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Effect of CCA in residential scenario part 2

Effect of CCA in residential scenario part 2. Date: 2014-09-15. Authors:. 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

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Effect of CCA in residential scenario part 2

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  1. Effect of CCA in residential scenario part 2 Date: 2014-09-15 Authors:

  2. Multiple IEEE presentations have looked at the effects of CCA levels • Several presentationshave 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 Indroduction Qualcomm

  3. 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 Simulation Setting I Example of one drop Floor 1 Floor 2 Floor 3 Qualcomm

  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 Simulation Setting II Qualcomm

  5. 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] Reuse 3(Three channels: Red, Blue and Green) 26 29 25 27 28 20 23 21 22 24 15 18 16 17 19 12 10 11 13 14 7 5 6 8 9 0 1 2 3 4 Qualcomm

  6. 5%ile • 3x improvements vs -92dBm • 4x improvements vs -82dBm • Mean • 30% increase vs -92dBm • No gain compared to -82dBm Reuse 3 results UL 5 STAs per AP Qualcomm

  7. 5%ile • 7x increase vs CCA= -92dBm • 3x increase if baseline is -82dBm • Mean • 76% increase vs CCA= -92dBm • 20%increase vs -82dBm Reuse 3 results cont. UL 1 STAs per AP Note: Results in the table are divided by 5 so they can be compared to the 5 STA per AP case Qualcomm

  8. 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] Reuse 6 (Six channels: Red, Blue, Yellow, Purple, Green and Gray) Qualcomm

  9. 5%ile • No gain if baseline is -82 • 4x gain if baseline is -92 • Mean: no difference Reuse 6 results UL 5 STAs per AP 6 40 MHz channels Qualcomm

  10. 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 Reuse 6 results cont. UL 1 STAs per AP 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 6 40 MHz channels Qualcomm

  11. 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 Conclusions Qualcomm

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