1 / 12

TGy Overview

TGy Overview. Authors:. Date: 2008-03-24. Abstract. This submission summarizes the TGy amendment to IEEE 802.11-2007 P802.11y 3650-3700 MHz Operation in the USA. TGy Report.

rhiannon-fischer
Download Presentation

TGy Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 P802.11y 3650-3700 MHz Operation in the USA 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 completed third 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 11k Radio Measurement 11r Fast Handover 11y 3650-3700 MHz Operation in the USA IEEE 802.11-2007™ + P802.11k D13.0 + P802.11r D9.0 + P802.11y D10.0 1184 pages + 224 pages + 112 pages + 72 pages = 1592 body text pages Peter Ecclesine, Cisco Systems

  5. 11y features (1) • Management/measurement tools to identify and resolve interference complaints among licensed operators • All transmission activity can be halted within 60 seconds by a licensed operator • Enabling signal – Beacon frame information element with registered site location and enablement indicators, that must be received over the air directly from the enabling STA • Registered site location allows those suffering interference to find operator whose station’s operation is causing the interference • Dependent STAs – licensed operators can control any dependent STA’s frequency, power, and operation/measurement activity • to allow low-power dependent STAs to communicate with a high-power enabling STA, enablement/deenablement may be tunneled by APs and other STAs, may be off channel/another band/Internet Peter Ecclesine, Cisco Systems

  6. 11y features (2) • Clear Channel Assessment – Energy Detect • -72 dBm (20 MHz) / -75 dBm (10 MHz) / -78 dBm (5 MHz) • TPC and DFS apparatus (like 5 GHz) • Non-overlapping channel plan (like 5 GHz) • 20 MHz = 2 * 10 MHz = 4 * 5 MHz • Band edge channels not used by standard, in order to meet out-of-band emissions limits without severe transmit spectral masks • 4 msec Carrier Sense rule to increase sharing among STAs • No transmission longer than 4 msec (like Japan license-exempt) Peter Ecclesine, Cisco Systems

  7. 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

  8. On 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 on the highways is a police car) • (in California, cities buy radar/laser for the CHP, and the courts keep the fines) Peter Ecclesine, Cisco Systems

  9. 802.11 outdoors • SlotTime was wrong in the base standard, but was corrected in 802.11-2007™ • 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 µS aAirPropagationTime) • Because there are no adjustable preambles in the 802.11 standard, outdoor products use non-standard adjustments to their radios Peter Ecclesine, Cisco Systems

  10. 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 energy detect threshold by at least 10 dB, and allows the operator to specify even lower thresholds to protect more distant stations. Peter Ecclesine, Cisco Systems

  11. 802.11 Enabling STA • Is allowed higher power (up to 1W/MHz), and can enable dependent stations (up 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 enablement messaging can be by tunneling / upper layers • Enabling STA commands Transmit power mitigation, operating channel, measurements on/off-channel Peter Ecclesine, Cisco Systems

  12. 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 of the operator 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 communicates with the enabling STA using a Public Safety band radio, and controls use of the 3650 MHz band near the incident. Peter Ecclesine, Cisco Systems

More Related