mobile technology glossary

Here are the results for the letter c

CAI

Common Air Interface; a standard developed for the UK?s public CT2 networks which enabled the same handset to be used on different networks

Call barring

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

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

Call timer

A service which keeps track of the amount of airtime being used by the subscriber on a cumulative basis

Caller ID

Caller Identification; displays the name/number of the person calling a mobile phone. Also known as CLI

CAMEL

Customised Application for Mobile network Enhanced Logic; an IN feature in GSM networks that enables users to carry personal services with them when roaming into other networks that support CAMEL

Capacity

A measure of a cellular network?s ability to support simultaneous calls

CB

Cell Broadcast

CC

Call Control; manages call connections

CCB

Customer Care and Billing

CCCH

Common Control Channels; a group of uplink and downlink channels between the MS and the BTS (see PCH, AGCH and RACH)

CCS7

Common Channel Signalling No. 7

CDMA

Code Division Multiple Access; also known as spread spectrum, 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)

CDMA 1X

The first generation of cdma2000; the standardisation process indicated that there would be CDMA 2X and CDMA 3X but this no longer appears likely

CDMA 1X EV-DO

A variant of CDMA 1X which delivers data only

CDMA2000

A member of the IMT-2000 3G family; backwardly compatible with cdmaOne

CDMAone

The first commercial CDMA cellular system; deployed in North America and Korea; also known as IS-95

CDPD

Cellular Digital Packet Data; a packet switched data service largely deployed in the USA. The service uses idle analogue channels to carry the packetised information.

CDPSK

Coherent Differential Phase Shift Keying

CDR

Call Detail Records; the record made within the cellular network of all details of both incoming and outgoing calls made by subscribers, The CDR is passed to the billing system for action

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 splitting

The process of converting a single cell to multiple cells by sectorising the antennas in the cell site or constructing additional cells within a cell site

CELP

Code Excited Linear Prediction; an analogue to digital voice coding scheme, there are a number of variants used in cellular systems

CEPT

Conference of European Posts and Telecommunications. A organisation of national posts, telegraphs and telephone administrations. Until 1988, when this work was take over by ETSI, the main European body for telecommunications standardisation. CEPT established the original GSM standardisation group

CF

Call Forwarding

CI

Carrier to Interference ratio

CIBER

Cellular Intercarrier Billing Exchange Roamer Record

CID

Caller Identification

Circuit switching

A method used in telecommunications where a temporary dedicated circuit of constant bandwidth is established between two distant endpoints in a network. Mainly used for voice traffic; the opposite of packet switching

CLI

See Caller ID

CLID

Calling Line Identification

CLIP

Calling Line Identification Presentation

CLIR

Calling Line Identification Restriction

CLR

Clear; the key on a cellular phone which is pressed to remove information from the display

CM

Connection Management; is used to set up, maintain and take down call connections

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

CPE

Customer Premises Equipment; all the equipment on the end user?s side of the network interface

CPU

Central Processing Unit

CRC

Cyclic Redundancy Check

CRM

Customer Relationship Management

CSE

CAMEL Service Environment

CSS

Customer Support System

CT

Cordless Telephony

CT0

Zero generation cordless telephony; the earliest domestic cordless phones which used analogue technology and which had severe limitations in terms of range and security

CT1

First generation cordless telephony; Improved analogue phones with greater range and security; a number of European nations produced CT1 standards

CT2

Second generation cordless telephony; Using digital technology CT2 phones offered greater range, improved security and a wide range of new functionalities. Used in both domestic and cordless PABX deployments, CT2 was standardised as an interim ETS but was overwhelmed by DECT

CT2-CAI

Second generation cordless telephony-common air interface

CTA

Cordless Terminal Adaptor; a DECT term

CTM

Cordless Terminal Mobility

CTR

Common Technical Regulation; part of the ETSI standardisation process

CUG

Closed User Group