3G Mobile Phones


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Glossary

CDMA: Code Division Multiple Access
A technology for encoding a digital signal over the wireless telephone transmission service, which allows multiple users access to the network at the one time.

CDMA2000 or 1XRTT (Radio Transmission Technology)
Another version of CDMA that uses a single radio channel to provide data rates up to 144Kbps.

GSM: Global System for Multiple Communications
The world's most widely used digital mobile phone network.

HSDPA: High Speed Download Packet Access
A 3G technology that allows for higher data transfer speeds over a mobile network.

EDGE: Enhanced Data rate for GSM Evolution
A modulation scheme to increase data rates in existing GSM networks.

EVDO: Evolution Data Only or Evolution Data Optimised
An evolution of the CDMA mobile network allowing for increased data rates.

TDD: Time Division Duplex
Uses a combination of time division and code division multiple access for the mobile phone network.

TDM: Time Division Multiplexing
The combination of numerous signals for transmission of a single communications channel or line with each signal broken into different segments of short duration.

TDCDMA: Time Division CDMA

TDMA: Time Division Multiple Access
A technology for delivering digital mobile services by dividing radio frequency into time slots and then allocating a slot to each call. A single frequency can support multiple, simultaneous data channels.

TD-SCDMA: Time Division Synchronous CDMA
Uses the TDD to transmit uplink and downlink traffic in the same frame in different time slots.

UMTS: Universal Mobile Telecommunications System
This is a 3G packet-based transmission of text, voice, video and multimedia data rates higher than 2Mbps.

UTRA: Universal Terrestrial Radio Access
A standard for 3G mobile communications where the radio access components are based on WCDMA and TDCDMA access methods.

VHE: Virtual Home Environment
VHE is part of the IMT-2000/WCDMA and UMTS mobile phone network. With VHE, a user can take their home network on the road by emulating the same access and services they have within their fixed environment.

WCDMA: Wideband Code Division Multiple Access
A 3G technology that increases data transmission by using code division (CDMA) rather than time division (TDMA) technology.

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GoodGearGuide Staff

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