F
FA Full Allocation
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
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
FFS For Further Study
FFT Fast Fourier Transformation
FH Frequency Hopping
FLO Flexible Layer One
FM Fault Management
FMC Fixed Mobile Convergence
FN Frame Number
FNUR Fixed Network User Rate
FP Frame Protocol
FPLMN Forbidden PLMN
FR Full Rate
FRC Fixed Reference Channel
FTAM File Transfer Access and Management
ftn forwarded-to number
G
G-RNTI GERAN Radio Network Temporary Identity
GAGAN GPS Aided Geo Augmented Navigation
GBR Guaranteed Bit Rate
GC General Control (SAP)
GCR Group Call Register
GERAN GSM EDGE Radio Access Network
GGSN Gateway GPRS Support Node
GID1 Group Identifier (level 1)
GID2 Group Identifier (level 2)
GLONASS GLObal'naya NAvigatsionnaya Sputnikovaya Sistema (Engl.: Global Navigation Satellite System)
GMLC Gateway Mobile Location Centre
GMM GPRS Mobility Management
GMSC Gateway MSC
GMSK Gaussian Minimum Shift Keying
GNSS Global Navigation Satellite System
GP Guard Period
GPA GSM PLMN Area
GPRS General Packet Radio Service
GPS Global Positioning System
GRA GERAN Registration Area
GSA GSM System Area
GSIM GSM Service Identity Module
GSM Global System for Mobile communications
GSN GPRS Support Nodes
GT Global Title
GTP GPRS Tunneling Protocol
GTP-U GPRS Tunnelling Protocol for User Plane
GTT Global Text Telephony
GUMMEI Globally Unique MME Identifier
GUP 3GPP Generic User Profile
H
H-CSCF Home CSCF
HANDO Handover
HARQ Hybrid ARQ, Hybrid Automatic Repeat Request
HCS Hierarchical Cell Structure
HDLC High Level Data Link Control
HE Home Environment
HE-VASP Home Environment Value Added Service Provider
HF Human Factors
HFN HyperFrame Number
HHO Hard Handover
HLC High Layer Compatibility
HLR Home Location Register
HN Home Network
HO Handover
HOLD Call hold
HPLMN Home Public Land Mobile Network
HPS Handover Path Switching
HPU Hand Portable Unit
HR Half Rate
HRPD CDMA2000 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
I
I-Block Information Block
I-ETS Interim European Telecommunications Standard
I/O Input/Output
I Information frames (RLP)
IA Incoming Access (closed user group SS)
IAM Initial Address Message
IC Integrated Circuit
Interlock Code (CUG SS)
IC(pref) Interlock Code of the preferential CUG
ICB Incoming Calls Barred (within the 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
ICM In-Call Modification
ICMP Internet Control Message Protocol
ICS In-Channel Selectivity
ICT Incoming Call Timer
ID Identifier
IDFT Inverse Discrete Fourier Transform
IDL Interface Definition Language
IDN Integrated Digital Network
IDNNS Intra Domain NAS Node Selector
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
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
IHOSS Internet Hosted Octet Stream Service
IIOP Internet Inter-ORB Protocol
IK Integrity key
IM Intermodulation
IP Multimedia
IMA Inverse Multiplexing on ATM
IMC IMS Credentials
IMEI International Mobile Equipment Identity
IMGI International mobile group identity
IMPI IP Multimedia Private Identity
IMPU IP Multimedia PUblic identity
IMS IP Multimedia Subsystem
IMSI International Mobile Subscriber Identity
IMT-2000 International Mobile Telecommunications 2000
IMUN International Mobile User Number
IN Intelligent Network
Interrogating Node
INAP Intelligent Network Application Part
INF INFormation field
IoT Internet of Things
IP Internet Protocol
IP-CAN IP-Connectivity Access Network
IP-M IP Multicast
IPv4 Internet Protocol Version 4
IPv6 Internet Protocol Version 6
IR Infrared
IRP Integration Reference Point
IS Interface Specification
ISC International Switching Centre
ISCP Interference Signal Code Power
ISDN Integrated Services Digital Network
ISIM IM Services Identity Module
ISO International Organisation for Standardisation
ISP Internet Service Provider
ISUP ISDN User Part
IT Information Technology
ITC Information Transfer Capability
ITU International Telecommunication Union
ITU-R Radiocommunication Sector of the ITU
IUI International USIM Identifier
IUT Implementation Under Test
IWF InterWorking Function
I-WLAN Interworking WLAN
IWMSC InterWorking MSC
IWU Inter Working Unit
J
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
JTAPI Java Telephony Application Programming Interface
JVM Java™ Virtual Machine