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doc.: 11-14-0846-00-00ax
Submission
July 2014
Slide 1
Proposed Calibration For MAC simulatorDate: 2014-07-12
Name Company Address Phone email Gwen Barriac Qualcomm 5775 Morehouse Drive
San Diego
Simone Merlin Qualcomm 5775 Morehouse Drive San Diego
George Cherian Qualcomm 5775 Morehouse Drive San Diego
Authors:
doc.: 11-14-0846-00-00ax
Submission
Introduction
• Multiple IEEE presentations have looked at the effects of CCA levels. – See next slide
– Many claim significant gain by increasing CCA levels.
– Numerous types of scenarios/simulators were used to make these claims– PHY simulator
– Real devices
– MAC simulator/scenario 3
• This presentation focuses on understanding the effect of changing CCA levels in a residential scenario ( scenario 1)
– Simulations are done with a MAC simulator• Detailed MAC modelled
• Simple PHY abstraction
– Optimal CCA levels for both mean and 5% TPUT are found for a variety of settings.
July 2014
Barriac et al (Qualcomm)Slide 2
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Submission
Previous Contributions on CCA levels
July 2014
Barriac et al (Qualcomm)Slide 3
Document # Company Title Notes11-14/0628r0 SK telecom measurements on CCA Thresholds in
OBSS environmentsincreasing CCA can help target APs overcome deferral due to ACI interference in dense setting. ( experimental results)
11-14/0578r0 Interdigital Residential Scenario CCA/TCPsimulation Discussion
Optimal CCA for mean TPUT varies with Txpower, and reuse.
11-14/0523r0 Orange MAC simulations results for Dynamic sensitivity Control ( CCA adaptation) and tranmist power control
CCA and TCP are strongly increasing reuse and aggregate throughput
11-14/0635r1 DSP Group Dynamic Sensitivity Control implementation
CCA level per STA depends on distance to AP.
11-14/0082r0 & 83r0 Bcom Improved Spatial Reuse Feasibility part I & II
2x-3x gains in both the mean and tail by increasing CCA levels.
Densifi: date: 2014-06-04
Bcom performacne Gains from CCA Optimiziation
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Submission
Simulation Setting I
July 2014
Barriac et al (Qualcomm)Slide 4
• Residential Scenario– IEEE residential scenario
baseline• Less apartments modelled
for faster run times– Expect comclusions will
not change
• 1 STA per AP– 2x5x3 apartments– 30 APs ; 30STAs ; – Pathloss as specified in
11ax Simulation Scenarios document
– 1 80 MHz channel– Results averaged over
multiple random drops of APs and STAs locations
Floor 1
Floor 2
Example of one drop
Floor 3
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Submission
Simulation Setting II• Simulation Details:
– DL only Data traffic (+ UL BAs) – Full buffer UDP– Default Tx Power: 20 dBm per antenna (AP), 15 dBm ( STA) – Antenna Gain: 0 dBi APs, -2dBi STAs– Rate Control:
• MCS per link chosen to maximize long term goodput
– MAC modelling• MAC is fully modelled• Deferral according to 11ah CCA rules
– OBSS packets deferral only if RSSI > ED (assume BSS ID (color) in PPDU
• ED level controls deferral on a network level
• Nodes on the same 80 MHz channel have the same primary channel
– PHY modelling• Pathloss, shadowing, (pathloss as in SS document, shadowing w sd 5dB)• no fading. • Long term PER curves based on ChD• 1x1 (tx antennas x rx antennas)
July 2014
Barriac et al (Qualcomm)Slide 5
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Submission
Tests Run
• Using ChD PER curves:– Reuse 1 default power levels
– Reuse 1, 6 dB higher tx power levels• 6 dB higher power models total power when 4 antennas
• Using AWGN PER curves:– Reuse 1 default power levels
– Reuse 1, 6dB higher tx power levels• 6 dB higher power models total power when 4 antennas.
July 2014
Barriac et al (Qualcomm)Slide 6
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Submission
RESULTS WITH CHD PER CURVES
July 2014
Gwen Barriac (Qualcomm)Slide 7
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Submission
TPUT as a function of CCA for Reuse 1
July 2014
Barriac et al (Qualcomm)Slide 8
• Optimal CCA for mean: -72
• Optimal CCA for 5% point: -92
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.00 10.85 103.30 35.25
-62 0.09 23.44 109.25 40.35
-72 1.27 30.32 107.2 45.63
-82 2.82 30.97 100.84 44.65
-92 4.50 24.54 74.98 33.08
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Submission
TPUT as a function of CCA for Reuse 1, with 6 dB higher Tx Power at both AP and STA
July 2014
Barriac et al (Qualcomm)Slide 9
• Optimal CCA for mean: -72
• Optimal CCA for 5% point: -82
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.01 8.66 105.55 34.61
-62 0.18 26.78 120.97 45.28
-72 2.34 31.27 109.50 46.43
-82 2.76 27.37 102.50 43.07
-92 1.78 23.91 61.06 29.79
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Submission
Possible Simultaneous mean & 5% TPUT
July 2014
Qualcomm Slide 10
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.00 10.85 103.30 35.25
-62 0.09 23.44 109.25 40.35
-72 1.27 30.32 107.2 45.63
-82 2.82 30.97 100.84 44.65
-92 4.50 24.54 74.98 33.08
CCA level 5% tput Loss compared to optimal
Mean tput loss compared to optimal
-92 0 26%
-82 37% 2%
-72 71% 0%
-62 99% 11%
-52 100% 22%
Reuse 1, default Tx Power , chD PER curves
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Submission
Summary of Results so far ( chD PER curves)
July 2014
Barriac et al (Qualcomm)Slide 11
Reuse 1 default TX power
Reuse 1 6 dB Higher Tx power
Optimal CCA for mean -72 -72
Optimal CCA for 5% -92 -82
• For default power case, the optimal mean TPUT comes with a 70% loss
in 5% point. – It can be difficult to optimize for both mean and 5% point simultaneously.
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Submission
RESULTS WITH AWGN PER CURVES
Note: Chan D curves better reflect reality. AWGN curves run for understanding of how simulator reacts in different settings.
Slide 12Qualcomm
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Submission
Reuse 1, Default TX power AWGN curves.
July 2014
Barriac et al (Qualcomm)Slide 13
• Optimal CCA for mean: -62
• Optimal CCA for 5% point: -92
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.00 15.03 158.73 52.21
-62 0.00 30.09 170.16 62.05
-72 1.19 41.85 146.50 60.38
-82 4.67 40.63 116.73 53.21
-92 4.79 25.46 80.36 35.84
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Submission
Reuse 1, 6 dB higher Tx Power , AWGN curves
July 2014
Barriac et al (Qualcomm)Slide 14
• Optimal CCA for mean: -62
• Optimal CCA for 5% point: -82
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.00 10.29 177.21 55.50
-62 0.21 36.59 169.71 64.05
-72 3.63 41.80 133.96 57.99
-82 4.49 33.44 107.61 47.54
-92 2.94 26.38 59.35 30.91
doc.: 11-14-0846-00-00ax
Submission
Possible Simultaneous mean & 5% TPUT
July 2014
Barriac et al (Qualcomm)Slide 15
Reuse 1, 6 dB higher Tx Power , AWGN curves
CCA level 5% tput Loss compared to optimal
Mean tput loss compared to optimal
-92 34% 51%
-82 0 % 26%
-72 19% 11%
-62 95% 0%
-52 100% 14%
CCA level 5 percentile 50 percentile 90 percentile mean
-52 0.00 10.29 177.21 55.50
-62 0.21 36.59 169.71 64.05
-72 3.63 41.80 133.96 57.99
-82 4.49 33.44 107.61 47.54
-92 2.94 26.38 59.35 30.91
doc.: 11-14-0846-00-00ax
Submission
Summary of Results w/ AWGN
July 2014
Barriac et al (Qualcomm)Slide 16
Reuse 1 default TX power
Reuse 1 6 dB Higher Tx power
Optimal CCA for mean -62 -62
Optimal CCA for 5% -92 -82
• Difficult to optimize for both mean and 5% point simultaneously.– Optimal mean can come with 95% loss in 5% point
doc.: 11-14-0846-00-00ax
Submission
Comparison of Optimal CCA levels for AWGN and Chan D PER curves
July 2014
Barriac et al (Qualcomm)Slide 17
Reuse 1 default TX powerChannel D PER curves
Reuse 1 6 dB Higher Tx powerChannel D PER curves
Reuse 1 default TX powerAWGN curves
Reuse 1 6 dB higher TX powerAWGN curves
Optimal CCA for mean
-72 -72 -62 -62
Optimal CCA for 5%
-92 -82 -92 -82
• Changing PER curves has large effect on optimal CCA level for mean• Changing Power level also affects optimal CCA • Optimal CCA level sensitive to parameters.
doc.: 11-14-0846-00-00ax
Submission
Conclusions:
• Optimal CCA levels are highly dependent on parameter settings– example, Tx Power, PER curves
• Difficult to get simultaneously optimize both mean and 5% point
July 2014
Barriac et al (Qualcomm)Slide 18
doc.: 11-14-0846-00-00ax
Submission
Additional Considerations
• We would like to propose that the rate control used in these studies be included in the EM document for use with the MAC simulator and integrated simulator. – See document xxxxx
• We would also like to propose that the deferral method used in these studies be used for the next stage of MAC simulator calibration.
July 2014
Barriac et al (Qualcomm)Slide 19