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802.11 WNG Presentation on the use of UWB spectrum for 802.11

802.11 WNG Presentation on the use of UWB spectrum for 802.11. Authors:. Date: 2011-03-15. Abstract. This document presents the possibility of using existing shared spectrum allocation for ultrawideband as a new frequency band for 802.11ac MAC and PHY with a 500MHz bandwidth. UWB Background.

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802.11 WNG Presentation on the use of UWB spectrum for 802.11

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  1. 802.11 WNG Presentation on the use of UWB spectrum for 802.11 Authors: Date: 2011-03-15

  2. Abstract This document presents the possibility of using existing shared spectrum allocation for ultrawideband as a new frequency band for 802.11ac MAC and PHY with a 500MHz bandwidth.

  3. UWB Background • The US FCC announced spectrum availability of 3-10.5GHz for UWB in February, 2002 • “Spectral underlay” – operates without any spectrum etiquette or spectrum sensing • PSD limit: -41.3dBm/MHz ≈ -14dBm in a 500MHz BW • 500MHz (or 20% fractional bandwidth) minimum • Most other countries have now finalized UWB regulations • UK, EU, Korea, China, Canada, Japan • Operation from 5-6GHz generally not allowed • Many restrictions in 3-5GHz, including spectrum sensing (DAA) • Operation above 8.5GHz either not allowed or requires DFS • Some IEEE efforts have addressed this spectrum • 802.15.3a – withdrew PAR in January 2006 • 802.15.4a – Approved in March 2007, but minimal market deployment • UWB spectrum is underutilized and globally available

  4. Worldwide Regulations for UWB Globally Available US Feb-02 • Over 1GHz of contiguous bandwidth from 7.25-8.5GHz is available globally without restriction • Minimum bandwidth is 450 or 500MHz EU Dec-06 2010 w/DAA 2010 w/DAA 2010 w/DAA See Note Japan Sep-2006 2010 w/DAA 2010 w/DAA Korea Sep-2006 2010 w/DAA 2010 w/DAA 2010 w/DAA Canada March-2009 2010 w/DAA China Jan-09 3.168 GHz 4.752 6.336 7.392 7.920 8.976 9.504 10.560

  5. Why UWB for 802.11? • Adds needed capacity for high rate communications • Wireless docking/monitors using 802.11ac will tax existing 5GHz spectrum allocation • Some countries highly restrict 5GHz spectrum (China) • High density environments (cubicle farms) will have serious spatial capacity problems • Could leverage existing 802.11ac MAC and PHY extensions • MU-MIMO, STBC, and other extensions will greatly enhance link budget…more than doubling range • High bandwidth allows precision ranging/location • For applications that need relatively short range (<10 meters) and very high spatial capacity, this spectrum could be ideal

  6. Cube farm spatial capacity 2.5 m • At 320Mb/s at 8.2GHz, radius of coverage is ~2 meters with SISOOFDM • In a 10x10 foot space, this provides an aggregate spatial capacity of 5.12Gb/s • Minimum of 4 channels is required • Could be shared band • On a per square meter basis, this is 512Mb/s/m2 • Negligible interference between users • Small cells yield highest spatial capacity in users per square meter • SISO OFDM UWB has a coverage area just larger than an average cubicle • Channel reuse can optimize capacity with minimum interference

  7. What would be involved? • Existing 802.11ac PHY + MAC provides most of the hooks • 450/500MHz minimum bandwidth will require new MCS combinations • Beamforming may not be useful • MIMO/MU-MIMO could be very useful • Can use simpler OFDM modulation • Shannon capacity of 500MHz channel is very high at low SNR • At least two 500MHz channels are available in 7.25-8.5GHz • Studies may be required to see how well MU-MIMO will operate • Other regulatory domains may permit <500MHz BW

  8. Next steps • Solicitation for additional WNG presentations • Comments/discussion? • Straw poll: • Should further work be done on this topic? • Y: 33 N: 0 d/c: 5 • Should we approach 802.11ac this week to request feedback from them? • Y: 26 N: 0 d/c: 7

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