basic gsm abbreviations

7/31/2019 Basic GSM Abbreviations

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Basic GSM abbreviations ________________________________________

AAL - ATM Adaptation Layer A-bis = Interface between the BSC and BTS in a GSM network AB - Access Burst used for random access and characterised by a longer guard period to allow for burst

transmission from a MS that does not know the correct timing advance when first contacting

a network ABR - Available Bit Rate AC - Alternating Current ( the standard electricity type ) ACCH - Analog Control Channel ACTS - Advanced Communications Technologies and Services.

a European technology initiative

ACU - Antenna Combining Unit AC Charger : an accessory device that allows you to power and/or charge your phone from a wall outlet

ADC - Analog to Digital Converter Advice of charge: A service which provides the user with information on the cost of calls from a mobile phone

AFC - Automatic Frequency Control AGC - Automatic Gain Control AGCH - Access Grant Channel; downlink only, BTS allocates a TCH or SDCCH to the MS,

allowing it access to the network A-interface : Interface between the MSC and BSS in a GSM network

AM - Amplitude Modulation AMPS - Advanced Mobile Phone Service Advanced Mobile Phone System (AMPS) is the analog mobile phone system standard

developed by Bell Labs, and officially introduced in the Americas in 1983[1][2] It was the



primary analog mobile phone system in North America (and other locales) through the 1980s

and into the 2000s, and is still widely available today, although use has dropped

considerably with the introduction of various digital standards. Total Access Communication System (TACS) and ETACS are mostly-obsolete variants of

AMPS which were used in some European countries (including the UK). TACS was also usedin Japan under the name Japanese Total Access Communication (JTAC).[3][4]

AMR - Adaptive Multi-Rate codec. Developed in 1999 for use in GSM networks, the AMRhas been adopted by 3GPP for 3G

Analogue: The representation of information by a continuously variable physical quantity such as

voltage

Antenna: a part of a cell phone that receives and transmits cellular radio-frequency transmissions

ASCII American Standard Code for Information Interchange ASIC - Application Specific Integrated Circuit

Electronic chips designed for some concrete purposes (for example, in phone it controllscommunication between MCU and DSP) They're designed and produced by the companies

which use them. ATM Asynchronous Transfer Mode; a multiplexed information transfer and switching method in

which the data is organised into fixed length 53-octet cells and transmitted according to

each application’s instantaneous need AVCH - Analog Voice Channel

BB5 - base band 5

BCC - Base-station Color Code B-CDMA - Broadband Code Division Multiple Access BCH - Broadcast Channels( carry only downlink information and are mainly responsible for

synchronisation and frequency correction (BCCH, FCCH and SCH)



BCCH - Brodcast Control Channel the logical channel used in cellular networks to broadcast signalling and control information

to all mobile phones within the network

BGA - ball grid array

B-ISDN - Broadband ISDN BPS - Bits Per Second ( a measure of how fast binary digits can be sent through a channel. The number of 0s and

1s that travel down the channel per second.) Base transceiver Station Identity Code BTS - Base Transceiver Station (This device allows communication between phones and cellular network or it is the network entity which communicates with the mobile station) Back -light Illumination illuminates a wireless device’ s display and keypad for better low light viewing Band : a specific range of frequencies in the radio frequency (RF) spectrum. Battery:

A chargeable device which provides the mobile phone with power. A variety of battery

technologies have been used for mobile phones including nickel cadmiu(NiCad),nickel metal

hydride (NiMH) and lithium ion (Li-ion)

Battery status/Battery charge display An indication of the amount of battery life remaining Battery Capacity the capacity of wireless devices’ battery. Measured in milliampere hours

(mAh). Call barring

A service which enables users to bar certain incoming or outgoing calls on their mobile

phones Call timer:

A service which keeps track of the amount of airtime being used by the subscriber on acumulative basis Call divert: The capability to divert incoming calls to another phone (fixed or mobile) or to an answering

service Call hold:



The ability to put an ongoing call on hold whilst answering or making a second call Caller ID: Caller Identification (displays the name/number of the person calling a mobile phone. Also

known as CLI) CB - Cell Broadcast CCCH - Common Control Channels; a group of uplink and downlink channels between the MS

and the BTS (see PCH, AGCH and RACH) CCONT- Current Controller (in nokia fones) CDMA - Code Division Multiple Access (Code Division Multiple Access; also known as spread spectrum (or IS-95), CDMA cellular

systems utilise a single frequency band for all traffic, differentiating the individual

transmissions by assigning them unique codes before transmission. There are a number of variants of CDMA (see W-CDMA, B-CDMA, TD-SCDMA et al) Cell: The area covered by a cellular base station. A cell site may sectorise its antennas to service

several cells from one locationCell site The facility housing the transmitters/receivers, the antennas and associated equipment

Cell Site: a fixed cellular tower and radio antenna that handles communication with subscribers in a

particular area or cell. A cellular network is made up of many cell sites, all connected back tothe wired phone system. CF - Call Forwarding CI - Carrier to Interference ratio CID - Caller Identification Circuit switching:

A method used in telecommunications where a temporary dedicated circuit of constantbandwidth is established between two distant endpoints in a network. Mainly used for voice

traffic; the opposite of packet switching

CNT- Content



COBBA- Common Baseband Analog CPU - Central Processing Unit

CMOS - Complementary Metal Oxide Substrate

Codec: A word formed by combining coder and decoder the codec is a device which encodes and

decodes signals. The voice codec in a cellular network converts voice signals into and back

from bit strings. In GSM networks, in addition to the standard voice codec, it is possible to

implement Half Rate (HR) codecs and Enhanced Full Rate (EFR) codecs Control signal:

A signal sent to a cellular phone from a base station or vice versa which carries information

essential to the call but not including the audio portion of a conversation

CRC - Cyclic Redundancy Check CT - Cordless Telephony CTA - Cordless Terminal Adaptor (a DECT term) CTM - Cordless Terminal Mobility CTR - Common Technical Regulation CUG - Closed User Group D/A - Digital to Analogue conversion DAC - Digital to Analogue Convertor D-AMPS - Digital AMPS, a US wireless standard also known as IS-136

Data capable:

Mobile phones which have the capability to enable transmission of data from a laptop

computer or PDA via the phone Datacable : interface for conecting a mobile fone to pc db - decibel (unit if sound)



DCT /3,4 - digital core technology DCT/L - digital core technology linda DCCH - Digital Control Channel DTCH - Digital Traffic Channel

DTX - Discontinous Transmission Exchange DCA - Dynamic Channel Assignment DCCH - Dedicated Control Channels ( responsible for roaming, handovers, encryption etc) DCE - Data Communications Equipment DCH - Data Clearing House DCS1800 - Digital Cellular System at 1800MHz, now known as GSM1800 Digital: a method of representing information as numbers with discrete values; usually expressed as

a sequence of bits Digital a method of encoding a transmission that involves translating information (in the

case of digital phones the information would be a voice conversation) into a series of 0’s and

1’s. Digital communications technology offers cleaner calls without the static and distortion

that is common with analog phones. The majority of new handsets sold today are digital

rather than analog technology.

DSP - Digital Signal Processor Digital Signal Processing refers to manipulating analog information, such as sound or

photographs that has been converted into a digital form to improve accuracy and reliability

of digital communications.

DSC- Digital Signal Controller DTE - Data Terminal Equipment DTMF - Dual Tone MultiFrequency; (better know as Touch Tone. The tones generated by touching the keys on the phone are

used for a variety of purposes ) DTX - Discontinuous Transmission Dual Band:



The capability of GSM infrastructure elements and handsets to work across both the 900MHz

and 1800MHz bands. The capability to seamlessly handover between the two bands offers

operators major capacity gains Duplex: The wireless technique where one frequency band is used for traffic from the network to thesubscriber (the downlink) and another, widely separated, band is used for traffic from the

subscriber to the network (the uplink)

EEPROM - Electrically Erasable Programmable Read Only Memory EFR- Enhanced Full Rate (Enhanced Full Rate (codec): an improved version of the standard voice codec used in GSM

phones; offers improved speech quality without impacting on network capacity)

EFT - Electronic Funds Transfer

EGSM - Extended (frequency range) GSM EIR - Equipment Identity Register (a database that contains a list of all valid mobile stations

within a network based on their IMEI) EIRP - Effective Isotropic Radiated Power EPOC : The mobile phone operating system developed by Symbian. Derived from epoch-the

beginning of an era-EPOC is a 32-bit operating environment which comprises a suite of applications, customisable user interfaces, connectivity options and a range of development

tools EPROM - Erasable Programmable Read Only Memory ESMR - Enhanced Special Mobile Radio; a US PMR variant (see SMR) ESN - Electronic Serial Number; a 32-bit number that uniquely identifies a mobile phone

FB - Frequency Correction Burst; used for frequency synchronisation of the mobile

FDD - Frequency Division Duplex FOMA - Freedom Of Mobile multimedia Access Gbit/s:

A unit of data transmission rate equal to one billion bits per second



GMSC - Gateway Mobile Services Switching Centre; the gateway between two networks GCF - Global Certification Forum

Geostationary:

Refers to a satellite in equatorial orbit above the earth which appears from the surface to be

stationary GERAN - GSM-EDGE Radio Access Network the name for the evolution of GSM towards 3G

based on EDGE GGRF - GSM Global Roaming Forum GGSN - Gateway GPRS Support Node; the gateway between a cellular network and a IP

network. GHz:

A unit of frequency equal to one billion Hertz per second GMPCS - Global Mobile Personal Communications by Satellite GMSK - Gaussian filtered Minimum Shift Keying GPRS: General Packet Radio Service (GPRS) is a mobile data service available to users of GSM and

IS-136 mobile phones. GPRS data transfer is typically charged per megabyte of transferred

data, while data communication via traditional circuit switching is billed per minute of connection time, independently of if the user actually has transferred data or been in an idle

state. GPRS can be utilized for services such as WAP access, SMS and MMS, but also for

Internet communication services such as email and web access. In the future, it is expected

that low cost voice over IP will be made available in cell phones.

GPS: The Global Positioning System (GPS), is currently the only fully-functional satellite

navigation system. More than two dozen GPS satellites are in medium Earth orbit,

transmitting signals allowing GPS receivers to determine the receiver's location, speed anddirection.

GRX - GPRS Roaming Exchange GSM



The Global System for Mobile Communications, GSM (original acronym: Groupe Spécial

Mobile) is the most popular standard for mobile phones in the world. GSM service is used by

over 2 billion people across more than 212 countries and territories.[1][2] The ubiquity of

the GSM standard makes international roaming very common between mobile phone

operators, enabling subscribers to use their phones in many parts of the world. GSM differssignificantly from its predecessors in that both signaling and speech channels are Digital call

quality, which means that it is considered a second generation (2G) mobile phone system.

This fact has also meant that data communication was built into the system from the 3rd

Generation Partnership Project (3GPP).

Hands-free: The operation of a cellular phone without using the handset; usually installed in vehicles. Handoff: The transfer of control of a cellular phone call in progress from one cell to another, withoutany discontinuity

HR - Half Rate Traffic

IC - Intergrated Circuit ICSP - In Circuit Serial Programming

IF- Intermediate Frequency

Infrared data port: A facility on a mobile phone to allow information to be exchanged with other devices e.g. a

PC using infra red technology Internet The Internet is the worldwide, publicly accessible network of interconnected computer

networks that transmit data by packet switching using the standard Internet Protocol (IP).

It is a "network of networks" that consists of millions of smaller domestic, academic,

business, and government networks, which together carry various information and services,

such as electronic mail, online chat, file transfer, and the interlinked Web pages and otherdocuments of the World Wide Web.

IMEI - International Mobile Equipment Identity The International Mobile Equipment Identity (IMEI) is a number unique to every GSM and

UMTS mobile phone. It is usually found printed on the phone underneath the battery and can



also be found by dialing the sequence *#06# into the phone. The IMEI number is used by the GSM network to identify valid devices and therefore can be

used to stop a stolen phone from accessing the network. For example, if a mobile phone is

stolen, the owner can call his or her network provider and instruct them to "ban" the phone

using its IMEI number. This renders the phone useless, regardless of whether the phone'sSIM is changed.

I-mode: A service developed by Japanese operator NTT DoCoMo, I-mode delivers a huge range of

services to subscribers and has proved enormously popular with some 30 million regular

users. The revenue sharing model used for I-mode is being adopted by other operators as

the basis for the new services enabled by GPRS and 3G

IMSI - International Mobile Subscriber Identity (an internal subscriber identity used only by the network)

IP - Internet Protocol

IrDA - Infra red Data Association

Iridium:

A low earth orbit satellite communications system developed initially by Motorola. ISDN - Integrated Services Digital Network ISO International Standards Organisation ISP - Internet Service Provider iTAP: software developed by Motorola and built into some wireless phones and PDAs that makestyping words on a keypad easier. The competitor to iTAP is T9 JAF - Just Another Flasher Java:

A programming language developed by Sun Microsystems Java is characterised by the fact

that programs written in Java do not rely on an operating system



JPEG- Joint Photographic Experts Group JTAG - Joint Test Action Group

Kbps : Kilobits Per Second, a measure of bandwidth

LAN Local Area Network LANS Local Area Network Services LED - Light Emitting Diode (a semiconductor device that illuminates when electricity passes through it. Often used as

an indicator light, or to spell out words and numbers. LEDs come in many colors, and someLEDs contain multiple elements and are therefore capable of multiple colors. Provides good

visibility in direct sunlight and in darkness)

LPT - Line Print Terminal LMSS Land Mobile Satellite Service Lock

A function on a cellular phone which, when activated, prevents use of the phone until theuser enters a security code LCD - Liquid crystal display

Lithium Ion battery: a type of rechargeable battery for cell phones which is generally lighter weight than earlier

battery types, has a relatively longer cycle life, and generally does not suffer from “memory”

effect. MAC - Media Access Control; the lower sublayer of the OSI system MAD - Memory Analog Digital MAP - Mobile Application Part Mb- Megabite



( a unit of data transmission speed equal to one million bits per second)

MCC - Mobile Country Code

MCU - Micro Control Unit

MCPA - Multi Carrier Power Amplifier MHz - Megahertz (a unit of frequency equal to one million Hertz) MMI - Man Machine Interface MMS - Multimedia Messaging Service (an evolution of SMS, MMS goes beyond text messaging offering various kinds of multimedia

content including images, audio and video clips) Modulation: The process of imposing an information signal on a carrier. This can be done by changing the

amplitude (AM), the frequency (FM) or the phase, or any combination of these MPEG: Motion Picture Experts Group; MPEG4 is a technology for compressing voice and video so

that the information can be transmitted over normally difficult links such as mobile radio MS - Mobile Station

MSIN - Mobile Station Identification Number

MSISDN - Mobile Station International ISDN Number MSK - Minimum Shift Keying (Another term for FFSK) Multiplexing:

A telecommunications technique where several channels can be combined to share the same

transmission medium. The most common forms are Time Division Multiplexing (TDM) and

Frequency Division Multiplexing (FDM)

Master Reset: restores the setting to factory MIDI - Musical Instrument Digital Interface (a standard that allows digital musical instruments to communicate with one another. In cell

phone terms, MIDI is what gives you polyphonic sounds; which means your ring tones can

sound like real music instead of beeps. )



MMS - Multimedia Messaging Service (a further extension of SMS and EMS.MMS is designed to make use of newer and quicker

mobile transmission methods such as GPRS, HSCSD, EDGE and UMTS, involving the

attachment of multimedia extensions to messages, such as video and sound. An e-mail

function is also planned. )

MO-SMS - Mobile-Originated Short Message Service (the ability to send short text messages from a phone. Both the phone and the carrier’s

network must support this feature for it to work. Messages can be sent to other phones by

phone number. Many phones also allow sending messages directly to e-mail addresses. )

NCC (National Color Code or Network Color Code NET Norme Europeenne de Telecommunications

NMSI - National Mobile Subscriber Identity No Service:

An indication on the display of a cellular phone that indicates that the user is in an area

where cellular service is unavailable

OMAP - Open Multimedia Applications Platform OTP - One Time Programable

PCM Pulse Code Modulation; the standard digital voice format at 64kbit/s PCMCIA Personal Computer Memory Card Interface Association the body responsible for defining the standards and formats for memory expansion cards for laptop computers and PDAs. Now extended to cover cards for mobile phones

PCU Packet Control Unit; an element in a GPRS/UMTS network PDA



Personal Digital Assistant

PIN Personal Identifier Number

PSU Power Supply Unit

PCN Personal Communications Networks; an outdated term for GSM services in the 1800MHz

band PDA Personal Digital Assistant; a sophisticated handheld device with advanced display

facilities and a range of business-oriented software programs Phone book

A list of personal names and numbers stored in a mobile phone’s internal memory or in the SIM card. These numbers can be called by accessing the appropriate memory and making a single key stroke

PIN

Personal Identity Number; a number, usually four digits, that must be keyed into a mobile phone to make it work. A security measure to prevent unauthorised usage P-Java (Personal Java) a Java API and specification for running Java applications on small devices. Packet a piece of data transmitted over a packet-switching network such as the Internet

or wireless Internet; a packet includes not just data but also its destination.

Packet Switching a type of communication that splits information into “packets” of data for transmission. This is efficient, as it only uses radio spectrum when it’s actually sending something, rather than keeping an open channel at all times (as is done in



circuit switching). Packet switching is a core component to 3G technology. Passive Matrix Display an LCD technology that uses a grid to supply the charge to each particular pixel on the display. An STN screen has a slower refresh rate than a TFT screen, but it’s cheaper. Also called a SuperTwist Nematic of STN display. PC Card (PCMCIA) a removable, credit-card sized devices that may be plugged into slots in PCS and wireless communication devices to provide fax or modem functions or network cards. PCMCIA (Personal Computer Memory Card International Association) a group of hardware

manufacturers and vendors responsible for developing standards for PC Cards (also

called PCMCIA cards.) PCN: also known as DCS 1800 or GSM 1800, PCN is a term used to describe a wireless communication technology in Europe and Asia. PDA (personal digital assistant) a portable, handheld computing device that acts as an electronic organizer. PDAs are typically used for managing addresses, appointments, to-do lists and notes, but some newer models support wireless Internet access, e-mail, and other interactive applications. Also referred to as Handheld Computers. PDAs come in two major flavors - Palm and Pocket PC. PIN (Personal Identification Number) a numeric code or password that may be required by

a service provider in order to make outgoing calls or obtain access to certain

applications and data. This code is always associated to a SIM card, not a phone and is designed to help guard against cellular fraud. PTT (Push-To-Talk) a two-way communication service that works like a “walkie talkie”.



This feature, found on Motorola iDEN phones from Nextel and Telus Mobility’s Mike, allow communication in only direction at a time unlike a cell phone that allows for simultaneous conversations. New PTT systems are now being introduced that use VoIP technology to provide PTT service digitally over 3G data networks PUK (Personal Unblocking Code) used to unblock a blocked SIM card, this code is given during the sub******ion of a phone PWR: represents the on/off (power) key on some wireless devices.

RAM - Random Access Memory

RAP3G- Radio Application Processor 3rd Generations

Reuse: The assignment of frequencies or channels to cells so that adjoining cells do not use the

same frequencies and cause interference whereas more distant cells can use the same

frequencies. Reuse expands the capacity of a cellular network by enabling the use of the

same channels throughout the network

RF AMP = Radio Frequency Amplifier RFP - Radio Fixed Part (equivalent to a base station in a DECT system) RP - Radio Part Roaming:

A service unique to GSM which enables a subscriber to make and receive calls when outside

the service area of his home network e.g. when travelling abroad Router:

A device which forwards information in a network on a connectionless basis

RT - Remote Terminal RX :- signal received



SAR - Specific Absorption Rate

S-CDMA - Synchronous CDMA (see CDMA) SCH - Synchronisation Channel (downlink only frame synchronisation and identification of base station) SCP - Switching/Service Control Point SDCCH - Stand-alone Dedicated Control Channel; communications channel between the MS

and the BTS. Used for signalling during call set-up before a TCH is allocated

Security Code: a numeric code (password) used to prevent unauthorized or accidental alteration of data

programmed into wireless phones. The security code can be used by the owner of a phone to

change the lock code.

SIM - Subscriber Identity Module A smart card containing the telephone number of the subscriber, encoded network

identification details, the PIN and other user data such as the phone book. A user’s SIM card

can be moved from phone to phone as it contains all the key information required to activatethe phone

Streaming: An Internet derived expression for the one-way transmission of video and audio content

Smartphone: a combination of mobile phone and personal digital assistant

SMS - Short Message Service

(a text message service which enables users to send short messages (160 characters) to

other users. A very popular service, particularly amongst young people, with 400 billion SMS

messages sent worldwide in 2002)

SP - Service Provider



SRAM - Syncronous Random Access Memory

Standby time: The length of time a battery can power a mobile phone when it is switched on but not

making or receiving calls

Symbian: A company created by Psion, Nokia, Ericsson and Motorola in 1998 with the aim of

developing and standardising an operating system which enable mobile phones from

different manufacturers to exchange information The operating system is known as EPOC. Matsua has subsequently joined Symbian

TACS - Total Access Communications System TAP - Transferred Account Procedure (the essential charging methodology for international GSM roaming. There have been four

TAP standards, TAP1, TAP2, TAP2+ and TAP3. The latter offers variable record length and is

sufficiently flexible to support all future requirements arising from the move to 3G)

TFD : Thin Film Diode

(a type of LCD (Liquid Crystal Display) flat-panel display technology. TFD technology

combines the excellent image quality and fast response times of TFT, with the low power

consumption and low cost of STN.) TFT - Thin Film Transistor (an LCD technology that uses transistors to precisely control the voltage to each liquid

crystal cell. This is also referred to as an “active matrix” display. TFT screens offer the best

image quality and refresh rates, but at a higher cost.)

Tri-band:

Refers to a mobile phone able to operate on the three internationally designated GSM

frequencies- 900, 1800 and 1900MHz TRX: Transmitter/receiver (transceiver) Total Access Communications System (an AMPS variant deployed in a number of countries

principally the UK)



Talk-time: The length of time a battery can power a mobile phone when making or receiving calls

T9 :

software built into some wireless phones and PDAs that makes typing words on a keypad

easier. The competitor to T9 is iTAP

Tri-Band fone: a phone capable of operating on three different digital frequencies (example: 900MHz,

1800MHz and 1900MHz).

U Upp - Universal power processor UI - User Interface

UMTS - Universal Mobile Telecommunications System (the European entrant for 3G; now subsumed into the IMT-2000 family as the WCDMA

technology.)

UPN - Universal Personal Number

URL - Uniform Resource Locator( the addressing system of the Internet) UTRA - Universal Terrestrial Radio Access USIM - Universal Subscriber Identity Module; the 3G equivalent of the GSM SIM UWB - Ultra Wide Band

USB - Universal Serial Bus

VBR - Variable Bit Rate

VCO - Voltage Control Oscillator



VHE - Virtual Home Environment VLR - Visitor Location Register Vocoder - Voice coder VoIP - Voice over Internet Protocol VPN - Virtual Private Network VSAT - Very Small Aperture Terminal VSELP - Vector Sum Excited Linear Prediction VSLI- Very Large Scale Integration

Voicemail:

A service offered by network operators whereby calls received when the mobile is in use,

switched off or out of coverage can be diverted to an answering service which can be

personalised by the user

WAP - Wireless Application Protocol (Wireless Application Protocol; a de facto standard for enabling mobile phones to access the

Internet and advanced services. Users can access websites and pages which have been

converted by the use of WML into stripped-down versions of the original more suitable for

the limited display capabilities of mobile phones)

WASP - Wireless Application Service Provider

Web clipping: this is an application that allows a user to extract relevant information from a web page for

display on a smart phone or a PDA. Wi-Fi Wireless Fidelity, the popular term for the 802.11b wireless Ethernet standard.

Windows CE: a streamlined version of Windows from Microsoft for handheld computers which has since

been upgraded and renamed Pocket PC. Windows CE run Pocket versions of Microsoft office

applications such as Word and Excel as well as many applications that were geared

specifically for the smaller platform.



WLAN - Wireless Local Area Network a short range radio network normally deployed in traffic hotspots such as airport lounges,

hotels and restaurants. WLAN enables suitably equipped users to access the fixed network

wirelessly, providing high speed access (up to 11Mbit/s download) to distant servers. The

key WLAN technologies are the IEEE802.11 family and ETSI HIPERLAN/2

basic gsm abbreviations

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