doc.: IEEE 802.11-11/0489r0 Submission March 2011 Steve Shellhammer, Qualcomm Inc. Slide 1 Wideband PHY Channel Availability Date: 2011-03-29 N am e A ffiliations A ddress Phone em ail Steve Shellham m er Qualcom m 5775 M orehouse D rive, San D iego CA 1-858-658- 1874 sshellha@ qualcom m.com A hm ed Sadek Qualcom m 5775 M orehouse D rive, San D iego CA 1-858-658- 1362 asadek@ qualcom m .com V K Jones Qualcom m 3165 K iferRoad Santa Clara, CA +1-408-533- 9522 vkjones@ qualcom m.com RolfD eV egt Qualcom m 3165 K iferRoad Santa Clara, CA 1-408-533- 9545 rolfv@ qualcom m.com H em anth Sam path Qualcom m 5775 M orehouse D rive, San D iego CA 1-858-658- 1848 hsampath@ qualcom m.com A braham Santosh Qualcom m 5775 M orehouse D rive, San D iego CA 1-858-651- 6107 sabraham @ qualcom m.com M enzo W entink Qualcom m Breukelen,the Netherlands +31-65-183- 6231 m wentink@ qualcomm .com Richard V an N ee Qualcom m Breukelen,the Netherlands +31-346-259- 650 rvannee@ qualcom m.com Authors:
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doc.: IEEE 802.11-11/0489r0
Submission
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 1
Wideband PHY Channel AvailabilityDate: 2011-03-29
Name Affiliations Address Phone email Steve Shellhammer Qualcomm 5775 Morehouse
Submission Steve Shellhammer, Qualcomm Inc.Slide 2
Abstract
There are several methods to obtain wideband PHY operation in the TVWS: wideband PHY and multicarrier PHY. This presentation provides a study of how many wideband WLAN channels are available in the TVWS using each of these two approaches
Goal• It may be reasonable to restrict BW operation to only
5MHz in 802.11af
• For use cases that require higher throughput, higher levels of BW may be required
• How best to achieve these higher BW modes?
• Need also to consider carrier sense of wideband PHY modes for coexistence between different BW PHYs
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 4
doc.: IEEE 802.11-11/0489r0
Submission
Outline• Options for 10 MHz and 20 MHz WLAN channels
• White space availability for 10 MHz and 20 MHz channels – Study across all zip codes in the United States– Portable Networks
– Fixed/Portable Networks
• Conclusions
• Annex– Study for 50 largest cities in the United States
• White space availability for 10 MHz and 20 MHz channels
• Study for both Portable and Fixed/Portable Networks
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 5
doc.: IEEE 802.11-11/0489r0
Submission
Options for 10 MHz WLAN Channels
Option #1 Option #2
Label 10 5+5
WLAN PHY 10 MHz PHY•Approach used in Current Draft
Multicarrier PHYUse two non-adjacent 5 MHz carriersSimilar to 80+80 in 802.11ac
TV Channel Usage
Requires two adjacent TV channels Requires two non-adjacent TV channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 6
doc.: IEEE 802.11-11/0489r0
Submission
Options for 20 MHz WLAN Channels
Option #1 Option #2 Option #3
Label 20 10+10 5+5+5+5
WLAN PHY
20 MHz PHY•Approach used in Current Draft
Multicarrier PHYUse two non-adjacent 10MHz carriersSimilar to 80+80 in 802.11ac
Multicarrier PHYUse four non-adjacent 5MHz carriers
TV Channel Usage
Requires four adjacent TV channels
Requires two pairs of two adjacent TV channels
Requires four non-adjacent TV channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 7
doc.: IEEE 802.11-11/0489r0
Submission
Wideband Channel Availability Study• Obtained FCC standard power TV database
• Obtained low-power TV database (by zip code)
• Calculated which TV channels are available for each zip code in the United States– Networks of portable devices
– Networks of fixed/portable devices
• Our analysis agrees well with UC Berkeley analysis [1] – Our analysis has been updated based on the final FCC R&O
• Calculated the number of WLAN channels for each of the options, for a typical user
• This number is a random variable
• Plotted the CDF of the number of available WLAN channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 8
doc.: IEEE 802.11-11/0489r0
Submission
Number of 10 MHz WLAN Channels
• Calculate the population that has N 10 MHz channels– Perform calculation for both Option #1 and #2
• The probability that a user has N 10MHz WLAN channels is that population divided by the total US population– By calculating for each value of n we can obtain the probability mass
function for N – PN(n)
– Convert from probability mass function (PMF) into the cumulative distribution function (CDF) and plot
• Same approach for 20 MHz WLAN Channels– Consider Options #1, #2, #3
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 9
doc.: IEEE 802.11-11/0489r0
Submission
Portable Networks – Number of 10 MHz WLAN Channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 10
doc.: IEEE 802.11-11/0489r0
Submission
Portable Networks – Number of 20 MHz WLAN Channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 11
doc.: IEEE 802.11-11/0489r0
Submission
Portable Networks – Average Number of WLAN Channels
• Average (Mean) number of 10/20 MHz WLAN Channels
PHY Mean Number of 10 MHz WLAN Channels
10 5.4
5+5 8.4
PHY Mean Number of 20 MHz WLAN Channels
20 1.4
10+10 2.5
5+5+5+5 4.0
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 12
doc.: IEEE 802.11-11/0489r0
Submission
Fixed/Portable Nets – Number of 10 MHz WLAN Channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 13
doc.: IEEE 802.11-11/0489r0
Submission
Fixed/Portable Nets – Number of 20 MHz WLAN Channels
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 14
doc.: IEEE 802.11-11/0489r0
Submission
Fixed/Portable Nets – Average Number of WLAN Channels
• Average (Mean) number of 10/20 MHz WLAN Channels
PHY Mean Number of 10 MHz WLAN Channels
10 2.2
5+5 3.6
PHY Mean Number of 20 MHz WLAN Channels
20 0.68
10+10 0.93
5+5+5+5 1.5
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 15
doc.: IEEE 802.11-11/0489r0
Submission
Conclusions• 20 MHz WLAN Channels
– Very unlikely to have 20 MHz continuous
– Must use either 10+10 PHY or 5+5+5+5 PHY
– 10+10 PHY will have carrier sense coexistence problems with 5MHz PHY
– 5+5 PHY will not have carrier sense coexistence problem with 5MHz PHY
• 10 MHz WLAN Channels– Reasonable number of 10 MHz channels using adjacent channels
– 10 MHz PHY will have carrier sense coexistence problem with 5MHz PHY
– If we use 5+5 PHY there are about 50% more 10MHz channels, on the average
– 5+5 PHY will not have carrier sense coexistence problem with 5MHz PHY
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 16
doc.: IEEE 802.11-11/0489r0
Submission
References
1. Mubaraq Mishra and Anant Sahai, “How much white space is there?” EECS Department, University of California, Berkeley, Technical Report No. UCB/EECS-2009-3, January 11, 2009 (available at http://www.eecs.berkeley.edu/Pubs/TechRpts/2009/EECS-2009-3.html)
Steve Shellhammer, Qualcomm Inc.Slide 17
March 2011
doc.: IEEE 802.11-11/0489r0
Submission
AnnexStudy of 50 Largest Cities in the US
March 2011
Steve Shellhammer, Qualcomm Inc.Slide 18
doc.: IEEE 802.11-11/0489r0
Submission
Portable 10 MHz Channel Results – Cities 1-20City Zip Code Number of 10 MHz Channels