Spectrum Changes: Future Coexistence In The White Spaces

Transcript

Spectrum Changes: Future Coexistence in the White Spaces www.shure.com/training Training Materials Questions? Chris Lyons [email protected] 847-600-8704 Dave Mendez [email protected] 847-600-6296 Product Support [email protected] 847-600-8440 Agenda • • • • TV Band Devices Geo-Location Database Incentive Auction Licensing & Other Issues Broadcast vs. Broadband 10% Watch TV antenna 53% Own a Smartphone 300 MHz 3 GHz Stop using wireless mics in the 700 MHz band! TV Band Devices TV Band Devices Now authorized nationwide Only Fixed devices so far SAFETY SAFETY TV TV TV TV TV TV TV RESERVED TV Radio Astronomy TV TV TV TV RESERVED TV TV TV TV TV TV TV TV Channel 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Frequency Range (MHz) 476 – 482 482 – 488 488 – 494 494 – 500 500 – 506 506 – 512 512 – 518 518 – 524 524 – 530 530 – 536 536 – 542 542 – 548 548 – 554 554 – 560 560 – 566 566 – 572 572 – 578 578 – 584 584 – 590 590 – 596 596 – 602 602 – 608 608 – 614 614 – 620 620 – 626 626 – 632 632 – 638 638 – 644 644 – 650 650 – 656 656 – 662 662 – 668 668 – 674 674 – 680 680 – 686 686 – 692 692– 698 TV TV TV TV Permitted Users TV Local Assignments 470 – 476 Where TV Band Devices Operate Wireless Mics Fixed TVBD’s Wireless Mics Fixed & Portable TVBD’s Geo-location Database • Database shows with TV channels are reserved for wireless mics • Registering event protects you from interference on non-reserved channels – Licensed users get quick access – Unlicensed users need FCC approval first • 30-day advance notice required • Expect them to be very selective Incentive Auction Incentive Auction Reverse Auction TV stations bid to change/share channel OR go dark for $ Forward Auction Carriers bid $ on open spectrum How much spectrum? Which spectrum? When? Repacking Stations are moved to new channels How much spectrum? • Depends on how many TV stations volunteer • 40 MHz? 60 MHz? 80 MHz? • Could vary in different cities Which spectrum? TV TV TV TV TV TV RESERVED TV MED / ASTRO RESERVED TV TV 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Freq Range (MHz) 482 – 488 488 – 494 494 – 500 500 – 506 506 – 512 512 – 518 518 – 524 524 – 530 530 – 536 536 – 542 542 – 548 548 – 554 554 – 560 560 – 566 566 – 572 572 – 578 578 – 584 584 – 590 590 – 596 596 – 602 602 – 608 608 – 614 614 – 620 620 – 626 626 – 632 632 – 638 638 – 644 644 – 650 650 – 656 656 – 662 662 – 668 668 – 674 674 – 680 680 – 686 686 – 692 692– 698 AUCTION GUARD BAND TV TV TV GUARD BAND TV TV 14 476 – 482 TV TV TV TV 470 – 476 The Most Likely Scenario ACTUAL SIZE DEPENDS ON TV STATION PARTICIPATION AUCTION Auction Timeline • FCC wants to start auction in 2014 • Repacking process could take several years Other Issues • Should Reserved TV channels for wireless mics be eliminated? • Should license eligibility be expanded? Wireless Mic Licenses ELIGIBLE NOW • Broadcasters • Educ TV networks • Cable networks • TV & film prod co’s NOT ELIGIBLE NOW • Theaters, venues • Hotels/convention ctrs • Theme parks • AV rental/prod co’s • Churches • Schools Some Approaches to Spectrum Changes • More Frequency Bands – Lower UHF – Unlicensed Bands (900 MHz, 2.4 GHz, DECT, etc.) • Spectral Efficiency – More Channels / MHz • RF Hardware & Software Tools • Interference Mitigation – Frequency Diversity – Interference Avoidance Copyright 2010 Shure Inc. This material may not be published or duplicated without permission. Frequency Band Expansions: 2.4 GHz ISM Band • 2.400 – 2.4835 MHz • Wavelength ~5 inches – Shorter range, more body absorption • Need real-time agility to avoid existing users – Wi-Fi, Bluetooth, cordless phones, etc. Continuous Wi-Fi “Bursting” Wi-Fi Frequency Band Expansions: 1.9 GHz DECT Band • 1920 – 1930 MHz (US) – DECT bands differ by country – Usually no more than 32 systems • Typical interference sources – Wireless headsets (Plantronics) – DECTv6 cordless phones – Certain wireless conferencing systems Spectral Efficiency: More Mics in Less MHz How useful is 6 MHz?: • • • • PGX ~ 5 systems SLX ~ 5 systems ULXP ~ 8 systems UHF-R ~ 10 systems • Axient ~ 13 systems • ULX-D ~ 17 systems Spectral Efficiency: Ch-to-Ch Spacing PGX ULX UR AX +/-+/.450 MHz +/.325 +/- 1.2 MHz MHz .150 MHz PGX ULX UR AX Spectral Efficiency: Linearity Typical UHF System Transmitters Intermod Products Intermod Products Axient & ULXD Spectral Efficiency: High Density mode • Optimizes the system by: • Lowering RF Power (1mW) • Reducing the modulation BW • Reducing channel spacing from 350 kHz to 125 kHz • 47 Tx in a 6 MHz TV Channel • Range ~ 100 to 150 feet. 6Mhz Spectrum Management: Hardware Tools • Wideband Scanner & Coordination Tool • Built-In Coordination Wizard – Ability to manually configure Freq List • Backup Frequency Monitoring & Ranking – Allows for Auto Interference Avoidance with AXIENT Spectrum Management: Hardware Tools • More scanning hardware – Shure UR5 (60 MHz) Portable Receiver • Info only viewed on device – Shure P10R (72 MHz) IEM Receiver • Also import scan into WWB6 – TTI Spectrum Analyzer • Some real time analysis • Import scan info as .csv file – WinRadio • Import scans (.35s file extension) Spectrum Management: Software Tools • Frequency Compatibility Engine • Based on Scan data from Hardware or User input • System profiles of popular gear • Embedded TV Database • Usually higher power only • RF “Zone” Coordination • Report print and save Spectrum Management: Online Tools • Active “White Space” Databases • Spectrum Bridge • http://whitespaces.spectrumbridge.com/whitespaces/home.aspx • Telcordia • https://prism.telcordia.com/tvws/home/contour_vis.shtml • Google • http://www.google.org/spectrum/whitespace/channel/ • Keybridge • https://whitespace.keybridgeglobal.com/ • Helpful without hardware, or in combo with software tools Spectrum Management: “White Space” Database Example Interference Handling: Interference Detection • Warns user with front panel display – Software warnings provided via Wireless Workbench 6.0 – Early Warning about potential trouble Interference Handling: Frequency Diversity • HANDHELD DIVERSITY – simultaneously transmits on two frequencies – Built into every Axient Handheld only • BODYPACK DIVERSITY – Requires Double packing – Output is switched – Available on Axient and ULXD Systems • Single audio connection to mixing board • Seamless audio with direct interference Interference Handling: Interference Detection & Avoidance • Receiver Detects Interference Current: 478MHz 485MHz • Receiver requests new freq from Spectrum Manager • Spectrum Manager deploys best ranked backup to Receiver 485MHz • Transmitter switches to match new freq 485MHz Questions? Applications Engineering [email protected] 847-600-8440 Questions?