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TGy Overview

TGy Overview. Authors:. Date: 2008-03-24. Abstract. This submission summarizes the TGy amendment to IEEE 802.11-2007. TGy Report.

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TGy Overview

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  1. TGy Overview Authors: Date: 2008-03-24 Peter Ecclesine, Cisco Systems

  2. Abstract This submission summarizes the TGy amendment to IEEE 802.11-2007 Peter Ecclesine, Cisco Systems

  3. TGy Report • The Contention-Based Protocol Study Group was started in March 2005, to examine the opportunity afforded by FCCReport and Order and Memorandum Opinion and Order (FCC 05-56) http://en.wikipedia.org/wiki/IEEE_802.11y • TGy started after March 2006 plenary, received 39 submissions, created 72 body pages of draft text, and is in second recirculation IEEE Sponsor Ballot • https://mentor.ieee.org/802.11/file/06/11-06-1023-00-000y-proposal-tgy.ppt Peter Ecclesine, Cisco Systems

  4. Amendments to standard IEEE 802.11-2007™ + P802.11k D13.0 + P802.11r D9.0 + P802.11y D9.0 1184 pages + 224 pages + 112 pages + 72 pages = 1592 body text pages Peter Ecclesine, Cisco Systems

  5. Licenses • Exclusive area license for frequency band • Exclusive path license (47 CFR 101 70/80/90 GHz, FCC 05-45) • Non-exclusive license (47 CFR 90) • License exempt operation (47 CFR 15) • Experimental license (limited area, limited deployment) • “NOTHING IS IMPOSSIBLE IN THE LAW” - Clark Byse • License is an asset, and equipment can be capitalized • No license = no fees = no enforcement • No jurisdiction = no fines = no enforcement • (in California, 1 of every 3000 vehicles is a police car) • (in California, cities buy radar/laser for the CHP, and split the fines) Peter Ecclesine, Cisco Systems

  6. Metropolitan Areas Requiring Coordination with FSS and Government Sites FSS protection zones in blue Government protection zone in green Top 50 counties by population (2000 census) in red Many large metropolitan areas are restricted! Peter Ecclesine, Cisco Systems

  7. 802.11 outdoors • SlotTime was wrong in the base standard, but was corrected in 2007 • In slotted Aloha, SlotTime is the round-trip time between the most distant station pair, but in the old 802.11 standard, SlotTime was the one-way time between the most distant station pair • A 1 microsecond SlotTime works to ~150 meters • Coverage Class allows distances to ~10 miles ( to 93 uS aAirPropagationTime) • Because there are no adjustable preambles in the standard, outdoor products use non-standard adjustments to their radios Peter Ecclesine, Cisco Systems

  8. 802.11y CCA change • Adjustable Clear Channel Assessment threshold (Energy Detect) allows an operator to adjust the politeness of radios • Radios have improved since 802.11a became a standard in 1999, and can operate with lower received signal levels than -82 dBm (the lowest required signal for 6 Mbps operation) • 802.11y lowers the threshold by at least 10 dB, and allows the operator to require even lower thresholds to protect more distant stations. Peter Ecclesine, Cisco Systems

  9. 802.11 Enabling STA • Is allowed higher power (to 1W/MHz), and can enable dependent stations (to 40 mW/MHz) • 802.11 defines the enabling signal received directly from the enabling STA as 802.11 Beacon frames with the GPS lat/lon of the enabling STA • Enabling signal can turn off, and all dependent stations will be disabled within 60 seconds • All other messaging can be by tunneling / upper layers Peter Ecclesine, Cisco Systems

  10. Two examples • A licensed operator installs a few enabling STAs to cover an oil field, then uses dependent stations at each pump or truck or rig. The IT department manages all the radios. • A fire station locates an enabling STA on its communications tower, and uses dependent stations on each fire truck and laptop. The incident commander controls the enabling STA using a Public Safety band radio. Peter Ecclesine, Cisco Systems

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