1. 802.11 WNG Presentation on the use of UWB spectrum for 802.11
July 2007
Nov 2009
March 2011
WNG Presentation on the use of UWB spectrum for
Date:
Authors:
Peter Ecclesine (Cisco Systems)

2. Nov 2009
March 2011
Abstract
This document presents the possibility of using existing shared spectrum allocation for ultrawideband as a new frequency band for ac MAC and PHY with a 500MHz bandwidth.

3. March 2011
UWB Background
The US FCC announced spectrum availability of GHz 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
a – withdrew PAR in January 2006
a – Approved in March 2007, but minimal market deployment
UWB spectrum is underutilized and globally available

4. Worldwide Regulations for UWB
Nov 2009
March 2011
Worldwide Regulations for UWB
Globally Available US
Feb-02 EU
Dec-06
2010
w/DAA
2010
w/DAA
See
Note
2010
w/DAA
Japan
Sep-2006
2010
w/DAA
2010
w/DAA
Korea
Sep-2006
2010
w/DAA
2010
w/DAA
2010
w/DAA
Canada
March-2009
China
Jan-09
2010
w/DAA
3.168 GHz
4.752
6.336
7.392
7.920
8.976
9.504
10.560
Over 1GHz of contiguous bandwidth from GHz is available globally without restriction
Minimum bandwidth is 450 or 500MHz
Peter Ecclesine (Cisco Systems)

5. Why UWB for 802.11? Adds needed capacity for high rate communications
March 2011
Why UWB for ?
Adds needed capacity for high rate communications
Wireless docking/monitors using ac 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 ac 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
March 2011
Cube farm spatial capacity
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/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. March 2011
What would be involved?
Existing ac 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 GHz
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
March 2011
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 ac this week to request feedback from them?
Y: 26 N: 0 d/c: 7