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U |
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Universal Mobile Telecommunications System (UMTS) |
The goal of UMTS is to enable networks that offer true global
roaming and can support a wide range of voice, data and
multimedia services. A new-generation technology for rapidly
moving data and multimedia over wireless devices. The European
implementation of the 3G wireless phone system, UMTS provides
service in the 2GHz band and offers global roaming and
personalized features; designed as an evolutionary system for
GSM network operators, multimedia data rates offered by UMTS
are: vehicular - 144 kbit/s; pedestrian 384 kbit/s; in-building
2Mb/s. |
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Universal Wireless Communications Consortium (UWCC) |
An
industry group supporting TDMA and WIN technology. |
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Uplink |
The portion of a telecommunications path from the ground to the
satellite, also referred to as the forward link. |
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UWC-136 |
A
third-generation wireless standard proposal based on TDMA
technology that was developed by the Universal Wireless
Communications Consortium and is one of the 3G candidates
submitted to the International Telecommunication Union by the
United States. UWC-136 represents an evolutionary path for both
the old analog Advanced Mobile Phone System (AMPS) and the
second-generation TIA/EIA-136 technologies, which were designed
specifically for compatibility with AMPS. UWC-136 radio
transmission technology proposes a low-cost incremental,
evolutionary deployment path for both AMPS and TIA/EIA
operators. The technology is tolerant of the frequency band in
which it is deployed: 500 MHz to 2.5 GHz. |
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V |
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Visitor Location Register (VLR) |
A
network database that holds information about roaming wireless
customers. |
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Voice Activation |
A
convenient safety feature that allows a subscriber to dial a
phone by voice instead of physically punching in the numbers. |
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Voice Recognition |
The capability for cellular phones, PCs and other communications
devices to be activated or controlled by voice commands. |
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W |
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Wavelength |
The distance covered by one cycle of a wave. |
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Wideband CDMA (WCDMA) |
A
3G mobile services platform, based on modern, layered
network-protocol structure, similar to the protocol structure
used in GSM networks. WCDMA has been designed for high-speed
data services and more particularly, internet-based packet-data
offering up to 2Mbps in stationary or office environments, and
up to 384Kbps in wide area or mobile environments. The third
generation radio standard that will offer voice, data,
motion-video and other multimedia capabilities, and increases
data transmission rates in GSM systems by using CDMA instead of
TDMA. WCDMA has become the Direct Sequence (DS) mode in the
ITU's 3G specification, which includes the 1X Multi-Carrier mode
(1X MC) and 3X Multi-Carrier mode (3X MC). 1X MC (formerly known
as cdma2000) and 3X MC comprise the 3G upgrade path for carriers
already using CDMA (cdmaOne). |
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Wideband Packet CDMA (WPCDMA) |
A
technical proposal from Golden Bridge Technology that wraps
WCDMA and cdma2000 into one standard. |
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Wireless Application Protocol (WAP) |
An
open standard for communication between handsets and the
Internet. WAP is a wireless communications environment for
delivering web data to wireless terminals with minimal screen
display. An initiative started by Unwired Planet, Motorola,
Nokia and Ericsson to develop a standard for wireless content
delivery on the next generation of mobile communicators. WAP
strips all but graphics for display on small screens, such as
mobile phones. A mini-browser is an integral part of WAP enabled
phones. WAP enabled phones first appeared in Europe at the end
of 1999. |
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Wireless Communications Services (WCS) |
The variety of services available using frequencies in the 2.3
GHz band for general fixed wireless use. |
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Wireless Instant Messaging (WIM) |
Bridges the gap between wired and wireless networks. WIM
seamlessly allows a desktop user to instantly send a message to
a handset. |
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Wireless Intelligent Network (WIN) |
The architecture needed to match the capabilities of the
wireline intelligent network. In addition to transparent
roaming, selective call screening, short message service and
pre-paid billing are features that a WIN can provide. |
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Wireless Markup Language/Script (WML/WMLScript) |
The languages used to create WAP pages. WML is similar to the
way HTML is used to create web pages and WMLScript is based on
JavaScript. Both are adapted and optimized for a wireless
environment (compression to save bandwidth). |
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Wireless Telephone Base Station |
The combination of antennas and electronic equipment used to
receive and transmit wireless telephone signals. Sometimes
called a base station. |
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Wireless Transport Layer Security (WTLS) |
The security layer of the WAP which provides privacy, data
integrity and authentication for WAP services. WTLS, designed
specifically for the wireless environment, is needed for the
client and server to be authenticated in order for wireless
transactions to remain secure and also because the connection
needs to be encrypted. For example, a user making a transaction
with a bank over a wireless device needs to know that the
connection is secure and private and not subject to a security
breach during transfer. WTLS is needed because mobile networks
do not provide complete end-to-end security. |
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