Some acronyms from telecommunication world (but not only)

# A B C D E F G H I J K L M N O P Q R S T U W X V Y Z

3GPP has its own list of terms - [21.905]


3GPP - 3rd Generation Partnership Project


AAA - Authentication Authorization Accounting
AAL - ATM Adaptation Layer
AMR - Adaptive Multi Rate
AS - Application Server


BSC - Base Station Controler
BGCF - Breakout Gateway Control Function
BICC - Bearer Independent Call Control
BTS - Base Transceiver Station
BSS - Base Station Subsystem


CC - Call Control
CDMA - Code Division Multiple Access
CSCF - Call Session Control Function
CSFB - Circuit Switch Fallback
CM - Connection Management
CS - Circuit Switched
CQI - Channel Quality Indicator
CSI - Channel State Information


DCH - Dedicated Channel
DCI - Downlink Control Information


EUL - Enhanced Uplink
E-DCH - Enhanced Dedicated Channel
EDGE - Enhanced Data rates for GSM Evolution
EPC - Evolved Packet Core
EPS - Evolved Packet System


FDD - Frequency Division Duplex
FDMA - Frequency Divsion Multiple Access


GERAN - GSM/EDGE Radio Access Network
GGSN - Gateway GPRS Supporting Node
GMSC - Gateway Mobile Switching Center
GPRS - General Packet Radio Service
GSM - Global System for Mobile Telecommunication
GTP - GPRS Tunneling Protocol


HARQ - Hybrid Automatic rePeat Request
HLR - Home Location Register
HSCSD - High Speed Circuit Switched Data
HSPA - High Speed Packet Access
HSS - Home Subscriber System


IAM - Initial Address Message
I-CSCF - Interrogating Call Session Control Function
ICT - Information and communications technology
IMS - IP Multimedia Subsystem
IMSI - International Mobile Subscriber Identity
IP - Internet Protocol
ISDN - Integrated Services Digital Network
ISR - Idle mode Signalling Reduction
ISUP - ISDN User Part
ITU - International Telecommunication Union


LA - Location Area
LAA - License Assisted Access
LAU - Location Area Update
LTE - Long Term Evolution


MSC - Mobile Switching Center
MIMO - Multiple Input Multiple Output
MISO - Multiple Input Single Output
MGCF - Media Gateway Control Function
MGW - Media GateWay
MO - Mobile Originated
MME - Mobility Management Entity
MMTel - MultiMedia Telephony
MRFC - Media Resource Function Controller
MRFP - Media Resource Function Processor
MSC-S - Mobile Switching Center – Server
MT - Mobile Terminated


NMO - Network Mode of Operation / Network Operation Mode


OFDM - Orthogonal Frequency Division Multiplexig
OFDMA - Orthogonal Frequency Division Multiple Access


PCRF - Policy Control Rule Function
PUCCH - Physical Uplink Control Channel


QoS - Quality of Service
QAM - Quadrature Amplitude Modulation
QPSK - Quadrature Phase Shift Keying


RAN - Radio Access Network
RNC - Radio Network Controler
RA - Routing Area
RAU - Routing Area Update
RAT - Radio Access Technology
RNS - Radio Network Subsystem
RRC - Radio Resource Control
RTT - Round Trip Time


S-CSCF - Serving Call Session Control Function
SC-FDMA - Single Carrier Frequency Division Multiple Access
SAE - System Architecture Evolution
SBC - Session Border Controller
SLF - Subscription Locator Function
SIP - Session Initiation Protocol
SCTP - Stream Control Transmission Protocol
SGSN - Serving GPRS Supporting Node
SGW - Serving GateWay
SMS - Short Message Service
SRVCC - Single Radio Voice Call Continuity
SS7 - Signalling System No 7
SISO - Single Input Single Output
SIMO - Single Input Multiple Output


TA - Tracking Area
TAU - Tracking Area Update
TDD - Time Division Duplex
TDMA - Time Division Mutiple Access
TDM - Time Division Multiplexing


UCI - Uplink Control Information
UTRAN - UMTS Terrestial Radio Access Network
UMTS - Universal Mobile Telecommunications System
UE - User Equipment


VLR - Visitor Location Register
VoIP - Voice over IP
VoLTE - Voice over LTE


WCDMA - Wideband Code Division Multiple Access