© 2008 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

The Path to 4GApril 2, 2008

Kris Rinne

April 18, 2023Page 2

42.1%

18.0%

11.2%

9.2%

9.0%

6.5%

5.2%

3.3%

3.0%

Sent Text Message

Used Photo Messaging

Accessed Mobile Browser

Purchased Ringtone

Used Personal Email

Used Mobile Instant Messenger

Used Work Email

Downloaded Mobile Game

Purchased Wallpaper or Screensaver

Growth Drivers: Wireless Data Apps

Percentage of U.S. cell phone subscribers who used their phones for various activities beyond merely making phone calls.

Survey of U.S. Mobile subscribers; Data based on three-month average for period ending July 31, 2007.

Source: M:Metrics Inc.

April 18, 2023Page 3

Growth Driver: Video Customers

• 8.4 million mobile video subscribers 1Q07

• Penetration up 125% since 1Q06

Source: Telephia, FCC

April 18, 2023Page 4

Growth Drivers: Mobile Workforce

1.41

1.34

1.27

1.21

1.17

1.13

2004 2005 2006 2007 2008 2009

(in billions)

Mobile workforce is defined as anyone who spends 20% or more time away from primary work location.

Source: Industry Reports and Forrester 2006

April 18, 2023Page 5

Growth in Mobile Data Usage

62% of Americans have used Mobile Data

58% have sent an SMS, emailed or browsed the internet with their phone

41% have logged onto the Internet away from home or work either with a wireless laptop connection or a handheld device.

Source: Pew Internet & American Life Project, March 2008

April 18, 2023Page 6

Connectivity Drivers

Wireless Data Traffic (Mbps in millions)

2005 2006 2007

4 x between

’06 and ’07

April 18, 2023Page 7

HSDPA

HSUPA

HSPA

HSDPA+

LTE

April 18, 2023Page 8

Seamless Network Access:Continue Mobile Broadband Evolution

Perf

orm

an

ce

Time

Past Present Future

GPRS – 25 to 40 Kbps48 Kbps peak

EDGE – 100 to 130 Kbps237 Kbps peak

UMTS – 150 to 180 Kbps384 Kbps peak

HSDPA – 400 to 700 Kbps3.6 Mbps peak

HSUPA/HSPA – 500 to 800 Kbps up1.5 Mbps peak up (potential 5.76M)600 to 1400 Kbps down 3.6 Mbps peak down (potential 14.4M)

HSPA+ (R7) – MIMO, 64QAMPotential 11.5 Mbps peak upPotential 28 Mbps peak down

LTE (R8) – 100 Mbps and beyond peak down

Backward compatible migrationon the existing global standard

Today

Speeds are typical user throughput.

April 18, 2023Page 9

Mobility Assets: Faster Data Speeds

Technology Road Map

• Peak speeds today provide a DSL-like experience

• LTE is designed to evolve from HSPA

• With HSPA R7 peak speeds of up to 28 Mbps

• With LTE peak speeds beyond 100

Average Downlink Speedsby Technology(Kbps)

GPRS EDGE UMTSUMTS/

HSDPA R5UMTS/

HSPA R6

2005 2006 2007/2008

20042003 2009/2010

UMTS/HSPA+R7

25100 150

400

600

700

180130

40

1,400

28,000

1800

3600-7200

384237

48

April 18, 2023Page 10

GSM: 86% of World’s Wireless Users

200+ UMTS Operators

89 Countries with UMTS

164 Upgraded to HSPA

Unmatched international roaming capabilities

GSM Technologies Dominate Worldwide

Source: 3G Americas

April 18, 2023Page 11

Over 600 Million Wireless Broadband Connections in 2010

Source: Strategy Analytics Nov. 2006

HSPA 71%

EV-DO 24%

Mobile WiMax 2.5%

UMTS TDD 2.7%

Flash-OFDM 0.4%

iBurst 0.2%

April 18, 2023Page 12

Expand 3G Wireless Broadband Network

165

255

350

100

150

200

250

300

350

2006 2007 2008

Maj

or

Met

ros

April 18, 2023Page 13

466 HSPA Devices Available Worldwide

30

206

84

40

38

31

Handsets

Notebooks

Data Cards

USB Modems

Wireless Routers

Embedded Modules

Source: GSM Association

April 18, 2023Page 14

AT&T HSPA Devices Go International

PC CardsSierra

Wireless AC881

Option GT Ultra

Option GT Ultra Express

Sierra Wireless USBConnect

881

Smartphones/PDAs Blackjack II

SamsungAT&T Tilt

HTC

April 18, 2023Page 15

LTE Standards status January 2008

LTE Terrestrial Radio Access Network technology specifications have been approved by 3GPP and are now under change control, leading to their inclusion in the forthcoming 3GPP Release 8.

• Hardware impacting L1/L2 specifications functionally frozen for both FDD and TDD.

Full set of 3GPP Release 8 system specifications on track for approval during Q4 2008.

April 18, 2023Page 16

HSPA/LTE Peak Throughput Evolution:Expected to double every year in Average

100 kbps

1 Mbps

10 Mbps

100 Mbps

100 kbps

1 Mbps

10 Mbps

100 Mbps

2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

HSPA DL & UL Peak Throughputs expected to double every year in average

Limitations not induced by the Technology itself but time frames required to upgrade infrastructure and transport networks, obtain devices with corresponding capabilities and IOT tests

UL R’99 384k

HSUPA 2.0M

HSUPA 5.6M

HSUPA/16QAM 11M

UL LTE (10MHz) 25M

UL LTE (20MHz) 50M

DL R’99-384k

HSDPA 1.8M

HSDPA 3.6M

HSDPA 7.2M

HSDPA 14.4M

MIMO 2x2 28M

MIMO/64QAM 41M

DL LTE(10MHz) 140M

DL LTE(20MHz) 300M

April 18, 2023Page 17

LTE Mobility Advantages

AT&T will continue to utilize WiMAX for applications primarily focused on fixed

LTE Advantages for Mobility:

• Most customers, devices and applications

• Supports worldwide roaming

• Compatibility with existing AT&T Networks

• Designed to support efficient voice operation (VoIP)

April 18, 2023Page 18

LTE Mobility Advantages

• Shorter frame size, lower amounts of overhead, and lower overall latency than WiMAX

• LTE data throughput will be equivalent to or betterthan WiMAX when both are operated in FDD mode

• LTE shorter frame size supports higher throughputs at moderate to high vehicle speeds

April 18, 2023Page 19

HSDPA

HSUPA

HSPA

HSDPA+

LTE

© 2008 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

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