| Call Drop Rate |
A dropped call rate out of completed sending calls(a
sending call drop rate) or out of completed receiving calls(a
receiving call drop rate). |
| |
|
| CLI |
Caller Line Identification. Service that allows
a customer to see the number of the caller before answering
the call. |
| |
|
| Carrier |
A licensed company (network operator) may market
any number of communication services for voice and data. Carriers
offer their services to both end-customers (private or business)
and other carriers. In the latter case, the service simply consists
of transport capacity for long-distance traffic. For example,
local/regional network operators will buy transport capacity
from carriers that operate on a global basis. |
| |
|
| CDMA |
Code Division Multiple Access. The code division
technology was originally developed for military use over 30
years ago. CDMA is a multiple access technique, which uses code
sequences as traffic channels within common radio channels -
used for CDMA One (IS-95) air interface. |
| |
|
| CDMA2000 |
Common name for IMT-2000 CDMA Multi-Carrier. |
| |
|
| CDMA2000 1X |
The first step in the evolution to 3G is cdma2000
1X, which improves packet data transmission capabilities and
speeds in the network, and also boosts voice capacity by nearly
two times over today's CDMA capacities. Speed of upto 144kpps. |
| |
|
| CDMA2000 1xEV-DO |
(Evolution Data-Only). CDMA2000 1XEV represents
the second step in the evolution of CDMA2000. Commercially launched
in 2001, offers data speeds of up to 2.4 Mbps on a separate
1.25 MHz carrier. |
| |
|
| CDMA2000 1xEV-DV
|
(Evolution Data-Voice). CDMA2000 1XEV represents
the second step in the evolution of CDMA2000. Recently approved
by ITU as a 3G technology, will provide data and voice together
on a single 1.25 MHz channel, with data rates of up to 4.8 Mbps.
|
| |
|
| CDMA2000 3X |
3G technology which offers voice and data on a
5MHz carrier (or 3 times [3X] the 1.25 MHz carrier). Full 3G
version of CDMA2000. Technology is similar to CDMA2000 1x, but
the peak data rate is 2Mbps. |
| |
|
| CDMAOne (IS-95) |
cdmaOne is a digital mobile phone standard based
on the CDMA principle, which is used in North America, Korea
and Japan. cdmaOne uses frequency ranges around 800MHz and 1900MHz.
For migration to third generation mobile telephony, cdmaOne
networks can be upgraded to the cdma2000 broadband standard. |
| |
|
| CDPD: |
Cellular digital packet data. A digital cellular
standard used in some smart phones. Transmission rates are limited
to 19.2 kbps. |
| |
|
| Cell |
The basic geographical unit of a cellular communications
system. Service coverage of a given area is based on an interlocking
network of cells, each with a radio base station (transmitter/receiver)
at its center. The size of each cell is determined by the terrain
and forecasted number of users. |
| |
|
| Cell Switching |
Feature that enables a caller to move from one
location to another without losing the connection. The cellular
system is designed to switch calls to a new call without a noticeable
drop in the connection. While not noticeable in voice communications,
the 300 milliseconds required for cell switching can cause problems
in data transmission. |
| |
|
| Cellular |
Circuit-switched voice telephone communications
via cellular radio channels. The service area is divided into
many cells and in each there is a base station handling the
communications in that particular cell. |
| |
|
| Cellphone |
An American term for mobile phone. |
| |
|
| Channels |
An individual UMTS radio channel is defined in
the IMT 2000 standard as having a bandwidth of 5 MHz. This means
that an individual UMTS radio channel, for example, ranges from
1900 to 1905 MHz. How many radio channels a UMTS provider can
make available to customers depends on which frequency spectrum
has been won in the auctioning of UMTS mobile phone frequencies.
Each radio channel can transport more than one connection. So
that more than one subscriber can use the same channel, multiple
access methods such as W-CDMA (FDD), TD-CDMA (TDD) or cdma2000
are used for 3G networks. It nevertheless depends on the service
profile of the connection how many connections per channel can
be managed at the same time. It is also true that in the planning
of the radio network, the effect of cellular respiration for
CDMA should be considered. |
| |
|
| Circuit switching |
A method of communicating in which a dedicated
communications path established between two devices through
one or more intermediate switching nodes. Unlike packet switching,
digital data are sent as a continuous stream of bits. Bandwidth
is guaranteed, and delay is essentially limited to propagation
time. The telephone system uses circuit switching. |
| |
|
| Conference call |
Allows you to speak to more than one person at
the same time. This can be extremely useful for remote business
meetings. To use this service, it must be supported by your
network and by your phone. You may also have to add this service
to your subscription. |
| |
|
| Core Network |
The switching part of the UMTS network. It provides
call control and performs mobility and high-level security functions
such as location updating and authentication. Core network includes
a radio access network, terminals and applications. |
| |
|
| Core router |
Core routers are switching computers used on the
main connection links (backbone) of a network. These switching
computers are particularly powerful, and specialize in the transfer
of huge data volumes over the information highway. |
| |
|
| Coverage |
The geographical reach of a mobile phone network
or system. |
| |
|
| CRM |
Customer Relationship Management. A vast way of
approach to customers in an attempt to realize their living
style in every field of life and eventually to influence them
to change their life style toward their benefitable direction
through the company initiating ceaseless communication of indirect,
implicative and inspiring suggestion so that the company may
attract new customers and bind existing customers steady with
the company. |
| |
|
| CSD |
Circuit Switched Data: is the traditional technology
used for the exchange of data. A circuit connection is made
that is exclusively reserved for the individual’s use. Payment
is then made in accordance with the duration of the connection.
This can be inefficient, for example when connecting to the
internet using WAP, as more time is spent reading the information
than is spent exchanging data, however you continue to pay when
you are reading. For corporate e-mail services however, applications
have been developed where the user works “off line” and then
only connects to the server to download and receive e-mails.
|
| |
|
| CTIA |
Cellular Telecommunications Industry Association.
A trade group representing cellular, PCS and enhanced specialized
mobile radio carriers. |
| |
|
