3G provides accelerated data speeds and simultaneous voice and data capabilities for an amazing wireless voice and data experience.
Access CV for faster on-demand viewing of high quality video clips from your favorite TV shows, news, sport and weather
Surf the wireless Internet faster and significantly lower your wait for page loads
Download files and access email faster from favorite providers like Yahoo!, MSN, and AOL.
Multi-task while you are on a call—search for movies times, look up directions, or send messages.
Get more done with faster access to email and internet. AT&T LaptopConnect gives you the power of the AT&T network while you’re on the go
How fast is AT&T’s mobile broadband 3G network?
AT&T offers the nation’s fastest 3G network. 3G speeds for supported devices deliver:
Typical download speeds of 700 Kbps—1.7 Mbps
Typical upload speeds of 500 Kbps—1.2 Mbps
Technology
The AT&T 3G network uses HSDPA/UMTS technology (High Speed Downlink Packet Access/Universal Mobile Telephone System), which makes it possible to enjoy a variety of feature-rich wireless services. It also gives AT&T the advantage of offering simultaneous voice and data services. That means you can talk and use the Internet at the same time. How's that for multitasking?
Availability
Check the coverage viewer for mobile broadband 3G coverage in your area.
Disclaimer: 3G network not available in all areas
Disclaimer: Referenced speeds require an HSDPA 3.6Mbps / HSUPA capable device with Receive Diversity and/or Equalizer. BroadbandConnect speed claims based on our network tests without compression using 3MB data files. 3G devices not enabled with HSUPA support typical upload speeds of 220-320kbps based on our network tests without compression using 500KB data files for upload. Actual throughput speed varies.
Showing posts with label 3g. Show all posts
Showing posts with label 3g. Show all posts
Sunday, April 12, 2009
CDMA 3G Variants (in the IMT-2000 Family)
In this section we cover the following
:: cdma2000
:: cdma2000 1X-EV-DO
:: cdma2000 1X-EV-DV
:: cdma2000 3X
CDMA aficionados are rigorously promoting a technically benign upgrade of existing cdmaOne (IS-95) CDMA networks to faster cdma2000 technology, a CDMA 3G standard that they say can provide the same level of 3G service claimed by W-CDMA/UMTS promoters. There are various types of cdma2000 types, explained below.
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cdma2000 1X
The 1xEV specification was developed by the Third Generation Partnership Project 2 (3GPP2), a partnership consisting of five telecomnunications standards bodies: CWTS in China, ARIB and TTC in Japan, TTA in Korea and TIA in North America.It is also known as High Rate Packet Data Air Interface Specification. It delivers 3G-like services up to 140 kbps peak rate while occupying a very small amount of spectrum (1.25 MHz per carrier), protecting this precious resource for operators.
cdma2000 1X EV-DO
1X EV-DO, also called 1X-EV Phase One, is an enhancement that puts voice and data on separate channels in order to provide data delivery at 2.4Mbit/s. It was developed by the Third Generation Partnership Project 2 (3GPP2), a partnership consisting of five telecomnunications standards bodies. Also known as High Rate Packet Data Air Interface.
cdma2000 1X EV-DV
EV-DV, or 1X-EV Phase Two with promises of data speeds ranging from 3Mbps to 5Mbps. As many as eight proposals have been submitted to standards committee 3GPP2 for the design of EV-DV
cdma2000 3X
CDMA2000 3x is an ITU-approved, IMT-2000 (3G) standard. It is part of what the ITU has termed IMT-2000 CDMA MC. It uses 5 Mhz spectrum (3x 1.25 Mhz channels) to give speeds of around 2-4 Mbps.
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This first phase of cdma2000 - variously called 1XRTT, 3G1X, or just plain 1X - is designed to double current voice capacity and support always-on data transmission speeds 10 times faster than typically available today, some 153.6 kbps on both the forward and reverse links.
Handset standby times also increase by up to 50%. Users will also be able to benefit from enterprise and consumer applications requiring more bandwidth, including personal information management, telemetry, corporate intranet access, video conferencing, gaming and music on demand.
The increase in voice and data capacity stems inter alia from advances in modulation algorithms, new IP backbones, and new chipsets that support up to 32 simultaneous users on a single chip, a four-fold increase over the previous generation.
While the cdma2000 specification allows for an evolutionary migration to later advances in cdma2000 that use core IP networks and voice-over-IP, the current 1X migration requires relatively modest hardware and software upgrades to existing cdmaOne infrastructure. Even then, operators can upgrade to 1X without having to implement it throughout their entire cdmaOne network, which means they can upgrade certain hotspots that require voice capacity enhancements or higher data speeds.
The strategy also aims to reduce technological risks by phased enhancements of networks with medium rate data services, and then later evolve to higher rate data services so as to avoid uncertainties of ROI that currently cloud the UMTS 3G vision.
cdma2000 can be deployed in existing spectrums such as 1900MHz along with an existing cdmaOne system, overlaying its new feature set and increased capacity on the existing cdmaOne networks. Most importantly, it uses existing (and paid for) 1.25 MHz spectrum.
Handsets using cdma2000 technology will also be backward compatible to the existing cdmaOne networks, so current handsets and features will operate over next generation networks providing continued access both at home and while roaming. Operators who deploy 3G with 1X will still have roaming with worldwide CDMA operators on their cdmaOne networks. Dual mode handsets that allow TDMA/cdma2000 interoperability may also augment the business case for a move by TDMA operators to cdma2000.
The flexible migration from cdmaOne provides a series of upgrades leading to cdma2000's increased voice capacity and Megabit 3G data rates, allowing each operator to upgrade when its individual market requirements dictate without significantly upgrading infrastructure or purchasing new spectrum.
:: cdma2000
:: cdma2000 1X-EV-DO
:: cdma2000 1X-EV-DV
:: cdma2000 3X
CDMA aficionados are rigorously promoting a technically benign upgrade of existing cdmaOne (IS-95) CDMA networks to faster cdma2000 technology, a CDMA 3G standard that they say can provide the same level of 3G service claimed by W-CDMA/UMTS promoters. There are various types of cdma2000 types, explained below.
--------------------------------------------------------------------------------
cdma2000 1X
The 1xEV specification was developed by the Third Generation Partnership Project 2 (3GPP2), a partnership consisting of five telecomnunications standards bodies: CWTS in China, ARIB and TTC in Japan, TTA in Korea and TIA in North America.It is also known as High Rate Packet Data Air Interface Specification. It delivers 3G-like services up to 140 kbps peak rate while occupying a very small amount of spectrum (1.25 MHz per carrier), protecting this precious resource for operators.
cdma2000 1X EV-DO
1X EV-DO, also called 1X-EV Phase One, is an enhancement that puts voice and data on separate channels in order to provide data delivery at 2.4Mbit/s. It was developed by the Third Generation Partnership Project 2 (3GPP2), a partnership consisting of five telecomnunications standards bodies. Also known as High Rate Packet Data Air Interface.
cdma2000 1X EV-DV
EV-DV, or 1X-EV Phase Two with promises of data speeds ranging from 3Mbps to 5Mbps. As many as eight proposals have been submitted to standards committee 3GPP2 for the design of EV-DV
cdma2000 3X
CDMA2000 3x is an ITU-approved, IMT-2000 (3G) standard. It is part of what the ITU has termed IMT-2000 CDMA MC. It uses 5 Mhz spectrum (3x 1.25 Mhz channels) to give speeds of around 2-4 Mbps.
--------------------------------------------------------------------------------
This first phase of cdma2000 - variously called 1XRTT, 3G1X, or just plain 1X - is designed to double current voice capacity and support always-on data transmission speeds 10 times faster than typically available today, some 153.6 kbps on both the forward and reverse links.
Handset standby times also increase by up to 50%. Users will also be able to benefit from enterprise and consumer applications requiring more bandwidth, including personal information management, telemetry, corporate intranet access, video conferencing, gaming and music on demand.
The increase in voice and data capacity stems inter alia from advances in modulation algorithms, new IP backbones, and new chipsets that support up to 32 simultaneous users on a single chip, a four-fold increase over the previous generation.
While the cdma2000 specification allows for an evolutionary migration to later advances in cdma2000 that use core IP networks and voice-over-IP, the current 1X migration requires relatively modest hardware and software upgrades to existing cdmaOne infrastructure. Even then, operators can upgrade to 1X without having to implement it throughout their entire cdmaOne network, which means they can upgrade certain hotspots that require voice capacity enhancements or higher data speeds.
The strategy also aims to reduce technological risks by phased enhancements of networks with medium rate data services, and then later evolve to higher rate data services so as to avoid uncertainties of ROI that currently cloud the UMTS 3G vision.
cdma2000 can be deployed in existing spectrums such as 1900MHz along with an existing cdmaOne system, overlaying its new feature set and increased capacity on the existing cdmaOne networks. Most importantly, it uses existing (and paid for) 1.25 MHz spectrum.
Handsets using cdma2000 technology will also be backward compatible to the existing cdmaOne networks, so current handsets and features will operate over next generation networks providing continued access both at home and while roaming. Operators who deploy 3G with 1X will still have roaming with worldwide CDMA operators on their cdmaOne networks. Dual mode handsets that allow TDMA/cdma2000 interoperability may also augment the business case for a move by TDMA operators to cdma2000.
The flexible migration from cdmaOne provides a series of upgrades leading to cdma2000's increased voice capacity and Megabit 3G data rates, allowing each operator to upgrade when its individual market requirements dictate without significantly upgrading infrastructure or purchasing new spectrum.
IMT-2000
In all, these technologies fall under the ITUs generic name of IMT-2000 (International Mobile Telecommunications 2000). But when the ITU tried to unify and standardise 3G technologies, no consensus was reached. There were thus five terrestrial standards developed as part of the IMT-2000 program. Instead, depending on where in the world 3G will be implemented, the 3G standard will be based on CDMA variants cdma2000 or W-CDMA.
CDMA (See our CDMA section)
The new 3G services are almost all flavours of technolgies based on the generic name, CDMA (Code Division Multiple Access). CDMA is a digital wireless technology that allows multiple users to share radio frequencies at the same time without interfering with each other. A telephone or data call is assigned a unique code that distinguishes it from others and and since the signals hop among different frequencies.
Current 2G services using the original CDMA "IS-95" technology are know as cdmaOne. 3G services will use new high-speed versions of CDMA called W-CDMA, or its competing technology, cdma2000. (More on CDMA)
Current 2G services using the original CDMA "IS-95" technology are know as cdmaOne. 3G services will use new high-speed versions of CDMA called W-CDMA, or its competing technology, cdma2000. (More on CDMA)
3G Overview
:: 3G Defined
3G (Third Generation) is a generic name for a set of mobile technologies set to be launched by the end of 2001 which use a host of high-tech infrastructure networks, handsets, base stations, switches and other equipment to allow mobiles to offer high-speed Internet access, data, video and CD-quality music services.
Data speeds in 3G networks should be show speeds of to up to 2 Megabits per second, an increase on current technology.
:: 2G/2.5G Defined
GSM for example is a 2G technology. It uses TDMA technology, proving data speeds of 9.6kbps/14.4kbps. The packet radio upgrade to GSM, called GPRS, can have speeds of up to 114kbps. GPRS an interim technology towards 3G, and hence is known as 2.5G. GSM might go the same way as the older first generation (1G) NMT and AMPS networks in 8-15 years because of the use of newer and better UMTS technology (More on GSM) ; (More on GPRS)
3G (Third Generation) is a generic name for a set of mobile technologies set to be launched by the end of 2001 which use a host of high-tech infrastructure networks, handsets, base stations, switches and other equipment to allow mobiles to offer high-speed Internet access, data, video and CD-quality music services.
Data speeds in 3G networks should be show speeds of to up to 2 Megabits per second, an increase on current technology.
:: 2G/2.5G Defined
GSM for example is a 2G technology. It uses TDMA technology, proving data speeds of 9.6kbps/14.4kbps. The packet radio upgrade to GSM, called GPRS, can have speeds of up to 114kbps. GPRS an interim technology towards 3G, and hence is known as 2.5G. GSM might go the same way as the older first generation (1G) NMT and AMPS networks in 8-15 years because of the use of newer and better UMTS technology (More on GSM) ; (More on GPRS)
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