1. 802.11 WNG Presentation: 6-9GHz extensions to 802.11
July 2007
Nov 2009
May 2011
WNG Presentation: 6-9GHz extensions to
Date:
Authors:
Peter Ecclesine (Cisco Systems)

2. Nov 2009
May 2011
Abstract
This document presents the possibility of using existing shared spectrum allocation in 6-9GHz as a new frequency band for an PHY with a 500MHz bandwidth.

3. May 2011
Background
The US FCC announced spectrum availability of GHz for ultrawideband 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 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 9GHz 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
Spectrum is underutilized and globally available

4. Wider BW: Shannon Capacity (SISO)
May 2011
Wider BW: Shannon Capacity (SISO)
Courtesy Prof. Jeff Reed, Va Tech)
Wide bandwidths can have high capacity at low SNR
Small cells increase spatial capacity
Can achieve MIMO speeds of narrowband with SISO simplicity
Using MIMO can achieve even higher capacity

5. Worldwide Regulations
Nov 2009
May 2011
Worldwide Regulations 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
3GHz of contiguous bandwidth from 6-9GHz is available
Japan & Korea don’t allow operation from /7.25GHz
EU has a detection requirement in 8.5-9GHz similar to 5.4GHz
Minimum bandwidth is 450 or 500MHz
Peter Ecclesine (Cisco Systems)

6. Why UWB for 802.11? Gives needed capacity for high rate communications
May 2011
Why UWB for ?
Gives 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…interference, frequency reuse, etc.
Could leverage existing ac/ad MAC and PHY extensions
MU-MIMO, STBC, and other extensions will greatly enhance link budget…more than doubling range of SISO
Relatively “low hanging fruit” for existing 5GHz radios
Band starts at 6GHz – just above 5GHz ISM band
Extension of 5GHz bands – minimal antenna and RF impact
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

7. March 2011
What would be involved?
Existing ac/ad PHY + MAC provides most of the hooks
450/500MHz minimum bandwidth will require new MCS combinations
Effectiveness of beamforming is TBD
MIMO/MU-MIMO could be very useful
Can use simpler OFDM modulation (e.g. 16-QAM)
Shannon capacity of 500MHz channel is very high at low SNR
At least five 500MHz channels are available in 6-9GHz
Allows k=4 frequency reuse for high user density
Studies may be required to see how well MU-MIMO will operate
Other regulatory domains may permit <500MHz BW

8. Some work is done, some is not
May 2011
Some work is done, some is not
Use cases need to be refined
Wireless dock
Wireless sync
Much work has been done on propagation models )
Target Channel Characteristics
RMS delay
Notes
CM1
5.28nsec
LOS(0~4m)
CM2
8.03nsec
NLOS(0~4m)
CM3
14.28nsec
NLOS(4~10m)
CM4
25nsec
25nsec RMS delay spread to represent an extreme multi-path channel

9. Next steps Solicitation for additional WNG presentations Others?
March 2011
Next steps
Solicitation for additional WNG presentations
Others?