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Wireless Mics, White Spaces and You
Karl Voss KAET
White Space 101 – General Terminology
• “White Space Devices” (WSD) • “TV Band Devices” (TVBD) • “White Space Database”
(WSDB) • “Low Power Auxiliary” (LPA)
– FCC Licensed device that is protected from interference from White Space Devices
4/15/2014 2 Wireless Mics, White Spaces and You
White Space 101 - Types of WSD • Fixed • Personal/Portable – Mode I • Personal/Portable – Mode II
• Unlicensed device and must not
cause interference to licensed users
• Nationwide use approved 4/15/2014 3
Fixed White Space Devices
• Any TV channel except 3, 4 & 37
• Limited to 4 Watts ERP
• Antenna max height: 30 meters AGL
• Must access WSDB at least every 24 hours
• Must be location aware – Professionally installed or – Geo-location capability
4/15/2014 4
Personal/Portable – Mode II
• TV channels 21-36 & 38-51
• 100 mW max or 40 mW if on adjacent TV channel
• Geo-location is required; +/- 50 meter accuracy
• Must check in with WSDB – If it moves 100 meters or more – At power up & every 24 hours
4/15/2014 5
Personal/Portable – Mode I • TV channels 21-36 & 38-51
• 100 mW max or 40 mW if on adjacent TV channel
• Not location aware • Must check with its controller for channel
– At power up and – every 60 seconds and – shut down if it cannot contact it
4/15/2014 6
Licensed LPA Protection Distances
• Licensed LPA sites have a – 400 meter protection radius from
Mode I & II Personal/Portable WSD – 1 km protection radius from Fixed
WSD •
Assuming the LPA device is in the WSDB, this effectively protects unlicensed WSD from interference by licensed LPA devices!
4/15/2014 7
100 mW Wireless Mic Coverage Antenna TX 1 m AGL RX 2 m AGL
1 km Radius Rings
Black: 6km 4/15/2014 8
Levels in dBm: Red: -60, Green: -78, Cyan: -87, Dark Blue: -98
250 mW Wireless Mic Coverage Antenna TX 1 m AGL RX 2 m AGL
1 km Radius Rings
Black: 6km 4/15/2014 9
Levels in dBm: Red: -60, Green: -78, Cyan: -87, Dark Blue: -98
4 Watt Fixed White Space Device Coverage Antenna TX 30 m AGL RX 2 m AGL
1 km Radius Rings
White: 6km 4/15/2014 10
Levels in dBm: Red: -60, Green: -78, Cyan: -87, Dark Blue: -98
How Do I Protect My Operations!
1. License your LPA devices!
4/15/2014 11
Phoenix LPA Licenses
100 km radius from Phoenix, AZ Standard FCC Coordinates 33° 27’ 05” -112° 04’ 24” (Central and Van Buren in Phoenix; zip 85001 )
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Phoenix LPA Licenses
• 15 LPA Licenses in Phoenix Metro Area 8 TV Stations 4 Radio Stations
4/15/2014 13
How Do I Protect My Operations!
1. License your LPA devices 2. Register your operations
with a WSDB • 10 potential WSDB providers • 4 currently authorized by FCC • All sync every 24 hours by rule • Wildly different user interfaces
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White Space Database Administrators
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WSDB Administrator Start Testing FCC Comments FCC Approved Comsearch Feb 2014 Frequency Finder Google Feb 2013 May 2013 June 2013 LS Telecom June 2013 Nov 2013 Key Bridge Global * March 2013 May 2013 Nov 2013 Microsoft Neustar Spectrum Bridge Sept 2011 Nov 2011 Dec 2011 Telcordia (iConnectiv) Dec 2011 Feb 2012 March 2012 WSdb
White Space Registration
Phoenix Metro Area
4 Protected Sites
1 Cable Head End
FCC allows 3 different types of registration:
point/circle, polygon & extended polygon
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Point Registration
Key Bridge Global Enterprise Portal 4/15/2014 17
Polygon Registration
Key Bridge Global Enterprise Portal 4/15/2014 18
Large Area (Multi-Polygon) Registration
Key Bridge Global Enterprise Portal 4/15/2014 19
Point vs. Polygon Registration
Point/Circle 4/15/2014 20
Polygon
Point vs. Polygon Registration
Point/Circle 4/15/2014 21
3 km max between adjacent points, 25 points max
Point vs. Polygon Registration
400 m protection from center point
4/15/2014 22
400 m protection from polygon edge = 1.9 km radius
Point vs. Polygon Registration
1 km protection from fixed WSD
4/15/2014 23
1 km protection from polygon edge = 2.5 km radius
White Space Registration Available White
Space channels are calculated from:
1. WSD location 2. WSD type 3. Protected Registration type
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LPA Protected Area
Personal/Portable Protection Zone (Dark Orange in polygon & Grey in point) 4/15/2014 25
White Space Devices are NOT allowed and channels are not available for WSD in this area. But…
LPA Protected Area
Personal/Portable Protection Zone (Dark Orange in polygon & Grey in point) 4/15/2014 26
…Mode I devices are not location aware and could accidently move into the protected area; possibly causing interference to protected LPA devices.
Personal/Portable Available Area
Fixed Device Protection Zone: Lite Orange or Between Circles 100 mW Device Ch 30, 31, 44 40 mW Device Ch 21, 23, 27, 29, 30, 31, 32, 44, 45, 47, 48
4/15/2014 27
WSD Usage: Outside LPA Protected Areas
All WSD OK, Fixed Device Ch 2, 5, 6, 30, 31, 44 OK 100 mW Device Ch 30, 31, 44 40 mW Device Ch 21, 23, 27, 29, 30, 31, 32, 44, 45, 47, 48
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WSD Interference to YOUR licensed system
Pin at Golf Course that wants to use
Fixed WSD for golfers and sprinklers
(4watts @ 30m AGL)
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A FIXED WSD device at this location can use Channels 2, 5, 6, 30, 31 & 44
WSD Interference to YOUR licensed system Antenna TX 30 m AGL RX 2 m AGL
1 km Radius Rings
White: 6km 4/15/2014 30
Levels in dBm: Red: -60, Green: -78, Cyan: -87, Dark Blue: -98
WSD Interference to YOUR licensed system
WSD running 4 watts at 30 meters
AGL creates a service area with
about a 6 KM radius
Ch 2, 5, 6, 30, 31 & 44 are available to this Fixed WSD
but… 4/15/2014 31
WSD Interference to YOUR licensed system
…Non-Location aware Mode I
devices at 40 or 100 mW can
wander around using Channels
21, 23, 27, 29, 30, 31, 32, 44, 45, 47,
48
4/15/2014 32
Current WSD Locations - iConnectiv
4/15/2014 Wireless Mics, White Spaces and You 33
Red Pin: My Demo WSD
Green Pins:
Actual WSD found in WSDB
Encanto Park WSD Location Details
4/15/2014 Wireless Mics, White Spaces and You 34
Spectrum Bridge
4/15/2014 Wireless Mics, White Spaces and You 35
Actual Encanto Park WSDB entry
from Spectrum
Bridge
4/15/2014 Wireless Mics, White Spaces and You 36
Actual Encanto Park WSDB entry from Google
4/15/2014 Wireless Mics, White Spaces and You 37
WSD channels available per Google at the Encanto Park
location
Keybridge Global
4/15/2014 Wireless Mics, White Spaces and You 38
Keybridge Global
4/15/2014 Wireless Mics, White Spaces and You 39
Odds & Ends
• Waiver request by WSD folks to ignore the adjacent channel WSD restriction – allow 40 mW fixed devices to be used - in
stores?
• How will upcoming spectrum auction/repack affect both WSD and LPA operations?
4/15/2014 40
FCC White Space Rules
• 2nd Memandorum & Order – FCC-10-174A1.pdf – Sept 2010
• 3rd Memandorum & Order – FCC-12-36A1.pdf – April 2012
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White Space Database Administrators
• Key Bridge & Key Bridge Enterprise: https://keybridgeglobal.com/whitespace https://ee.keybridgeglobal.com/ee/
• Spectrum Bridge: whitespaces.spectrumbridge.com/whitespaces/
• Telcordia: https://spectrum.iconectiv.com/main/home/
• Google: www.google.com/get/spectrumdatabase/
4/15/2014 42
