Transcript (presenting) and Cortney Martin - Edward A. Fox

US-Korea Joint Workshop on
Digital Libraries
SDSC - August 10-11, 2000
Broadband Wireless Networking in
Rural Virginia
Case study: Blacksburg
Edward A. Fox and Cortney Martin
Virginia Tech, Blacksburg, VA, USA
The Problem
Applications such as digital libraries, distance learning,
telemedicine, video streaming, videoconferencing, and the eeconomy are dependent on next generation broadband networks.
But these applications hit a bottleneck at most offices and homes.
High Capacity
Backbone
Network
Modem, DSL,
Cable Modem
Largely copper
and coax
#2
Connectivity Options
• Dial-up Modems
• xDSL - limited availability, constraints on
distance from CO.
Bandwidth
Affordability
• Cable Modems- shared medium limits avail.
bandwidth, not available to most businesses.
• Satellite – one way, uses telephone return; not
good for serving information.
• Leased lines
• Direct Fiber – limited availability
#3
One Solution is Broadband Wireless,
or LMDS
• Local Multipoint Distribution Service
– A “Last Mile” communication solution
– 1150 MHz of licensed microwave frequency in 28-31
GHz range
– A broadband wireless alternative to fiber, copper or coax
– Will remove the bottlenecks between advanced
communication networks and the home and office
– More than twice the bandwidth of the combined total of
radio, broadcast television, and cell telephone
– Throughput of 10 Gbps (10,000 Mbps)
#4
Virginia Tech Won Four A Block Licenses in the 17th
FCC Spectrum Auction
BTA
Bristol
Danville
Martinsville
Roanoke
total
pop
sq miles
698,000
171,000
92,000
644,000
1,605,000
6,207
2,280
881
7,139
16,507
40% of the
area of
Virginia
LMDS offers a LOT of bandwidth
(comparison to previous auctions)
LMDS
MMDS
DBS
PCS A-C Block
LMDS is:
- 1300 MHz in two “Blocks” ( 28-31 GHz)
- Over 2X bandwidth of AM/FM radio,
VHF/UHF television, and Cellular telephone
combined.
- More than sum of previous 16 auctions
Cellular Unserved
Digital Audio Radio Service
PCS D-F Block
Wireless Communications Service
Interactive & Video Data
0
200
400
600
MHz
800
1000
1200
#6
LMDS is just another
access medium and
can be used for voice
data or video
A network can be made
up of any combination
of point-to-point
wireless, point-tomultipoint, and
wireline solutions
Images from www.wavtrace.com
Advantages of LMDS
•
•
•
•
•
Fast to deploy, no digging roads
Solution to lack of fiber in some rural areas
Build-out on demand, scalable
Multi-Gigabit capacity
Can provide integrated services: voice/data/video
Challenges
• Requires “line of sight” between Tx and Rx
• Signal attenuation by rain and moisture in vegetation
• Shorter range requires more hub sites for coverage
#8
Multi-disciplinary Team is Working to Solve
the Problems
• Information Systems
– Communications Network Services
– Digital Library Research Laboratory
Operational Deployments,
Community Outreach
• Academic Departments & Research Centers
– Center for Wireless Telecommunications
– Space and Wireless Business Center (SAWBUC)
• Virginia Tech Foundation
Engineering and Business
Research
• Area Communities
#9
Virginia Tech and Wavtrace
Deployed an LMDS Testbed in
Blacksburg, VA
• First deployed in May, 1999 - First TDD system, first rural
deployment
• Wavtrace Point-to-Multipoint wireless SONET supports N x
T1 at remote sites
• Typical services include Ethernet/IP and T1 channels for
Internet/Intranet access; analog voice lines; VoIP; streaming
video; H.323/MPEG-2 videoconferencing
• Wavtrace next generation system uses wireless ATM to
support up to 180 Mbps per carrier
#10
Blacksburg LMDS Deployment March 2000
(Hub, 3 beams, 8 remotes; serving offices, apartments, ISPs)
Area: 19 sq miles
Pop: 36,000
Viewshed From LMDS Hub
#12
LMDS Hub Site at Slusher Hall
Wavtrace Tower 1
Wavtrace Tower 2
Radio Hut
#13
Hub Indoor Equipment at Slusher Radio Hut
OC3 link to MSAP
Net Mgmt Ports
#14
Remote outdoor equipment can be mounted in a variety of ways
Slusher Tower
#15
Apartment Owners Want Obscure Antennas
Wavtrace Remote TRA
#16
Weather data is collected at several sites
• Signal attenuation due to
rainfall continues is of interest
to the industry
• Rain cells are typically small
• Station tracks:
–
–
–
–
Outdoor temperature
Indoor temperature
Wind speed and direction
Rainfall
http://remote1.lmds.vt.edu/weather.htm
#17
Temporary Indoor Equipment Configuration
Adtran T1 CSU/DSU/Voice Mux
Baytech Remote Controller
Cisco 2621 Router
3COM Ethernet Hub for Mgmt
Wavtrace Indoor Unit
#18
Experience with LMDS
• Quick to deploy (enables service provider to capture
customers before a competitor does)
• Build-out, or relocate, as needed
• Useful for sites not readily accessible to other broadband
services
• Signal loss due to rain must be compensated for
• Operation, Administration, Maintenance, and
Provisioning is similar to other telecomm. equip.
#19
Ways to Profitability?
• Provide good performance and reliability
• Create an MSAP for local high speed peering,
collocation, and content services
• Bundle and/or integrate voice, data, and video
services–partner if needed
• Make use of fiber, twisted-pair, coax, and other
media, in addition to wireless, where effective
#20
LMDS Connects to Blacksburg MSAP
(Multimedia Service Access Point)
Network
InternetVA /
Internet
Community
MSAP Management • Facility for local peering and
Local
ISP
Content
IP
Routing Directory
Security
Local NAP
Cache
Fiber
Local
ISP
•
CollegeUniv.
•
Local
Businesses
•
Local
Schools
Wireless
LMDS
Local
Government
Local
Businesses
•
collocation of broadband
network and appl. services
Reduces cost for service
providers by reducing need for
higher tier Internet capacity
Improves network performance
by removing Internet bottlenecks
Facilitates broadband
applications (e.g., VoIP, music,
video on demand, home office,
distance learning)
Makes customers happy!!!
Eventually LMDS could be used in combination with other
wireless and wireline technologies to reach individual homes
There is a great deal of interest in LMDS in rural
SW Virginia and planning for deployments is
underway by CNS and CWT
Floyd County
Smyth County
#23
For more information:
www.lmds.vt.edu
[email protected]
Cortney Martin
Communications Network Services