1. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) Slide 1 802.11 WNG Presentation on the use of UWB spectrum for 802.11 Date: 2011-03-15 Authors: March 2011

2. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) 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. Slide 2 March 2011

3. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) 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 March 2011 Slide 3

4. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) Globally Available Worldwide Regulations for UWB Over 1GHz of contiguous bandwidth from 7.25-8.5GHz is available globally without restriction Minimum bandwidth is 450 or 500MHz March 2011 Slide 4 US Feb-02 EU Dec-06 Japan Sep-2006 Canada March-2009 3.168 GHz10.5606.3364.7527.9209.5047.3928.976 2010 w/DAA 2010 w/DAA Korea Sep-2006 2010 w/DAA 2010 w/DAA See Note 2010 w/DAA 2010 w/DAA 2010 w/DAA 2010 w/DAA 2010 w/DAA China Jan-09

5. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) 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 March 2011 Slide 5

6. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) Cube farm spatial capacity March 2011 Slide 6 2.5 m At 320Mb/s at 8.2GHz, radius of coverage is ~2 meters with SISO OFDM 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/m 2 –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. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) 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 March 2011 Slide 7

8. Submission doc.: 802.11-11/0385r00 Jim Lansford, Richard Edgar (CSR) Next steps Solicitation for additional WNG presentations Comments/discussion? March 2011 Slide 8