The document discusses CDMA2000 1xEV-DO Revision A, which improves data rates for mobile broadband services. Revision A increases forward link speeds to 3.1 Mbps and reverse link speeds to 1.8 Mbps, improving applications like VoIP and video calling. It also enhances quality of service through reduced latency and prioritization of different traffic types. These improvements allow CDMA2000 operators to offer new multimedia services that competitors won't be able to match for at least a year.

1. CDMA2000 1xEV-DO
Revision A
The Gateway to True
Mobile Broadband Multimedia
CDMA2000 1X, the world’s first
3G mobile system, changed the
face of cellular with functional,
money-making data services.
Only two years later, 1xEV-DO,
the world’s first mobile broadband
offering, was launched on CDMA
networks and high-speed data
services became available to
cellular users. Now the CDMA
community brings another first with
multimedia advancements that
will once again catapult CDMA
operators ahead of their competition

2. INTRODUCING 1xEV-DO REV. A . . . with data rates and quality
parameters that make applications like voice over Internet protocol (VoIP), video conferencing,
and real-time information sharing a gratifying reality for wireless users. Maintaining the CDMA
promise of backward compatibility and simple, cost-effective upgrades through channel cards and
software, 1xEV-DO Rev. A improves the wireless experience and enhances the way we communicate.
®
So CDMA2000 operators continue to attract the best customers in their markets, improve network
efficiency and strengthen their profitability. When will WCDMA and HSDPA offer these enhance-
ments? Not for another year at least.
INSTANT INFORMATION WITH BANDWIDTH SYMMETRY
CDMA2000 operators with 1xEV-DO have already rolled out data applications such as full music
downloads, web browsing, and streaming video. All of these applications work well with very high
speed on the forward link where the heavy information is flowing. The end-user requests data
(reverse link) and the system delivers it (forward link). Rev. A for 1xEV-DO
increases the speed on both links, with 3.1 Mbps on the forward and 1.8 Mbps
on the reverse. So CDMA customers can not only download, but also send
large files without delays.
Rev. A implements technology on the reverse link, called QPSK modulation,
that was previously only possible on the forward link. And the base stations
have four-branch receive diversity, which means four sets of received infor-
mation can be compared, in order to arrive at the clearest resulting signal,
despite any interference. Hybrid Automatic Repeat reQuest (H-ARQ) is also
implemented in both the forward and reverse link in Rev. A. To ensure that data arrives at the user
device correctly, the system automatically sends a replica of the data that has already been sent.
But with H-ARQ, the system can stop transmitting this redundant information and stop using system
resources once the initial data has been successfully decoded. Packet quantization provides 12
different packet size options in the reverse link, which means the system can choose the fastest
speed possible, given the strength of the signal over interference. Pilot interference cancellation
also contributes to the high speeds on Rev. A, since it allows the system to focus resources on the
users who need high speed and reduce interference from users communicating low amounts of data.
UNPARALLELED QUALITY OF SERVICE
Fast delivery of data both to and from users is only the first step. Quality of service (QoS) parameters
must be in place to manage high quality, two-way, live interactions of voice, video, music, and
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3. other forms of information without delays. Rev. A introduces these advanced parameters, which
ensure extraordinary quality and a positive user experience for new services.
Rev. A significantly reduces latency, or shortens the time it takes the data to make a round-trip
between the handset and network equipment. At well below 50 milliseconds, the average round-
trip takes less than half the time it took in earlier 1xEV-DO networks or in HSDPA networks, and
only one-tenth the time it takes on WCDMA networks. This is done by implementing H-ARQ and
by packaging the data into smaller packets. Packet prioritization is a feature that allows the network
to recognize and prioritize traffic based on the profile of the subscriber or the type of data being
sent. This feature improves efficiency and optimizes the way network capacity and bandwidth is
used. Multi-flow packet application allows an individual user to support multiple data sessions and
applications on the same device, by treating voice and video packets differently and applying quality
attention to the application that is more sensitive to delays. With these enhancements in place for
Rev. A, CDMA2000 operators can offer delay-sensitive services such as
VoIP, push-to-talk and video telephony on their networks, and begin offering
appealing applications to their customers that their competitors won’t be capable
of providing at the same level of quality for at least another year.
NEW TECHNOLOGY
Rev. A also incorporates OFDM technology, which allows for very high data
rates in the downlink utilizing only small portions of each 1.25 MHz carrier.
The method, called Platinum Multicast, enables one-to-many communications.
It gives operators control over system loading by scheduling the delivery of
content to many users on the network. Since multiple users are served simultaneously, the delivery
of content is efficient and cost-effective.
ENABLING NEW POSSIBILITIES IN
WIRELESS . . . Rev. A gives operators new revenue streams, lower costs and flexible
service management to outperform competitive technology offerings and maintain satisfied customers.
IMPROVED E-MAIL, WEB BROWSING AND MMS
Operators with CDMA2000 1X and 1xEV-DO networks have seen growth and widespread use of
data. Average monthly revenue for data users has been reported as high as four times that of
voice users and for some operators, data users make up over 40% of the total subscriber base.
The flow of data today is not only for Internet browsing and "receiving" of information; users are
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4. also sending information like PowerPoint files, photographs and video clips. The improved band-
width symmetry in Rev. A increases the speed and efficiency of the network for subscriber voice
and data activities, while quality parameters allow users to simultaneously surf the web and talk
on their device.
VOICE OVER INTERNET PROTOCOL (VoIP)
Rev. A improvements mean that operators can successfully offer voice communication through IP
lines which are considerably less costly. For a new operator, the total infrastructure investment is
significantly less – up to 30% in some cases – since traditional circuit-switching equipment is no
longer required. Both new and existing operators using VoIP with Rev. A gain significant increases in
voice capacity and offer new capabilities to their consumer and enterprise customers.
Video Telephony enables a user to share live video (data) . . . while discussing what she sees
(voice) . . . with one or more people . . . all at the same time. So business people can discuss
charts and data, journalists can report stories and police can confer with experts over visual evidence.
And consumers can share important moments like introducing a newborn baby
to his grandparents in another state or country. Or a shopper can get his
spouse's visual opinion on an expensive item prior to the purchase without a
second trip to the store.
Push-to-Connect (PTC) allows half-duplex (one-way-at-a-time) voice
communication to one or many users with the push of a button and Instant
Multimedia (IMM) extends that communication to provide text, pictures and
video. So users can share voice, video, text and pictures with multiple recipients
at a lower cost than video conferencing.
Online Gaming applications, some of which have been successfully rolled out over 1xEV-DO,
become more interactive with Rev. A, because now two or more people participating in an online
game can be talking at the same time. And with Rev. A, users have a better experience with the
more popular games, which require consistently low latency.
PLATINUM MULTICAST
With new Rev. A technology in place to provide better spectral efficiency, operators can now
broadcast information at rates three times faster than they could on their earlier 1xEV-DO Rel. 0
networks. Once operators understand what content is popular among their users, whether it's
news updates, sports scores or soap opera highlights, they can provide a preset schedule of
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5. programming and send information during off-peak hours to users "tuning in" to those programs.
The cost of delivery is considerably less with Rev. A, because in an instant, the data goes from one
(the operator) to many (the customers demanding that content). The use of OFDM technology offers
a faster and more capacity-efficient way of communicating the data. For the users, access to the
information is immediate, since when they request the content it is already resident on their device
and requires no downloading time.
SERVICE CONTROL
Since Rev. A networks recognize and prioritize traffic based on the profile of the subscriber or the
type of data being sent, operators have greater flexibility in how data is prioritized and delivered
on the network. So operators can use network resources efficiently and customers with different
tiers of service have a great communication experience.
DELIVERING CONTINUOUS
INNOVATION AND IMPROVEMENTS . . .
is the commitment that continues to be met with CDMA technology.
REV. B – BEYOND FAST
Rev. B is planned for commercial availability in 2007 and builds on the
efficiencies of Rev. A by dynamically allocating more radio spectrum for particular
locations, particular customers or particular applications to increase data
throughput. Any 1.25 MHz carrier or group of carriers can be used as needed
to support throughput as high as 200 Mbps in the forward link and 45 Mbps in the reverse link. The
system maintains its backward and forward compatibility with previous revisions of 1xEV-DO.
REV. C – THE ULTRA MOBILE BROADBAND
Rev. C is planned for commercial availability in 2008 and utilizes new technologies such as
OFDMA, SDMA and MIMO to achieve higher peak data rates (between 100 and 500 Mbps), extremely
low latency (around 10 milliseconds) and very high spectral efficiency. The technology has a flexible
and dynamic mode of operation to combine and allocate spectrum as needed to support a large
variety of user applications and activities. So CDMA operators continue to reduce costs while offering
leading edge capabilities to their users. And the user experience continues to improve, with fast,
easy access and delivery of information, a wide selection of devices to fit individual lifestyles and
increased battery life of user devices for true freedom in mobility.
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© Copyright 2006 CDG Development Group • All rights reserved • CDMA2000 is a trademark of the Telecommunications Industry Association.