# WTF, Telco?!
1xRTT - CDMA2000 1x Radio Transmission Technology
2G - 2nd Generation
3D - Three Dimensional
3G - 3rd Generation
3GPP - 3rd Generation Partnership Project
3GPP - Third Generation Partnership Project
3PTY - 3-ParTY conference
5G - Fifth Generation
5G-AN - 5G Access Network
5G-AV - 5G Authentication Vector
5G-HE-AV - 5G Home Environment Authentication Vector
5G-NSWO - 5G Non-Seamless WLAN Offload
5G-RG - 5G Residential Gateway
5G-SE-AV - 5G Serving Environment Authentication Vector
5GC - 5G Core Network
5GS - 5G System
5QI - 5G QoS Identifier
8-PSK - 8-state Phase Shift Keying
A-MPR - Additional Maximum Power Reduction
A-SGW - Access Signalling Gateway
A/S - Actuator/Sensor
A3 - Authentication algorithm A3
A38 - A single algorithm performing the functions of A3 and A8
A5/1 - Encryption algorithm A5/1
A5/2 - Encryption algorithm A5/2
A5/X - Encryption algorithm A5/0-7
A8 - Ciphering key generating algorithm A8
AAA - Authentication, Authorization, Accountability
AAA - Authentication, Authorization, and Accounting
AAL - ATM Adaptation Layer
AAL2 - ATM Adaptation Layer type 2
AAL5 - Adaptation Layer type 5
AAL5 - ATM Adaptation Layer type 5
AAU - Active Antenna Unit
AB - Access Burst
ABBA - Anti-Bidding down Between Architectures
ABNF - Augmented Backus-Naur Form
ABS - Almost Blank Subframe
AC - Application Context
AC - Authentication Centre
AC - Alternating Current
AC - Access Class (C0 to C15)
AC - Access Condition
ACC - Automatic Congestion Control
ACCH - Associated Control Channel
ACELP - Algebraic Code Excited Linear Prediction
ACIR - Adjacent Channel Interference Ratio
ACK - Acknowledgement
ACL - Access Control List
ACL - APN Control List
ACLR - Adjacent Channel Leakage Power Ratio
ACLR - Adjacent Channel Leakage Ratio
ACM - Accumulated Call Meter
ACM - Address Complete Message
ACMmax - ACM (Accumulated Call Meter) maximal value
ACR - Anonymous Communication Rejection
ACR-CB - Anonymous Call Rejection and Call Barring
ACRR - Adjacent Channel Rejection Ratio
ACS - Adjacent Channel Selectivity
ACS - Auto-Configuration Server
ACU - Antenna Combining Unit
AD - Access Delay
ADC - Administration Centre
ADC - Analogue to Digital Converter
ADCH - Associated Dedicated Channel
ADD - Automatic Device Detection
ADF - Application Dedicated File
ADM - Access condition to an EF which is under the control of the authority which creates this file
ADN - Abbreviated Dialling Numbers
ADPCM - Adaptive Differential Pulse Code Modulation
ADPCM - Adaptive Differential Pulse Coded Modulation
ADRF - Analytics Data Repository Function
ADSL - Asymmetric Digital Subscriber Line
AE - Application Entity
AEAD - Authenticated Encryption with Associated Data
AEC - Acoustic Echo Control
AEF - Additional Elementary Functions
AES - Advanced Encryption Standard
AESA - ATM End System Address
AF - Application Function
AF - Authentication Framework
AFC - Automatic Frequency Control
AGCF - Access Gateway Control Function
AGCH - Access Grant CHannel
AI - Artificial Intelligence
AI - Acquisition Indicator
Ai - Action indicator
AICH - Acquisition Indicator Channel
AID - Application IDentifier
AIUR - Air Interface User Rate
AK - Data Acknowledgement message
AK - Anonymity Key
AKA - Authentication and Key Agreement
AKI - Asymmetric Key Index
AKMA - Authentication and Key Management for Applications
ALCAP - Access Link Control Application Protocol
ALSI - Application Level Subscriber Identity
ALW - ALWays
AM - Acknowledged Mode
AMBR - Aggregate Maximum Bit Rate
AMF - Address Mapping Function
AMF - Authentication Management Field
AMF - Access and Mobility Management Function
AMI - Application Management Interface
AMN - Artificial Mains Network
AMR - Adaptive Multi Rate
AMR - Adaptative Multi-Rate
AMR-NB - Adaptive Multi Rate - NarrowBand
AMR-WB - Adaptive Multi Rate - Wide Band
AMR-WB - Adaptive Multi Rate Wide Band
AN - 5G Access Network
AN - Access Network
AN-PDB - 5G Access Network Packet Delay Budget
AnLF - Analytics Logical Function
ANM - ANswer Message
ANP - Access Network Provider
AoC - Advice of Charge
AoCC - Advice of Charge Charging
AoCI - Advice of Charge Information
AP - Access preamble
APC - Angled Physical Contact
APDU - Application Protocol Data Unit
API - Application Programming Interface
API - Application Program Interface
APN - Access Point Name
APN-AMBR - APN-Aggregate Maximum Bit Rate
APN-AMBR - APN Aggregate Maximum Bit Rate
APN-NI - Access Point Name Network Identifier
APN-NI - APN Network Identifier
APN-OI - Access Point Name Operator Identifier
AR - Augmented Reality
ARFCN - Absolute Radio Frequency Channel Number
ARP - Address Resolution Protocol
ARP - Allocation Retention Priority
ARPF - Authentication credential Repository and Processing Function
ARQ - Automatic Repeat ReQuest
ARQ - Automatic Repeat Request
ARR - Access Rule Reference
AS - Application Server
AS - Access Stratum
ASC - Access Service Class
ASCI - Advanced Speech Call Items
ASE - Application Service Element
ASME - Access Security Management Entity
ASN.1 - Abstract Syntax Notation One
ASP - Application Server Process
ASP - Application Service Provider
AT - ATtention Command
ATCF - Access Transfer Control Function
ATDT - ATtention Dial Tone
ATGW - Access Transfer Gateway
ATM - Asynchronous Transfer Mode
ATP - Access Transport Parameter
ATR - Answer To Reset
ATS - Abstract Test Suite
ATSSS - Access Traffic Steering, Switching, Splitting
ATSSS-LL - ATSSS Low-Layer
ATT - (flag) Attach
ATU-STI - Access Transfer Update – Session Transfer Identifier
AU - Access Unit
AuC - Authentication Centre
AUSF - Authentication Server Function
AUT(H) - Authentication
AUTN - Authentication token
AUTN - Authentication Token
AUTN - AUthentication TokeN
AV - Authentication Vector
AV' - transformed Authentication Vector
AVP - Attribute Value Pair
AWG - American Wire Gauge
AWGN - Additive White Gaussian Noise
B-ISDN - Broadband ISDN
B2BUA - Back-to-Back User Agent
BA - BCCH Allocation
BAIC - Barring of All Incoming Calls
BAOC - Barring of All Outgoing Calls
BAP - Backhaul Adaptation Protocol
BB - Backbone Bearer
BBU - Base Band Unit
BBU - BaseBand Unit
BC - Bearer Capability information element
BC - Band Category
BCALL - Basic CALL
BCC - Base Transceiver Station (BTS) Colour Code
BCCH - Broadcast Control Channel
BCD - Binary Coded Decimal
BCF - Base station Control Function
BCFE - Broadcast Control Functional Entity
BCH - Broadcast Channel
BCIE - Bearer Capability Information Element
BCM - Bearer Control Mode
BCS - Battery Control System
BCSM - Basic Call State Model
BCT - Broadcast and Communications Technology
BDN - Barred Dialling Number
Bearer - Service
BER - Basic Encoding Rules (of ASN.1)
BER - Bit Error Ratio
BFI - Bad Frame Indication
BG - Border Gateway
BGCF - Breakout Gateway Control Function
BGT - Block Guard Time
BH - Backhaul
BI - all Barring of Incoming call
BIC - Baseline Implementation Capabilities
BIC-Roam - Barring of Incoming Calls when Roaming outside the home PLMN country
BICC - Bearer Independent Call Control
BICC - Bearer Independant Call Control
BID - Binding Identity
BIDI - BIDIrectional
BLER - Block Error Rate
BLER - Block Error Ratio
Bm - Full-rate traffic channel
BMC - Broadcast/Multicast Control
BMCA - Best Master Clock Algorithm
BMS - Battery Management System
BN - Bit Number
BNA - Broad Network Access
BO - Broadcast Outlet
BO - all Barring of Outgoing call
BOC - Bell Operating Company
BOIC - Barring of Outgoing International Calls
BOIC-exHC - Barring of Outgoing International Calls except those directed to the Home PLMN Country
BOL - Begin-Of-Life
BPSK - Binary Phase Shift Keying
BRG - 5G Broadband Residential Gateway
BRID - Broadcast Remote Identification
BS - Base Station
BS - Basic Service (group)
BS - Bearer Service
BSC - Base Station Controller
BSF - Binding Support Function
BSG - Basic Service Group
BSIC - Base transceiver Station Identity Code
BSIC-NCELL - BSIC of an adjacent cell
BSR - Buffer Status Report
BSS - Business Support System
BSS - Base Station System
BSS - Base Station Subsystem
BSS - Base Station Sub-system
BSSAP - Base Station Subsystem Application Part
BSSAP - Base Station System Application Part
BSSAP+ - Base Station System Application Part +
BSSGP - Base Station Subsystem GPRS Protocol
BSSGP - Base Station System GPRS Protocol
BSSMAP - Base Station Subsystem Management Application Part
BSSOMAP - Base Station Subsystem Operation and Maintenance Application Part
BTFD - Blind Transport Format Detection
BTS - Base Transceiver Station
BVC - BSS GPRS Protocol Virtual Connection
BVCI - BSS GPRS Protocol Virtual Connection Identifier
BVCI - BSSGP Virtual Connection Identifier
BVLOS - Beyond Visual Line of Sight
BW - Bandwidth
BWP - Bandwidth Part
BWT - Block Waiting Time
C - Conditional
C- - Control-
C-APDU - Command APDU
C-MSISDN - Correlation MSISDN
C-plane - Control Plane
C-RAN - Centralized or Cloud RAN
C-RAN - Centralized Radio Access Network
C-RNTI - Cell RNTI as used in TS 36.331
C-RNTI - Cell Radio Network Temporary Identity
C-RNTI - Cell RNTI
C-TEID - Common Tunnel Endpoint IDentifier
C-TPDU - Command TPDU
C/I - Carrier-to-Interference Power Ratio
C/R - Command/Response field bit
C2 - Command and Control
CA - Capacity Allocation
CA - Cell Allocation
CA - Certification Authority
CA - Carrier Aggregation
CAA - Capacity Allocation Acknowledgement
CAD - Card Acceptance Device
CAG - Closed Access Group
CAI - Charge Advice Information
CAMEL - Customized Applications for Mobile network Enhanced Logic
CAMEL - Customised Application Mobile Enhanced Logic
CAMEL - Customised Application for Mobile network Enhanced Logic
CAP - CAMEL Application Part
CAP - Camel Application Part
CAPIF - Common API Framework for 3GPP northbound APIs
CATV - CAble TV
CAZAC - Constant Amplitude Zero Auto-Correlation
CB - Cell Broadcast
CB - Communication Barring
CBC - Cipher Block Chaining
CBC - Cell Broadcast Centre
CBCH - Cell Broadcast CHannel
CBMI - Cell Broadcast Message Identifier
CBR - Constant Bit Rate
CBS - Cell Broadcast Service
CC - Cryptographic Checksum
CC - Component Carrier
CC - Component Carriers
CC - Connection Confirm message
CC - Call Control
CC - Country Code
CC/PP - Composite Capability/Preference Profiles
CCA - Client Credentials Assertion
CCBS - Completion of Calls to Busy Subscriber
CCBS - Completion of Communications to Busy Subscriber
CCCB - Commands, Controls and Communications in Buildings
CCCH - Common Control Channel
CCE - Control Channel Element
CCF - Call Control Function
CCH - Control Channel
CCI - Capability / Configuration Identifier
CCITT - Comité Consultatif International Télégraphique et Téléphonique (The International Telegraph and Telephone Consultative Committee)
CCK - Corporate Control Key
CCM - Certificate Configuration Message
CCM - Current Call Meter
CCNR - Completion of Communications by No Reply
CCO - Cell Change Order
CCP - Capability/Configuration Parameter
CCPCH - Common Control Physical Channel
CCR - Call Completion Ratio
Cct - Circuit
CCTrCH - Coded Composite Transport Channel
CCU - Channel Codec Unit
CD - Capacity Deallocation
CD - Collision Detection
CD - Call Deflection
CD - Communication Deflection
CDA - Capacity Deallocation Acknowledgement
CDCH - Control-plane Dedicated CHannel
CDIV - Communication DIVersion
CDMA - Code Division Multiple Access
CDN - Coupling/Decoupling Network
CDP - Charging Determinating Point
CdPty - Called Party
CDR - Charging Data Record
CDR - Communication Data Record
CDR - Call Detail Record
CDUR - Chargeable DURation
CED - called station identifier
CEIR - Central Equipment Identity Register
Cell-ID - Cell Identity as used in TS 36.331
Cell-ID - Cell Identity as used in TS 38.331
CEND - end of charge point
CEPT - Conférence des administrations Européennes des Postes et Telecommunications
CF - Conversion Facility
CF - all Call Forwarding services
CFB - Call Forwarding on mobile subscriber Busy
CFB - Call Forwarding Busy
CFB - Communication Forwarding Busy
CFN - Connection Frame Number
CFNL - Communication Forwarding Not Logged in
CFNR - Call Forwarding No Response
CFNR - Communication Forwarding No Reply
CFNRc - Call Forwarding on mobile subscriber Not Reachable
CFNRy - Call Forwarding on No Reply
CFU - Call Forwarding Unconditional
CFU - Communication Forwarding Unconditional
CG - Carrier Group
CG - Cell Group
CGF - Charging Gateway Functionality
CGI - Common Gateway Interface
CGI - Cell Global Identifier
CGI - Cell Global Identification
CH - Credentials Holder
CHAP - Challenge Handshake Authentication Protocol
CHF - Charging Function
CHO - Conditional Handover
CHP - CHarging Point
CHV - Card Holder Verification information
CI - Cell Identity
CI - CUG index
CI - CUG Index
CIC - Circuit Identification Code
CID - Cell-ID (positioning method)
CIM - Common Information Model
CIMS - Cloud Infrastructure Management System
CIoT - Cellular IoT
CIoT - Cellular Internet of Things
cIPX - consumer's IPX
CIR - Carrier to Interference Ratio
CK - Cipher Key
CK-SRVCC - Cipher Key for Single Radio Voice Continuity
CKSN - Ciphering Key Sequence Number
CKSN - Cipher Key Sequence Number
CLA - CLAss
CLI - Calling Line Identity
CLIP - Calling Line Identification Presentation
CLIR - Calling Line Identification Restriction
CLK - Clock
CLNP - Connectionless network protocol
CLNS - Connectionless network service
CM - Connection Management
CMAS - Commercial Mobile Alert Service
CMC - Connection Mobility Control
CMD - Command
CMIP - Common Management Information Protocol
CMISE - Common Management Information Service
CMM - Channel Mode Modify
CMM - Circuit Mobility Management
CN - Core Network
CN - Comfort Noise
CN - Core Netwrok
CN-PDB - Core Network Packet Delay Budget
CNAP - Calling Name Presentation
CND - Customer Network Device
CNG - Calling Tone
CNG - Customer Network Gateway
CNL - Co-operative Network List
cNRF - consumer's NRF
CNTR - Counter
COLI - COnnected Line Identity
COLP - COnnected Line identification Presentation
COLR - COnnected Line identification Restriction
COM - COMplete
CONF - CONFerence (add-on)
CONF - CONFerence
CONNACK - Connect Acknowledgement
CONS - Connection-oriented network service
CORBA - Common Object Request Broker Architecture
COTS - Commercial-Off-The-Shelf
CP - Cyclic prefix
CP - Control Plane
CP-Admin - Certificate Present (in the MExE SIM)-Administrator
CP-TP - Certificate Present (in the MExE SIM)-Third Party
CPBCCH - COMPACT Packet BCCH
CPCH - Common Packet Channel
CPCS - Common Part Convergence Sublayer
CPE - Customer Premises Equipment
CPE - Customer Premise Equipment
CPE_X - Customer Premise Equipment for E-UTRA operating band X
CPG - Call Progress Message
CPICH - Common Pilot Channel
cPLMN - consumer's PLMN
CPRI - Common Public Radio Interface
CPS - Common Part Sublayer
CPU - Central Processing Unit
CQI - Channel Quality Indicator
CR - Connection Request message
CR - Completion Ratio
CR - Certificate Repository
CRC - Cyclic Redundancy Check
CRE - Call Ree-establishment procedure
CREF - Connection Refused message
CRF - Charging Rules Function
CRG - 5G Cable Residential Gateway
CRL - Certificate Revocation List
CRNC - Controlling Radio Network Controller
CS - Circuit Switched
CS - Coding Scheme
CS - Circuit-Switched
CS-GW - Circuit Switched Gateway
CSC - Communication Service Customer
CSCF - Call Session Control Function
CSCF - Call Server Control Function
CSD - Circuit Switched Data
CSE - Camel Service Environment
CSE - CAMEL Service Environment
cSEPP - consumer's SEPP
CSFB - Circuit Switched Fall Back
CSG - Closed Subscriber Group
CSGID - Closed Subscriber Group Identity
CSI - Channel State Information
CSP - Communication Service Provider
CSPDN - Circuit Switched Public Data Network
CSS - CSG Subscriber Server
CT - Call Transfer supplementary service
CT - Channel Tester
CT - Channel Type
CTCH - Common Traffic Channel
CTDMA - Code Time Division Multiple Access
CTFC - Calculated Transport Format Combination
CTM - Cellular Text telephone Modem
CTR - Common Technical Regulation
CTR - Counter (mode)
CTS - Cordless Telephony System
CU - Central Unit
CUG - Closed User Group
CW - Call Waiting
CW - Continuous Wave (unmodulated signal)
CW - Communication Waiting
CW - Continuous Wave
CWDM - Coarse Wavelength Division Multiplexing
CWI - Character Waiting Integer
CWT - Character Waiting Time
D-CSI - Dialled Services CAMEL Subscription Information
D-RAN - Distributed RAN
DAC - Digital to Analog Converter
DAD - Destination ADress
DAM - DECT Authentication Module
DAPS - Dual Active Protocol Stacks
DAS - Direct Attached Storage
DB - Data Base
DB - Dummy Burst
DC - Direct Current
DC - Dedicated Control (SAP)
DC - Dual Connectivity
DC-HSDPA - Dual Cell HSDPA
DCA - Dynamic Channel Allocation
DCCF - Data Collection Coordination Function
DCCH - Dedicated Control Channel
DCE - Data Circuit terminating Equipment
DCE - Data Circuit-terminating Equipment
DCF - Data Communication Function
DCH - Dedicated Channel
DCI - Downlink Control Information
DCK - Depersonalisation Control Key
DCN - Data Communication Network
DCN - Dedicated Core Network
DCS - Data Coding Scheme
DCS - Default Credentials Server
DCS1800 - Digital Cellular Network at 1800MHz
DDI - Direct Dial In
DDNMF - 5G Direct Discovery Name Management Function
DDoS - Distributed Denial of Service
DECT - Digital Enhanced Cordless Telecommunications
DeNB - Donor eNB
DES - Data Encryption Standard
DET - Detach
DF - Dedicated File
DF - Don't Fragment
DFB - Distributed FeedBack
DFT - Discrete Fourier Transformation
DHCP - Dynamic Host Configuration Protocol
DHO - Diversity Handover
diff-serv - Differentiated services
DiffServ - Differentiated Service
DIMM - Dual In-line Memory Module
DIP - Dominant Interferer Proportion
DISC - Disconnect
DIY - Do It Yourself
DL - Data Layer
DL - Downlink (Forward Link)
DL - Downlink
DL-SCH - Downlink Shared Channel
DL-SCH - Downlink Shared channel
DLCI - Data Link Connection Identifier
DLD - Data Link Discriminator
Dm - Control channel (ISDN terminology applied to mobile service)
DMR - Digital Mobile Radio
DMTF - Distributed Management Task Force
DN - Destination Network
DN - Data Network
DNAI - DN Access Identifier
DNIC - Data Network Identifier
DNN - Data Network Name
DNS - Domain Name System
DNS - Directory Name Service
DO - Data Object
DOD - Deep of Discharge
DoS - Denial of Service
DP - Dial Pulse
DP - Distribution Point
DP - Dial/Dialled Pulse
DP - Detection Point
DPC - Destination Point Code
DPCCH - Dedicated Physical Control Channel
DPCH - Dedicated Physical Channel
DPD - Dead Peer Detection
DPDCH - Dedicated Physical Data Channel
DQ - Data Quality
DRAC - Dynamic Resource Allocation Control
DRB - (user) Data Radio Bearer
DRB - Data Radio Bearer
DRMP - Diameter Routing Message Priority
DRNC - Drift Radio Network Controller
DRNS - Drift RNS
DRX - Discontinuous Reception
DS-CDMA - Direct-Sequence Code Division Multiple Access
DS-TT - Device-side TSN translator
DSAC - Domain Specific Access Control
DSCH - Downlink Shared Channel
DSCP - Differentiated Services Code Point
DSE - Data Switching Exchange
DSI - Digital Speech Interpolation
DSLAM - Digital Subscriber Line Access Multiplier
DSS1 - Digital Subscriber Signalling No1
DSS1 - Digital Subscriber Signalling 1
DT - Delivery Time
DT1 - Data Form 1 message
DT2 - Data Form 2 message
DTAP - Direct Transfer Application Part
DTCH - Dedicated Traffic Channel
DTE - Data Terminal Equipment
DTI - Direct Tunnel Indicator
DTI - Direct Tunnel Indication
DTM - Dual Transfer Mode
DTMF - Dual Tone Multiple Frequency
DTMF - Dual Tone Multi Frequency
DTN - Deflected To Number
DTT - Digital Terrestrial Television
DTX - Discontinuous Transmission
DU - Distributed Unit
DUT - Device Under Test
DVB - Digital Video Broadcasting
DVB-S - Digital Video Broadcasting - Satellite
DVB-T - Digital Video Broadcasting - Terrestrial
DWDM - Dense Wavelength Division Multiplexing
DwPTS - Downlink Pilot Timeslot
E-CID - Enhanced Cell-ID (positioning method)
E-CSCF - Emergency CSCF
E-GGSN - Enhanced GGSN
E-HLR - Enhanced HLR
E-RAB - E-UTRAN Radio Access Bearer
E-SMLC - Enhanced Serving Mobile Location Centre
E-SMLC - Evolved Serving Mobile Location Centre
E-TM - E-UTRA Test Model
E-UTRA - Evolved UTRA
E-UTRA - Evolved Universal Terrestrial Radio Access
E-UTRA - Evolved UMTS Terrestrial Radio Access
E-UTRA/5GC - E-UTRA connected to 5GC
E-UTRA/EPC - E-UTRA connected to EPC
E-UTRAN - Evolved UTRAN
E-UTRAN - Evolved Universal Terrestrial Radio Access Network
E2E - End to End
EA - Expedited Data Acknowledgement message
EA - External Alarms
EAC - Early Admission Control
EAP - Extensible Authentication Protocol
EARFCN - E-UTRA Absolute Radio Frequency Channel Number
EARFCN-DL - E-UTRA Absolute Radio Frequency Channel Number-Down Link
EATF - Emergency Access Transfer Function
EBI - EPS Bearer Identity
EBI - EPS Bearer ID
EBSG - Elementary Basic Service Group
EC-EGPRS - Extended Coverage EGPRS [deprecated: replaced by EC-GSM-IoT]
EC-GSM-IoT - Extended Coverage GSM Internet of Things
Ec/No - Ratio of energy per modulating bit to the noise spectral density
ECB - Electronic Code-book
ECC - Emergency Call Code
ECC - Elliptic Curve Cryptography
ECC - Error Correcting Code
ECEF - Earth Centred, Earth Fixed
ECGI - E-UTRAN Cell Global Identifier
ECI - Earth-Centered-Inertial
ECM - Error Correction Mode (facsimile)
ECM - EPS Connection Management
ECN - Explicit Congestion Notification
eCPRI - evolved Common Public Radio Interface
ECSD - Enhanced CSD
ECT - Explicit Call Transfer supplementary service
ECT - Explicit Call Transfer
ECT - Explicit Communication Transfer
ECTRA - European Committee of Telecommunications Regulatory Affairs
ED - Expedited Data message
EDC - Error Detection Code byte
EDGE - Enhanced Data rates for GSM Evolution
EDP - Event Detection Point
eDRX - Extended Discontinous Reception
EDT - Early Data Transmission
EEA - EPS Encryption Algorithm
eEEC - enhanced Ethernet Equipment Clock
EEL - Electric Echo Loss
EF - Elementary File (on the UICC)
EF - Elementary File
eFMSS - Enhancement to Flexible Mobile Service Steering
EFR - Enhanced Full Rate
EFS - Error free seconds
EGPRS - Enhanced GPRS
EHPLMN - Equivalent Home PLMN
EIA - EPS Integrity Algorithm
EIR - 5G-Equipment Identity Register
EIR - Equipment Identity Centre
EIR - Equipment Identity Register
EIRP - Equivalent Isotropic Radiated Power
EIRP - Effective Isotropic Radiated Power
eKSI - Key Set Identifier in E-UTRAN
eKSI - Key Set Identifier for E-UTRAN
EL - Echo Loss
EM - Element Manager
eMBB - enhanced Mobile BroadBand
EMC - ElectroMagnetic Compatibility
EMI - Electro Magnetic Interference
eMLPP - enhanced Multi-Level Precedence and Pre-emption
EMM - EPS Mobility Management
EMMI - Electrical Man Machine Interface
EMS - Element Management System
EMSK - Extended Master Session Key
EN-DC - E-UTRA-NR Dual Connectivity
EN-DC - E-UTRA NR Dual Connectivity
eNB - E-UTRAN Node B
eNB - evolved Node B
eNB - e NodeB (applies to LTE)
eNB - Evolved Node-B
eNodeB - E-UTRAN NodeB
eNodeB - Evolved Node B
ENSI - External Network Slice Information
ENTI - External Network Testing Interface
ENUM - Electronic NUMbering
ENUM - E.164 telephone NUmber Mapping
ENUM - Telephone Number Mapping
ENUM - E.164 Number Mapping
EOL - End-Of-Life
EOP - End of Optional Parameter
EP - Elementary Procedure
EPA - Extended Pedestrian A model
EPC - Enhanced Power Control
EPC - Evolved Packet Core
EPC - Evolved Packet Core Network
EPCCH - Enhanced Power Control Channel
ePDG - evolved Packet Data Gateway
ePDG - Evolved Packet Data Gateway
EPRE - Energy Per Resource Element
EPROM - Erasable Programmable Read Only Memory
ePRTC - enhanced Primary Reference Time Clock
EPS - Evolved Packet System
EPS-AV - EPS authentication vector
ERP - Equivalent Radiated Power
ERP - Ear Reference Point
ERR - Error
ERR - Protocol Data Unit Error message
ESD - Electrostatic discharge
ESM - EPS Session Management
ESP - Encapsulating Security Payload
ETFTN - Extended TFT Support Network
ETFTU - Extended TFT Support UE
ETNS - European Telecommunications Numbering Space
ETR - ETSI Technical Report
ETS - Emergency Telecommunication Service
ETS - European Telecommunication Standard
ETSI - European Telecommunications Standards Institute
etu - elementary time unit
ETU - Extended Typical Urban model
ETWS - Earthquake and Tsunami Warning System
EU - End Users
EUI - End-User Identity
EUI - Extended Unique Identifier
EUTRAN - Evolved UMTS Terrestrial Radio Access Network
EV - Electrical Vehicle
eV2X - Enhanced V2X
EVA - Extended Vehicular A model
EVM - Error Vector Magnitude
Ext - Extender
F-MMS - Fixed network MMS
F-MMSC - Fixed network MMSC
F-TEID - Fully Qualified Tunnel Endpoint Identifier
FA - Full Allocation
FA - Fax Adaptor
FAC - Final Assembly Code
FACCH - Fast Associated Control CHannel
FACCH/F - Fast Associated Control Channel/Full rate
FACCH/H - Fast Associated Control Channel/Half rate
FACH - Forward Access Channel
FAR - Forwarding Action Rule
FAUSCH - Fast Uplink Signalling Channel
FAX - Facsimile
FB - Frequency correction Burst
FBI - Feedback Information
FCC - Federal Communications Commission
FCCH - Frequency Correction CHannel
FCI - File Control Information
FCP - File Control Parameter
FCS - Frame Check Sequence
FDD - Frequency Division Duplex
FDM - Frequency Division Multiplex
FDMA - Frequency Division Multiple Access
FDN - Fixed Dialling Number
FDR - False transmit format Detection Ratio
FEC - Forward Error Correction
FER - Frame Erasure Rate, Frame Error Rate
FF - FEEDFACE.COM
FFS - For Further Study
FFT - Fast Fourier Transformation
FH - Frequency Hopping
FHM - Fronthaul Multiplexer
FLO - Flexible Layer One
FM - Fault Management
FMC - Fixed Mobile Convergence
FMSS - Flexible Mobile Service Steering
FMT - Fibre Management Tray
FN - Frame Number
FN-BRG - Fixed Network Broadband RG
FN-CRG - Fixed Network Cable RG
FN-RG - Fixed Network RG
FNUR - Fixed Network User Rate
FP - Frame Protocol
FPH - FreePHone service
FPLMN - Forbidden PLMN
FQDN - Fully Qualified Domain Name
FR - Full Rate
FRC - Fixed Reference Channel
FSAN - Full Service Access Network
FTAM - File Transfer Access & Management
FTAM - File Transfer Access and Management
FTM - Frame Tunnelling Mode
FTN - Forwarded To Number
ftn - forwarded-to number
FTTH - Fiber To The Home
FWA - Fixed Wireless Access
G-PDU - GTP-U non-signalling PDU
G-PDU - GTP encapsulated user Plane Data Unit
G-RNTI - GERAN Radio Network Temporary Identity
GAGAN - GPS Aided Geo Augmented Navigation
GBA - Generic Bootstrapping Architecture
GBR - Guaranteed Bit Rate
GBR - Gross Bit Rate
GC - General Control (SAP)
GCR - Group Call Register
GCSI - GPRS CAMEL Subscription Information indicator
GCSI - GPRS CAMEL Subscription Information
GEA - GPRS Encryption Algorithm
GEO - Geostationary Orbit
GERAN - GSM Edge Radio Access Network
GERAN - GSM EDGE Radio Access Network
GERAN - GSM/EDGE Radio Access Network
GFBR - Guaranteed Flow Bit Rate
GGSN - Gateway GPRS Support Node
GID1 - Group Identifier (level 1)
GID2 - Group Identifier (level 2)
GII - Global Information Infrastructure
GIN - Group ID for Network Selection
GL - Global Link
GLMS - Group and List Management Server
GLONASS - GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)
GM - 5G Grand Master
GMLC - Gateway Mobile Location Centre
GMLC - Gateway MLC
GMM - GPRS Mobility Management
GMM/SM - GPRS Mobility Management and Session Management
GMSC - Gateway MSC
GMSK - Gaussian Minimum Shift Keying
Gn - Interface between GPRS Support Nodes (GSNs) within a PLMN
gNB - NR Node B
gNB - g NodeB (applies to NR)
gNB - Next Generation Node-B
GND - GrouND
GNSS - Global Navigation Satellite System
GNSS - Global Navigation Satellite Systems
Gp - Interface between GPRS Support Nodes (GSNs) in different PLMNs
GP - Guard Period
GPA - GSM PLMN Area
GPON - Gigabit Passive Optical Network
GPRS - General Packet Radio Service
GPRS-CSI - GPRS CAMEL Subscription Information
GPRS-SSF - GPRS Service Switching Function
gprsSSF - GPRS Service Switching Function
GPS - Global Positioning System
GPSI - Generic Public Subscription Identifier
GRA - GERAN Registration Area
GRUU - Globally Routable User Agent URI
GRX/IPX - GPRS Roaming eXchange/IP eXchange
GSA - GSM System Area
GSIM - GSM Service Identity Module
GSM - Global System for Mobile communication
GSM - Global System for Mobile communications
GSM - Global System for Mobile Communications
GSM-SCF - GSM Service Control Function
gsmSCF - GSM Service Control Function
gsmSRF - GSM Specialised Resource Function
gsmSSF - GSM Service Switching Function
GSN - GPRS Support Nodes
GSN - GPRS Support Node
GT - Global Title
GTP - GPRS Tunneling Protocol
GTP - GPRS Tunnelling Protocol
GTP-C - GTP Control Plane
GTP-C - GTP Control
GTP-PDU - GTP-C PDU or GTP-U PDU
GTP-U - GPRS Tunnelling Protocol for User Plane
GTP-U - GTP User Plane
GTP-U - GTP User
GTPv2-C - GTP version 2, control plane
GTPv2-U - GTP version 2, user plane
GTT - Global Title Translation
GTT - Global Text Telephony
GTW - GaTeWay
GUAMI - Globally Unique AMF Identifier
GUMMEI - Globally Unique MME Identifier
GUP - 3GPP Generic User Profile
GUP - Generic User Profile
GUTI - Globally Unique Temporary Identity
GUTI - 5G Globally Unique Temporary Identifier
GUTI - Globally Unique Temporary Identifier
GUTI - Globally Unique Temporary UE Identity
GW - GateWay
GW - Gateway
GWCN - Gateway Core Network
H-CSCF - Home CSCF
HA - High Availability
HAN - Home Area Network
HANDO - Handover
HARQ - Hybrid Automatic Repeat Request
HARQ - Hybrid ARQ, Hybrid Automatic Repeat Request
HCS - Hierarchical Cell Structure
HD - Home Distributor
HD - Half-Duplex for Sidelink Operation
HD-FDD - Half- Duplex FDD
HDLC - High Level Data Link Control
HDMI - High Definition Multimedia Interface
HE - Home Environment
HE-VASP - Home Environment Value Added Service Provider
HeMS - Home eNodeB Management System
HeNB - Home eNodeB
HeNB-GW - Home eNodeB Gateway
HES - Hosted Enterprise Services
Hetnets - Heterogeneous network
HEVC - High Efficiency Video Coding
HF - Human Factors
HFN - HyperFrame Number
HFN - Hyper Frame Number
HG - Home Gateway
HGMLC - Home GMLC
HHO - Hard Handover
HLC - High Layer Compatibility
HLC - High Layer Compatibility information element
HLR - Home Location Register
HMS - Home NodeB Management System
HMTC - High-Performance Machine-Type Communications
HN - Home Network
HNB - Home Node B
HNB - Home NodeB
HNB-GW - Home NodeB Gateway
HNBGW - Home Node B Gateway
HO - Handover
HO - Hand Over
HOLD - communication HOLD
HOLD - Call hold
HP - Hosting Party
HPLMN - Home Public Land Mobile Network
HPLMN - Home PLMN
HPM - HP Module
HPMN - Home Public Mobile Network
HPS - Handover Path Switching
HPU - Hand Portable Unit
HR - Half Rate
HR - Home Routed (roaming)
HRES - Hash RESponse
HRPD - CDMA2000 High Rate Packet Data
HRPD - High Rate Packet Data
HRR - Handover Resource Reservation
HSCSD - High Speed Circuit Switched Data
HSDPA - High Speed Downlink Packet Access
HSN - Hopping Sequence Number
HSPA - High Speed Packet Access
HSS - Home Subscriber Server
HSUPA - High Speed Uplink Packet Access
HTTP - Hyper Text Transfer Protocol
HTTPS - Hyper Text Transfer Protocol Secure (https is http/1.1 over SSL, i.e. port 443)
HU - Home Units
HW - Hardware
HXRES - Hash eXpected RESponse
I - Information frames (RLP)
I-Block - Information Block
I-CSCF - Interrogating CSCF
I-CSCF - Interrogating-CSCF
I-ETS - Interim European Telecommunications Standard
I-SMF - Intermediate SMF
I-UPF - Intermediate UPF
I-WLAN - Interworking WLAN
I/O - Input/Output
IA - Incoming Access (closed user group SS)
IA - Incoming Access
IAB - Integrated access and backhaul
IAB - Integrated Access and Backhaul
IAB-MT - Integrated Access Backhaul -Mobile Termination
IAM - Initial Address Message
IANA - Internet Assigned Number Authority
IANA - Internet Assigned Numbers Authority
IARI - IMS Application Reference Identifier
IBCF - Interconnection Border Control Function
IBCF - Interconnect Border Control Function
IC - Integrated Circuit
IC - Interlock Code (CUG SS)
IC - Interconnection
IC(pref) - Interlock Code of the preferential CUG
ICB - Incoming Calls Barred (within the CUG)
ICB - Incoming Calls Barred within a CUG
ICC - Integrated Circuit Card
ICCID - Integrated Circuit Card Identification
ICD - Interface Control Document
ICGW - Incoming Call Gateway
ICI - Incoming Call Information
ICIC - Inter-Cell Interference Coordination
ICID - IM CN subsystem Charging Identifier
ICM - In-Call Modification
ICMP - Internet Control Message Protocol
ICP - Internet Content Provider
ICS - Implementation Conformance Statement
ICS - In-Channel Selectivity
ICSI - IMS Communication Service Identifier
ICT - Incoming Call Timer
ICT - Information and Communications Technology
ICT - Information Communication Telecommunication
ID - Identification
ID - IDentification
ID - Identifier
IDFT - Inverse Discrete Fourier Transform
IDL - Interface Definition Language
IDN - Integrated Digital Network
IDNNS - Intra Domain NAS Node Selector
IE - Information Element
IE - Information element
IEC - International Electrotechnical Commission
IED - Information Element Data
IEEE - Institute of Electrical and Electronics Engineers
IEI - Information Element Identifier
IEIDL - Information Element Identifier Data Length
IETF - Internet Engineering Task Force
IF - Infrastructure
IF - Information Flow
IFD - Interface Device
IFOM - IP FlOw Mobility
IFS - Information Field Sizes
IFSC - Information Field Size for the UICC
IFSD - Information Field Size for the Terminal
IGMP - Internet Group Management Protocol
IHOSS - Internet Hosted Octet Stream Service
II-NNI - Inter-IMS Network to Network Interface
IIOP - Internet Inter-ORB Protocol
IK - Integrity key
IK - Integrity Key
IK-SRVCC - Integrity Key for Single Radio Voice Continuity
IKE - Internet Key Exchange
IM - Intermodulation
IM - IP Multimedia
IMA - Inverse Multiplexing on ATM
IMC - IMS Credentials
IMCN - IP Multimedia Core Network
IMEI - International Mobile Equipment Identity
IMEI - International Mobile Station Equipment Identity
IMEI/TAC - IMEI Type Allocation Code
IMEISV - International Mobile Station Equipment Identity and Software Version number
IMGI - International mobile group identity
IMPI - IP Multimedia Private Identity
IMPU - IP Multimedia PUblic identity
IMS - IP Multimedia Subsystem
IMS - IP Multimedia core network Subsystem
IMS - IP Multimedia Core Network Subsystem
IMS-ALG - IMS Application Level Gateway
IMSI - International Mobile Subscriber Identity
IMSI - International Mobile Subscriber Identifier
IMT-2000 - International Mobile Telecommunications 2000
IMU - Inertial Measurement Unit
IMUN - International Mobile User Number
IN - Intelligent Network
IN - Interrogating Node
INAP - Intelligent Network Application Part
INF - INFormation field
IO - Input/Output
IOI - Inter Operator Identifier
IOMMU - Input/Output Memory Management Unit
IOPS - Isolated E-UTRAN Operation for Public Safety
IoT - Internet of Things
IP - Internet Protocol
IP - Intelligent Peripheral
IP-CAN - IP-Connectivity Access Network
IP-CAN - IP Connectivity Access Network
IP-M - IP Multicast
IP-SM-GW - IP Short Message Gateway
IPLMN - Interrogating PLMN
IPTV - Internet Protocol Television
IPTV - Internal Protocol TeleVision
IPUPS - Inter-PLMN UP Security
IPUPS - Inter PLMN UP Security
IPv4 - Internet Protocol Version 4
IPv4 - Internet Protocol version 4
IPv6 - Internet Protocol version 6
IPv6 - Internet Protocol Version 6
IPX - Internet Packet eXchange
IPX - IP exchange service
IR - Infrared
IRAT - Inter-Radio Access Technology
IRP - Integration Reference Point
IS - Information Security
IS - Interface Specification
ISC - International Switching Centre
ISCP - Interference Signal Code Power
ISDN - Integrated Services Digital Network
ISIM - IMS SIM
ISIM - IM Services Identity Module
ISIM - Inter-System Interface Mobility Management
ISMS - Information Security Management System
ISO - International Organisation for Standardisation
ISP - Internet Service Provider
ISR - Idle mode Signalling Reduction
ISR - Idle Mode Signaling Reduction
ISUP - ISDN User Part
IT - Information Technology
IT - Inactivity Test message
IT - Information Technologies
ITC - Information Transfer Capability
ITS - Intelligent Transportation Systems
ITU - International Telecommunication Union
ITU-R - Radiocommunication Sector of the ITU
IUI - International USIM Identifier
IUT - Implementation Under Test
IVR - Interactive V oice Response
IWF - InterWorking Function
IWF - Interworking Function
IWMSC - InterWorking MSC
IWU - Inter Working Unit
JAR - file Java Archive File
JCRE - Java Card™ Run Time Environment
JD - Joint Detection
JNDI - Java Naming Directory Interface
JP - Joint Predistortion
JPEG - Joint Photographic Experts Group
JPEG - Joint Photographic Expert Group
JTAPI - Java Telephony Application Programming Interface
JVM - Java™ Virtual Machine
K - Constraint length of the convolutional code
K - USIM Individual key
k - Windows size
kB - Kilobyte (1000 bytes)
kbps - kilo-bits per second
kbps - Kilobits per second
Kc - Ciphering key
KDF - Key Derivation Function
Ki - Individual subscriber authentication key
KPI - Key Performance Indicator
KSI - Key Set Identifier
KSI-SRVCC - Key Set Identifier for Single Radio Voice Continuity
ksps - kilo-symbols per second
L-GW - Local Gateway
L1 - Layer 1 (physical layer)
L1 - Layer 1
L2 - Layer 2 (data link layer)
L2 - Layer 2
L2ML - Layer 2 Management Link
L2R - Layer 2 Relay
L2R - BOP L2R Bit Orientated Protocol
L2R - COP L2R Character Orientated Protocol
L2TP - Layer-2 Tunnelling Protocol
L3 - Layer 3
L3 - Layer 3 (network layer)
LA - Location Area
LAC - Link Access Control
LAC - Location Area Code
LADN - Local Area Data Network
LAI - Location Area Identity
LAN - Local Area Network
LAN - 5G Local Area Network
LAN-VN - 5G LAN-Virtual Network
LAPB - Link Access Protocol Balanced
LAPDm - Link Access Protocol on the Dm channel
LATA - Local Access and Transport Area
LAU - Location Area Update
LB - Load Balancing
LBI - Linked EPS Bearer ID
LBO - Local Break Out
LBO - Local Break Out (roaming)
LC - Lucent Connector
LCD - Low Constrained Delay
LCG - Logical Channel Group
LCN - Local Communication Network
LCP - Link Control Protocol
LCR - Low Chip Rate
LCS - Location Services
LCS - LoCation Services
LCSC - LCS Client
LCSS - LCS Server
LD - Laser Diode
LDAP - Leightweight Directory Access Protocol
LDR - Location Deferred Request
LE - Local Exchange
LED - Light Emitting Diode
LEN - LENgth
LEO - Low Earth Orbit
LFP - Lithium Iron Phosphate
LGW - Local Gateway
LI - Lawful Intercept
LI - Language Indication
LI - Length Indicator
LI - Line Identity
LI - Lawful Interception
LIA - Location Information Answer
LiFi - Light Fidelity (wireless technology)
LIPA - Local IP Access
LIR - Location Information Request
LL-PDU - LLC PDU
LLC - Logical Link Control
LLC - Low Layer Compatibility
LLC - Low Layer Compatibility information element
LM - thnx luca! =)
Lm - Traffic channel with capacity lower than a Bm
LME - Level Management Entity
LMF - Location Management Function
LMI - Level Management Interface
LMSI - Local Mobile Station Identity
LMU - Location Measurement Unit
LN - Logical Name
LNA - Low Noise Amplifier
LNB - Low Noise Block
LND - Last Number Dialled
LNS - L2TP Network Server
LoA - Level of Automation
LoRa™ - Long Range (wireless technology)
LPC - Linear Predictive Coding
LPI - LCS Privacy Indicator
LPLMN - Local PLMN
LPP - LTE Positioning Protocol
LPPa - LTE Positioning Protocol Annex
LR - Location Register
LR - Location Registration
LRF - Location Retrieval Function
LSA - Localised Service Area
LSB - Least Significant Bit
LSM - Limited Service Mode
LSP - Label Switsch Path
LSTR - Listener SideTone Rating
LTE - Long Term Evolution
LTE - Local Terminal Emulator
LTE-M - Long Term Evolution for Machines
LTZ - Local Time Zone
LU - Logical Unit
LU - Local Units
LU - Location Update
LV - Low Voltage
LV - Length and Value
LVDC - Low Voltage Direct Current
LWA - LTE-WLAN Aggregation
LWIP - LTE WLAN RAN Level Integration using IPSec
M - Mandatory
M-CSI - Mobility Management event Notification CAMEL Subscription Information
M-TMSI - M-Temporary Mobile Subscriber Identity
M2M - Machine-to-Machine
M2PA - Message transfer part 2-User Peer-to-peer Adaptation layer
M2PA - MTP level 2 Peer-to-Peer Adaptation Layer
M2UA - Message transfer part 2 User Adaptation layer
M2UA - MTP level 2 User Adaptation Layer
M3UA - Message transfer part 3 User Adaptation layer
M3UA - MTP level 3 User Adaptation Layer
MA - Mobile Allocation
MA - Multiple Access
MAC - Media Access Control
MAC - Medium Access Control (protocol layering context)
MAC - Message authentication code (encryption context)
MAC - Medium Access Control
MAC-A - MAC used for authentication and key agreement (TSG T WG3 context)
MAC-I - MAC used for data integrity of signalling messages (TSG T WG3 context)
MAC-I - Message Authentication Code for Integrity (terminology of TS36.323)
MACF - Multiple Association Control Function
MACN - Mobile Allocation Channel Number
MACT - Message Authentication Code T used in AES CMAC calculation
MAF - Mobile Additional Function
MAH - Mobile Access Hunting supplementary service
MAHO - Mobile Assisted Handover
MAI - Mobile Allocation Index
MAIO - Mobile Allocation Index Offset
MAP - Mobile Application Part
MB-SMF - Multicast/Broadcast Session Management Function
MB-UPF - Multicast/Broadcast User Plane Function
MBB - Mobile BroadBand
MBMS - Multimedia Broadcast and Multicast Service
MBMS - MultiMedia Broadcast/Multicast Service
MBMS - Multimedia Broadcast/Multicast Service
Mbps - Megabits per second
MBR - Maximum BitRate
MBR - Maximum Bit Rate
MBS - Multicast/Broadcast Service
MBSF - Multicast/Broadcast Service Function
MBSFN - Multimedia Broadcast multicast service Single Frequency Network
MBSTF - Multicast/Broadcast Service Transport Function
MC - MediaConverters
MCC - Mobile Country Code
MCCH - Multicast Control Channel
MCE - Multi-cell/multicast Coordination Entity
MCG - Main Carrier Group
MCG - Master Cell Group
MCH - Multicast channel
MCI - Malicious Call Identification supplementary service
MCID - Malicious Call IDentification
MCID - Malicious Communication Identification
MCML - Multi-Class Multi-Link PPP
Mcps - Mega-chips per second
MCS - Modulation and Coding Scheme
MCS - Mission Critical Services
MCU - Media Control Unit
MCX - Mission Critical X, with X = PTT or X = Video or X = Data
MCX - Mission Critical Service
MD - Mediation Device
MDBV - Maximum Data Burst Volume
MDL - (mobile) Management (entity) - Data Link (layer)
MDS - Multimedia Distribution Service
MDT - Minimization of Drive Tests
ME - Maintenance Entity
ME - Mobile Equipment
MEC - Multi-access Edge Computing
MEF - Maintenance Entity Function
MEHO - Mobile evaluated handover
MEI - Mobile Equipment Identity
MeNB - Master eNB
MEO - Medium Earth Orbit
MER - Message Error Ratio
MExE - Mobile Execution Environment
MF - Master File
MF - MultiFrame
MF - Mobile Forwarding
MFAF - Messaging Framework Adaptor Function
MFBR - Maximum Flow Bit Rate
MGC - Media Gateway Controller
MGCF - Media Gateway Control Function
MGCP - Media Gateway Control Part
MGF - Media Gateway Function
MGT - Mobile Global Title
MGW - Media GateWay
MHEG - Multimedia and Hypermedia Information Coding Expert Group
MHS - Message Handling System
MIB - Management Information Base
MIB - Master Information Block
MIC - Mobile Interface Controller
MICO - Mobile Initiated Connection Only
MIM - Management Information Model
MIMO - Multi Input Multi Output
MIMO - Multiple Input Multiple Output
MIMO - Multiple Input-Multiple Output
MINT - Minimization of Service Interruption
MIoT - Massive Internet of Things
MIP - Mobile IP
MIPS - Million Instructions Per Second
MIS - Management Information Service
MITM - Man-in-the-Middle
ML - Machine Learning
MLC - Mobile Location Centre
MLD - Multicast Listener Discover
MM - Multimedia Message
MM - Man Machine
MM - Mobility Management
MM - Multimedia
MM4 - Interface between two MMS Relay/Server
MME - Mobility Management Entity
MME - Mobile Management Entity
MME-RN - MME serving the RN
MMEC - MME Code
MMI - Man Machine Interface
MMS - Multimedia Messaging Service
MMSC - Multimedia Messaging Service Centre
MMTEL - Multimedia Telephony
mmWave - millimetre Wave
mmWaves - millimetric Waves
MN - Master Node
MNC - Mobile Network Code
MNO - Mobile Network Operator
MNP - Mobile Number Portability
MNRF - Mobile station Not Reachable Flag
MNRG - Mobile station Not Reachable for GPRS flag
MNRR - Mobile station Not Reachable Reason
MO - Mobile Originated
MO - Mobile Originating
MO-EDT - Mobile Originated Early Data Transmission
MO-LR - Mobile Originating Location Request
MO-LR - Mobile Originated Location Request
MO-SMS - Mobile Originated Short Message Service
MOC - Mobile Originating Call
MOCN - Multi-Operator Core Network
MOHO - Mobile Originated Handover
MOP - Maximum Output Power
MOS - Mean Opinion Score
MoU - Memorandum of Understanding
MP - Multi-link PPP
MPEG - Moving Pictures Experts Group
MPH - (mobile) Management (entity) - PHysical (layer) [primitive]
MPLS - Multi Protocol Label Switching
MPPT - Maximum Power Point Tracking
MPR - Maximum Power Reduction
MPS - Multimedia Priority Service
MPTCP - Multi-Path TCP Protocol
MPTY - MultiParTY
MPV - Management Protocol Version
MR-DC - Multi-Radio Dual Connectivity
MRB - Media Resource Broker
MRF - Media Resource Function
MRFC - Multimedia Resource Function Controller
MRFP - Multimedia Resource Function Processor
MRP - Mouth Reference Point
MS - Measured Service
MS - Mobile Station
MS - Mobile Subscriber
MS - Multiformat Switch
MSA - MCH Subframe Allocation
MSB - Most Significant Bit
MSC - Mobile service Switching Centre
MSC - Mobile Switching Center
MSC - Mobile-services Switching Centre
MSC - Mobile Switching Centre
MSCM - Mobile Station Class Mark
MSCU - Mobile Station Control Unit
MSD - Maximum Sensitivity Degradation
MSE - MExE Service Environment
MSGin5G - Message Service Within the 5G System
MSI - MCH Scheduling Information
MSID - Mobile Station Identifier
MSIN - Mobile Station Identification Number
MSISDN - Mobile Station International ISDN number
MSISDN - Mobile Subscriber ISDN Number
MSK - Master Session Key
MSP - Multiple Subscriber Profile
MSR - Multi-Standard Radio
MSRN - Mobile Station Roaming Number
MSU - Message Signal Unit
MT - MTP Tester
MT - Mobile Terminated
MT - Mobile Termination
MT - Mobile Terminal
MT - Mobile Terminating in GMSC
MT-EDT - Mobile Terminated Early Data Transmission
MT-LR - Mobile Terminated Location Request
MT-LR - Mobile Terminating Location Request
MT-SMS - Mobile Terminated Short Message Service
MTBF - Mean Time Between Failures
MTBF - Mean Time Between Failure
MTC - Machine Type Communications
MTCH - Multicast Traffic Channel
MTLF - Model Training Logical Function
MTM - Mobile-To-Mobile (call)
MTP - Message Transfer Part
MTP2 - Message Transfer Part layer 2
MTP3 - Message Transfer Part layer 3
MTP3-B - Message Transfer Part level 3
MTTF - Mean Time To Failure
MTTR - Mean Time To Repair
MTU - Maximum Transmission Unit
MTU - Maximum Transfer Unit
MU - Mark Up
MUI - Mobile User Identifier
MUMS - Multi User Mobile Station
MVNO - Mobile Virtual Network Operator
MWD - Message Waiting Data
MWI - Message Waiting Indication
N-CSI - Network CAMEL Service Information
N-PDU - Network Protocol Data Unit
N/A - Not Applicable
N3IWF - Non-3GPP InterWorking Function
N3IWF - Non-3GPP access InterWorking Function
N5CW - Non-5G-Capable over WLAN
N5GC - Non-5G-Capable
NA - North American
NA - Network Access
NA-CS - Network Access Circuit switched
NA-PS - Network Access Packet switched
NACC - Network Assisted Cell Change
NACK - Negative Acknowledgement
NAD - Node Address byte
NAI - Network Access Identifier
NAPT - Network Address Port Translation
NAPT-PT - Network Address Port-Multiplexing Translation - Protocol Translation
NAS - Non-Access Stratum
NAS - Non Access Stratum
NAS - Network Attached Storage
NAS-MAC - Message Authentication Code for NAS for Integrity (called MAC in TS24.301)
NASDVM - Non Access Stratum - Data via MME
NASS - Network Attachment SubSystem
NAT - Network Address Translator
NAT - Network Address Translation
NAT-PT - Network Address Translation - Protocol Translation
NAT-T - NAT-Traversal
NB - Normal Burst
NB-IoT - Narrow Band Internet of Things
NBAP - Node B Application Part
NBIFOM - Network-based IP Flow Mobility
NBIN - A parameter in the hopping sequence
NCC - Network (PLMN) Colour Code
NCC - Next hop Chaining Counter
NCELL - Neighbouring (of current serving) Cell
NCH - Notification CHannel
NCK - Network Control Key
NCP - Network Control Protocol
NDC - National Destination Code
NDS - Network Domain Security
NDUB - Network Determined User Busy
NE - Network Element
NEA - Encryption Algorithm for 5G
NEBS - Network Equipment-Building System
NEF - Network Element Function
NEF - Network Exposure Function
NEHO - Network evaluated handover
NET - NETwork
NET - Norme Europeenne de Télécommunications
NEV - NEVer
NF - Network Function
NFV - Network Functions Virtualisation
NFV-MANO - Network Function Virtualisation Management and Orchestration
NFVI - Network Function Virtualisation Infrastructure
NFVI-PoP - Network Function Virtualisation Infrastructure Point of Presence
NFVO - Network Function Virtualisation Orchestrator
NG - Next Generation
ng-eNB - Next Generation Evolved Node-B
NG-RAN - 5G Radio Access Network
NGAF - Non-GPRS Alert Flag
NGAP - Next Generation Application Protocol
NGCN - Next Generation Corporate Network
ngKSI - Key Set Identifier in 5G
NGMN - Next Generation Mobile Networks
NGN - Next Generation Networks
NGN - Next Generation Network
NH - Next Hop
NI-LR - Network Induced Location Request
NIA - Integrity Algorithm for 5G
NIC - Network Interface Card
NIC - Network Independent Clocking
NIC-ID - Network Interface Card Identifier
NID - Network identifier
NIST - National Institute of Standards and Technology
NIT - Network Integration Testing
NITZ - Network Identity and Time Zone
NM - Network Manager
NMC - Network Management Centre
NMO - Network Mode of Operation
NMR - Network Measurement Results
NMS - Network Management Subsystem
NMSI - National Mobile Station Identifier
NNA - Network Non Accessibility
NNI - Network Node Interface
NNI - Network-Node Interface
NNI - Network to Network Interface
NO - Network Operator
NOP - Network Operator
NP - Network Performance
NP - Number portability
NPA - Numbering Plan Area
NPAC - Number Portability Administration Center
NPI - Numbering Plan Identifier
NPN - Non-Public Network
NR - New Radio
NR-DC - NR-NR Dual Connectivity
NR/5GC - NR connected to 5GC
NRF - Network Repository Function
NRI - Network Resource Identifier
NRID - Networked Remote Identification
NRM - Network Resource Model
NRSN - Network Request Support Network
NRSN - Network Requested Support Network
NRSU - Network Request Support UE
NRT - Non-Real Time
NS - Network Service
NSaaS - Network Slice as a Service
NSaasC - Network Slice as a Service Customer
NSaaSP - Network Slice as a Service Provider
NSAC - Network Slice Admission Control
NSACF - Network Slice Admission Control Function
NSAG - Network Slice AS Group
NSAP - Network Service Access Point
NSAPI - Network Service Access Point Identifier
NSAPI - Network layer Service Access Point Identifier
NSC - Network Slice Customer
NSCK - Network Subset Control Key
NSD - Network Service Descriptor
NSDU - Network Service Data Unit
NSDU - Network service data unit
NSI-ID - ID Network Slice Instance Identifier
NSP - Network Service Platform
NSP - Network Slice Provider
NSS - Network SubSystem
NSS - Network Sub System
NSSAA - Network Slice-Specific Authentication and Authorization
NSSAA - Network Slice Specific Authentication and Authorization
NSSAAF - Network Slice-specific and SNPN Authentication and Authorization Function
NSSAI - Network Slice Selection Assistance Information
NSSF - Network Slice Selection Function
NSSP - Network Slice Selection Policy
NSSRG - Network Slice Simultaneous Registration Group
NSWO - 5G Non-Seamless WLAN offload
NSWO - Non-Seamless WLAN offload
NSWO - Non-Seamless WLAN Offload
NSWOF - Non-Seamless WLAN offload Function
NSWOF - Non-Seamless WLAN Offload Function
NT - Non Transparent
NT - Network Termination
Nt - Notification (SAP)
NTAAB - New Type Approval Advisory Board
NTDD - Narrow-band Time Division Duplexing
NTP - Network Time Protocol
NUA - Network User Access
NUI - National User / USIM Identifier
NUI - Network User Identification
NUP - National User Part (SS7)
NW - Network
NW-TT - Network-side TSN translator
NWDAF - Network Data Analytics Function
O - Optional
O&M - Operations & Maintenance
O-BCSM - Originating Basic Call State Model
O-CSI - Originating CAMEL Subscription Information
O-DU - O-RAN Distributed Unit
O-RU - O-RAN Radio Unit
OA - Outgoing Access (CUG SS)
OACSU - Off-Air-Call-Set-Up
OAM - Operation, Administration, and Management
OCB - Outgoing Calls Barred within the CUG
OCB - Outgoing Calls Barred within a CUG
OCCCH - ODMA Common Control Channel
OCF - Open Card Framework
OCI - Outgoing Call Information
OCNG - OFDMA Channel Noise Generator
OCNS - Orthogonal Channel Noise Simulator
OCS - Online Charging System
OCSP - Online Certificate Status Protocol
OCT - Outgoing Call Timer
OD - Optional for operators to implement for their aim
ODB - Operator Determined Barring
ODCCH - ODMA Dedicated Control Channel
ODCH - ODMA Dedicated Channel
ODMA - Opportunity Driven Multiple Access
ODTCH - ODMA Dedicated Traffic Channel
OFCS - Offline Charging System
OFDM - Orthogonal Frequency Division Multiplex
OFDM - Orthogonal Frequency Division Multiplexing
OFDMA - Orthogonal Frequency Division Multiple Access
OFE - Optical FrontEnd
OFM - Operational Feature Monitor
OI - Operational Issues
OID - Object Identifier
OIP - Originating Identification Presentation
OIR - Originating Identification presentation Restriction
OLR - Overall Loudness Rating
OMA - Open Mobile Alliance
OMAP - Operations, Management and Administration Part
OMASE - OMAP ASE
OMC - Operation and Maintenance Centre
OML - Operations and Maintenance Link
OMR - Optimal Media Routeing
ON-SNPN - Onboarding Standalone Non-Public Network
ONN - Onboarding Network
ONP - Open Network Provision
ONT - Optical Network termination
OOB - Out-of-band
OPC - Originating Point Code
OPC - Origin PC
OPLMN - Operator Controlled PLMN (Selector List)
OR - Optimal Routeing
ORACH - ODMA Random Access CHannel
ORLCF - Optimal Routeing for Late Call Forwarding
OS - Optical Splitter
OS - Operating System
OS - Operations System
OSA - Open Service Access
OSA - Open Services Architecture
OSF - Operations Systems Function
OSI - Open System Interconnection
OSI - Open Systems Interconnection
OSI - RM OSI Reference Model
OSP - Octet Stream Protocol
OSP:IHOSS - Octet Stream Protocol for Internet Hosted Octet Stream Service
OSS - Operation Support System
OSS - Operator Specific Service
OTA - Over-The-Air
OTA - Over the Air
OTA - Over-The-Air (update of UICCs)
OTDOA - Observed Time Difference Of Arrival (positioning method)
OTDOA - Observed Time Delay Of Arrival
OTO - Optical Telecommunication Outlet
OTP - One Time Password
OTT - Over The Top
OVL - OVer-Load point
OVSF - Orthogonal Variable Spreading Factor
P-CCPCH - Primary Common Control Physical Channel
P-CPIH - Primary Common Pilot Channel
P-CSCF - Proxy CSCF
P-CSCF - Proxy-CSCF
P-CSCF - Proxy-Call Session Control Function
P-GRUU - Public Globally Routable User Agent URI
P-GW - PDN Gateway
P-MPR - Power Management Maximum Power Reduction
P-RNTI - Paging RNTI
P-TMSI - Packet TMSI
P-TMSI - Packet- Temporary Mobile Subscriber Identity
P2P - Point-to-Point
PA - Power Amplifier
PAA - PDN Address Allocation
PABX - Private Automatic Branch Exchange
PABX - Private Automatic Branch eXchange
PACCH - Packet Associated Control Channel
PAD - Packet Assember/Disassembler
PAGCH - Packet Access Grant Channel
PAP - Password Authentication Protocol
PAPR - Peak-to-Average Power Ratio
PAR - Peak to Average Ratio
PASP - Public Answering Safety Point
PAV - Power Available Value
PB - Pass Band
PBCCH - Packet Broadcast Control Channel
PBCH - Physical Broadcast Channel
PBID - PhoneBook IDentifier
PBP - Paging Block Periodicity
PBX - Private Branch eXchange
PC - Personal Computer
PC - Preferential CUG
PC - Physical Contact
PC - Point Code
PC - Power Control
PCB - Protocol Control Byte
PCC - Policy and Charging Control
PCC - Primary Component Carrier
PCCC - Parallel Concatenated Convolutional Code
PCCCH - Packet Common Control Channel
PCCH - Paging Control Channel
PCDE - Peak Code Domain Error
PCEF - Policy and Charging Enforcement Function
PCell - Primary Cell
PCF - Policy Control Function
PCFICH - Physical control format indicator channel
PCG - Project Co-ordination Group
PCH - Paging Channel
PCI - Peripheral Component Interconnect
PCI - Physical Cell Identity as used in TS 36.331
PCK - Personalisation Control Key
PCM - Pulse Code Modulation
PCMA - Pulse-Code-Modulation- A law
PCMCIA - Personal Computer Memory Card International Association
PCMU - Pulse Code Modulation μ -law
PCO - Protocol Configuration Options
PCPCH - Physical Common Packet Channel
PCRF - Policy and Charging Rules Function
PCRF - Policy and Charging Rule Function
PCS - Personal Communication System
PCU - Packet Control Unit
PD - Protocol Discriminator
PD - Public Data
PD - Photo Diode
PDB - Packet Delay Budget
PDCCH - Physical Downlink Control Channel
PDCH - Packet Data Channel
PDCH - Packet Data CHannel
PDCP - Packet Data Convergence Protocol
PDD - Post Dial Delay
PDF - Policy Decision Function
PDH - Plesiochronous Digital Hierarchy
PDN - GW Packet Data Network Gateway
PDN - Packet Data Network or Public Data Network
PDN - Public Data Network
PDN - Packet Data Network
PDN-GW - Packet Data Network Gateway
PDP - Packet Data Protocol
PDP - Packet Data Protocol, e.g. IP
PDP - Packet Data Protocol e.g., IP
PDR - Packet Detection Rule
PDSCH - Physical Downlink Shared Channel
PDTCH - Packet Data Traffic Channel
PDU - Packet Data Unit
PDU - Protocol Data Unit
PEI - Permanent Equipment Identifier
PER - Packet Error Rate
PESQ - Perceptual Evaluation of Speech Quality
PF - PerFluorinated
PFD - Packet Flow Description
PG - Processing Gain
PGW - Packet Data Network Gateway
PGW - Packet GateWay
PGW - PDN Gateway
PH - Packet Handler
PH - PHysical (layer)
PHF - Packet Handler Function
PHI - Packet Handler Interface
PHICH - Physical hybrid-ARQ indicator channel
PHS - Personal Handyphone System
PHY - Physical layer
PhyCH - Physical Channel
PI - Physical Infrastructure
PI - Page Indicator
PI - Presentation Indicator
PIAFS - PHS Internet Access Forum Standard
PIC - Point In Call
PICH - Page Indicator Channel
PICS - Protocol Implementation Conformance Statement
PID - Packet Identification
PIN - Personal Identification Number
PIN - Positive Intrinsic Negative
pIPX - producer's IPX
PIXIT - Protocol Implementation eXtra Information for Testing
PIXT - Protocol Implementation eXtra information for Testing
PKCS - Public-Key Cryptography Standards
PKI - Public Key Infrastructure
PL - Preferred Languages
PL - Permanent Link
PLMN - Public Land Mobile Network
PMCH - Physical Multicast Channel
PMD - Physical Media Dependent
PMD - Pseudonym mediation device functionality
PMI - Precoding Matrix Indicator
PMM - Packet Mobility Management
PN - Power Node
PN - Pseudo Noise
PNE - Présentation des Normes Européennes
PNF - Physical Network Function
PNI-NPN - Public Network Integrated Non-Public Network
PNP - Private Numbering Plan
pNRF - producer's NRF
PoE - Power over Ethernet
POF - Plastic Optical Fibre
POI - Privacy Override Indicator
POI - Point Of Interconnection (with PSTN)
PON - Passive Optical Network
PoP - Point of Presence
POP - Proof Of Possession
PoR - Proof of Receipt
POTS - Plain Old Telephony Service
PP - Point-to-Point
PPCH - Packet Paging Channel
PPD - Paging Policy Differentiation
PPE - Primative Procedure Entity
PPF - Paging Proceed Flag
PPI - Paging Policy Indicator
pPLMN - producer's PLMN
PPM - Parts Per Million
PPP - Point-to-Point Protocol
PPP - Point to Point Protocol
PPS - Protocol and Parameter Select (response to the ATR)
PRACH - Physical Random Access Channel
PRACH - Packet Random Access Channel
PRACK - Provisional Response Acknowledgement
PRB - Physical Resource Block
PRC - Primary Reference Clock
Pref - CUG Preferential CUG
PRINS - PRotocol for N32 INterconnect Security
PRNG - Pseudo Random Number Generator
ProSe - Proximity-based Services
PRS - Positioning Reference Signal
PS - Power Splitter
PS - Packet Switched
PS - Location Probability
PS - Packed Switched (sic)
PSA - PDU Session Anchor
PSAP - Public Safety Answering Point
PSBCH - Physical Sidelink Broadcast CHannel
PSC - Primary Synchronisation Code
PSC - Packet Scheduling
PSCCH - Physical Sidelink Control CHannel
PSCell - Primary SCG Cell
PSCH - Physical Shared Channel
PSD - Packet Switched Data
PSDCH - Physical Sidelink Discovery CHannel
PSE - Personal Service Environment
pSEPP - producer's SEPP
PSI - Public Service Identity
PSK - Pre-Shared Key
PSK - Pre-shared Key
PSM - Power Saving Mode
PSPDN - Packet Switched Public Data Network
PSS - Primary Synchronization Signal
PSSCH - Physical Sidelink Shared CHannel
PSSS - Primary Sidelink Synchronization Signal
PSS_RA - PSS-to-RS EPRE ratio for the channel PSS
PSTN - Public Switched Telecommunications Networks
PSTN - Public Switched Telephone Network
PSU - Power Supply Unit
PTAG - Primary Timing Advance Group
PTCCH - Packet Timing advance Control Channel
PTI - Procedure Transaction Identity
PTI - Procedure Transaction Id
PTM - Point-to-Multipoint
PTM-G - PTM Group Call
PTM-M - PTM Multicast
PtMP - Point to MultiPoint
PTP - Point to point
PTP - Precision Time Protocol
PTP - Point To Point
PtP - Point to Point
PTU - Power Transmitter Unit
PU - Payload Unit
PUCCH - Physical Uplink Control Channel
PUCT - Price per Unit Currency Table
PUESBINE - Provision of User Equipment Specific Behaviour Information to Network Entities
PUK - PIN Unblocking Key
PUR - Preconfigured Uplink Resource
PUSCH - Physical Uplink Shared Channel
PV - PhotoVoltaic
PVC - PolyVinyl Chloride
PVC - Permanent Virtual Circuit
PVS - Provisioning Server
PW - Pass Word
PWS - Public Warning System
QA - Q (Interface) - Adapter
QAF - Q - Adapter Function
QAM - Quadrature Amplitude Modulation
QCELP - Qualcomm Code-Excited Linear Prediction
QCI - QoS Class Identifier
QCIF - Quarter Common Intermediate Format
QFI - QoS Flow Identifier
QoE - Quality of Experience
QoS - Quality of Service
QPSK - Quadrature (Quaternary) Phase Shift Keying
QZSS - Quasi-Zenith Satellite System
R - Value of Reduction of the MS transmitted RF power relative to the maximum allowed output power of the highest power class of MS (A)
R-APDU - Response APDU
R-Block - Receive-ready Block
R-NNI - Roaming Network to Network Interface
R-PDCCH - Relay Physical Downlink Control Channel
R-SGW - Roaming Signalling Gateway
R-TPDU - Response TPDU
R99 - Release 1999
RA - Routing Area
RA - Random mode request information field
RA - Routeing Area
RA - Registration Authority
RA-RNTI - Random Access RNTI
RAB - Radio Access Bearer
RAB - Random Access Burst
RAC - Routing Area Code
RAC - Routeing Area Code
RACH - Random Access Channel
RACS - Radio Capabilities Signalling optimisation
RACS - Resource and Admission Control Subsystem
RADIUS - Remote Authentication Dial In User Service
RAI - Routing Area Identity
RAI - Routeing Area Identity
RAID - Redundant Array of Inexpensive/Independent Disks
RAN - Radio Access Network
RANAP - Radio Access Network Application Part
RANAP - Radio Access Network Application Protocol
RAND - RANDom number (used for authentication)
RAND - RANDom number
RAS - Reliability, Availability, and Serviceability
RAT - Radio Access Technology
RAU - Routing Area Update
RAU - Routeing Area Update
RB - Radio Bearer
RBC - Radio Bearer Control
RBER - Residual Bit Error Ratio
RCAF - RAN Congestion Awareness Function
RDF - Resource Description Format
RDI - Restricted Digital Information
RE - Rapid Elasticity
RE - Resource Element
REC - RECommendation
REFSENS - Reference Sensitivity power level
REG - Resource Element Group
REJ - REJect(ion)
REL - RELease
Rel-4 - Release 4
Rel-5 - Release 5
REN - Renewable ENergy
REQ - REQuest
RES - user RESponse
RES - 64-bit signed RESponse that is the output of the function f2 in a 3G AKA
RES - RESponse
RET - Remote Electrical Tilting
RETAP - Remote Electrical Tilting Application Part
RF - Radio Frequency
RF - radio frequency
RFC - Request For Comments
RFC - Radio Frequency Channel
RFC - Request for Comments
RFCH - Radio Frequency CHannel
RFE - Routing Functional Identity
RFN - Reduced TDMA Frame Number
RFT-C - Remote Feeding Telecommunication - Current limited
RFT-V - Remote Feeding Telecommunication - Voltage limited
RFU - Reserved for Future Use
RG - 5G Residential Gateway
RG - Residential Gateway
RI - Rank Indication
RID - Remote Identification
RIM - Remote Interference Management
RIM - RAN Information Management
RL - Radio Link
RL - Return Loss
RLC - Release Complete message
RLC - Radio Link Control
RLCP - Radio Link Control Protocol
RLOS - Restricted Local Operator Services
RLP - Radio Link Protocol
RLR - Receiver Loudness Rating
RLS - Radio Link Set
RLSD - Released message
RMS - Root Mean Square (value)
rms - Root Mean Square
RN - Relay Node
RNA - RAN-based Notification Area
RNC - Radio Network Controller
RNL - Radio Network Layer
RNS - Radio Network Subsystem
RNSAP - Radio Network Subsystem Application Part
RNTABLE - Table of 128 integers in the hopping sequence
RNTI - Radio Network Temporary Identity
RNTI - Radio Network Temporary Identifier
RoF - Radio over Fibre
ROHC - Robust Header Compression
RoHS - Restriction of the Use of Certain Hazardous Substances
RP - Resource Pooling
RP - Relay layer Protocol
RP-MTI - RP Message Type Indicator
RP-SMEA - RP SME-Address
RP-UI - RP User Information
RPLMN - Registered Public Land Mobile Network
RPOA - Recognised Private Operating Agency
RQA - Reflective QoS Attribute
RQI - Reflective QoS Indication
RR - Radio Resources
RRC - Radio Resource Control
RRH - Remote Radio Head
RRM - Radio Resource Management
RRU - Remote Radio Unit
RS - Reference Symbol
RS - Reference Signal
RSA - Rivest Shamir Adleman (public key asymmetric cryptosystem)
RSA - Algorithm invented by Rivest, Adleman and Shamir
RSC - Reset Confirm message
RSCP - Received Signal Code Power
RSE - Radio System Entity
RSL - Radio Signalling Link
RSN - Redundancy Sequence Number
RSR - Reset Request message
RSRQ - Reference Signal Received Quality
RSSI - Received Signal Strength Indicator
RST - Reset
RSTD - Reference Signal Time Difference
RSTP - Rapid Spanning Tree Protocol
RSVP - Resource ReserVation Protocol
RSZI - Regional Subscription Zone Identity
RT - Real Time
RTCP - Real Time Control Protocol
RTE - Remote Terminal Emulator
RTP - Real Time Protocol
RU - Resource Unit
RUCI - RAN User Plane Congestion Information
RWB - Resolution Bandwidth
RX - Receive
RX - Receiver
RXLEV - Received signal level
RXQUAL - Received Signal Quality
S-Block - Supervisory Block
S-CCPCH - Secondary Common Control Physical Channel
S-CPICH - Secondary Common Pilot Channel
S-CSCF - Serving CSCF
S-CSCF - Serving-CSCF
S-GW - Serving Gateway
S-GW - Signalling Gateway
S-NSSAI - Single Network Slice Selection Assistance Information
S-RNTI - SRNC Radio Network Temporary Identity
S-TMSI - SAE Temporary Mobile Station Identifier
S-TMSI - 5G S-Temporary Mobile Subscription Identifier
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
SA - Service Availability
SA - Service Access
SA - Security Association
SA-NR - Standalone New Radio
SA-T - Service Accessibility-Telephony
SAAL - Signalling ATM Adaptation Layer
SABM - Set Asynchronous Balanced Mode
SACCH - Slow Associated Control Channel
SACCH/C4 - Slow Associated Control CHannel/SDCCH/4
SACCH/C8 - Slow Associated Control CHannel/SDCCH/8
SACCH/T - Slow Associated Control CHannel/Traffic channel
SACCH/TF - Slow Associated Control CHannel/Traffic channel Full rate
SACCH/TH - Slow Associated Control CHannel/Traffic channel Half rate
SAD - Source Address
SAE - System Architecture Evolution
SAN - Storage Area Network
SAP - Service Access Point
SAPI - Service Access Point Identifier
SAR - Segmentation and Reassembly
SAT - SIM Application Toolkit
SB - Synchronization Burst
SBA - Service Based Architecture
SBAS - Space Based Augmentation System
SBI - Service Based Interface
SBLP - Service Based Local Policy
SBSC - Serving Base Station Controller
SBSS - Serving Base Station Subsystem
SBSS - Serving BSS
SC - Service Centre (used for SMS)
SC - Service Code
SC - Subscriber Connector
SC-FDMA - Single-Carrier Frequency Division Multiple Access
SCC - Secondary Component Carrier
SCC-AS - Service Centralization and Continuity AS
SCCH - Synchronisation Control Channel
SCCP - Signalling Connection Control Part
SCEF - Service Capability Exposure Function
SCell - Secondary Cell
SCF - Service Control Function (IN context), Service Capability Feature (VHE/OSA context)
SCF - Service Control Function
SCG - Secondary Cell Group
SCG - Secondary Carrier Group
SCH - Synchronisation Channel
SCI - Subscriber Controlled Input
SCN - Sub-Channel Number
SCN - Switched Circuit Network
SCP - Service Control Point
SCP - Service Communication Proxy
SCS - System Conformance Statement
SCS - Service Capability Server
SCTP - Stream Control Transmission Protocol
SCTP - S Common Transport Protocol
SCUDIF - Service Change and UDI/RDI Fallback
SD - Slice Differentiator
SDCCH - Stand-Alone Dedicated Control Channel
SDF - Service Data Flow
SDH - Synchronous Digital Hierarchy
SDL - Specification Description Language
SDMA - Spatial Division Multiple Access
SDN - Software Defined Networking
SDN - Service Dialling Number
SDP - Session Description Protocol
SDP - Service Discovery Protocol (Bluetooth related)
SDT - SDL Development Tool
SDU - Service Data Unit
SE - Security Environment
SE - Sending Entity
SE - Support Entity
SEAF - Security Anchor Functionality
SEAF - SEcurity Anchor Function
SEE - Site Energy Efficiency
SEES - Service Exposure and Enablement S
SEF - Support Entity Function
SEF - Subscriber Entrance Facilities
SEG - Security Gateway
SeGW - Security Gateway
SELV - Safety Extra Low Voltage
SeNB - Secondary eNB
SEP - Signalling End Point
SEPP - Security Edge Protection Proxy
SET - SUPL Enabled Terminal
SF - Spreading Factor
SFH - Slow Frequency Hopping
SFI - Short EF Identifier
SFN - System Frame Number
SFP - Small Form-factor Pluggable
SFTD - SFN and Frame Timing Difference
SG - Signalling Gateway
SgNB - Secondary gNB
SGSN - Serving GPRS Support Node
SGW - Serving Gateway
SHCCH - Shared Channel Control Channel
SI - Service Indicator
SI - Screening Indicator
SI - Service Interworking
SI - Supplementary Information (SIA = Supplemenatary Information A)
SI - System Information
SI-RNTI - System Information RNTI
SIB - System Information Block
SIC - Service Implementation Capabilities
SID - SIlence Descriptor
SIDF - Subscription Identifier De-concealing Function
SIGTRAN - Signalling Transport (group of the IETF)
SIGTRAN - SIGnalling TRANsport
SIM - GSM Subscriber Identity Module
SIM - Subscriber Identification Module
SIM - Subscriber Identity Module
SINR - Signal-to-Interference-and-Noise Ratio
SIO - SIOctet
SIP - Session Initiation Protocol
SIP - Session Initiated Protocol
SIP-I - Session Initiation Protocol - ISUP (SIP with encapsulated ISUP)
SIPTO - Selected IP Traffic Offload
SIR - Signal-to-Interference Ratio
SLA - Service Level Agreement
SLF - Subscription Locator Function
SLP - SUPL Location Platform
SLPI - Service Logic Program Instance
SLPP - Subscriber LCS Privacy Profile
SLR - Send Loudness Rating
SLS - Signalling Link Selection (field)
SLS - Service Level Specification
SLTM - Signalling Link Test Message
SM - Single Mode
SM - Session Management
SM - Short Message
SM-RL - Short Message Relay Layer
SM-SC - Short Message service Service Centre
SMC - Short Message Centre
SMC - Security Mode Command
SMDS - Switched Multimegabit Data Service
SME - Short Message Entity
SMF - Service Management Function
SMF - Session Management Function
SMG - Special Mobile Group
SMI - Structure of Management Information (RFC 1155)
SMLC - Serving Mobile Location Centre
SMLC - Serving MLC
SMO - Service Management and Orchestration
SMS - Short Messaging Service
SMS - Short Message Service
SMS-CB - SMS Cell Broadcast
SMS-CSI - Short Message Service CAMEL Subscription Information
SMS-GMSC - Gateway MSC for SMS
SMS-GMSC - Short Message Service Gateway MSC
SMS-IWMSC - Short Message Service Interworking MSC
SMS-IWMSC - Interworking MSC for SMS
SMS-PP - Short Message Service/Point-to-Point
SMS-SC - Short Message Service - Service Centre
SMSC - Short Message Service Centre
SMSF - Short Message Service Function
SMSI - System Management Service Interface
SMSMI - SMS without MSISDN in IMS
Smt - Short message terminal
SN - Secondary Node
SN - Serial Number
SN - Serving Network
SN - Sequence Number
SN - Subscriber Number
SN-id - Serving Network identity
SN-Id - Serving Network Identifier
SN-PDU - SNDCP PDU
SNDC - SubNetwork Dependent Convergence
SNDCP - Sub-Network Dependent Convergence Protocol
SNDCP - SubNetwork Dependent Convergence Protocol
SNMP - Simple Network Management Protocol
SNPN - Stand-alone Non-Public Network
SNR - Serial NumbeR
SNR - Signal-to-Noise Ratio
SO-SNPN - Subscription Owner Standalone Non-Public Network
SOA - Suppress Outgoing Access (CUG SS)
SOC - Status Of Charge
SOG - Subsystem Out Of Service Grant message
SOH - Status Of Health
SoLSA - Support of Localised Service Area
SON - Self Organizing Networks
SOR - Subsystem Out Of Service Request message
SoR - Steering of Roaming
SP - Service Provider
SP - Switching Point
SPC - Signalling Point Code
SPC - Suppress Preferential CUG
SPC - Stored Program Control
SpCell - Special Cell
SPCK - Service Provider Control Key
SPI - Security Parameters Indication
SPI - Security Parameter Index
SPID - Subscriber Profile ID for RAT/Frequency Priority
SpQ - Speech Quality
SPR - Subscriber Profile Repository
SQL - Structured Query Language
SQM - Service Quality Metrics
SQN - Sequence number
SQN - Sequence Number
SR - Scheduling Request
SR-IOV - Single Root I/O Virtualisation
SRB - Signalling Radio Bearer
SRB - Source Route Bridge
SRES - Signed RESponse (authentication value returned by the SIM or by the USIM in 2G AKA)
SRNC - Serving RNC
SRNC - Serving Radio Network Controller
SRNS - Serving RNS
SRP - SCCP Relay Point
SRS - Sounding Reference Signal
SRVCC - Single Radio Voice Call Continuity
SS - SubSystem
SS - Supplementary Service
SS - System Simulator
SS-CSI - Supplementary Service Notification CAMEL Subscription Information
SS7 - Signalling System No.7
SS7 - Signalling System #7
SS7 - Signalling System No. 7
SS7 - Signalling System 7
SSA - Subsystem Allowed message
SSB - Synchronization Signal Block
SSC - Secondary Synchronisation Code
SSC - Supplementary Service Control string
SSC - Session and Service Continuity
SSCF - Service Specific Co-ordination Function
SSCF-NNI - Service Specific Coordination Function – Network Node Interface
SSCMSP - Session and Service Continuity Mode
SSCOP - Service Specific Connection Oriented Protocol
SSCS - Service Specific Convergence Sublayer
SSDT - Site Selection Diversity Transmission
SSE - Service Specific Entities
SSF - Service Switching Function
SSN - SubSystem Number
SSN - Subsystem Number
SSN - Sub-System Number
SSP - Subsystem Prohibited message
SSP - Session Service Provider
SSS - Secondary Synchronization Signal
SSSAR - Service Specific Segmentation and Re-assembly sublayer
SSSS - Secondary Sidelink Synchronization Signal
SSS_RA - SSS-to-RS EPRE ratio for the channel
SST - Subsystem Status Test message
SST - Slice/Service Type
SST - Selection Policy Slice/Service Type
ST - SCCP Tester
ST - Setup Time
ST-T - Setup Time Telephony
STB - Set Top Box
STC - Signalling Transport Converter
STMR - SideTone Masking Rating
STN-SR - Session Transfer Number – Single Radio
STN-SR - Session Transfer Number for SRVCC
STP - Signalling Transfer Point
STTD - Space Time Transmit Diversity
SU - Signal Unit
SUA - Signalling connection control part User Adaptation layer
SUA - SCCP User Adaptation Layer
SUB - SUBaddressing
SUCI - Subscription Concealed Identifier
SuM - Subscription Management
SUPI - Subscription Permanent Identifier
SUPL - Secure User Plane Location
SUT - System Under Test
SV - Space Vehicle
SV - Software Version
SVC - Switched virtual circuit
SVN - Software Version Number
SW - Software
SW - Status Word
SW1/SW2 - Status Word 1/Status Word 2
SWB - Super Wide Band
SYNCE - Synchronous Ethernet
T - Timer
T - Transparent
T - Type only
T-BC - Telecom Boundary Clock
T-BCSM - Terminating Basic Call State Model
T-CSI - Terminating CAMEL Subscription Information
T-CSI - Terminating CAMEL Subscription Information (in the GMSC)
T-GM - Telecom Grand Master
T-GRUU - Temporary Globally Routable User Agent URI
T-PDU - Transport PDU
T-SGW - Transport Signalling Gateway
TA - Tracking Area
TA - Terminal Adaptor
TA - Terminal Adaptation
TA - Timing Advance
TAC - Type Approval Code
TAC - Tracking Area Code
TAF - Terminal Adaptation Function
TAG - Timing Advance Group
TAI - Tracking Area Identity
TAR - Toolkit Application Reference
TAS - Telephony Application Server
TAU - Tracking Area Update
TB - Transport Block
TBD - To Be Defined
TBF - Temporary Block Flow
TBR - Technical Basis for Regulation
TC - TransCoder
TC - Transmission Convergence
TC - Transaction Capabilities
TC-TR - Technical Committee Technical Report
TCAP - Transaction Capabilities Application Part
TCH - Traffic Channel
TCH/F - A full rate TCH
TCH/F2,4 - A full rate data TCH (≤2,4kbit/s)
TCH/F4,8 - A full rate date TCH (4,8kbit/s)
TCH/F9,6 - A full rate data TCH (9,6kbit/s)
TCH/FS - A full rate Speech TCH
TCH/H - A half rate TCH
TCH/H2,4 - A half rate data TCH (≤2,4kbit/s)
TCH/H4,8 - A half rate data TCH (4,8kbit/s)
TCH/HS - A half rate Speech TCH
TCI - Transceiver Control Interface
TCP - Transmission Control Protocol
TD-CDMA - Time Division-Code Division Multiple Access
TDD - Time Division Duplex
TDD - Time Division Duplex(ing)
TDM - Time Division Multiplex
TDMA - Time Division Multiple Access
TDMA - Time division multiple access
TDoc - Temporary Document
TDP - Trigger Detection Point
TE - Terminal Equipment
TE9 - Terminal Equipment 9 (ETSI sub-technical committee)
Tei - Terminal endpoint identifier
TEID - Tunnel End Point Identifier
TEID - Tunnel Endpoint IDentifier
TEID - Tunnel Endpoint Identifier
TEID-C - Tunnel Endpoint Identifier, control plane
TEID-U - Tunnel Endpoint Identifier, user plane
Temporary - Flow Identity
TF - Transformation Function
TF - Transport Format
TFA - TransFer Allowed
TFC - Transport Format Combination
TFCI - Transport Format Combination Indicator
TFCS - Transport Format Combination Set
TFI - Transport Format Indicator
TFIN - Transport Format INdicator
TFP - TransFer Prohibited
TFS - Transport Format Set
TFT - Traffic Flow Template
THIG - Topology Hiding Inter-network Gateway
TI - Transaction Identifier
TIF-CSI - Translation Information Flag
TIN - Temporary Identity used in Next update
TIP - Terminating Identification Presentation
TIPHON - Telecommunication and Internet Protocol Harmonization over Networks
TIR - Terminating Identification Restriction
TLIV - Type Length Instance Value
TLLI - Temporary Logical Link Identity
TLM - TeLeMetry word
TLS - Transport Layer Security
TLV - Tag Length Value
TM - Telecom Management
TM - Transparent Mode
TMA - Tower Mounted Amplifier
TMAAP - Tower Mounted Amplifier application part
TMF - Telecom Management Forum
TMF - Management Task Force
TMN - Telecom Management Network
TMN - Telecommunications Management Network
TMSI - Temporary Mobile Subscriber Identity
TN - Termination Node
TN - Timeslot Number
TN - Transport Network
TNAN - Trusted Non-3GPP Access Network
TNAP - Trusted Non-3GPP Access Point
TNGF - Trusted Non-3GPP Gateway Function
TNL - Transport Network Layer
TNLA - Transport Network Layer Association
TO - Telecom Operations Map
TO - Telecommunications Outlet
TOA - Time of Arrival
TOM - Tunnelling Of Messages
TON - Type Of Number
TOS - Type Of Service
TOS - Type of Service
TP - Third Party
TP - Terminal Portability
TP - Test Plant
TP - Test Purpose
TPAE - Third Party Authorized Entity
TPC - Transmit Power Control
TPDU - Transfer Protocol Data Unit
TR - Technical Report
TRAU - Transcoder and Rate Adaptor Unit
TRAU - Transcoder and Rate Adapter Unit
TrCH - Transport Channel
TrE - Trusted Environment
TRF - Transit and Roaming Function
TRFO - Transcoder free operation
TrGW - Transition Gateway
TRX - Transceiver
TS - Technical Specification
TS - Teleservice
TS - Time Slot
TSC - Training Sequence Code
TSC - Time Sensitive Communication
TSCAI - TSC Assistance Information
TSCTSF - Time Sensitive Communication and Time Synchronization Function
TSDI - Transceiver Speech & Data Interface
TSG - Technical Specification Group
TSN - Time Sensitive Networking
TSN-GM - TSN Grand Master
TSP - Telcommunication Service Provider
TSP - Traffic Steering Policy
TSP - Transport Service Provider
TSS - Test Suite Structure
TSS&TP - Test Suite Structure and Test Purposes
TSTD - Time Switched Transmit Diversity
TT - TC Test responder
TT - TSN Translator
TTCN - TTCN-2 or TTCN-3
TTCN-2 - Tree and Tabular Combined Notation version 2
TTCN-3 - Testing and Test Control Notation version 3
TTFF - Time To First Fix
TTI - Transmission Timing Interval
TTM - Time To Market
TUP - Telephony User Part
TUP - Telephone User Part (SS7)
TUP - Telephone User Part (of Signalling System No.7)
TV - TeleVision
TV - Television
TV - Type and Value
TWAN - Trusted WLAN Access Network
TWAP - Trusted WLAN Access Point
TWIF - Trusted WLAN Interworking Function
TX - Transmit
TX - Tranceiver
TXPWR - Transmit PoWeR; Tx power level in the MS_TXPWR_REQUEST and MS_TXPWR_CONF parameters
U-CSI - USSD CAMEL Subscription Information
U-plane - User plane
U-RNTI - UTRAN Radio Network Temporary Identity
UA - User Agent
UAC - User Agent Client
UARFCN - UTRA Absolute Radio Frequency Channel Number
UARFN - UTRA Absolute Radio Frequency Number
UART - Universal Asynchronous Receiver and Transmitter
UAS - User Agent Server
UAS - Uncrewed Aerial System
UAV - Uncrewed Aerial Vehicle
UAV - Unmanned Aerial Vehicle
UCMF - UE radio Capability Management Function
UCS2 - Universal Character Set 2
UD - Unrestricted Digital information
UDCH - User-plane Dedicated CHannel
UDD - Unconstrained Delay Data
UDI - Unrestricted Digital Information
UDM - Unified Data Management
UDP - User Datagram Protocol
UDR - Unified Data Repository
UDSF - Unstructured Data Storage Function
UDT - UnitData message
UDTS - UnitData Service message
UDUB - User Determined User Busy
UE - User Equipment
UE-AMBR - UE-Aggregate Maximum Bit Rate
UEA - UMTS Encryption Algorithm
UEM - operating band Unwanted Emissions Mask
UER - User Equipment with ODMA relay operation enabled
UESBI-Iu - UE Specific Behaviour Information - Iu
UESBI-Uu - UE Specific Behaviour Information - Uu
UG-CSI - USSD General CAMEL Service Information
UHD - Ultra High Definition
UHF - Ultra High Frequency
UI - User Interface
UI - Unnumbered Information (Frame)
UIA - 3G Integrity Algorithm
UIA - UMTS Integrity Algorithm
UIC - Union Internationale des Chemins de Fer
UICC - Universal Integrated Circuit Card
UL - Uplink
UL - Uplink (Reverse Link)
UL-CL - Uplink Classifier
UL-MIMO - Up Link Multiple Antenna transmission
UL-SCH - Uplink Shared channel
ULI - User Location Information
ULR - Update Location Request
UM - Unacknowledged Mode
UML - Unified Modelling Language
UMS - User Mobility Server
UMSC - UMTS Mobile Services Switching Centre
UMTS - Universal Mobile Telecommunications System
UMTS - Universal Mobile Telecommunication System
UNI - User-Network Interface
UNI - User Network Interface
UP - User Plane
UPCMI - Uniform PCM Interface (13-bit)
UPD - Up to date
UPE - User Plane Entity
UPF - User Plane Function
UpPTS - Uplink Pilot Timeslot
UPS - Uninterruptable Power System
UPT - Universal Personal Telecommunication
UPU - User Part Unavailable
URA - User Registration Area
URA - UTRAN Registration Area
URAN - UMTS Radio Access Network
URB - User Radio Bearer
URI - Uniform Resource Identifier
URI - Uniform Resource Identifie
URL - Universal Resource Locator
URL - Uniform Resource Locator
URLLC - Ultra Reliable Low Latency Communication
URLLC - Ultra-Reliable and Low Latency Communications
URLLC - Ultra Reliable Low Latency Communication Support
URN - Uniform Resource Name
URPP-SGSN - User Reachability Request Parameter for SGSN
URRP-AMF - UE Reachability Request Parameter for AMF
URRP-MME - User Reachability Request Parameter for MME
URRP-SGSN - UE Reachability Request Parameter for SGSN
URSP - UE Route Selection Policy
US - United States
USAT - USIM Application Toolkit
USB - Universal Serial Bus
USC - UE Service Capabilities
USCH - Uplink Shared Channel
USF - Uplink State Flag
USIM - Universal Subscriber Identity Module
USIM - User Service Identity Module
USIM - UMTS SIM
USS - UAS Service Supplier
USSD - Unstructured Supplementary Service Data
UT - Universal Time
UTM - Uncrewed Aerial System Traffic Management
UTP5 - Unshielded Twisted Pair (Category 5)
UTRA - Universal Terrestrial Radio Access
UTRA - UMTS Terrestrial Radio Access
UTRAN - Universal Terrestrial Radio Access Network
UTRAN - UMTS Terrestrial Radio Access Network
UUAA - USS UAV Authorization/Authentication
UUI - User-to-User Information
UUID - Universal Unique Identifier
UUS - User-to-User Signalling
UUS - The User-to-User Signalling supplementary service
UUS - Uu Stratum
UUS1 - UUS service 1
UUS2 - UUS service 2
UUS3 - UUS service 3
UV - UltraViolet
UWB - Ultra-Wide Band
V - Value only
V(SD) - Send state variable
V-RAN - Virtual Radio Access Network
V2X - Vehicle to Everything
VA - Voice Activity factor
VAC - Voltage Alternating Current
VAD - Voice Activity Detection
VAP - Videotex Access Point
VASP - Value Added Service Provider
VBR - Variable Bit Rate
VBS - Voice Broadcast Service
VC - Virtual Circuit
VCO - Voltage-Controlled Oscillator
VCSEL - Vertical Cavity Surface Emitting Laser
VDC - Voltage Direct Current
VDU - Virtualisation Deployment Unit
VGCS - Voice Group Call Service
VGMLC - Visited GMLC
VGW - Voice GateWay
VHE - Virtual Home Environment
VID - VLAN Identifier
VIM - Virtualised Infrastructure Manager
VLAN - Virtual Local Area Network
VLR - Visitor Location Register
VM - Virtual Machine
VMSC - Visited MSC
VN - Virtualisation
VN - 5G Virtual Network
VNF - Virtualised Network Function
VNF-EMS - Virtualised Network Function Element Management System
VNF-FG - VNF Forwarding Graph
VNFC - Virtualised Network Function Component
VNFD - Virtualised Network Function Descriptor
VNFM - Virtualised Network Function Manager
VoIP - Voice over IP
VoIP - Voice Over IP
VoLTE - Voice over LTE
VoPS - IMS Voice over PS session
VPI/VCI - Virtual Path/Virtual Channel Combination
VPLMN - Visited PLMN
VPLMN - Visited Public Land Mobile Network
VPMN - Visited Public Mobile Network
VPN - Virtual Private Network
VR - Virtual Reality
VRB - Virtual Resource Block
VS - Virtual Storage
VSC - Videotex Service Centre
VT - Mobile Terminating in VMSC
VT-CSI - VMSC Terminating CAMEL Subscription Information
VTX - host The components dedicated to Videotex service
W-5GAN - Wireline 5G Access Network
W-5GBAN - Wireline BBF Access Network
W-5GCAN - Wireline 5G Cable Access Network
W-AGF - Wireline Access Gateway Function
WA - Wide Area
WAAS - Wide Area Augmentation System
WAE - Wireless Application Environment
WAF - Web Application Firewall
WAN - Wide Area Network
WAP - Wireless Application Protocol
WBEM - Web Based Enterprise Management
WCDMA - Wideband Code Division Multiple Access
WDM - Wavelength Division Multiplexing
WDP - Wireless Datagram Protocol
WG - Working Group
WGR - WAP Get Request
WGS-84 - World Geodetic System 1984
WiFi - Wireless Fidelity (wireless technology)
WIM - Wireless Identity Module
WIN - Wireless Intelligent Network
WLAN - Wireless Local Area Network
WLAN - UE WLAN User Equipment
WPA - Wrong Password Attempts (counter)
WS - Work Station
WSP - Wireless Session Protocol
WT - WLAN Termination as used in TS 36.300
WTA - Wireless Telephony Applications
WTAI - Wireless Telephony Applications Interface
WTDD - Wideband Time Division Duplexing
WTLS - Wireless Transport Layer Security
WTP - Wireless Transaction Protocol
WTX - Waiting Time eXtenstion
WWT - Work Waiting Time
WWW - World Wide Web
X2-C - X2-Control plane
X2-U - X2-User plane
XCAP - eXtended Camel Application Part
XID - eXchange IDentifier
XMAC - exXpected Message Authentication Code (calculated by the USIM application in 3G AKA)
XML - eXtensible Markup Language
XRES - EXpected user RESponse
XRES - Expected Response
XRES - eXpected RESponse
XUDT - Extended UnitData message
XUDTS - Extended UnitData Service message
ZC - Zone Code
ZMRDB - Zentrale Master Routing-DatenBank (central master routing database)