SVN: Satellite Virtual Network


SVN-: SVN Medium Access Control label


SW: Status Word


SWB: Super Wideband


SX3LIF: Split X3 LI Interworking Function


SYN: Synchrounous Transmission


SeGW: Security Gateway


SeGy: Security Gateway


SeNB: Secondary eNB


SectorID: Sector Address Identifier


SgNB: Secondary gNB


SoLSA: Support of Localised Service Areas


SoR: Steering of Roaming


SpCell: Special Cell


Sub: Subscriber


Succ: Success(es,ful)


T(R)x RU: Transmitter(receiver) Radio Unit


T-EAS: Target Edge Application Server


T-EES: Target Edge Enabler Server


T-GRUU: Temporary Globally Routable User Agent URI


T-PDU: Transport PDU


T-RPT: Time Resource Pattern of Transmission


TA: Timing Advance


TAA: Time-Averaging Algorithm


TAB: Transceiver Array Boundary


TAC: Tracking Area Code


TAD: Traffic Aggregate Description


TADV: Timing Advance


TAE: Time Alignment Error


TAG: Timing Advance Group


TAI: Tracking Area Identity


TAP: Transferred Account Procedure


TAS: Telephony Application Server


TAU: Tracking Area Update


TB: Terrestrial Beacon


TBCP: Talk Burst Control Protocol


TBG: Transport Block Group


TBS: Terrestrial Beacon System


TBoMS: TB processing over multi-slot PUSCH


TC: Test Case


TCE: Trace Collection Entity


TCG: Trusted Computing Group


TCH: Traffic channel


TCI: Transmission Configuration Indicator


TCL: Terminal coupling loss


TCLw: Terminal coupling loss (weighted)


TCP: Transmission Control Protocol


TDCP: Time Domain Channel Properties


TDD: Time Division Duplex


TDF: Traffic Detection Function


TDF-C: Traffic Detection Function Control plane function


TDF-U: Traffic Detection Function User plane function


TDL: Tapped Delay Line


TDM: Time Division Multiplexing


TDR: Traffic Duplication Resume


TDRA: Time domain resource allocation


TDS: Traffic Duplication Suspend


TE: Terminal Equipment, e.g. a computer (equal to DTE; Data Terminal Equipment)


TEC: Total Electron Content


TECU: TEC Units


TEG: Timing Error Group


TEID: Tunnel Endpoint Identifier


TEID-C: Tunnel Endpoint Identifier, control plane


TEID-U: Tunnel Endpoint Identifier, user plane


TEK: Traffic Encryption Key


TETRA: TErrestrial Trunked Radio


TF: Transit Functions


TFO: Tandem-Free Operation


TFT: Traffic Flow Template


TFTP: Trivial File Transfer Protocol


TGI: Temporary MCPTT Group Identity


TGK: Traffic Generating Key


THIG: Topology Hiding Inter-network Gateway


TI: Transaction Identifier


TIA: Telecommunications Industry Association


TIN: Temporary Identity used in Next update


TIP: Terminating Identification Presentation


TIR: Target Integrity Risk


TISPAN: Telecoms and Internet converged Services and Protocols for Advanced Network


TL: Talker Listener


TLE: Two-Line Element


TLIV: Type Length Instance Value


TLM: Telemetry


TLS: Transport Layer Security


TLTRI: T8 Long Term Transaction Reference ID


TLV: Tag Length Value


TM: Transmission mode


TMA: Tower Mounted Amplifier


TMD: TM Data


TMGI: Temporary Mobile Group Identity


TMMBN: Temporary Maximum Media Bit-rate Notification


TMMBR: Temporary Maximum Media Bit-rate Request


TMPI: Temporary IP Multimedia Private Identity


TN: Terrestrial Network


TNAN: Trusted Non-3GPP Access Network


TNAP: Trusted Network Access Point


TNGF: Trusted Non-3GPP Gateway Function


TNL: Transport Network Layer


TNLA: Transport Network Layer Association


TO: Transmission Occasion


TOA: Time Of Arrival


TOD: Time Of Day


TOW: Time Of Week


TP: Transmission Point


TP UE: TelePresence User Equipment


TPAE: Third Party Authorized Entity


TPC: Transmit Power Control


TPC-PUCCH-RNTI: Transmit Power Control-Physical Uplink Control Channel-RNTI


TPC-PUSCH-RNTI: Transmit Power Control-Physical Uplink Shared Channel-RNTI


TPC-RNTI: Transmit Power Control RNTI


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


TPM: Trusted Platform Module


TPMI: Transmitted Precoding Matrix Indicator


TPU: Tensor Processing Unit


TR: Technical Report


TRF: Transit and Roaming Function


TRIV: Time Resource Indicator Value


TRMS: Total Radiated Multi-antenna Sensitivity


TRP: Transmit / Receive Point


TRS: Tracking Reference Signal


TRSR: Trace Recording Session Reference


TRX: Transceiver


TS: Technical Specification


TS-SP: Time Sensitive Service Provider


TSC: Time Sensitive Communications


TSCAI: Time Sensitive Communication Assistance Information


TSCM: Transparent single-connection mode


TSCTS: Time Sensitive Communication and Time Synchronization


TSCTSF: Time Sensitive Communication and Time Synchronization Function


TSI: Transport Session Identifier


TSN: Time Sensitive Networking


TSN AF: Time Sensitive Networking Application Function


TSN GM: TSN Grand Master


TSN-SC: TSN Service Customer


TSN-SP: Time Sensitive Networking Service Provider


TSP: Traffic Steering Policy


TSS: Timing Synchronization Status


TSSF: Traffic Steering Support Function


TT: TSN Translator


TTA: Time To Alert


TTFF: Time To First Fix


TTI: Transmission Time Interval


TTL: Time To Live


TTML: Timed Text Markup Language


TTT: Time To Trigger


TTTP: Transfer To Third Party


TURN: Traversal Using Relay NAT


TV: Television


TVE: Total Vector Error


TWAG: Trusted WLAN Access Gateway


TWAN: Trusted WLAN Access Network


TWAP: Trusted WLAN Access Point


TWIF: Trusted WLAN Interworking Function


TX: Transmission


Tbps: Terabits per second


ToF: Time of Flight


ToS: Type of Service


TrCH: Transport Channel


TrFO: Transcoder-Free Operation


TrGW: Transit Gateway


TrK: KMS Transport Key


TrK-ID: KMS Transport Key Identifier


Tx: Transmitter


TxD: Tx Diversity


TxRU: Transceiver Unit


TxTEG: Tx Timing Error Group


U-plane: User plane


U2N: UE-to-Network


U2U: UE-to-UE


U2X: UAV to everything


U2XP: U2X Policy


UA: User Agent


UAC: Unified Access Control


UAD: UE Assistance Data


UAE: UAS Application Enabler


UAM: Urban Air Mobility


UARFCN: UTRA Absolute Radio Frequency Channel Number


UAS: Uncrewed Arial System


UAS NF: Uncrewed Aerial System Network Function


UAS-NF: Uncrewed Aerial System Network Function


UASS: UAS Application Specific Server


UAT: UE Assistance data Termination


UAV: Uncrewed Aerial Vehicle


UAV-C: Unmanned Aerial Vehicle-Controller


UAV-C/UAVC: Uncrewed Aerial Vehicle Controller


UBF: UE beam lock function


UC: User Client


UCI: Uplink Control Information


UCMF: UE radio Capability Management Function


UDC: User Data Convergence


UDDI: Universal Description, Discovery and Integration


UDI: Unrestricted Digital Information


UDM: User Data Management


UDP: User Datagram Protocol


UDPTL: Facsimile UDP Transport Layer (protocol)


UDR: Unified Data Repository


UDRE: User Differential Range Error


UDSF: Unstructured Data Storage Function


UDT: User Data Transfer


UDVM: Universal Decompressor Virtual Machine


UE: User Equipment


UE-AMBR: UE-Aggregate Maximum Bitrate


UE-Slice-MBR: UE Slice Maximum Bit Rate


UEA: UMTS Encryption Algorithm


UEM: operating band Unwanted Emissions Mask


UEUT: User Equipment Under Test


UHD: Ultra High Definition


UHF: Ultra-high frequency


UIA: UMTS Integrity Algorithm


UIC: Union Internationale des Chemins de Fer


UICC: Universal Integrated Circuit Card


UID: User Identifier for MIKEY-SAKKE


UKEK: Unique Key Encryption Key


UL: Uplink


UL CL: Uplink Classifier


UL MIMO: Uplink Multiple Antenna transmission


UL SRS-RSRPP: UL SRS reference signal received path power


UL TFT: UpLink Traffic Flow Template


UL-AoA: Uplink Angle of Arrival


UL-RSCP: Uplink Reference Signal Carrier Phase


UL-RTOA: Uplink Relative Time of Arrival


UL-SCH: Uplink Shared Channel


UL-SRS: Uplink Sounding Reference Signal


UL-TDOA: Uplink Time Difference of Arrival


ULA: Uniform Linear Array


ULFPTx: Uplink Full Power Transmission


ULI: User Location Information


ULP: User Plane Location Protocol


ULR: Update Location Request


ULR-Flags: Update Location Request Flags


ULSUP: Uplink sharing from UE perspective


UM: Unacknowledged Mode


UMD: UM Data


UMIC: User plane node Management Information Container


UMS: User plane node Management Service


UMTS: Universal Mobile Telecommunication System


UMa: Urban Macro


UMi: Urban Micro


UNAN: Untrusted Non-3GPP Access Network


UNI: User-to-Network Interface


UP: User Plane


UP-EDT: User Plane EDT


UP-PRUK: User Plane ProSe Remote User Key


UPCMI: 13-bit Uniform PCM Interface


UPDS: UE policy delivery service


UPF: User Plane Function


UPH: Uplink PH


UPP-CM: User Plane Positioning Connection Management


UPS: Uninterruptable Power Supply


UPSC: UE Policy Section Code


UPSI: UE Policy Section Identifier


UPT: User Perceived Throughput


UPU: UE Parameters Update


UPnP: Universal Plug and Play


URA: UTRAN Registration Area


URI: Uniform Resource Identifier


URL: Uniform Resource Locator


URLLC: Ultra Reliable Low Latency Communication


URN: Uniform Resource Name


URPP-SGSN: User Reachability Request Parameter for SGSN


URR: Usage Reporting Rule


URRP-AMF: UE Reachability Request Parameter for AMF


URRP-MME: UE Reachability Request Parameter for MME


URSP: UE Route Selection Policy


US: Universal  Telecommunications System


USAT: Universal Subscriber Identity Module Application Toolkit


USB: Universal Serial Bus


USB-C: USB Type-C connector / socket


USD: User Service Description


USIM: Universal Subscriber Identity Module


USNO: US Naval Observatory


USP: User Services Platform


USS: UAS Service Supplier


USSD: Unstructured Supplementary Service Data


UT1: Universal Time No.1


UTC: Coordinated Universal Time


UTDOA: Uplink Time Difference of Arrival


UTM: UAS Traffic Management


UTO-UCI: Unused Transmission Occasion - Uplink Control Information


UTRA: Universal Terrestrial Radio Access network


UTRAN: Universal Terrestrial Radio Access Network


UTW: Uplink Time Window


UUAA: USS UAV AA


UUID: Universally Unique IDentifier


UWAN: Untrusted Wireless Access Network


UpPTS: Uplink Pilot Time Slot


V-AF: Visited AF


V-ANDSF: Visited-ANDSF


V-CHF: A CHF in VPLMN


V-DRA: Visited DRA


V-ECS: Visited Edge Configuration Server


V-EES: Visited Edge Enabler Server


V-PCC: Video-based Point Cloud Compression


V-PCF: Visited Policy Control Function


V-PCRF: Visited PCRF


V-SMF: Visited SMF


V-UDR: A UDR in the VPLMN


V2I: Vehicle-to-Infrastructure


V2N: Vehicle-to-Network


V2P: Vehicle-to-Pedestrian


V2V: Vehicle-to-Vehicle


V2X: Vehicle-to-Everything


V2XP: Vehicle-to-Everything Policy


V3C: Visual Volumetric Video-based Coding


VAE: V2X Application Enabler


VAE-C: V2X Application Enabler Client


VAE-S: V2X Application Enabler Server


VAL: Vertical Application Layer


VAM: VRU awareness message


VAS: Value Added Service


VASP: Value Added Service Provider


VASS: V2X Application Specific Server


VBR: Variable BitRate


VBS: Voice Broadcast Service


VCC: Voice Call Continuity


VCL: Video Coding Layer


VCS: Voice Call Service


VDE: Video Decoding Engine


VDI: Video Decoding Interface


VDN: VCC Domain transfer Number


VDP: Viewport Dependent Processing


VGA: Variable Gain Amplifier


VGCS: Voice Group Call Service


VGMLC: Visited GMLC


VID: VLAN Identifier


VIM: Virtualized Infrastructure Manager


VLAN: Virtual Local Area Network


VLBA: Very Long Baseline Array


VLR: Visitor Location Register


VM: Virtual Machine


VMR: Vehicle Mounted Relay


VMSC: Visited MSC


VN: Virtual Network


VNF: Virtualised Network Function


VNFC: Virtual Network Function Component


VNFM: Virtualized Network Function Manager


VNO: Virtual Network Operator


VOP: Video Object Plane


VPC: VoIP Positioning Centre


VPL: Vertical Protection Level


VPLMN: Visited PLMN


VPN: Virtual Private Network


VPS: VPLMN Specific


VPU: Vision Processing Unit


VQ: Vector Quantization


VR: Virtual Reality


VRB: Virtual Resource Block


VRU: Vulnerable Road Users


VRUP: Vulnerable Road User Protection


VST: Virtual Studio Technology


VSWR: Voltage Standing Wave Ratio


VUI: Video Usability Information


VVC: Versatile Video Coding


VoIP: Voice over IP


VoLTE: Voice over Long Term Evolution


W-5GAN: Wireline 5G Access Network


W-5GBAN: Wireline 5G BBF Access Network


W-5GCAN: Wireline 5G Cable Access Network


W-AFG: Wireline Access Gateway Function


W-AGF: Wireline Access Gateway Function


W-APN: WLAN APN


W-CP: Wireline access Control Plane protocol


W-UP: Wireline access User Plane protocol


W3C: World Wide Web Consortium


WA: Wide Area


WAAS: Wide Area Augmentation System


WAN: Wide Area Network


WAS: Web Application Security


WATP: Wayside Automatic Train Protection


WAVE: Web Application Video Ecosystem


WB: Wideband


WB-E-UTRAN: Wide Band E-UTRAN


WCBW: Wider Channel Bandwidth (Existing immediate wider channel bandwidth)


WEA: Wireless Emergency Alert


WGS: World Geodetic System


WGS-84: World Geodetic System 1984


WI: Work Item


WIC: WebRTC IMS Client


WIM: Wireless Identity Module


WLAN: Wireless Local Area Network


WLANSP: WLAN Selection Policy


WLAR: WireLess tethered AR glasses


WLCP: Wireless LAN control plane protocol


WMF: WiMAX Forum


WMM: Wifi Multimedia


WMOPS: Weighted Millions of Operations Per Second


WMTS: Wireless Medical Telemetry Service


WPA: Wrong Password Attempts


WPKI: Wireless PKI


WSDL: Web Services Description Language


WSID: WLAN Specific Identifier


WT: WLAN Termination


WTAR: Wired Tethered AR glasses


WTLS: Wireless Transport Layer Security


WUS: Wake Up Signal


WWSF: WebRTC Web Server Function


WebDAV: Web Distributed Authoring and Versioning


WebRTC: Web Real-Time Communication


WiMAX: Worldwide Interoperability for Microwave Access


X-MAC: Computed MAC-I


X2 GW: X2 GateWay


X2-C: X2-Control plane


X2-U: X2-User plane


XCAP: XML Configuration Access Protocol


XDM: XML Document Management


XDMC: XML Document Management Client


XDMS: XML Document Management Server


XER: XML Encoding Rules


XGPON1: 10 Gigabit-capable Passive Optical Networks


XHR: XML HTTP Request


XMAC: expected


XML: EXtensible Markup Language


XMPP: eXtensible Messaging and Presence Protocol


XPK: XML Protection Key


XPR: Cross-Polarization Ratio


XR: Extended Reality


XRES: Expected authentication response


XSD: XML Schema Definition


XUI: XCAP Unique Identifier


Xn-C: Xn Control plane


Xn-U: Xn User plane


XnAP: Xn Application Protocol


Xw-C: Xw-Control plane


Xw-U: Xw-User plane


YAML: Yet Another Markup Language


Z-AoA: Zenith Angles of Arrival


ZF: Zero Forcing


ZOA: Zenith angle Of Arrival


ZOD: Zenith angle Of Departure


ZP CSI-RS: Zero Power CSI-RS


ZSA: Zenith angle Spread of Arrival


ZSD: Zenith angle Spread of Departure


Za: Interface between SEGs belonging to different networks / security domains (a Za interface may be an intra or an inter operator interface).


Zb: Interface between SEGs and NEs and interface between NEs within the same network / security domain


_ID: Network Control Center Identifier


cDRX: Connected Mode DRX


cIPX: consumer's IPX


cNRF: consumer's NRF


cPLMN: consumer's PLMN


cSEPP: consumer's SEPP


cps: characters per second


e.r.p.: Effective Radiated Power


e2DCe: End-to-Data-Channel edge


e2ae: End-to-access edge


e2ae-security: End-to-access edge security


e2e: End-to-end


eAN: evolved Access Network


eAN/PCF: Evolved Access Network Packet Control Function


eCFR: electronic Code of Federal Regulation


eCNAM: Enhanced Calling Name


eDRX: Extended Discontinuous Reception


eFMSS: Enhancement to Flexible Mobile Service Steering


eHRPD: evolved High Rate Packet Data


eIMTA: Enhanced Interference Management and Traffic Adaptation


eIMTA-RNTI: Enhanced Interference Management and Traffic Adaptation - RNTI


eKSI: Key Set Identifier for E-UTRAN


eMBB: Enhanced Mobile Broadband


eMLPP: Enhanced Multi-Level Precedence and Pre-emption Service


eMMTEL: Evolution of IMS Multimedia Telephony Service


eMPS: enhanced Multimedia Priority Service


eMTC: enhanced Machine-Type Communication


eNB: Evolved NodeB


eNode B: Evolved Node B


eNodeB: Evolved Node B


eP-CSCF: P-CSCF enhanced for WebRTC


ePDG: evolved Packet Data Gateway


ePWS: enhancements of Public Warning System


eRG: Evolved Residential Gateway


eRedCap: Enhanced Reduced Capability


eV2X: Enhanced V2X


gNB: next Generation Node B


gNB-CU: gNB-Central Unit


gNB-CU-CP: gNB-Control Unit Control Plane


gNB-CU-UP: gNB-Control Unit User Plane


gNB-DU: gNB-Distributed Unit


glTF: Graphics Library Transmission Format


gsmSCF: GSM Service Control Function


gsmSSF: GSM Service Switching Function


hNSACF: HPLMN NSACF


kB: Kilobyte (1000 bytes)


kbit: kilobit (1000 bits)


kbps: Kilobits per second


mIAB: Mobile IAB


mIAB-DU: Mobile IAB Distributed Unit


mIAB-MT: Mobile IAB Mobile Termination


mTRP: Multiple TRP


msd: mean solar day


n/a: not applicable


ng-eNB: Next Generation Evolved Node-B


ngKSI: Key Set Identifier for Next Generation Radio Access Network


pIPX: producer's IPX


pNRF: producer's NRF


pPLMN: producer's PLMN


pSEPP: producer's SEPP


pTAG: Primary Timing Advance Group


posSI: Positioning System Information


posSIB: Positioning System Information Block


rIK: re-authentication Integrity Key


rMSK: re-authentication Master Session Key


rRK: re-authentication Root Key


rUC: representative Use Case


rms: root mean square


sCCE: short Control Channel Element


sPDCCH: shortened Physical Downlink Control Channel


sPDSCH: shortened Physical Downlink Shared Channel


sREG: short Resource-Element Group


sTAG: Secondary Timing Advance Group


sTRP: Serving TRP


sTTI: Slot or subslot TTI


vNSACF: VPLMN NSACF


vSRVCC: Single Radio Video Call Continuity


xCC: LI_X3 Communications Content


xDSL: Digital Subscriber Line (all types)


xIRI: LI_X2 Intercept Related Information