1. doc.:11-14-1199-01-00ax Submission Sept 2014 Slide 1 Effect of CCA in residential scenario part 2 Date: 2014-09-15 Authors:

2. doc.:11-14-1199-01-00ax Submission Indroduction Multiple IEEE presentations have looked at the effects of CCA levels – Several presentations have noted that higher CCAs have higher mean and 5% tputs than lower CCAs Note: Baselines of both CCA = -82 and CCA= -92 have been used At the June IEEE meeting, we presented results for various CCA levels using a reuse 1 residential scneario – document 11-14-0846 –We found that higher CCA levels were often harmful for the 5% point In this presentation we look at the residential scenario for reuse 3 and 6 September 2014 QualcommSlide 2

3. doc.:11-14-1199-01-00ax Submission Simulation Setting I Residential Scenario –IEEE residential scenario baseline Less apartments modelled for faster run times – Expect conclusions will not change –2x5x3 apartments –30 APs 150 STAs (5 STAs per AP) –Pathloss as specified in 11ax Simulation Scenarios document –Reuse-3: 3x80 MHz channel –Reuse-6: 6x40MHz channel Note: all results are generated by simulating 80MHz BSS and then are appropriately scaled –Results averaged over multiple random drops of APs and STAs locations September 2014 QualcommSlide 3 Floor 1 Floor 2 Floor 3 Example of one drop

4. doc.:11-14-1199-01-00ax Submission Simulation Setting II September 2014 QualcommSlide 4 Simulation Details: –UL only Data traffic (+ DL ACKs) –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, shadowning w sd 5dB) no fading. Long term PER curves based on AWGN

5. doc.:11-14-1199-01-00ax Submission Reuse 3 (Three channels: Red, Blue and Green) Channel Coloring: –No two APs that have the same channel share a floor/wall –For each AP, there are no more than 3 other APs that have the same channel and are within 2 (wall/floor)s penetration. Red Channel –AP = [2,5,8,10,13,16,19,21,24,27] Blue Channel –AP = [0,3,6,9,11,14,17,22,25,28] Green Channel –AP = [1,4,7,12,15,18,20,23,26,29] September 2014 QualcommSlide 5 2 58 1013 1619 2124 27 03 69 1114 17 22 2528 14 7 12 15 18 20 26 23 29

6. doc.:11-14-1199-01-00ax Submission Reuse 3 results 5%ile 3x improvements vs -92dBm 4x improvements vs -82dBm Mean 30% increase vs -92dBm No gain compared to -82dBm September 2014 Qualcomm Slide 6 UL 5 STAs per AP CCA5%tile50%tile90%tilemean -521.5835.6178.8238.72 -622.7534.6074.8038.52 -723.8836.4482.2139.79 -820.8430.0984.0239.22 -921.2118.2380.0329.57

7. doc.:11-14-1199-01-00ax Submission Reuse 3 results cont. September 2014 QualcommSlide 7 5%ile –7x increase vs CCA= -92dBm –3x increase if baseline is -82dBm Mean –76% increase vs CCA= -92dBm –20%increase vs -82dBm UL 1 STAs per AP CCA5%50%90%mean -52 6.7745.1567.4642.34 -62 7.4246.6267.5343.36 -72 9.7547.9867.5344.97 -82 3.1235.5767.3137.50 -92 1.3423.6651.8025.63 Note: Results in the table are divided by 5 so they can be compared to the 5 STA per AP case

8. doc.:11-14-1199-01-00ax Submission Reuse 6 (Six channels: Red, Blue, Yellow, Purple, Green and Gray) Channel Coloring: –No two APs that have the same channel are within two floors/walls penetration Red Channel –AP = [6,9,10,13,27] Blue Channel –AP = [1,4,17,20,23] Green Channel –AP = [0,3,16,19,22] Yellow Channel –AP = [2,15,18,21,24] Purple Channel –AP = [5,8,12,26,29] Gray Channel –AP = [7,11,14,25,28] September 2014 QualcommSlide 8

9. doc.:11-14-1199-01-00ax Submission Reuse 6 results September 2014 QualcommSlide 9 UL 5 STAs per AP 5%ile –No gain if baseline is -82 –4x gain if baseline is -92 Mean: no difference CCA5%50%90%mean -5210.5428.1250.7630.03 -6210.3427.5051.8629.80 -7211.3729.5649.1930.54 -8212.4929.4949.2530.73 -923.5426.9656.7529.67 6 40 MHz channels

10. doc.:11-14-1199-01-00ax Submission Reuse 6 results cont. 5%ile –Significant improvement possible compared to -92dBm baseline In this scenario, some STAs suffer from the ‘exposed terminal’ issue when -92dBm is used –No gain if baseline is CCA=-82dBm Mean – 20% gain by going from CCA=-92dBm to anything else No gain if baseline is CCA -82dBm September 2014 QualcommSlide 10 CCA5%50%90%mean -52 20.6633.1533.7830.51 -62 20.9033.6733.7930.67 -72 21.0333.7433.8131.44 -82 20.9533.7433.8031.94 -92 1.1128.0133.7424.42 UL 1 STAs per AP 6 40 MHz channels Note: Plots are obtained with 80MHz simulations, then result in the table are scaled to emulate 40MHz. Further they are divided by 5 just for easier comparison with the 5STA per AP case

11. doc.:11-14-1199-01-00ax Submission Conclusions For residential scenario reuse 1: – Increasing CCA can be harmful for the 5% throughput (from 11-14-0846) For residential scenario reuse 3: –Gains with increased CCA depend on what is assumed as baseline 5 STAs –5%ile: 3x improvements vs -92dBm; 4x improvements vs -82dBm –Mean: 30% increase vs CCA=-92 to CCA= anything higher; No gain compared to -82dBm 1 STA –5%: 7x increase vs CCA= -92; 3x increase if baseline is -82 –Mean: 76% increase vs CCA= -92; 20%increase vs -82 dBm For residential scenario reuse 6 –No gains by increasing CCA (except one special case) All CCA levels have good reuse Effects of changing the CCA levels is highly scenario and parameters dependent September 2014 QualcommSlide 11