD: Multi-Device


MuSiK: Multicast Signalling Key


MuSiK-ID: Multicast Signalling Key Identifier


Multi-RTT: Multi-Round Trip Time


N-MOS-LQOfb: Noise (Background) - Mean Opinion Score Listening Quality Objective - Fullband


N-MOS-LQOn: Noise (Background) - Mean Opinion Score Listening Quality Objective - Narrowband


N-MOS-LQOw: Noise (Background) - Mean Opinion Score Listening Quality Objective - Wideband


N-PDU: Network-Protocol Data Unit


N-RTK: Network – Real-Time Kinematic


N-TM: NB-IoT Test Model


N/A: Not Applicable


N/PMOS: N/P-channel Metal-Oxide Semiconductor


N2: Reference point between the NG-RAN and the AMF


N3A: Non-3GPP Access


N3AEC: Non-3GPP Access Establishment Cause


N3AF: Non-3GPP Access Function


N3AN: Non-3GPP Access Network


N3C: Non-3GPP Connection


N3G: Non-3GPP Access


N3IWF: Non-3GPP InterWorking Function


N3QAI: Non-3GPP QoS Assistance Information


N5CW: Non-5G-Capable over WLAN


N5GC: Non-5G Capable


N9HR: N9 Home Routed


NA: Naming Authority


NA(P)T-PT: Network Address (Port-Multiplexing) Translation-Protocol Translation


NAAS: Network As A Service


NACC: Network Assisted Cell Change


NACK: Negative Acknowledgement


NAF: Network Application Function


NAI: Network Access Identifier


NAICS: Network-Assisted Interference Cancellation and Suppression


NAL: Network Abstraction Layer


NAP: Network Access Provider


NAPT: Network Address Port Translation


NAPTR: Naming Authority Pointer


NAS: Non-Access Stratum


NASS: Network Attachment Subsystem


NAT: Network Address Translation


NAV: Navigation


NB: Narrowband


NB-IoT: Narrow Band Internet of Things


NBIFOM: Network-based IP flow mobility


NBM: Network-based Mobility


NBMP: Network-Based Media Processing


NC: Non Contiguous


NCC: Next Hop Chaining Counter


NCD-SSB: Non Cell Defining SSB


NCGI: NR Cell Global Identifier


NCI: NR Cell Identity


NCIS: Network Controlled Interactive Service


NCJT: Non-Coherent Joint Transmission


NCL: Neighbour Cell List


NCR: Network-Controlled Repeater


NCR-Fwd: NCR Forwarding


NCR-MT: Network controlled repeater – Mobile Termination


NCRT: Neighbour Cell Relation Table


NCSG: Network Controlled Small Gap


ND: No Display capability


NDI: New Data Indicator


NDPP: Network Device Protection Profile


NDS: Network Domain Security


NDS/IP: NDS for IP based protocols


NE: Network Element


NE-DC: NR E-UTRA Dual Connectivity with MCG using NR and SCG using E-UTRA


NEA: Encryption Algorithm for 5G


NEAF: Non-EPS Alert Flag


NEF: Network Exposure Function


NES: Network Energy Savings


NESAG: Network Equipment Security Assurance Group


NEST: Network Slice Template


NEV: NEVer


NF: Network Function


NFTF: Near Field to Far-field


NFV: Network Functions Virtualization


NFV-MANO: Network Functions Virtualisation Management and Orchestration


NFVI: Network Function Virtualisation Infrastructure


NFVO: Network Functions Virtualization Orchestrator


NFc: NF service consumer


NFp: NF service producer


NG: Next Generation


NG-AP: Next Generation Application Protocol


NG-C: Next Generation Control plane


NG-RAN: Next Generation Radio Access Network


NG-U: Next Generation User plane interface


NGAP: Next Generation Application Protocol


NGC: Next Generation Core


NGCOR: Next Generation Converged Operations Requirements


NGEN-DC: E-UTRA NR Dual Connectivity with E-UTRA connected to 5GC


NGEO: Non-Geostationary Earth Orbiting


NGN: Next Generation Network


NGSI: Next Generation Service Interfaces


NGSO: Non-Geostationary-Satellite Orbit


NH: Next Hop key


NI-LR: Network Induced Location Request


NIA: Integrity Algorithm for 5G


NICT: National Institute of Information and Communications Technology


NID: Network Identifier


NIDD: Non-IP Data Delivery


NITZ: Network Identity and Time Zone


NK: No Keypad capability


NL: No support of multiple Languages


NLOS: Non-Line-of-Sight


NLSP: Network local switch for PIN


NLoS: Non-Line of Sight


NM: Network Manager


NMS: National Market Systems


NMSE: Normalized Mean Square Error


NNI: Network to Network Interface


NNSF: NAS Node Selection Function


NOM: Nominal volume setting


NOP: Network Operator


NP: Network Parameter


NPBCH: Narrowband Physical Broadcast channel


NPC: Network Product Class


NPCD: Network Product Class Description


NPDCCH: Narrowband Physical Downlink Control channel


NPDSCH: Narrowband Physical Downlink Shared channel


NPI: Numbering Plan Identifier


NPLI: Network Provided Location Information


NPN: Non-Public Network


NPN-OP: NPN Operator


NPN-SC: NPN Service Customer


NPN-SP: NPN Service Provider


NPRACH: Narrowband Physical Random Access channel


NPRS: Narrowband Positioning Reference Signals


NPSS: Narrowband Primary Synchronization Signal


NPUSCH: Narrowband Physical Uplink Shared channel


NR: New Radio (the radio interface of 5G)


NR-ARFCN: New Radio Absolute Radio Frequency Channel Number


NR-DC: NR-NR Dual Connectivity


NR-MIB: New Radio-Master Information Block


NR-U: New Radio Unlicensed


NR/5GC: NR connected to 5GC


NRA: Non-Aggregated RUCI Report Answer


NRAO: National Radio Astronomy Observatory


NRF: Network Repository Function


NRID: Networked Remote Identification


NRM: Network Resource Management


NRPEK: NR PC5 Encryption Key


NRPIK: NR PC5 Integrity Key


NRPPa: NR Positioning Protocol Annex


NRR: Non-Aggregated RUCI Report Request


NRS: Narrowband Reference Signal


NRSRP: Narrowband Reference Signal Received Power


NRSRQ: Narrowband Reference Signal Received Quality


NRT: Neighbour Relation Table


NRTC: NR Test Configuration


NS: Network Service


NS-AoS: Network Slice Area of Service


NSA: Non-Standalone, a mode of operation where operation of a radio is assisted with another radio


NSAC: Network Slice Admission Control


NSACF: Network Slice Admission Control Function


NSAG: Network Slice AS Group


NSC: Network Slice Customer


NSCE: Network Slice Capability Enablement


NSCI: New Security Context Indicator


NSCOF: Network Slice Certificate Orchestration Function


NSF: National Science Foundation


NSI: Network Specific Identifier


NSI ID: Network Slice Instance Identifier


NSLPI: NAS Signalling Low Priority Indication


NSM: Network Slice Management


NSMF: Network Slice Management Function


NSP: Network Service Provider


NSPA: Network Slice Performance and Analytics


NSS: Network Slice Specific


NSSAA: Network Slice-Specific Authentication and Authorization


NSSAAF: Network Slice-Specific Authentication and Authorization Function


NSSAI: Network Slice Selection Assistance Information


NSSF: Network Slice Selection Function


NSSI: Network Slice Subnet Instance


NSSP: Network Slice Selection Policy


NSSRG: Network Slice Simultaneous Registration Group


NSSS: Narrowband Secondary Synchronization Signal


NSWO: Non-Seamless WLAN Offload


NSWOF: Non-Seamless WLAN offload Function


NSaaS: Network Slice as a Service


NSaaSP: Network Slice as a Service Provider


NSaasC: Network Slice as a Service Customer


NTC: Test Configuration for Non-contiguous operation


NTN: Non-Terrestrial Networks


NTP: Network Time Protocol


NTP-UTC: Network Time Protocol – Coordinated Universal Time


NTSC: National Time Service Center of Chinese Academy of Sciences


NUL: Normal Uplink


NW: Network


NW-TT: Network-side TSN translator


NWDAF: Network Data Analytics Function


NZP: Non-zero-power


NZP CSI-RS: Non-Zero Power CSI-RS


NaaS: Network-as-a-Service


NavIC: NAVigation with Indian Constellation


NetLoc: Network provided Location information


O&M: Operation and Maintenance


O2I: Outdoor-to-Indoor


O2O: Outdoor-to-Outdoor


OA: Outgoing Access


OA&M: Operation, Administration and Maintenance


OAM: Operation Administration and Maintenance


OAM&P: Operations, Administration, Maintenance and Provisioning


OATP: On-board Automatic Train Protection


OATS: Open Area Test Site


OBA: Object Based Audio


OBUE: Operating Band Unwanted Emissions


OBW: Occupied Band Width


OCB: Outgoing Communication Barring


OCC: Orthogonal Covering Code


OCF: Online Charging Function


OCI: Outgoing Call Information


OCNG: OFDMA Channel Noise Generator


OCS: Online Charging System


OCSP: Online Certificate Status Protocol


OCST: Operator Contolled Signal Threshold per Access Technology


OCT: Outgoing Call Timer


ODB: Operator Determined Barring


OFCS: Offline Charging System


OFDM: Orthogonal Frequency Division Multiplexing


OFDMA: Orthogonal Frequency Division Multiple Access


OHMD: Optical Head Mount Display


OIDC: OpenID Connect


OIP: Originating Identification Presentation


OIR: Originating Identification Restriction


OLC: OverLoad Control


OLC-H: Overload Control based on OCI Header


OLI: Originating Line Information


OLPC: Open Loop Power Control


OLR: Overall Loudness Rating


OMA: Open Mobile Alliance


OMAF: Omnidirectional Media Application Format


OMC-ID: Operation and Maintenance Centre Identity


OMG: Object Management Group


OMR: Optimal Media Routing


ON-SNPN: Onboarding Standalone Non-Public Network


ONN: Onboarding Network


OOB: Out-of-band


OOBE: Out-of-band Emissions


OOC: Out Of Coverage


OOK: On-off keying


OP: Operator Platform


OPEX: Operating Expenses


OPG: Operator Platform Group


OPI: Offload Preference Indicator


OS: OFDM Symbol


OS Id: OS Identity


OSA: Open Services Architecture


OSCORE: Object Security for Constrained RESTful Environments


OSDD: OTA Sensitivity Directions Declaration


OSId: Operating System Identity


OSPP: Operating System Protection Profile


OSR: Observation Space Representation


OSS: Operations Support System


OT: Operation Technology


OTA: Over The Air


OTAK: Over-The-Air-Key Management (TETRA)


OTAR: Over-The-Air Rekeying (P25)


OTDOA: Observed Time Difference Of Arrival (positioning method)


OTT: Over-The-Top


OVSF: Orthogonal variable spreading factor


OWSER: OMA Web Services


OpenGL: Open Graphics Library


Out: Outgoing


P-CCPCH: Primary Physical Common Control CHannel


P-CSCF: Proxy - Call Session Control Function


P-CSI: Periodic CSI


P-GRUU: Public Globally Routable User Agent URI


P-GW: PDN GateWay


P-MPR: Power Management Maximum Power Reduction


P-NEST: Private NEST


P-RNTI: Paging RNTI


P-UE: Pedestrian UE


P25: Project 25


P2A: Person to Application


P2N: PINE-to-Network


P2P: Person to Person


P2X: Pedestrian-to-Everything


PA: Paging Area


PAA: PDN Address Allocation


PAE: Power Added Efficiency


PAG: POI Aggregator


PAKE: Password-based key establishment


PAP: Password Authentication Protocol


PAPR: Peak-to-Average Power Ratio


PAS: Power Angular Spectrum


PASSporT: Personal Assertion Token


PAnF: Prose Anchor Function


PB: Power Boosting


PBCH: Physical Broadcast CHannel


PBID: Phonebook Identifier


PBPS: Periodic-based partial sensing


PBR: Prioritised Bit Rate


PBU: Proxy Binding Update


PBW: Percentage Bandwidth


PC: Personal Computer


PC5 LINK-AMBR: PC5 Link Aggregated Bit Rate


PCC: Policy Control and Charging


PCCA: Portable Computer and Communications Association


PCCB: Private Call Call-Back


PCCH: Paging Control Channel


PCCPCH: Primary Common Control Physical Channel


PCEF: Policy and Charging Enforcement Function


PCF: Policy and Charging Function


PCFICH: Physical Control Format Indicator CHannel


PCH: Paging Channel


PCI: Physical Cell Identifier


PCK: Private Call Key


PCK-ID: Private Call Key Identifier


PCM: Pulse Code Modulation


PCN: Packet switched Core network Node (SGSN, S–GW, P–GW, TDF)


PCO: Protocol Configuration Options


PCP: Priority Code Point


PCRF: Policy and Charging Rules Function


PCV: Phase Center Variation


PCell: Primary Cell


PD: Protocol Discriminator


PDA: Personal Digital Assistant


PDB: Packet Delay Budget


PDC: Propagation Delay Compensation


PDCCH: Physical Downlink Control CHannel


PDCP: Packet Data Convergence Protocol


PDF: Policy Decision Function


PDG: Packet Data Gateway


PDI: Packet Detection Information


PDN: Packet Data Network or Public Data Network


PDN GW: Packet Data Network Gateway


PDP: Packet Data Protocol


PDR: Packet Detection Rule


PDS: Packet Data Subsystem


PDSCH: Physical Downlink Shared CHannel


PDTQ: Planned Data Transfer with QoS requirements


PDU: Protocol Data Unit


PDUID: ProSe Discovery UE ID


PDV: Packet Delay Variation


PEC: Post Event Charging


PEE: Power, Energy and Environmental


PEGC: PIN Element with Gateway Capability


PEI: Paging Early Indication


PEI-O: Paging Early Indication-Occasion


PEI-RNTI: Paging Early Indication RNTI


PEIPS: Paging Early Indication with Paging Subgrouping


PEM: Privacy-Enhanced Mail


PEMC: PIN Element with Management Capability


PER: Packet Error Rate


PESQ: Perceptual Evaluation of Speech Quality


PF: Paging Frame


PFCP: Packet Forwarding Control Protocol


PFD: Packet Flow Description


PFDF: Packet Flow Description Function


PFI: PC5 QoS Flow Identifier


PFL: Positioning Frequency Layer


PG: PLMN Generic


PGK: ProSe Group Key


PGW: PDN Gateway, the abbreviation of PDN GW


PGW-C: PDN Gateway Control plane function


PGW-U: PDN Gateway User plane function


PH: Paging Hyperframes


PHB: Per-Hop Behaviour


PHICH: Physical Hybrid ARQ Indicator CHannel


PHP: Hypertext Preprocessor


PHR: Power Headroom Reporting


PHS: Personal Handyphone System


PHY: Physical layer


PI: Performance Indicator


PICS: Protocol Implementation Conformance Statement


PIDF: Presence Information Data Format


PIDF-LO: Presence Information Data Format Location Object


PIM: Protocol-Independent Multicast


PIM-DM: Protocol-Independent Multicast- Dense Mode


PIM-SM: Protocol Independent Multicast – Sparse Mode


PINAPP: Personal IoT Network Application


PINE: PIN Element


PIXIT: Protocol Implementation extra Information for Testing


PKCE: Proof Key for Code Exchange


PKCS: Public-Key Cryptography Standards


PKI: Public Key Infrastructure


PKMF: ProSe Key Management Function


PL: Priority Level


PLC: Programmable Logic Controller


PLI: Picture Loss Indication


PLL: Phase Locked Loop


PLMN: Public Land Mobile Network


PLR: Packet Loss Rate


PLY: PoLYgon file format


PM: Performance Management


PMCH: Physical Multicast CHannel


PMD: Pseudonym mediation device functionality


PMF: Performance Measurement Function


PMI: Precoding Matrix Index


PMIC: Port Management Information Container


PMIP: Proxy Mobile IP


PMIP/PMIPv6: Proxy Mobile IP version 6


PMK: Pairwise Master Key


PMS: Port management service


PMU: Phasor Measurement Unit


PN: Personal Network


PNA: Presence Network Agent


PNE: Personal Network Element


PNF: Physical Network function


PNG: Portable Network Graphics


PNI-NPN: Public Network Integrated Non-Public Network


PNM: Personal Network Management


PO: Participating Operator


POI: Point Of Interception


POLQA: Perceptual Objective Listening Quality Assessment


PON: Passive Optical Network


POP: Participating Operator


POP-CORE-DM: Participating Operator CN DM


POP-NM: Participating Operator Network Manager


POP-RAN-DM: Participating Operator RAN DM


PP: Protection Profile


PPD: Paging Policy Differentiation


PPF: Paging Proceed Flag


PPI: Paging Policy Indicator


PPP: Paging Policy Presence


PPP-RTK: Precise Point Positioning – Real-Time Kinematic


PPPP: ProSe Per-Packet Priority


PPPR: ProSe Per-Packet Reliability


PPS: Picture Parameter Set


PPW: PRS Processing Window


PQFI: PC5 QoS Flow ID


PQI: PC5 5QI


PRA: Presence Reporting Area


PRACH: Physical Random Access CHannel


PRACK: Provisional Response Acknowledgement


PRAS: Premises Radio Access Station


PRB: Physical Resource Block


PRC: Pseudo-Range Correction


PRES: Presence


PRG: Physical Resource block Group


PRINS: PRotocol for N32 INterconnect Security


PRS: Positioning Reference Signal


PRU: Position Reference Unit


PRUK: ProSe Relay User Key


PS: Packet-Switched


PS-RNTI: Power Saving RNTI


PSA: PDU Session Anchor


PSAP: Public Safety Access Point


PSBCH: Physical Sidelink Broadcast CHannel


PSC: Packet Scheduling


PSCCH: Physical Sidelink Control CHannel


PSCell: Primary SCG (Secondary Cell Group) Cell


PSD: Power Spectral Density


PSDB: PDU Set Delay Budget


PSDCH: Physical Sidelink Discovery CHannel


PSDK: Public Safety Discovery Key


PSER: PDU Set Error Rate


PSFCH: Physical Sidelink Feedback Channel


PSI: PDU Set Importance


PSID: Provider Service Identifier


PSIHI: PDU Set Integrated Handling Information


PSK: Pre-Shared Key


PSM: Power Saving Mode


PSN: PDU Sequence Number within a PDU Set


PSNR: Peak Signal to Noise Ratio


PSP: PAS Similarity Percentage


PSPDN: Packet-Switched Public Data Network


PSPL: Preferred Service Provider List


PSS: Primary Synchronization Signal


PSSCH: Physical Sidelink Shared Channel


PSSN: PDU Set Sequence Number


PSSS, S-PSS: Primary sidelink synchronization signal (LTE), sidelink primary synchronization signal (NR)


PSSize: PDU Set Size


PSTN: Public Switched Telephone Network


PS_DO: PIN Status Data Object


PT-RS: Phase-tracking reference signal


PTAG: Primary Timing Advance Group


PTC: Push to Talk over Cellular


PTI: Precoding Type Indicator


PTK: ProSe Traffic Key


PTM: Point to Multipoint


PTP: Point to Point


PTRS: Phase-Tracking Reference Signal


PTT: Push-To-Talk


PTW: Paging Transmission Window


PTZF: Pan, Tilt, Zoom and Focus


PUA: Presence User Agent


PUCCH: Physical Uplink Control CHannel


PUCCH-SCell: PUCCH SCell


PUCCH-sSCell: PUCCH switching SCell


PUR: Preconfigured Uplink Resource


PUR-RNTI: Preconfigured Uplink Resource RNTI


PUSCH: Physical Uplink Shared Channel


PVRTC: PowerVR Texture Compression


PVS: Provisioning Server


PVT: Public Validation Token


PWS: Public Warning System


PZ-90: Parametry Zemli 1990 Goda – Parameters of the Earth Year 1990


PoC: Push-to-talk over Cellular


ProSe: Proximity Services


ProSeP: 5G ProSe Policy


PtP: Point-to-Point


QAM: Quadrature Amplitude Modulation


QBC: QoS flow Based Charging


QCI: Quality of Service Class Indicator


QCL: Quasi Co-Location


QER: QoS Enforcement Rule


QFI: QoS Flow Indicator


QLOG: QUIC Logging


QMC: QoE Measurement Collection


QMS: Quality Management System


QNC: QoS Notification Control


QP: Quantization Parameter


QPSK: Quadrature Phase Shift Keying


QRI: QoS Rule Identifier


QUIC: Quick UDP Internet Connections


QZ: Quiet Zone


QZS: Quasi Zenith Satellite


QZSS: Quasi-Zenith Satellite System


QZST: Quasi-Zenith System Time


QoE: Quality of Experience


QoS: Quality of Service


R-ML: Reduced complexity Maximum likelihood


R-PDCCH: Relay Physical Downlink Control CHannel


RA: Random Access


RA-RNTI: Random Access RNTI


RA-SDT: Random Access-based SDT


RAB: Radio Access Bearer


RAC: Radio Admission Control


RACH: Random Access Channel


RACS: Radio Capabilities Signalling optimisation


RADIUS: Remote Authentication Dial In User Service


RAI: Release Assistance Indication


RAM: Random Access Memory


RAN: Radio Access Network


RANAC: RAN-based Notification Area code


RANAP: Radio Access Network Application Part


RAND: Random challenge


RANDMS: Random challenge stored in the USIM


RAP: Random Access Point


RAR: Random Access Response


RAS: Radio Astronomy Service


RAT: Radio Access Technology


RB: Resource Block


RBAC: Role Based Access Control


RBC: Radio Bearer Control


RBG: Resource Block Group


RCAF: RAN Congestion Awareness Function


RCD: Rich Call Data


RCEF: RRC Connection Establishment Failure


RCLWI: RAN Controlled LTE-WLAN Interworking


RCP: Remote Copy Program


RCS: Return Channel via Satellite


RCSA: Radiated Capability Set supported by the AAS BS


RCST: Return Channel via Satellite Terminal


RDF: Routing Determination Function


RDI: Restricted Digital Information


RDN: Radio Distribution Network


RDP: Remote Delete Program


RDS: Reliable Data Service


RE: Resource Element


RE-NWDAF: Roaming Exchange NWDAF


REC: Railway Emergency Communication


REFSENS: Reference Sensitivity power level


REG: Resource Element Group


REL: Release


RES: User response


REST: REpresentational State Transfer


RET: Remote Electrical Tilting


RF: Radio Frequency


RFC: Request For Comments


RFFT: Real FFT


RFID: Radio-frequency identification


RFR: Receive Frequency Response


RFSP: RAT Frequency Selection Priority


RFSS: Radio Frequency Subsystem


RFU: Reserved for Future Use


RG: Residential Gateway


RG-LWAC: RG Level Wireline Access Characteristics


RGB: Red-Green-Blue colour space


RGBA: Red-Green-Blue-Alpha


RGBD: Red-Green-Blue-Depth


RI: Rank Indication


RIB: Radiated Interface Boundary


RIBS: Radio-interface based synchronization


RID: Remote Identification


RIM: Remote Interference Management


RIM-RS: Remote Interference Management Reference Signal


RIV: Resource Indicator Value


RLC: Radio Link Control


RLF: Radio Link Failure


RLM: Radio Link Monitoring


RLM-RS: Reference Signal for RLM


RLMI: Resource List Meta-Information


RLOS: Restricted Local Operator Services


RLP: Radio Link Protocol


RLR: Receive Loudness Rating


RLS: Resource List Server


RMC: Reference Measurement Channel


RMS: Root Mean Square (value)


RMSI: Remaining Minimum SI


RMTC: RSSI Measurement Timing Configuration


RMa: Rural Macro


RN: Relay Node


RNA: RAN-based Notification Area


RNAA: Resource owner-aware Northbound API Access


RNAU: RAN-based Notification Area Update


RNC: Radio Network Controller


RNIS: Radio Network Information Service


RNL: Radio Network Layer


RNN: Recurrent Neural Network


RNS: Radio Network Subsystem


RNTI: Radio Network Temporary Identifier


RO: RACH Occasion


ROHC: Robust Header Compression


ROI: Region of Interest


ROM: Receive Only Mode


RP: Reference point


RP-MTI: RP Message Type Indicator


RP-SMEA: RP SME-Address


RP-UI: RP User Information


RPAUID: Restricted ProSe Application User ID


RPC: Remote Procedure Call


RPG: Role Playing Game


RPH: Reverse Path Filter


RPID: Rich Presence Information Data


RPLMN: Registered Public Land Mobile Network


RPOA: Recognized Private Operating Agency


RPSNR: Recovered PSNR


RQA: Reflective QoS Attribute


RQI: Reflective QoS Indication


RQoS: Reflective Quality of Service


RR: Receiver Report


RRC: Radio Resource Control


RRH: Remote Radio Head


RRM: Radio Resource Management


RRP: MIPv4 Registration Reply


RRQ: MIPv4 Registration Request


RS: Reference Signal


RS-EPRE: Reference Signal-Energy Per Resource Element


RSC: Relay Service Code


RSCP: Received Signal Code Power


RSCPD: Reference Signal Carrier Phase Difference


RSD: Rule Selection Descriptor


RSH: Remote shell


RSI: Radio Set Identity


RSLPP: Ranging and sidelink positioning policy


RSM: Reference Site Method


RSN: Redundancy Session Number


RSNPN: Registered SNPN


RSPP: Ranging / SL Positioning Protocol


RSRP: Reference Signal Received Power


RSRPP: Reference Signal Received Path Power


RSRQ: Reference Signal Received Quality


RSS: Resynchronisation signal


RSSI: Received Signal Strength Indicator


RST: Reset


RSTD: Reference Signal Time Difference


RSTP: Rapid Spanning Tree Protocol


RSU: Roadside unit


RTC: Real-Time Communication


RTCP: Real-time Transport Control Protocol


RTK: Real-Time Kinematic


RTP: Real-time Transport Protocol


RTS: Real-Time Strategy


RTS 25: Regulatory Technical Standard 25


RTT: Round Trip Time


RTTI: Real-time Transfer of Tariff Information


RTU: Remote Terminal Unit


RTWP: Received Total Wideband Power


RU: Radio Unit


RUCI: RAN User Plane Congestion Information


RV: Redundancy Version


RVQoE: RAN visible QoE


RWP: Region-Wise Packing


RX: Receiver


RedCap: Reduced Capability


Rel: 3GPP Release


Remote ID: Remote Identification


RoAoA: Range of Angles of Arrival


RoHC: Robust HeaderCompression


RoT: Root of Trust


Rx: Receiver


S-CORE: Shared CN


S-CPAC: Subsequent CPAC


S-CSCF: Server-Call Session Control Function


S-EAS: Source Edge Application Server


S-EES: Source Edge Enabler Server


S-GW: Serving Gateway


S-MOS-LQOfb: Speech Signal Quality - Mean Opinion Score - Listening Quality Objective - Fullband


S-MOS-LQOn: Speech Signal Quality - Mean Opinion Score - Listening Quality Objective - Narrowband


S-MOS-LQOw: Speech Signal Quality - Mean Opinion Score - Listening Quality Objective - Wideband


S-NEST: Standardized NEST


S-NG-RAN node: Secondary NG-RAN node


S-NSSAI: Single Network Slice Selection Assistance Information


S-RAN: Shared RAN


S-RSRP: Sidelink Reference Signal Received Power


S-RSSI: Sidelink received signal strength indicator


S-SSB: Sidelink synchronization signal block


S-TMSI: S-Temporary Mobile Subscriber Identity


S1-MME: S1 for the control plane


S1-U: S1 for the user plane


S101-AP: S101 Application Protocol


S1AP: S1 Application Protocol


S8HR: S8 Home Routed


SA: Standalone


SA NR: Standalone New Radio


SA PDU: Single-Access PDU


SAC: Service Area Code


SACH: Service Announcement Channel


SAE: System Architecture Evolution


SAF: Service Announcement Function


SAI: Service Area Identifier


SAKKE: Sakai-Kasahara Key Encryption


SAP: Service Access Point


SARI: Service Area Restriction Information


SB-ADPCM: Sub-Band Adaptive Differential PCM


SBA: Service Based Architecture


SBAS: Satellite Based Augmentation System


SBCCH: Sidelink Broadcast Control Channel


SBCF: Session Based Charging Function


SBFD: Subband non-overlapping Full Duplex


SBI: Service Based Interfaces


SBI-NR: Southbound Interface-Network Resources


SBMA: Service Based Management Architecture


SBR: Spectral Band Replication


SBT: Single Band Testing


SC: Service Continuity


SC-FDM: Single-Carrier Frequency Division Multiplexing


SC-FDMA: Single Carrier – Frequency Division Multiple Access


SC-MCCH: Single Cell Multicast Control Channel


SC-MRB: Single Cell MRB


SC-MTCH: Single Cell Multicast Transport Channel


SC-N-RNTI: Single Cell Notification RNTI


SC-PTM: Single Cell Point To Multipoint


SC-RNTI: Single Cell RNTI


SC-VBR: Source Controlled VBR


SCADA: Supervisory Control And Data Acquisition


SCAS: Security Assurance Specification


SCBW: Smaller Channel Bandwidth (Existing immediate lower channel bandwidth)


SCC: Secondary Component Carrier


SCCF: Subscriber Content Charging Function


SCCH: Sidelink Control Channel


SCCP: Signalling Connection Control Part


SCEF: Service Capability Exposure Function


SCG: Secondary Cell Group


SCGF: Second Cell Group Failure


SCH: Shared Channel


SCI: Sidelink Control Information


SCM: Single-connection mode


SCM-C: SEAL Configuration Management Client


SCM-S: SEAL Configuration Management Server


SCP: Service Communication Proxy


SCS: Sub-Carrier Spacing


SCT: Security Compliance Testing


SCTP: Stream Control Transmission Protocol


SCUDIF: Service Change and UDI / RDI Fallback


SCUR: Session Charging with Unit Reservation


SCell: Secondary Cell


SD: Standard Definition


SD-RSRP: Sidelink Discovery Reference Signal Received Power


SDAP: Service Data Adaptation Protocol


SDES: Session Description Protocol Security Descriptions for Media Streams


SDF: Service Data Flow


SDK: Software Development Kit


SDL: Supplementary Downlink


SDMA: Spatial Division Multiple Access


SDN: Service dialling number


SDNAEPC: Secondary DN authentication and authorization over EPC


SDO: Standalone Downlink Only


SDP: Session Description Protocol


SDPCapNeg: SDP Capability Negotiation


SDR: Standard Dynamic Range


SDS: Short Data Service


SDT: Small Data Transmission


SDU: Service Data Unit


SE: Security Environment


SEAF: Security Anchor Functionality


SEAL: Service Enablement Application Layer


SEAL-UU: Service Enabler Architecture Layer for Verticals, Universal UE-network interface


SEALDD: Service Enabler Architecture Layer – Data Delivery


SECAM: Security Assurance Methodology


SEES: Service Exposure and Enablement S


SEG: Security Gateway


SEI: Supplemental Enhancement Information


SEID: Session Endpoint Identifier


SEM: Spectrum emission mask


SENSE: Signal level Enhanced Network Selection


SEPP: Security Edge Protection Proxy


SEQp: Sequence number for MGV-F stored in the USIM


SET: SUPL Enabled Terminal


SF: Service Function


SFC: Service Function Chaining


SFCI: Sidelink Feedback Control Information


SFD: Start Frame Delimiter


SFI: Short EF Identifier


SFI-RNTI: Slot Format Indication RNTI


SFN: System Frame Number


SFR: Security Functional Requirement


SFTD: SFN and Frame Timing Difference


SFTP: Secure File Transfer Protocol


SFU: Selective Forwarding Unit


SGC: Service Gap Control


SGCS: Squared Generalized Cosine Similarity


SGH: Standard Gain Horn


SGID: Special Group Identification


SGM-C: SEAL Group Management Client


SGM-S: SEAL Group Management Server


SGSN: Serving GPRS Support Node


SGW: Serving Gateway


SGW-C: Serving Gateway Control plane function


SGW-U: Serving Gateway User plane function


SGsAP: SGs Application Part


SHA: Secure Hash Algorithm


SHAKEN: Signature-based Handling of Asserted information using toKENs


SHR: Successful Handover Report


SI: System Information


SI-RNTI: System Information RNTI


SIB: System Information Block


SIB1: System Information Block 1


SIB10: System Information Block 10


SIB12: System Information Block 12


SIB13: System Information Block 13


SIB14: System Information Block 14


SIB15: System Information Block 15


SIB17: System Information Block 17


SIB18: System Information Block 18


SIBX: SystemInformationBlockTypeX


SID: SIlence Descriptor


SIDF: Subscription Identifier De-concealing Function


SIFT: Scale Invariant Feature Transform


SIM: Subscriber Identity Module


SIM-C: SEAL Identity Management Client


SIM-S: SEAL Identity Management Server


SINR: Signal-to-Interference-and-Noise Ratio


SIP: Session Initiated Protocol


SIPTO: Selected IP Traffic Offload


SIPTO@LN: Selected IP Traffic Offload at the Local Network


SIR: Signal to Interference Ratio


SIRF: System Information Retrieval Function


SKM-C: SEAL-Key Management Client


SKM-S: SEAL Key Management Server


SL: Sidelink


SL PRS: Sidelink Positioning Reference Signal


SL-AoA: Sidelink Angle-of-Arrival


SL-BCH: Sidelink Broadcast Channel


SL-CS-RNTI: Sidelink Configured Scheduling RNTI


SL-DCH: Sidelink Discovery Channel


SL-MIMO: Sidelink-Multiple Antenna Transmission


SL-MO-LR: Sidelink Mobile Originating Location Request


SL-MT-LR: Sidelink Mobile Terminating Location Request


SL-PRS: Sidelink Positioning Reference Signals


SL-PRS-CS-RNTI: SL-PRS Configured Scheduling RNTI


SL-PRS-RNTI: SL-PRS RNTI


SL-PRS-RSRP: Sidelink Positioning Reference Signals based Reference Signal Received Power


SL-PRS-RSRPP: Sidelink Positioning Reference Signals based Reference Signal Received Path Power


SL-PRS-RSTD: Sidelink Positioning Reference Signals based Reference Signal Time Difference


SL-PRS-RTOA: Sidelink Positioning Reference Signals based Relative Time of Arrival


SL-RNTI: Sidelink RNTI


SL-RSRP: Sidelink RSRP


SL-RSTD: Sidelink Reference Signal Time Difference


SL-RTOA: Sidelink Relative Time of Arrival


SL-RTT: Sidelink Round Trip Time


SL-SCH: Sidelink Shared Channel


SL-TDOA: Sidelink Time Difference Of Arrival


SL-TOA: Sidelink Time Of Arrival


SL-U: Sidelink at unlicensed band


SL-V-RNTI: Sidelink V2X RNTI


SLA: Service Level Agreement


SLAM: Simultaneous Localization And Mapping


SLF: Subscriber Locator Function


SLIV: Start and Length Indicator Value


SLM-C: SEAL Location Management Client


SLM-S: SEAL Location Management Server


SLMP: SEAL Off-network Location Management Protocol


SLP: SUPL Location Platform


SLPEK: Sidelink Positioning Encryption Key


SLPGK: Sidelink Positioning Group Key


SLPIK: Sidelink Positioning Integrity Key


SLPK: SideLink Positioning Key


SLPKMF: SideLink Positioning Key Management Function


SLPP: Sidelink Positioning Protocol


SLPTK: Sidelink Positioning Traffic Key


SLR: Send Loudness Rating


SLRB: Sidelink Radio Bearer carrying NR sidelink communication or NR sidelink discovery


SLS: Service Level Specification


SLSS: Sidelink synchronization signal


SM: Session Management


SM MO: Short Message Mobile Originated


SM MT: Short Message Mobile Terminated


SM RL: Short Message Relay Layer


SMC: Security Mode Command


SMCC: Session Management Congestion Control


SMCCE: Session Management Congestion Control Experience


SMDS: Switched Multimegabit Data Service


SME: Short Message Entities


SMF: Session Management Function


SMNO: Satellite Mobile network Operator


SMP: SBI Message Priority


SMS: Short Message Service


SMS-GMSC: Gateway MSC for SMS


SMS-IWMSC: Interworking MSC for SMS


SMS-SC: Short Message Service-Service Centre


SMSC: Short Message Service Center


SMSF: Short Message Service Function


SMSMI: SMS without MSISDN in IMS


SMSoNAS: SMS over NAS


SMTC: SSB-based Measurement Timing configuration


SN Id: Serving Network Identifier


SN3D: Schmidt semi-normalisation


SNM-C: SEAL Notification Management Client


SNMP: Stand-Alone Non-Public Network


SNN: Serving Network Name


SNPN: Stand-alone Non-Public Network


SNPN ID: Stand-alone Non-Public Network Identity


SNR: Signal-to-Noise Ratio


SNRM-C: SEAL Network Resource Management Client


SNRM-S: SEAL Network Resource Management Server


SNSCE-C: SEAL Network Slice Capability Enablement Client


SNSCE-S: SEAL Network Slice Capability EnablementServer


SNTP: Simple Network Time Protocol


SO: Security Objective


SO-SNPN: Subscription Owner Standalone Non-Public Network


SOFA: Spatially Oriented Format for Acoustics


SOI: Start Of Interception


SON: Self Organizing / Optimizing Network


SOR: Steering of Roaming


SOR-AF: Steering Of Roaming Application Function


SOR-CMCI: Steering of roaming connected mode control information


SP: Semi-Persistent


SP-AF: Secured Packet Application Function


SP-CSI-RNTI: Semi-Persistent CSI RNTI


SPD: Security Problem Definition


SPDCCH: Short Physical Downlink Control channel


SPI: Security Parameters Index


SPID: Subscriber Profile ID for RAT / Frequency Priority


SPK: Signalling Protection Key


SPK-ID: Signalling Protection Key Identifier


SPL: Sound Pressure Level


SPR: Subscriber Profile Repository


SPRF: Satellite Payload RF


SPS: Semi-Persistent Scheduling


SPT: Service Point Trigger


SPUCCH: Short Physical Uplink Control channel


SQ: Scalar Quantization


SQN: Sequence number


SQRT: SQuare RooT


SR: Scheduling Request


SRAP: Sidelink Relay Adaptation Protocol


SRB: Signalling Radio Bearers


SRES: Signed RESponse calculated by a USIM


SRI: SRS Resource Indicator


SRM: Service Resource Manager


SRNC: Serving RNC


SRQR: Spherical Region-wise Quality Ranking


SRR: Session Reporting Rule


SRS: Sounding Reference Signals


SRS-RSRP: Sounding Reference Signal based Reference Signal Received Power


SRS-TPC-RNTI: Sounding Reference Symbols-Transmit Power Control-RNTI


SRTCP: Secure Real-time Transport Control Protocol


SRTP: Secure Real-time Transport Protocol


SRTP: Secure RTP


SRTP-MK: SRTP master key


SRTP-MKI: SRTP master key identifier


SRTP-MS: SRTP master salt


SRV: service request verification


SRVCC: Single Radio Voice Call Continuity


SS: Synchronization Signals


SS-RSRP: Synchronization Signal Reference Signal Received Power


SS-RSRPB: SS reference signal received power per branch


SS-RSRQ: Synchronization Signal Reference Signal Received Quality


SS-SINR: SS Signal-to-Interference-plus-Noise Ratio


SS7: Signalling System 7


SSAC: Service Specific Access Control


SSB: Synchronization Signal Block, SS / PBCH Block


SSB_RP: Received (linear) average power of the resource elements that carry NR SSB signals and channels, measured at the IAB-MT TAB connector or RIB


SSC: Service and Session Continuity


SSCMSP: Session and Service Continuity Mode Selection Policy


SSD: Source Statistics Descriptor


SSE: Server-Sent Events


SSF: Service Switching Function


SSH: Secure Shell


SSI: Server Side Includes


SSID: Service Set Identifier


SSIM: Slice Subscriber Identity Module


SSK: Secret Signing Key


SSL: Secure Sockets Layer


SSM: Source Specific IP Multicast (address)


SSO: Single Sign-On


SSP: Satellite Service Provider


SSR: State Space Representation


SSRC: Synchronization Source Identifier


SSS: Secondary Synchronization Signal


SSSG: Search Space Set Group


SSSS, S-SSS: Secondary sidelink synchronization signal (LTE), sidelink secondary synchronization signal (NR)


SST: Slice / Service Type


SSTD: SFN and Subframe Timing Difference


STA: Session Termination Answer


STAG: Secondary Timing Advance Group


STAR: Satellite Transport and Relay


STB: Set-Top-Box


STCH: Sidelink Traffic Channel


STD: Standard Deviation


STEC: Slant TEC


STF: Security Terminating Function


STI: Secure Telephone Identity


STI-AS: Secure Telephone Identity Authentication Service


STI-VS: Secure Telephone Identity Verification Service


STI-rSR: Session Transfer Identifier for reverse SRVCC


STIR: Secure Telephone Identity Revisited


STMR: Sidetone Masking Rating


STN: Session Transfer Number


STN-SR: Session Transfer Number - Single Radio


STR: Session Termination Request


STTI: Short TTI


STUN: Session Traversal Utilities for NAT


SU: Scheduling Unit


SU-MIMO: Single User MIMO


SUCI: Subscriber Concealed Identifier


SUID: Set owner User Idenification


SUL: Supplementary uplink


SUPI: Subscriber Permanent Identifier


SUPL: Secure User Plane Location


SURF: Speeded Up Robust Features


SV: Software Version