AT&T Labs November, 1999doc.: IEEE 802.11-99/251 Slide 1Submission Harry Worstell, AT&T Labs 802.11-Based Wireless Technology to Enhance Premises Voice

AT&T Labs

November, 1999 doc.: IEEE 802.11-99/251

Slide 1Submission Harry Worstell, AT&T Labs

802.11-Based Wireless Technology

to Enhance Premises Voice and Data Services

AT&T Labs



1996 Congress passed the Telecommunications Act, Long distance carriers permitted local access again

1996-1999 Local exchange companies block long distance carriers access to their lines

1998 AT&T purchased Tele-Communications Incorporated

1999 AT&T purchased Media1

AT&T to Provide Local Broadband Access

AT&T Labs



Rewiring the home for broadband distribution is very expensive and irritates customers

Now having broadband pipes to the edge of the home, it is necessary to extend those pipes into and through the home.

With these cable acquisitions and other broadband access methods, AT&T anticipates being able to offer broadband

service to ~2/3 of the U.S households over the next 4 - 5 years.

Wireless is an extremely attractive solution for premises broadband distribution

AT&T to Provide Local Broadband Access

AT&T Labs



ACCESSPORT

ETHERNET

CABLE M O DEM

Cable Television Headend

Hub

ETHERNET

CALL AG ENT

C M T SDNS

DHCP

Eth

erne

t

To Network

CABLE M O DEM

RJ11

InternetSurfing

Client P ort

Custom ers Hom e

Stream ingVideo

Client P ort

Streaming VideoLaptop Computer

Client P ort

C lient P ort

C lient P ort

C lient P ort

A Wireless Access Application

AT&T Labs



AT&T Labs



Data Communications Trends

Projected Volumes For Wide Area Communications In US By Type Of Traffic, 1994-2005

Source: IDC, AT&T Labs, Geopartners Analysis

Post Year 2000: “Transition from a voice focused network supporting data,to a data focused network supporting voice”

0

200

400

600

800

1000

1994 1996 1998 2000 2002 2004

Data

Voiceband - Voice, Fax & Modem

Average BandwidthGbits /Sec

AT&T Labs



Spanof Coverage

for ViableEconomics

ServiceInformation Rate

Demand

ServiceConcentration

Local(In-Building/

Campus)10,0001,000100101

(Miles)

1000

100

10

1

(Erlangs/Mi )

10M

1M

100K

10K

1K

(Bits/s)

2

Public(Neighborhood/

Urban)

Mobile(Suburban/Rural) Regional

Expansion of demand for wireless serviceshas caused migration of systems toward: Higher Teledensities Better Communication Quality More Throughput/User

2000+

1990's

1980's

1970's

Wireless Service Trends

AT&T Labs



Phase I(1997)

Phase III(2000+)

Phase II(1998)

Unified Broadband Wireless Access

Burstiness

Isochronous(Continuous Transmission,

Constant Low Delay)

Asynchronous(Bursty Transmission,

Load-Dependent, VariableDelay )

Ma

xim

um

Th

rou

gh

pu

t(M

b/s

ec)

.1

1

10

100

0 .5.01

Wireless Local LoopFree-Space Optics

1

Phase 0(Pre-1997)Cellular

W-ISDN

CDPD

H/S W-LAN

W-LAN

MultimediaSatellite

Future Multimedia / Wireless Technology Convergence

AT&T Labs



Transport Networksand Interfaces

HumanInterfaces

AccessMediation

VHF/UHF/MicrowaveRadio Subsystems

DigitalProcessing

EnergySystems

Antennas

Semiconductor& Freq ControlDevices

Unified Broadband Communications

Accommodation of RF BehaviorCellular Reuse ArchitecturesEarly Cellular/Cordless, T/R Phones

Management of RF Behavior,Separate System SolutionsAnalog Cellular/Cordless, ISDN

Adaptation to RF Environment,Merged Public/ PrivateMulti-Mode Systems,, EthernetDigital Cellular/ Wireless LANs

(1979-1985)

1986-1992

(1993-1997)

Packet Protocols

Integration of Wireless//Wired Services, MultimediaMulti-Access Terminals

(1998-2002)

(2003-2008)Unified Modulation,Coding, Formats

Service-TransparencyWired/Wiireless

AdvancedCoding

Unified Broadband Communications for outdoor and indoor use is a fusion of key technologies---Some are developing, others emerging...

The maturity of the various technologies dictates intermediate solutions whose capabilities satisfy the user service value judgment (cost, utility) at a particular point in time.

Technology “Superhighway On-Ramps” for Communications Networks

AT&T Labs



1 3

5

7

6

9

0

2

8

Multifunctional Communicators

4

* #

Rcl Sto Clr

Pwr Vol End

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Wireless =

Central Theme

Wireless = Part of

Service "Bundle"

Handset +

Radio

Handset +

Modem +

Messaging Pager +

Conferencing Tool +

Computer +

Data Bank +

Remote Control +

Radio

New system environments and service demands have spurredfundamental architectural and technological progress:

Wireless “Y2K” Megatrends

AT&T Labs



Voice

Data

Distinct Media Typesw/Special Wireless Coding

ComputerData

NetworkAddressing

Video

ImageMultimedia SourceCoding Same asWired Network

Wired-Network Compatible Source Coding



AT&T Labs





DataData In = Data Out,Improved Error Control

Data

Data

InterferenceNoise

Blocking

Data

Wireless Connections Equivalent to Wired

AT&T Labs





Narrow Voice-RateData Pipe

More Bits/Hz

in Multipath

Environment

Higher Radio Frequencies,

Wider Channel BW

Wide

All-Purpose

Pipe

Wide-Bandwidth Wireless Connections

AT&T Labs



AnalogFront-End(Band 1)

AnalogBack-End(IF BW 2)

Digital ChannelProcessing

(Std 2)




(Std 1)




(Std 3)

General-Coverage RadioTechnology

Unique Radio Design for

Each Radio Service

Band-AgileFront-End

Single Radio

Platform Design

for Multi-Band,

Multi-Mode Use

Multi-Band, Multi-Mode Radio Equipment

Wireless “Y2K” MegatrendsNew system environments and service demands have spurredfundamental architectural and technological progress:

AT&T Labs



Wireless “Y2K” MegatrendsNew system environments and service demands have spurredfundamental architectural and technological progress:

Distributed-Intelligence Wireless Networks

Distributed Adaptive Wireless

Network Processing & Control

Centralized Wireless

Network Processing & Control

Wire

d N

etw

ork

MT

SO

AT&T Labs





Capacity/Quality Increases Via Adaptive Antennas

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Antenna Processor

AdaptiveArray Antennasfor MaximizedFrequencyRe-Use

Omni or SectorAntennas inCenter or Edge-Excited Cells

"Beams"Replace"Cells"

R/T R/T R/T R/T R/T

AT&T Labs





Circuit-Switching

Packet-Switching

Switched-Circuit and Packet Mode Depending on Media

AT&T Labs





Open Interfaces

SS7

Closed Proprietary

Architectures

H323

CTI

IEEE802.11

MGCP

Open Interfaces Required

AT&T Labs



Although easy to install, W-LANs provide spot coverage, withoutthe range, reuse, contiguous coverage, and isochronous traffic-handling benefits characteristic of cellular CAIs and networkarchitectures.

W-LAN Radio Access PointsRouter

PacketNetwork

Current Indoor Wireless LANs

AT&T Labs



Peer/Peer and Client/Server Small User Population Isolated "Cells" and User Groups Non-Contiguous Coverage Indoor Operation Limited Mobility Mostly Asynchronous Traffic Slower than Ethernet

A

A

A

Today’s Wireless LANs

InterNet/IntraNet Ethernet-Compatible Speeds Multiple RF Bands to operate

Second-Generation Wireless LANs

A

C

BA

Larger User Population Full Roaming/Handoff Capability Contiguous Coverage in Dense Areas Wider Area Coverage for Community LANs Mobility (Follow-Me Service) Mix of Async and Isochronous Traffic Higher System Utilization Enhanced Security

IEEE 802.11Fourth-Generation ofWireless Communications

Third-Generation Wireless Communications•TDMA•EDGE•Wideband CDMA

Indoor Wireless LANs Migration

AT&T Labs



Enhanced IEEE 802.11 MAC

Present 802.11 MAC Enhanced 802.11 MAC

AT&T Labs



For the past several years, AT&T Labs has been evaluating and developing hardware and software platforms. These platforms evaluate:

•Enhanced network solutions based on extensions to the IEEE 802.11 Standard

• Mixed and simultaneous Isochronous / Asynchronous traffic management

Full Roaming/Handoff Capability

Contiguous Coverage in Dense Areas

Wider Area Coverage for Community LANs

Mobility (Follow-Me Services)

Higher System Utilization

• Enhanced security

All while maintaining the Quality-of-Service that the AT&T brand is noted

Ongoing Labs Efforts

AT&T Labs



Managing Multimedia Content and Throughput

Unified Protocol/MAC

The packet communication challenge: how to provideconcentration of users with various media, preserving QOS...

FDMA, TDMA, CDMA Packet (ALOHA, PRMA, etc.)

Reservation Techniques(Circuit-Switched, Control at Base)

Contention Techniques(Packet-Switched, Control at User and Base)

Knowledge base and modeling of access methods are fundamental to engineering asystem which optimizes cost, system capacity, data latency, frequency use, etc.

Hz

1

2

3

4

1234

1 2 3 4

56

5 6

Time

1,2,3,4,5,6

Time Time

431

42 3

0 1 e e 1FB

Reserved

Contending

FB

1 423

Frame

e 1 1 e21 1

1 4

35

Frame

UserUserUserUserUserUserChannel

ChannelChannelChannelChannelChannel

Slot Slot Slot Slot

Slot SlotSlot

42

e

Slot Slot Slot Slot Slot Slot Slot SlotSlot Slot

Frame

Channel

A set of users (transmitters) wish to communicate with a radio node or coaxial head-end facility (receiver)Users must share a communication channel

Problem: How to coordinate channel usage by the users so that the channel is used efficiently?

e1

Mini-Slots Bearer-SlotsMini-Slots for Payload Management

Synchronous Media ReservationsAsynchronous Media Contention ResolutionSignaling and System Control

Bearer-Slots for Payload Communication

AT&T Labs



Merging of Wired & Wireless

The

Future.....

Telephony, Multimedia, Paging, High Speed Internet/Intranet Services

AT&T Labs



Conclusion

We at AT&T Labs support the IEEE 802.11 study group in their efforts to enhance the Standard with respect to adding extensions to the MAC and move the Standard to a 4th Generation Standard that includes a wireless networking solution.

We encourage the Study Group / Working Group to look at enhancements that provides true network based solutions that will support simultaneous Multimedia, Telephony, Streaming Video, and High Speed Internet / Intranet access with a cellular like CAI and enhanced security.

We are pleased to be a participant in the IEEE 802.11 committee and hope to continue to contribute to and support the efforts of the IEEE 802.11 Standards Committee and this Study Group.

AT&T Labs



Documents

AT&T Labs November, 1999doc.: IEEE 802.11-99/251 Slide 1Submission Harry Worstell, AT&T Labs 802.11-Based Wireless Technology to Enhance Premises Voice