1. doc.: IEEE 802.11-14/1392r3 SubmissionSuhwook Kim, LG ElectronicsSlide 1 Simulation results for Box 5 calibration Date: 2015-01-12 Authors: NameAffiliationsAddressPhoneEmail Suhwook KimLG Electronics 19, Yangjea-daero 11gil, Seocho-gu, Seoul 137-130, Korea +82-2-6912-6589suhwook.kim@lge.com Wookbong LeeLG Electronicswookbong.lee@lge.com Giwon ParkLG Electronicsgiwon.park@lge.com Jeongki KimLG Electronicsjeongki.kim@lge.com Kiseon RyuLG Electronicskiseon.ryu@lge.com HanGyu ChoLG Electronicshg.cho@lge.com January 2015

2. doc.: IEEE 802.11-14/1392r3 Submission Abstract This submission provides updated simulation results for Box-5 calibration –We updated simulator based on 1523r2 which was agreed in November meeting [4] Suhwook Kim, LG ElectronicsSlide 2 January 2015

3. doc.: IEEE 802.11-14/1392r3 Submission Box-5 Calibration [1] Box 0, 1, and 2 calibration are almost done Box 3 calibration is now in progress Box 5 calibration was initially discussed in previous meeting –Box 5: Integrated system simulator calibration –The objective is to align a combination of all PHY and MAC features Suhwook Kim, LG ElectronicsSlide 3 January 2015

4. doc.: IEEE 802.11-14/1392r3 Submission Box-5 PHY Details [2] Suhwook Kim, LG ElectronicsSlide 4 PHY parameters BWAll BSSs at 5GHz [80 MHz, no dynamic bandwidth] Channel modelTGac D NLOS per link Shadow fadingiid log-normal shadowing (5 dB standard deviation) per link Data Preamble Type [5GHz, 11ac], always decoded correctly after successful reception, duration is considered. STA TX Power15 dBm per antenna AP TX Power20 dBm per antenna AP number of TX/RX antennas1/1 STA number of TX /RX antennas1/1 AP antenna gain0 dBi STA antenna gain-2 dBi Noise Figure7dB CCA threshold-70dBm (measured across the entire bandwidth after large-scale fading) Rx sensitivity-82dBm (a packet with lower rx power is dropped) Link AdaptionFixed MCS =7 (292.5 Mbps) Channel estimationideal PHY abstractionRBIR, BCC [1, 5] Channel correlationIndependent or time-correlated channel per packet January 2015

5. doc.: IEEE 802.11-14/1392r3 Submission Box-5 MAC Details [2] Suhwook Kim, LG ElectronicsSlide 5 MAC parameters Access protocol[EDCA, AC_BE with default parameters] [CWmin = 15, CWmax = 1023, AIFSn=3 ] Queue lengthA single queue for each traffic link is set inside AP/STA sized of 2000 packets Traffic typeUDP CBR with rate 10^8bps (may not enough to model full buffer) MPDU size1540 Bytes (1472 Data + 28 IP header + 40 MAC header) Aggregation [A-MPDU / max aggregation size / BA window size, No A-MSDU, with immediate BA], Max aggregation: 64 MPDUs with 4-byte MPDU delimiter Max number of retries10 BeaconDisabled RTS/CTSOFF Traffic direction UL Only, DL only Throughput metricCDF or Histogram of per non-AP STA throughput (received bits/overall simulation time) 100 drops per simulation 1 drop = 5 seconds (+ 1 second for initial running) January 2015

6. doc.: IEEE 802.11-14/1392r3 Submission 11ac Scenario 6 – OBSS Enterprise [2][3] Suhwook Kim, LG ElectronicsSlide 6 AP A(0,0) AP B(40,20) AP C(-40,-20) STA3 (7.5+xb, ‑ 9.5+yb) STA9(7+xb, -7.5+yb) STA15(3+xb, -0.5+yb) STA21(-6.5+xb, -3+yb) STA27 ( ‑ 6+xb, 2.5+yb) STA6(-5.5+xc,4.5+yc) STA12(7+xc,7+yc) STA18(10+xc,0.5+yc) STA24(3+xc,2.5+yc) STA30(9.5+xc,3.5+yc) STA1(5,-9.5) STA2(3.5,7.5) STA4(-4.5,0.5) STA5(-1.5,6) STA7(-9,-5) STA8(-8.5,8.5) STA10(-3,0.5) STA11(-0.5,8) STA13(-4,-4) STA14(7.5,-1) STA16(8,-6) STA17(0,-7.5) STA19(-2.5,-4.5) STA20(0.5,-2) STA22(0,-4.5) STA23(-1.5,7) STA25(3.5,-5) STA26(9,9.5) STA28(-8,-5.5) STA29(1.5,3.5) Fixed Location and Association January 2015

7. doc.: IEEE 802.11-14/1392r3 Submission Traffic Flow Model [2][3] DL/UL traffic assigned for each STA Suhwook Kim, LG ElectronicsSlide 7 STADLULSTADLUL STA1yySTA23ny STA2yySTA25yy STA4yySTA26yy STA5yySTA28yy STA7yySTA29yy STA8yySTA3yy STA10ynSTA9yn STA11ynSTA15yn STA13ynSTA21ny STA14ynSTA27yy STA16ynSTA6yy STA17ynSTA12yn STA19ynSTA18yn STA20ynSTA24ny STA22nySTA30yy January 2015

8. doc.: IEEE 802.11-14/1392r3 Submission Updated simulator Take the whole preamble as a standalone sub-frame –Preamble decoding modeled as a sub-frame decoding –Preamble is legacy + VHT in Data frame and only legacy in Control frame –Legacy + VHT: decoding depends on VHT-SIG-A –Legacy only: decoding depends on L-SIG RBIR-based PHY abstraction –Each MPDU is decoded individually by weakest link (Option 2) Control frame –Opt 2: decoding error modeled as a sub-frame decoding –Take the whole control frame as a standalone sub-frame –For calibration, MCS0 is used for control frames Suhwook Kim, LG ElectronicsSlide 8 January 2015

9. doc.: IEEE 802.11-14/1392r3 Submission Updated simulator - continued Receiver will be locked by the first-arrived packet, and later-arrived packets are considered as interference –i.e. window size = 0 (for calibration) If preamble passes, the receiver continues to receive the rest part of the packet, i.e., to decode each MPDU; –If successfully decoding of a control frame, defer for NAV; –Otherwise, set CCA to busy for the entire PPDU duration if rx power higher than rx sensitivity (=CCA-SD) If preamble fails, the receiver terminates current reception –The entire PPDU fails –The receiver is unlocked again and CCA-ED threshold is used to determine if the medium is busy. Suhwook Kim, LG ElectronicsSlide 9 January 2015

10. doc.: IEEE 802.11-14/1392r3 Submission One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) –UL only & DL only, UDP CBR with rate 10^8bps Suhwook Kim, LG ElectronicsSlide 10 Total Tput UL: 206.66 Mbps DL: 254.93 Mbps January 2015

11. doc.: IEEE 802.11-14/1392r3 Submission One BSS Test Result Comparison with old version result Suhwook Kim, LG ElectronicsSlide 11 January 2015 DL onlyUL only Old version simulator New version simulator Old version simulator New version simulator STA350.58 51.05 (+0.47) 36.63 36.83 (+0.20) STA950.59 50.97 (+0.38) 42.11 39.86 (-2.25) STA1550.64 51.11 (+0.47) 48.67 48.95 (+0.28) STA2150.46 50.70 (+0.24) 44.74 42.00 (-2.74) STA2750.56 51.10 (+0.55) 45.80 39.01 (-6.79) Sum252.83 254.93 (+2.10) 217.95 206.66 (-11.30)

12. doc.: IEEE 802.11-14/1392r3 Submission One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) –Mixed DL&UL, UDP CBR with rate 10^8bps Suhwook Kim, LG ElectronicsSlide 12 Total Tput: 207.48 Mbps UL: 31.17 Mbps DL: 176.31 Mbps January 2015

13. doc.: IEEE 802.11-14/1392r3 Submission Observations New DL throughput results show very similar with old version –Major change is receiving procedure in collision, however, there is no collision in DL only case Mixed DL&UL looks simply addition and scaling of DL only and UL only –DL throughput: 252.83 Mbps → 31.17 Mbps (87%↓) –UL throughput: 217.95 Mbps → 176.31 Mbps (19% ↓) Suhwook Kim, LG ElectronicsSlide 13 January 2015 note: 5/6=0.83, 1/6=0.17

14. doc.: IEEE 802.11-14/1392r3 Submission Observations On the other hand, some STAs show different UL throughput from old version –Location of each STA may be key factor of this difference –All STA can be hidden from others because of channel variation –Following parameters may be useful to analyze collision events Suhwook Kim, LG ElectronicsSlide 14 January 2015 # of Interferer frames transmitted by STA i # of total frames transmitted by STA i # of Interfered frames transmitted by STA i # of total frames transmitted by STA i p d, i = p r, i = # of success subframes transmitted by STA i # of total subframes transmitted by STA i p succ, i = x 100

15. doc.: IEEE 802.11-14/1392r3 Submission Observations –All station occasionally suffers from interference caused by hidden terminal In generally, probability is higher as distance is longer Direction also affects the interference probability and throughput Suhwook Kim, LG ElectronicsSlide 15 January 2015 Throughputp d, i p r, i p succ, i STA336.83 Mbps6.30 %6.27 %60.6 % STA939.86 Mbps5.93 %5.90 %63.6 % STA1548.95 Mbps4.55 %4.58 %70.2 % STA2142.00 Mbps5.53 %5.49 %64.5 % STA2739.01 Mbps6.07 %6.16 %62.6 %

16. doc.: IEEE 802.11-14/1392r3 Submission Three BSSs Test UL only Suhwook Kim, LG ElectronicsSlide 16 BSS A Total Tput: 83.84 Mbps BSS B Total Tput: 112.87 Mbps BSS C Total Tput: 148.61 Mbps January 2015

17. doc.: IEEE 802.11-14/1392r3 Submission Three BSSs Test DL only Suhwook Kim, LG ElectronicsSlide 17 BSS A Total Tput: 15.87 Mbps BSS B Total Tput: 178.01 Mbps BSS C Total Tput: 172.28 Mbps January 2015

18. doc.: IEEE 802.11-14/1392r3 Submission Three BSSs Test Result Comparison with old version result Suhwook Kim, LG ElectronicsSlide 18 January 2015 UL onlyDL only Old version simulator New version simulator Old version simulator New version simulator BSS A61.88 83.84 (35% ↑) 75.22 15.87 (79% ↓) BSS B99.29 112.87 (14% ↑) 117.24 178.01 (52% ↑) BSS C115.47 148.61 (29% ↑) 110.15 172.28 (56% ↑) Sum276.64 345.32 (25% ↑) 302.61 366.16 (21% ↑)

19. doc.: IEEE 802.11-14/1392r3 Submission Observations In UL only case, all BSS shows better performance –Especially, BSS A shows the largest performance enhancement In DL only case, all BSS except BSS A shows better performance –BSS A has very poor performance (almost 80% degradation) Areal performance is improved by at least 20% from old version Following parameters will be used for analysis Suhwook Kim, LG ElectronicsSlide 19 January 2015 # of total frames transmitted by AP i # of subframes transmitted by AP i # of frames transmitted by AP i N t, i = AVER f, i = # of success subframes transmitted by AP i # of total subframes transmitted by AP i p succ, i = x 100 total simulation time (500 sec) total idle time sensed by AP i I t, i = total simulation time (500 sec) x 100

20. doc.: IEEE 802.11-14/1392r3 Submission Observations In DL only case –BSS B and C are frequently divided spatial domain Between BSS B and C, channel is almost BUSY whenever AP A senses channel, so AP A couldn’t get TXOP easily –Number of subframes in one AMPDU is smaller in BSS A It affects the throughput performance –Also direction (location) of stations is consideration factor Suhwook Kim, LG ElectronicsSlide 20 January 2015 ThroughputN t, i I t, i AVER f, i p succ, i BSS A15.87 Mbps 67.20.74 %28.564.7 % BSS B178.01 Mbps 598.73.73 %31.882.3 % BSS C172.28 Mbps 600.43.61 %31.674.8 %

21. doc.: IEEE 802.11-14/1392r3 Submission Conclusion In this submission, we provided updated simulation results for Box 5 calibration We used some addition parameters for performance analysis –It might be helpful for calibration procedure Suhwook Kim, LG ElectronicsSlide 21 January 2015

22. doc.: IEEE 802.11-14/1392r3 Submission Reference [1] 11-14/0571r5 Evaluation Methodology [2] 11-14/1177r2 Box5 Calibration Discussion [3] 11-09/0451r16 TGac Functional Requirements and Evaluation Methodology [4] 11-14/1523r2 Offline Discussion Minutes of SLS Calibration Suhwook Kim, LG ElectronicsSlide 22 January 2015