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    Glossary of Wireless Acronyms

    1x Short for 1xRTT

    1xCS 1x Circuit Switched1xCSFB 1x Circuit Switched Fallback1xEV-DO CDMA20001xEV-DO or 1 times Evolution-Data Optimized or

    Evolution-Data Only1xEV-DV CDMA20001xEV-DV or 1 times Evolution-Data Voice1xRTT 1 times Radio Transmission Technology (CDMA20001xRTT technology)1xSRVCC 1x Single Radio Voice Call Continuity2G Second Generation2G-CS/3G-CS 2G Circuit Switched/ 3G Circuit Switched3G Third Generation3G+ 3G plus, used to reference technologies considered beyond 3G such as HSPA, HSPA+

    or LTE, not an officially recognized term by 3GPP3GPP 3rd Generation Partnership Project

    3GPP2 3rd Generation Partnership Project 24C-HSDPA Four Carrier HSDPA4G Fourth Generation

    AA Adaptive ArrayAAA Authentication, Authorization and AccountingAAS Active Antenna SystemsABS Almost Blank SubframesACK/NAK Acknowledgement/Negative AcknowledgementADC Application Detection and ControlADSL Asymmetric Digital Subscriber LineAES Advanced Encryption StandardAF Application FunctionAKA Authentication and Key AgreementAM Acknowledged ModeAMBR Aggregate Maximum Bit RateANR Automatic Neighbor RelationAPI Application Programming InterfacesAPN Access Point NameARP Allocation and Retention PriorityARPU Average Revenue per UserARQ Automatic Repeat RequestAS Access StratumAS Application ServerASIC Application-Specific Integrated CircuitASME Access Security Management EntityATCA Advanced Telecommunication Computing ArchitectureATCF Access Transfer Control Function

    ATIS/TIA Alliance for Telecommunications Industry Solutions/Telecommunications IndustryAssociation

    ATM Automated Teller MachineAuC Authentication CenterAWS Advanced Wireless Spectrumb/s/Hz Bits per Second per HertzB2BUA Back-to-Back User AgentB2C Business-to-ConsumerBBERF Bearer Binding and Event Reporting Function

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    BBF Broadband ForumBCH Broadcast ChannelBF BeamformingBIP Bearer Independent ProtocolBM-SC Broadcast Multicast Service Center

    Bps/Hz Bits per second per HertzBPSK Binary Phase Key ShiftingBSC Base Station ControllerBSK Binary Shift KeyingBSR Base Station RouterBTS Base Transceiver StationBW BandwidthC/I Carrier to Interference Ratio (CIR)CA Carrier AggregationCAGR Compound Annual Growth RateCAPEX Capital ExpensesCAT_TP Card Application Toolkit Transport ProtocolCAZAC Constant Amplitude Zero Autocorrelation Waveform

    CBC Cell Broadcast CenterCBE Cell Broadcast EntityCBF Coordinated BeamformingCBS Coordinated Beam SwitchingCC Component CarrierCCE Control Channel ElementsCCO Cell Change OrderCDD Cyclic Delay DiversityCDF Cumulative Distribution FunctionCDM Code Division MultiplexingCDMA Code Division Multiple AccessCDO Care Delivery OrganizationCE Congestion Experienced

    CELL_DCH UTRAN RRC state where UE has dedicated resourcesCELL_FACH UTRAN RRC transition state between Cell_PCH and Cell_DCHCELL_PCH UTRAN RRC state where UE has no dedicated resources are allocatedCID Cell IdentificationCIF Carrier Indication FieldCK/IK Ciphering Key/Integrity KeyCL Circular LetterCL-MIMO Closed-Loop Multiple-Input Multiple-OutputCMAS Commercial Mobile Alert ServiceCMS Communication and Media SolutionsCMSAAC FCC Commercial Mobile Service Alert Advisory CommitteeCMSP Commercial Mobile Service ProviderCN Core NetworkCoA Care of Address

    CoMP Coordinated Multipoint TransmissionCP Cyclic PrefixCPC Continuous Packet ConnectivityCPE Customer premise EquipmentC-Plane Control PlaneCQI Channel Quality IndicationsCRC Cyclic Redundancy CheckCRS Common Reference SignalsCS Circuit Switched

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    CSCF Call Session Control FunctionCSFB Circuit Switched FallbackCSG Closed Subscriber GroupCSI Channel State InformationCSP Communication Service Provider

    CTIA Cellular Telecommunication Industry AssociationCTR Click-Through RateD2D Device to DeviceDC Dual CarrierDCH Dedicated ChannelDC-HSDPA Dual Carrier- High Speed Downlink Packet AccessDC-HSPA Dual Carrier- High Speed Packet AccessDC-HSUPA Dual Carrier- High Speed Uplink Packet AccessDCI Downlink Control InformationDES Data Encryption StandardDFE Decision Feedback EqualizerDFT Discrete Fourier TransformationDFT-S-OFDM Discrete Fourier Transformation-Spread-Orthogonal Frequency

    Division MultiplexingDHCP Dynamic Host Configuration ProtocolDIAMETER/MAP Diameter Message Automation & ProtocolD-ICIC Dynamic Interference CoordinationDIP Dominant Interferer ProportionDL DownlinkDLDC Downlink Dual CarrierDL-SCH Downlink Shared ChannelDM Dispersion MeasureDMB Digital Multimedia BroadcastingDNBS Distributed NodeB SolutionDMRS Demodulation Reference SignalDPCH Dedicated Physical Channel

    DPS Dynamic Point SelectionDRX Discontinuous ReceptionDS Dual StackDS-MIPv6 Dual Stack-Mobile Internet Protocol version 6DSP Dual Slant PoleDT Drive TestDVB Digital Video BroadcastDVB-H Digital Video Broadcast-HandheldDwPTS Downlink Pilot Time SlotE2E End-to-EndEAB Enhanced Access BarringE-AGCH Enhanced- Absolute Grant ChannelEATF Emergency Access Transfer FunctionE-CID Enhanced Cell Identification

    ECN Explicit Congestion NotificationECN-CE Explicit Congestion Notification-Congestion ExperiencedE-CSCF Enhanced- Call Session Control FunctionECT Explicit Congestion Notification-Capable TransportE-DCH Enhanced Dedicated Channel (also known as HSUPA)EDGE Enhanced Data rates for GSM EvolutionEEDGE Evolved EDGEEEM/USB Ethernet Emulation Model/Universal Serial BusEGPRS Enhanced GPRS

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    E-HICH E-DCH Hybrid ARQ Indicator ChanneleICIC Enhanced Inter-Cell Interference CoordinationEIR Equipment Identity RegistereMPS Enhancements for Multimedia Priority ServiceeNB Evolved NodeB, E-UTRAN NodeB

    eNodeB Evolved NodeBENUM Telephone Number Mapping from E.164 Number MappingEPC Evolved Packet Core; also known as SAE (refers to flatter-IP core network)EPDCCH Enhanced Physical Downlink Control CHannelEPDG Evolved Packet Data GatewayEPRE Energy per Resource ElementEPS Evolved Packet System is the combination of the EPC/SAE (refers to flatter-IP core

    network) and the LTE/E-UTRANE-RAB Enhanced Radio Access BearerE-RGCH E-DCH Relative Grant ChannelE-SMLC Enhanced Serving Mobile Location CenterESM Energy Savings ManagementETSI European Telecommunication Standards Institute

    ETWS Earthquake and Tsunami Warning SystemEUTRA Evolved Universal Terrestrial Radio AccessE-UTRAN Evolved Universal Terrestrial Radio Access Network (based on OFDMA)EV-DO Evolution Data Optimized or Data OnlyFACH Fast Access CHannelFCC Federal Communications CommissionFDD Frequency Division DuplexFDM Frequency Division MultiplexFDMA Frequency Division Multiple AccessF-DPCH Fractional-DPCHFDS Frequency Diverse SchedulingFeICIC Further Enhanced Inter-Cell Interference CoordinationFEMA Federal Emergency Management Agency

    FER Frame Erasure RateFFR Fractional Frequency ReuseFFS For Further StudyFIR Finite Impulse ResponseFMC Fixed Mobile ConvergenceFOMA Freedom of Mobile Multimedia Access: brand name for the 3G services offered by

    Japanese mobile phone operator NTT DoCoMo.FQDN Fully Qualified Domain NamesFSS Frequency Selected SchedulingFSTD Frequency Selective Transmit DiversityFTTH Fiber to the HomeFTTN Fiber to the NodeGB Gigabyte also called gbitGbit/s Gigabytes per second

    GBR Guaranteed Bit RateGERAN GSM EDGE Radio Access NetworkGGSN Gateway GPRS Support NodeGHz GigahertzGi Interface between GPRS and external data networkGLONASS Global Navigation Satellite System (Russian)GMLC Gateway Mobile Location ControllerGn IP-based interface between SGSN and other SGSNs and (internal) GGSNs. DNS also

    shares this interface. Uses the GTP Protocol

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    GNSS Global Navigation Satellite SystemGp Guard PeriodGPRS General Packet Radio SystemGPS Global Positioning SystemGRE Generic Routing Encapsulation

    GSM Global System for Mobile communicationsGSMA GSM AssociationGTP GPRS Tunneling ProtocolGTP-U The part of GTP used for transfer of user dataGTPv2 GPRS Tunneling Protocol version 2GUTI Globally Unique Temporary IdentityGW GatewayGxa, Gxb, Gxc IMS reference pointsH2H Human to HumanHARQ Hybrid Automatic Repeat RequestHCI Host Controller InterfaceHD High DefinitionHeNB Home eNodeB

    HeNB-GW Home eNodeB GatewayHLR Home Location RegisterHNB Home NodeBHNB-GW Home NodeB GatewayHO HandoverHOM Higher Order ModulationHPCRF Home PCRFHPLMN Home PLMNHPM Hosting Party ModuleHPSIM Hosting Party Subscription Identity ModuleHRPD High Rate Packet Data (commonly known as 1xEV-DO)HSDPA High Speed Downlink Packet AccessHS-DPCCH High Speed-Dedicated Physical Control Channel

    HS-DSCH High Speed-Downlink Shared ChannelHSI High Speed InternetHSPA High Speed Packet Access (HSDPA + HSUPA)HSPA + High Speed Packet Access Plus (also known as HSPA Evolution or

    Evolved HSPA)HSS Home Subscriber ServerHS-FACH High Speed Fast Access CHannelHS-RACH High Speed Random Access CHannelHS-SCCH High Speed - Shared Control CHannelHSUPA High Speed Uplink Packet AccessHTML Hyper-Text Markup LanguageHTTP Hyper Text Transfer ProtocolHTTPS Hypertext Transfer Protocol SecureI/Q In-phase Quadrature referring to the COMPONENTS used in quadrature amplitude

    modulationICE In Case of EmergencyIC Inter-CellICIC Inter-Cell Interference CoordinationICS IMS Centralized ServicesICT Information and Communication TechnologyID IdentificationIDFT Inverse Discreet Fourier TransformIEC International Engineering Consortium

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    IEEE Professional association for engineering, computing and technologyIETF RFC Internet Engineering Task Force Request for CommentsIFFT Inverse Fast Fourier TransformationIFOM Internet Protocol Flow Mobility and seamless WLAN OffloadI-HSPA Internet-High Speed Packet Access

    IKEv2 Internet Key Exchange version 2IM Instant MessagingIMEI-SV International Mobile Equipment Identity?? P 98IMS IP Multimedia SubsystemIMS-MMTel IP Multimedia Subsystem Multi-Media Telephony serviceIMSI International Mobile Subscriber IdentityIN Intelligent NetworkingION Intelligent Optical NetworkIP Internet ProtocolIP-CAN Internet Protocol Connectivity Access NetworkIPR Intellectual Property RightsIPSec Internet Protocol SecurityIPv6 Internet Protocol version 6

    IPX IP Packet ExchangeIRAT Inter-Radio Access TechnologyIRC Interference Rejection CombiningIRP Integration Reference PointISM Industrial, Scientific and MedicalISO International Standardization OrganizationISP Internet Service ProviderISUP ISDN User PartIT Internet TechnologyItf-N Interface NITU International Telecommunication UnionITU-R ITU-Radiotelecommunication SectorITU-T ITU-Telecommunication Standardization Section

    Iur Interface between two RNCsIUT Inter-UE TransferIVR Interactive Voice ResponseIWF Interworking FunctionIWS Interworking SignallingJ2ME Java 2 Platform, Micro Edition which is now called Java Platform for Mobile Devices

    and Embedded ModulesJDBC Java Database ConnectivityJP Joint ProcessingJP-Co Coherent Joint ProcessingJP/JT Joint Processing/Joint TransmissionJP-Nco Non-Coherent Joint ProcessingJ-STD-101 Joint ATIS/TIA CMAS Federal Alert Gateway to CMSP Gateway Interface SpecificationK_ASME ASME Key

    kbps Kilobits per SecondkHz Kilohertzkm/h Kilometers per hourLAI Location Area IdentificationLATRED Latency ReductionLBS Location Based ServicesLCD Liquid Crystal DisplayLCR Low Chip-RateLCS Location Service

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    LDAP Lightweight Directory Access ProtocolL-GW Local GatewayLh Interface between the GMLC/LRF and the HLR/HSSLI Lawful InterceptLIPA Local Internet Protocol Access

    LMMSE Linear Minimum Mean Square ErrorLMU Location Measurement UnitsLpp Interface between the GMLC/LRF and the PPRLPP LTE Positioning ProtocolLPPa LTE Positioning Protocol ALr Interface between the GMLC/LRF and LIMS-IWFLRF Laser Range FinderLSTI LTE/SAE Standard Trial InitiativeLTE Long Term Evolution (Evolved Air Interface based on OFDMA)LTE-A LTE-AdvancedLTI Linear Time InvariantM2 Interface Interface between the Multi-cell/multicast Coordination Entity and the eNodeBM2M Machine-to-Machine

    m Metersmb Megabit or MbMAC Media Access ControlMAG Mobile Access GatewayMAPCON Multi-Access PDN ConnectivityMBMS Multimedia Broadcast/Multicast ServiceMbps Megabits per SecondMBR Maximum Bit RateMBSFN Multicast Broadcast Single Frequency NetworksMCH Multicast ChannelMCM Multimedia Carrier ModulationMCS Modulation and Coding SchemeMCE Mulit-cell/Multicast Coordination Entity

    MCW Multiple CodewordsMDT Minimization of Drive TestsMES Multimedia Emergency SessionMFF M2M Form FactorMFS Mobile Financial ServicesMHz MegahertzMI Interface between the GMLC/LRF and the E-CSCFMIB Master Information BlockMID Mobile Internet DeviceMIM M2M Identity ModuleMIMO Multiple-Input Multiple-OutputMIP Mobile IPMITE IMS Multimedia Telephony Communication EnablerMLC Mobile Location Center

    MLSE Maximum Likelihood Sequence EstimationMMD Multi-Media DomainMME Mobility Management EntityMMS Multimedia Messaging ServiceMMSE Multimedia Messaging Service EnvironmentMNO Mobile Network OperatorMO Mobile OriginatedMOBIKE Mobility and Multi-homing Protocol for Internet Key ExchangeMO-LR Mobile Originating-Location Request

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    MP3 MPEG-1 (Motion Picture Experts Group) Audio Layer-3 for compressing sound intovery small audio files

    MRFP Multimedia Resource Function Processorms MillisecondsMSA Metropolitan Statistical Area

    MSC Mobile Switching CenterMSISDN Mobile Station International ISDN Number

    MSRD MS Receive DiversityMSS Mobile Softswitch SolutionMT Mobile TerminatedMTC Machine-Type CommunicationMTC-AAA Machine Type Communication - Authentication, Authorization and AccountingMTC-IWF Machine Type Communication Interworking FunctionMT-LR Mobile Terminated Location RequestMTSI Multimedia Telephony Service for IMSMU-MIMO Multi-User Multiple-Input Multiple-OutputMVNO Mobile Virtual Network OperatorNACC Network Assisted Cell Change

    NAI Network Access IdentifierNAS Non Access StratumNCE Noncommercial EducationalNDS Network Domain SecurityNFC Near Field CommunicationsNGMN Next Generation Mobile Networks AllianceNGN Next Generation NetworkNGOSS Next Generation Operations Support Systems (HP)NI-LR Network Induced Location RequestNIMTC Network Improvements for Machine-Type CommunicationNMR Network Measure ReportNOVES Non-Voice Emergency ServesNPRM Notice of Proposed Rule Making

    NRT Neighbor Relation TableNWS National Weather ServiceNxDFT-S-OFDM N times Discrete Fourier Transforms Spread Orthogonal Frequency Division

    MultiplexingO&M Operations and MaintenanceOAM/OA&M Operations, Administration and MaintenanceOCC Orthogonal Cover Code

    OCS Online Charging System

    OECD Organization for Economic Cooperation and Development

    OFDM Orthogonal Frequency Division Multiplexing

    OFDMA Orthogonal Frequency Division Multiplexing Access (air interface)OL-MIMO Open Loop Multiple-Input Multiple-OutputOMA Open Mobile Architecture

    OMA-DS OMA Data SynchronizationOP Organizational PartnerOPEX Operating ExpensesOS Operating SystemOTA Over the AirOTDOA Observed Time Difference of ArrivalOTT Over The TopPAM Priority Alarm MessagePAPR Peak to Average Power Ratio

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    PAR Peak to Average RatioPARC Per-Antenna Rate ControlPBCH Primary BCHPC Physical ChannelPCC Policy and Charging Convergence

    PCD Personal Content DeliveryPCEF Policy and Charging Enforcement FunctionPCFICH Physical Control Format Indicator ChannelPCH Paging ChannelPCI Physical Cell IDPCMM Packaged Core Memory ModelPCO Power Control Optimization OR Point of Control and Observation (ITU-T)PCRF Policy and Changing Rules FunctionP-CSCF Proxy Call Session Control FunctionPDA Personal Desktop AssistantPDCCH Physical Downlink Control ChannelPDCP Packet Data Convergence ProtocolPDG Packet Data Gateway

    PDN Public Data NetworkPDP Packet Data ProtocolPDSCH Physical Downlink Shared ChannelPDU Packet Data UnitP-GW PDN GatewayPHICH Physical Hybrid ARQ Indicator ChannelPHY/MAC Physical layer/Medium Access ControlPLMN Public Land Mobile NetworkPMCH Physical Multicast ChannelPMI Precoding Matrix IndexPMIP Proxy Mobile IPv6PND Personal Navigation DevicePoA Point of Attachment

    PoC Push-to-Talk over CellularPPR Push-Profile-RequestPRACH Physical Random Access ChannelPRB Physical Resource BlockPS Packet SwitchedPSAP Public Safety Answering PointP-SCH Primary Synchronization SignalPSRC Per Stream Rate ControlPSS/SSS Primary Synchronization Signal/Secondary Synchronization SignalPUCCH Physical Uplink Control ChannelPUSCH Physical Uplink Shared ChannelPWS Public Warning SystemQAM Quadrature Amplitude ModulationQCI QoS Class Index

    QoS Quality of ServiceQPP Quadratic Polynomial PermutationQPSK Quadrature Phase Shift KeyingQt Cutie is a cross application development frameworkQWERTY Of, relating to, or designating the traditional configuration of typewriter or computer

    keyboard keys. Q, W, E, R, T and Y are the letters on the top left, alphabetic row.

    QZSS Quasi Zenith Satellite SystemR&D Research and DevelopmentRAB Radio Access Bearer

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    RACH Random Access ChannelRADIUS AAA Remote Authentication Dial In User Service for Authentication, Authorization, and

    Accounting management for computers to connect and use a network serviceRAM Remote Application ManagementRAN Radio Access Network

    RAN1 Working group within 3GPP focused on physical layer specificationsRAN4 Working group within 3GPP focused on radio performance and protocol aspectsRAT Radio Access TechnologyRB Radio Bearer or Resource BlocksRE Resource ElementREG Resource Element GroupRel-X Release 99, Release 4, Release 5, etc. from 3GPP standardizationRF Radio FrequencyRf/Ga GPRS/Web services interface to record data for offline chargingRG Residential GatewayRI Rank IndicatorRIT Radio Interface TechnologyRLC Radio Link Control Layer

    RLF Radio Link FailureRN Relay NodeRNC Radio Network ControllerRNTI Radio Network Temporary IdentifierR-PDCCH Reverse Packet Data Control CHannelRRC Radio Resource ControlRRH Remote Radar HeadRRM Radio Resource ManagementRRU Remote Radio UnitRS Reference SignalRSRP Reference Signal Received PowerrSRVCC Reverse Single Radio Vocie Call ContinuityRTCP RTP Control Protocol

    RTP/UDP Real-Time Transport Protocol/User Datagram ProtocolRx ReceiveS1AP S1 Application ProtocolSAE System Architecture Evolution also known as Evolved Packet Core (EPC) architecture

    (refers to flatter-IP core network)SAE GW Service Architecture Evolution GatewaySBAS Space Based Augmentation SystemSBLB Service Based Local PolicySC Service ContinuitySC-FDMA Synchronization Channel-Frequency Division Multiple AccessSCH Synchronization ChannelSCS Services Capability ServerS-CSCF Serving-Call Session Control FunctionSCW Single Codeword

    SCWS Smart Card Web ServerSDK Software Development KitSDMA Space Division Multiple AccessSDO Standard Development OrganizationSDP Service Delivery PlatformSDR Software Defined RadioSDU Service Data UnitSeGW Security GatewaySFBA Switch Fixed Beam Array

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    SFBC Space Frequency Block CodeSFN Single Frequency NetworkSG Serving GatewaySGi Reference point between the PDN-GW and the packet data networkSGSN Serving GPRS Support Node

    S-GW Serving GatewaySIC Successive Interference CancellationS-ICIC Static Interference CoordinationSIM Subscriber Identity ModuleSIMO Single-Input Multiple-OutputSIMTC System Improvements for Machine Type CommunicationSINR Signal-to-Interference plus Noise RatioSIP Session Initiated ProtocolSIPTO Selected Internet Protocol Traffic OffloadSIP-URI Session Initiated Protocol -Uniform Resource IdentifierSIR Signal-to-Interference RatioSISO Single-Input Single-OutputSLA Service Level Agreement

    SLg Interface between the MME and the GMLCSLs Interface between the MME and the E-SMLCSM Spatial MultiplexingSME Short Message EntitySMS Short Message ServiceSMSC Short Message Service CenterSNAP Subscriber, Network, Application, PolicySNS Social Networking SiteSOA Service-Oriented ArchitectureSON Self-Optimizing or Self-Organizing NetworkSORTD Spatial Orthogonal-Resource Transmit DiversitySPS Semi-Persistent SchedulingSPR Subscription Profile Repository

    SR/CQI/ACK Scheduling Request/Channel Quality Indicators/AcknowledgementSRIT Set of Radio Interface TechnologiesSRNS Serving Radio Network SubsystemSRS Sounding Reference SignalSrv ServerSRVCC Single Radio Voice Call ContinuityS-SCH Secondary Synchronization CodeSTBC Space-Time Block CodeSU-MIMO Single-User Multiple-Input Multiple-OutputSU-UL-MIMO Single-User Uplink Multiple-Input Multiple-OutputSWP Single Wireless ProtocolSYNC Short for SynchronizationTA Timing AdvanceTAI Tracking Area Identity

    TAS Transmit Antenna SwitchingTAU Target Acquisition and tracking UnitTB Transport BlocksTCP Transmission Control ProtocolTDD Time Division DuplexTDF Traffic Detection FunctionTD-LTE Time Division-Long Term Evolution or LTE TDDTDM Time Division MultiplexingTDS Time Domain Scheduling

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    TD-SCDMA Time Division-Spatial Code Division Multiple AccessTE-ID Tunnel Endpoint IdentifierTETRA Terrestrial Trunked RadioTF Transport FormatTISPAN Telecoms & Internet converged Services & Protocols for Advanced Networks, a

    standardization body of ETSITM Transparent ModeTMSI Temporary Mobile Subscriber IdentityTsp Reference point between the Service Capability Server (SCS) and Machine Type

    Communication Inter Working FunctionTP Transport ProtocolTPC Transmit Power ControlTRX TransceiverTS Technical SpecificationTSG-RAN TSG Radio Access Network is a specification group at 3GPPTSM Transport Synchronous ModuleTSMS Interface between the Short Message Entity and the Short Message Service CenterTSN Transmission Sequence Numbering

    TTI Transmission Time IntervalTx or TX TransmitTxD or TXD Transmit DiversityUCI Uplink Control InformationUDC Utility Data CenterUDR User Data RepositoryUE User EquipmentUGC User Generated ContentUICC A physically secure device, an Integrated Circuit Card (or Smart Card), that can be

    inserted and removed from the terminal. It may contain one or more applications. Oneof the applications may be a USIM

    UL UplinkUL-SCH Uplink Shared Channel

    UM Unacknowledged ModeUMA Unlicensed Mobile AccessUMB Ultra Mobile BroadbandUMD Ultra Mobile DeviceUMTS Universal Mobile Telecommunication System, also known as WCDMAUpPTS Uplink Pilot Time SlotURA_PCH UTRAN Registration Area_Paging ChannelURI Uniform Resource IdentifiersURN Uniform Resource NamesUSB Universal Serial BusUSB-IC Universal Serial Bus-Integrated CircuitUSAT USIM Application ToolkitUSIM Universal SIMUSSD Unstructured Supplementary Service Data

    UTC Universal Time CoordinatedUTRA Universal Terrestrial Radio AccessUTRAN UMTS Terrestrial Radio Access NetworkVAS Value-Added ServiceVCC Voice Call ContinuityVDSL Very-high-speed Digital Subscriber LineVLR Visitor Location RegisterVNI Visual Networking IndexVoHSPA Voice over HSPA

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    VoIP Voice over Internet ProtocolVoLTE Voice over LTEVPCRF Visiting PCRFVPLMN Visiting PLMNVPN Virtual Private Network

    vSRVCC Single Radio Video Call ContinuityWAP Wireless Application ProtocolWBC Wireless Broadband CoreWCDMA Wideband Code Division Multiple AccessWI Work ItemWi-Fi Wireless Internet or IEEE 802.11 standardsWIM Wireless Identity ModuleWiMAX Worldwide Interoperability for Microwave Access based on

    IEEE 802.16 standardWLAN Wireless Local Area NetworkWP Working PartyWRC World Radio ConferenceWTSC-G3GSN Wireless Technologies & Systems Committee-GSM/3G System and Network

    Subcommittee at ATISX2 Interface between eNBsxDSL Digital Subscriber LinexHTML Extensible Hypertext Markup LanguagexSON Extended Self-Optimizing/Self-Organizing Network