cognitive radio & the whitespace revolution a new zealand perspective
TRANSCRIPT
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Cognitive Radio & The Whitespace Revolution
A New Zealand Perspective
Sponsored in part by
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Waikato Region: Population 416,000Density: 1-4000 per sq km
Wikimedia Commons ImageUser: Vardion
<11510501002505007501000200030004000
|---- 20km ----|
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Lower Population Density Higher
Cost
/Com
plex
ity
Fibre
Wireless
Satellite
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Waikato Region: Population 416,000Density: 1-4000 per sq km
Wikimedia Commons ImageUser: Vardion
<11510501002505007501000200030004000
|---- 20km ----|
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Summary:Terrestrial broadbandonly economic for<50 people / km2
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Image Credit: http://commons.wikimedia.org/wiki/User:Dschwen
New Zealand invests $300M in Rural Broadband 2011-2016
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45,000 households in New Zealandare still economically excluded.
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What can we do to make broadband more economic for <50 people / km2 ?
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Radio Spectrum
Electromagnetic Spectrum10Wednesday, 27 February 13
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Not All Spectrum is EqualFr
eque
ncy
2.4GHz: Wi-Fi2.1GHz: 3G1.8GHz: 2G & LTE900MHz: 3G700MHz: LTE500-700MHz: UHF Television100MHz: Radio
Grea
ter P
enet
ratio
n
Ante
nna S
ize
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Radio Licensing
Regional
National Link
Area12Wednesday, 27 February 13
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Rural Fixed Wireless Coverage 201713Wednesday, 27 February 13
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We’re doing it wrong.
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The Electrospace Model* of Radio Spectrum Reflects The Reality of Modern Radio Applications.
See Matheson (2011)“The Technical Basis for Spectrum Rights:
Policies to Enhance Market Efficiency”
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Electrospace
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Where & when there’s no signal in an Electrospace, we have Whitespace.
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UHF TV Coverage AreaWhitespace
Whitespace: A Simple Example18Wednesday, 27 February 13
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Typical TV Broadcast Configuration
Tower A:Ch: 1,3,5,7,9
Tower B:Ch: 2,4,6,8,10
TVWS:2,4,6,8,10
TVWS:1,3,5,7,9 TVWS:
ALL
X Y Z
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How does this look to aSpectrum Analyser?
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Wellington, New Zealand UHF Broadcast Spectrum, 30-08-11
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Wellington, New Zealand UHF Broadcast Spectrum, 30-08-11
W
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Wellington, New Zealand UHF Broadcast Spectrum, 30-08-11
W HI
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Wellington, New Zealand UHF Broadcast Spectrum, 30-08-11
W HI T E S P A C
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Wellington, New Zealand UHF Broadcast Spectrum, 30-08-11
W HI T E S P A C E
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Wellington’s Not SpecialIt’s Like That Everywhere
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Why are we not using Whitespace right now?
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How can we use whitespace without breaking existing services?
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How can we use whitespace without breaking existing services?
Cognitive Radio
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Cognitive RadioAwareAdaptsSensesInteracts
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And it’s real.
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IEEE 802.22 is the first Wireless Regional Area Networking standard.
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IEEE 802.22 delivers fixed wireless broadband using Cognitive Radio in TV Whitespace Spectrum
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IEEE 802.22Protects Primary Users
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IEEE 802.22Protects Primary Users
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IEEE 802.22Protects Primary UsersUsing Geolocation & Spectrum Databases
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IEEE 802.22Protects Primary Users
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IEEE 802.22Protects Primary UsersUsing Geolocation & Spectrum Databases
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IEEE 802.22Protects Primary UsersUsing Geolocation & Spectrum DatabasesAnd Spectrum Sensing
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So how doesIEEE 802.22compare?
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802.22 Channel Size: 6MHz
0
10
20
30
40
802.11 802.16 802.22 WCDMA LTE
MHz
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802.22 Spectral Efficiency
0
5
10
15
20
802.11g 802.16 802.22 WCDMA LTE
bits p
er Hz
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Spectrum Availability
0
75
150
225
300
TVWS 700MHz 900MHz 1800MHz 2100MHz 2.4GHz
MHz
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What AboutIn Real Life?
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Wi-Fi vs TVWS Community Studies
Three Rural New Zealand CommunitiesModeled with Awe WinProp at 25MSame Emitted Power for Both Technologies
(4 Watts EIRP)Like for Like Subscriber Antenna Sizes
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Parikino, Whanganui River Valley
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Parikino AreaWhanganui River Valley
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Parikino on Wi-Fi: 18 Houses Ok41Wednesday, 27 February 13
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Parikino on TVWS: 28 Houses Ok42Wednesday, 27 February 13
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Cognitive Radio inTV Whitespace
Has Real Potentialfor Rural Broadband
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It changes the economics of rural wireless
TVWS
2 pax / km2
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Trials are on inSingapore, UK, US. Expect hardware in
2-3 years
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Paper available:
http://tinyurl.com/bph5amfor
https://internetnz.net.nz/system/files/pages/2012/telco2_whitespace_study_community_examples_final.pdf
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Thank You!
Sponsored in part by
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