Transcript New system environments and service demands have

November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
802.11-Based Wireless
Technology
to Enhance Premises
Voice and Data Services
Submission
Slide 1
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
AT&T to Provide Local Broadband Access
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
Submission
Slide 2
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
AT&T to Provide Local Broadband Access
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.
Now having broadband pipes to the edge of the home, it is
necessary to extend those pipes into and through the home.
Rewiring the home for broadband distribution is very
expensive and irritates customers
Wireless is an extremely attractive solution for premises
broadband distribution
Submission
Slide 3
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
A Wireless Access Application
Cable Television Headend
CALL AGENT
CMTS
ETHERNET
DNS
Ethernet
DHCP
Hub
To Network
Streaming Video
Laptop Computer
Customers Home
ETHERNET
Client Port
ACCESS
PORT
Client Port
CABLE MODEM
Client Port
Client Port
Client Port
Internet
Surfing
Streaming
Video
RJ11
Client Port
CABLE MODEM
Submission
Slide 4
Harry Worstell, AT&T Labs
November, 1999
Submission
doc.: IEEE 802.11-99/251
AT&T Labs
Slide 5
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Data Communications Trends
Post Year 2000: “Transition from a voice focused network supporting data,
to a data focused network supporting voice”
Average Bandwidth
Gbits /Sec
1000
800
600
Data
400
Projected Volumes For Wide Area
Communications In US By Type Of
Traffic, 1994-2005
200
Voiceband - Voice, Fax & Modem
Source: IDC, AT&T Labs, Geopartners
Analysis
0
1994
Submission
1996
1998
Slide 6
2000
2002
2004
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless Service Trends
Service
Information Rate
Demand
(Bits/s)
1M
10M
100K
10K
Public
Local
(Neighborhood/
(In-Building/
1K
Urban)
Campus)
2000+
Mobile
(Suburban/Rural)
1
10
100
Span
of Coverage
for Viable
Economics
(Miles)
Regional
1,000
10,000
1
1970's
1990's
10
1980's
100
1000
Service
Concentration
2
(Erlangs/Mi )
Submission
Expansion of demand for wireless services
has caused migration of systems toward:
Higher Teledensities
Better Communication Quality
More Throughput/User
Slide 7
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Future Multimedia / Wireless Technology Convergence
Phase III
(2000+)
100
WAT
M
Wireless Local Loop
Free-Space Optics
P
S D
OL U
OC v4
OT P/IP
PR TC
W-ISDN
.1
.01
CDPD
.5
(Continuous Transmission,
Constant Low Delay)
Burstiness
Submission
Phase I
(1997)
W-LAN
Cellular
0
Isochronous
H/S W-LAN
v6
1
Phase II
(1998)
P
V.3ROT
2 OC
W- OLS
ISD
N
10
Multimedia
Satellite
IP
Maximum Throughput
(Mb/sec)
Unified Broadband Wireless Access
Slide 8
Phase 0
(Pre-1997)
1
Asynchronous
(Bursty Transmission,
Load-Dependent, Variable
Delay )
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Technology “Superhighway On-Ramps” for Communications Networks
Service-Transparency
Wired/Wiireless
Packet Protocols
Integration of Wireless//Wired
Services, Multimedia
Multi-Access Terminals
Human
Interfaces
Adaptation to RF Environment,
Merged Public/ Private
Multi-Mode Systems,, Ethernet
Digital Cellular/ Wireless LANs
Transport Networks
and Interfaces
Management of RF Behavior,
Separate System Solutions
Analog Cellular/Cordless, ISDN
Access
Mediation
Accommodation of RF Behavior
Cellular Reuse Architectures
Early Cellular/Cordless, T/R Phones
Unified Broadband Communications
(2003-2008)
(1998-2002)
Advanced
Coding
(1993-1997)
Antennas
Energy
Systems
1986-1992
Digital
Processing
(1979-1985)
VHF/UHF/Microwave
Radio Subsystems
Submission
Unified Modulation,
Coding, Formats
Slide 9
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.
Semiconductor
& Freq Control
Devices
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
1
3
5
6
9
7
0
Wireless =
Central Theme
Handset +
2
Modem +
8
Messaging Pager +
Conferencing Tool +
Computer +
Data Bank +
4
*
#
Rcl
Pwr
Sto
Vol
Clr
Remote Control +
End
Radio
Handset +
Radio
Graph 1
EasyLink Enabled...
Dial> 201 555 3000
Dialing...
Connected...
login: rrm
Wireless = Part of
Service "Bundle"
Multifunctional Communicators
Submission
Slide 10
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Distinct Media Types
w/Special Wireless Coding
Voice
Computer
Data
Network
Addressing
Data
Video
Image
Multimedia Source
Coding Same as
Wired Network
Wired-Network Compatible Source Coding
Submission
Slide 11
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Interference
Noise
Blocking
Data
Data
Data
Data
Data In = Data Out,
Improved Error Control
Wireless Connections Equivalent to Wired
Submission
Slide 12
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Narrow Voice-Rate
Data Pipe
More Bits/Hz
in Multipath
Environment
Higher Radio Frequencies,
Wider Channel BW
Wide
All-Purpose
Pipe
Wide-Bandwidth Wireless Connections
Submission
Slide 13
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Unique Radio Design for
Each Radio Service
Analog
Analog
Digital Channel
Back-End
Front-End
Processing
(IF BW 1)
(Band 1)
(Std 1)
Analog
Analog
Digital Channel
Back-End
Front-End
Processing
(IF BW 2)
(Band 1)
(Std 2)
Analog
Analog
Digital Channel
Front-End
Back-End
Processing
(Band 2)
(IF BW 3)
(Std 3)
Single Radio
Platform Design
for Multi-Band,
Multi-Mode Use
Band-Agile
Front-End
General-Coverage Radio
Technology
Multi-Band, Multi-Mode Radio Equipment
Submission
Slide 14
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Centralized Wireless
Wired Network
MTSO
Network Processing & Control
Distributed Adaptive Wireless
Network Processing & Control
Distributed-Intelligence Wireless Networks
Submission
Slide 15
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Omni or Sector
Antennas in
Center or EdgeExcited Cells
Adaptive
Array Antennas
for Maximized
Frequency
Re-Use
Graph 1
EasyLink Enabled...
Dial> 201 555 3000
Dialing...
Connected...
login: rrm
Graph 1
EasyLink Enabled...
Dial> 201 555 3000
Dialing...
Connected...
login: rrm
Graph 1
EasyLink Enabled...
Dial> 201 555 3000
Dialing...
"Beams"
Replace
"Cells"
Connected...
login: rrm
R/T
R/T
R/T
R/T
R/T
Antenna Processor
Capacity/Quality Increases Via Adaptive Antennas
Submission
Slide 16
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Circuit-Switching
Packet-Switching
Switched-Circuit and Packet Mode Depending on Media
Submission
Slide 17
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Wireless “Y2K” Megatrends
New system environments and service demands have spurred
fundamental architectural and technological progress:
Closed
Proprietary
Architectures
Open Interfaces
SS7
H323
CTI
IEEE802.11
MGCP
Open Interfaces Required
Submission
Slide 18
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Current Indoor Wireless LANs
Although easy to install, W-LANs provide spot coverage, without
the range, reuse, contiguous coverage, and isochronous traffichandling benefits characteristic of cellular CAIs and network
architectures.
Packet
Network
Router
W-LAN Radio Access Points
Submission
Slide 19
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Indoor Wireless LANs Migration
Today’s Wireless LANs
A
A
A
 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
IEEE 802.11
Fourth-Generation of
Wireless Communications
 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
A
C
B
Second-Generation Wireless LANs
A
 InterNet/IntraNet
 Ethernet-Compatible Speeds
 Multiple RF Bands to operate
Third-Generation Wireless Communications
•TDMA
•EDGE
•Wideband CDMA
Submission
Slide 20
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Enhanced IEEE 802.11 MAC
Present 802.11 MAC
Submission
Enhanced 802.11 MAC
Slide 21
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Ongoing Labs Efforts
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
Submission
Slide 22
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
Managing Multimedia Content and Throughput
The packet communication challenge: how to provide
concentration of users with various media, preserving QOS...
A set of users (transmitters) wish to communicate with a
2
radio node or coaxial head-end facility (receiver)
Users must share a communication channel
3
1
Problem: How to coordinate channel usage by the users
so that the channel is used efficiently?
4
Reservation Techniques
Contention Techniques
(Circuit-Switched, Control at Base)
(Packet-Switched, Control at User and Base)
FDMA, TDMA, CDMA
Packet (ALOHA, PRMA, etc.)
Fra me
4
e
2
Slot Slot Slot Slot
Hz
Channel
Channel
Channel
Channel
Channel
Channel
U se r 6
U se r 5
U se r 4
U se r 3
U se r 2
U se r 1
Time
Fra me
Slot Slot Slot Slot Slot
1 ,2,3,4,5,6
5
1
6
2
3
Time
Time
1
Channel
4
FB 0
4
1
3
1
e
4
2
e
3
1
Fra me
Slot Slot Slot Slot Slot SlotSlot Slot
e
1
4
1
1
2
3
e
2
1
1
Reserved
4
1
5
3
e
Contending
FB
Knowledge base and modeling of access methods are fundamental to engineering a
system which optimizes cost, system capacity, data latency, frequency use, etc.
Unified Protocol/MAC
Mini-Slots
Mini-Slots for Payload Management
Synchronous Media Reservations
Asynchronous Media Contention Resolution
Signaling and System Control
Bearer-Slots
Bearer-Slots for Payload Communication
Submission
Slide 23
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
AT&T Labs
The Future.....
Merging of Wired & Wireless
Telephony, Multimedia, Paging, High Speed Internet/Intranet Services
Submission
Slide 24
Harry Worstell, AT&T Labs
November, 1999
doc.: IEEE 802.11-99/251
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.
Submission
Slide 25
Harry Worstell, AT&T Labs
November, 1999
Submission
doc.: IEEE 802.11-99/251
AT&T Labs
Slide 26
Harry Worstell, AT&T Labs