Cognitive Radio & The Whitespace Revolution. A New Zealand Perspective

Transcription

1 Cognitive Radio & The Whitespace Revolution A New Zealand Perspective Sponsored in part by 1

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4 < km ---- Wikimedia Commons Image User: Vardion Waikato Region: Population 416,000 Density: per sq km 3

5 Cost/Complexity Satellite Wireless Fibre Lower Population Density Higher 4

6 < km ---- Wikimedia Commons Image User: Vardion Waikato Region: Population 416,000 Density: per sq km 5

7 Summary: Terrestrial broadband only economic for <50 people / km 2 6

8 New Zealand invests $300M in Rural Broadband Image Credit: 7

9 45,000 households in New Zealand are still economically excluded. 8

10 What can we do to make broadband more economic for <50 people / km 2? 9

11 Radio Spectrum Electromagnetic Spectrum 10

12 Not All Spectrum is Equal 2.4GHz: Wi-Fi Frequency 2.1GHz: 3G 1.8GHz: 2G & LTE 900MHz: 3G 700MHz: LTE MHz: UHF Television Greater Penetration Antenna Size 100MHz: Radio 11

13 Radio Licensing Regional National Link Area 12

14 Rural Fixed Wireless Coverage

15 We re doing it wrong. 14

16 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 15

17 Electrospace 16

18 Where & when there s no signal in an Electrospace, we have Whitespace. 17

19 UHF TV Coverage Area Whitespace Whitespace: A Simple Example 18

20 Typical TV Broadcast Configuration Tower A: Ch: 1,3,5,7,9 Tower B: Ch: 2,4,6,8,10 X TVWS: 2,4,6,8,10 Y TVWS: 1,3,5,7,9 TVWS: ALL Z 19

21 How does this look to a Spectrum Analyser? 20

22 Wellington, New Zealand UHF Broadcast Spectrum,

23 W Wellington, New Zealand UHF Broadcast Spectrum,

24 W HI Wellington, New Zealand UHF Broadcast Spectrum,

25 W HI T E S P A C Wellington, New Zealand UHF Broadcast Spectrum,

26 W HI T E S P A C E Wellington, New Zealand UHF Broadcast Spectrum,

27 Wellington s Not Special It s Like That Everywhere 22

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29 Why are we not using Whitespace right now? 24

30 How can we use whitespace without breaking existing services? 25

31 How can we use whitespace without breaking existing services? Cognitive Radio 25

32 Cognitive Radio Aware Adapts Senses Interacts 26

33 And it s real. 27

34 IEEE is the first Wireless Regional Area Networking standard. 28

35 IEEE delivers fixed wireless broadband using Cognitive Radio in TV Whitespace Spectrum 29

36 IEEE Protects Primary Users 30

37 IEEE Protects Primary Users 31

38 IEEE Protects Primary Users Using Geolocation & Spectrum Databases 31

39 IEEE Protects Primary Users 32

40 IEEE Protects Primary Users Using Geolocation & Spectrum Databases 32

41 IEEE Protects Primary Users Using Geolocation & Spectrum Databases And Spectrum Sensing 32

42 So how does IEEE compare? 33

43 MHz Channel Size: 6MHz WCDMA LTE 34

44 Spectral Efficiency 20 bits per Hz g WCDMA LTE 35

45 MHz Spectrum Availability TVWS 700MHz 900MHz 1800MHz 2100MHz 2.4GHz 36

46 What About In Real Life? 37

47 Wi-Fi vs TVWS Community Studies Three Rural New Zealand Communities Modeled with Awe WinProp at 25M Same Emitted Power for Both Technologies (4 Watts EIRP) Like for Like Subscriber Antenna Sizes 38

48 Parikino, Whanganui River Valley 39

49 Parikino Area Whanganui River Valley 40

50 Parikino on Wi-Fi: 18 Houses Ok 41

51 Parikino on TVWS: 28 Houses Ok 42

52 Cognitive Radio in TV Whitespace Has Real Potential for Rural Broadband 43

53 TVWS 2 pax / km 2 It changes the economics of rural wireless 44

54 Trials are on in Singapore, UK, US. Expect hardware in 2-3 years 45

55 Paper available: or telco2_whitespace_study_community_examples_final.pdf 46

56 Thank You! Sponsored in part by 47