Simulation results for January 2015 Simulation results for Box 5 calibration Date: 2015-01-12 Authors: Name Affiliations Address Phone Email Suhwook Kim LG Electronics 19, Yangjea-daero 11gil, Seocho-gu, Seoul 137-130, Korea +82-2-6912-6589 suhwook.kim@lge.com Wookbong Lee wookbong.lee@lge.com Giwon Park giwon.park@lge.com Jeongki Kim jeongki.kim@lge.com Kiseon Ryu kiseon.ryu@lge.com HanGyu Cho hg.cho@lge.com Suhwook Kim, LG Electronics

Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2015 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 Electronics John Doe, Some Company

Box-5 Calibration [1] Box 0, 1, and 2 calibration are almost done January 2015 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 Electronics

Box-5 PHY Details [2] January 2015 PHY parameters BW All BSSs at 5GHz [80 MHz, no dynamic bandwidth] Channel model TGac D NLOS per link Shadow fading iid 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 Power 15 dBm per antenna  AP TX Power 20 dBm  per antenna AP number of TX/RX antennas 1/1 STA number of TX /RX antennas AP antenna gain 0 dBi STA antenna gain -2 dBi Noise Figure 7dB CCA threshold -70dBm (measured across the entire bandwidth after large-scale fading) Rx sensitivity -82dBm (a packet with lower rx power is dropped) Link Adaption Fixed MCS =7 (292.5 Mbps) Channel estimation ideal PHY abstraction RBIR, BCC [1, 5] Channel correlation Independent or time-correlated channel per packet Suhwook Kim, LG Electronics

Box-5 MAC Details [2] January 2015 100 drops per simulation MAC parameters Access protocol [EDCA, AC_BE with default parameters] [CWmin = 15, CWmax = 1023, AIFSn=3 ] Queue length A single queue for each traffic link is set inside AP/STA sized of 2000 packets Traffic type UDP CBR with rate 10^8bps (may not enough to model full buffer) MPDU size 1540 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 retries 10 Beacon Disabled RTS/CTS OFF Traffic direction UL Only, DL only Throughput metric CDF 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) Suhwook Kim, LG Electronics

11ac Scenario 6 – OBSS Enterprise [2][3] January 2015 11ac Scenario 6 – OBSS Enterprise [2][3] Fixed Location and Association 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) 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) Suhwook Kim, LG Electronics

Traffic Flow Model [2][3] January 2015 Traffic Flow Model [2][3] DL/UL traffic assigned for each STA STA DL UL STA1 y STA23 n STA2 STA25 STA4 STA26 STA5 STA28 STA7 STA29 STA8 STA3 STA10 STA9 STA11 STA15 STA13 STA21 STA14 STA27 STA16 STA6 STA17 STA12 STA19 STA18 STA20 STA24 STA22 STA30 Suhwook Kim, LG Electronics

Updated simulator Take the whole preamble as a standalone sub-frame January 2015 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 Electronics

Updated simulator - continued January 2015 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 Electronics

One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) January 2015 One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) UL only & DL only, UDP CBR with rate 10^8bps Total Tput UL: 206.66 Mbps DL: 254.93 Mbps Suhwook Kim, LG Electronics

One BSS Test Result Comparison with old version result January 2015 DL only UL only Old version simulator New version simulator STA3 50.58 51.05 (+0.47) 36.63 36.83 (+0.20) STA9 50.59 50.97 (+0.38) 42.11 39.86 (-2.25) STA15 50.64 51.11 48.67 48.95 (+0.28) STA21 50.46 50.70 (+0.24) 44.74 42.00 (-2.74) STA27 50.56 51.10 (+0.55) 45.80 39.01 (-6.79) Sum 252.83 254.93 (+2.10) 217.95 206.66 (-11.30) Suhwook Kim, LG Electronics

One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) January 2015 One BSS Test Result BSS B (STAs 3, 9, 15, 21, 27) Mixed DL&UL, UDP CBR with rate 10^8bps Total Tput: 207.48 Mbps DL: 31.17 Mbps UL: 176.31 Mbps Suhwook Kim, LG Electronics

January 2015 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% ↓) note: 5/6=0.83, 1/6=0.17 Suhwook Kim, LG Electronics

January 2015 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 # of Interferer frames transmitted by STAi pd, i = x 100 # of total frames transmitted by STAi # of success subframes transmitted by STAi psucc, i = x 100 # of Interfered frames transmitted by STAi # of total subframes transmitted by STAi pr, i = x 100 # of total frames transmitted by STAi Suhwook Kim, LG Electronics

January 2015 Observations Throughput pd, i pr, i psucc, i STA3 36.83 Mbps 6.30 % 6.27 % 60.6 % STA9 39.86 Mbps 5.93 % 5.90 % 63.6 % STA15 48.95 Mbps 4.55 % 4.58 % 70.2 % STA21 42.00 Mbps 5.53 % 5.49 % 64.5 % STA27 39.01 Mbps 6.07 % 6.16 % 62.6 % All station occasionally suffers from interference caused by hidden terminal In general, probability is higher as distance is longer Direction also affects the interference probability and throughput Suhwook Kim, LG Electronics

Three BSSs Test UL only January 2015 BSS C Total Tput: 148.61 Mbps BSS B Total Tput: 112.87 Mbps BSS A Total Tput: 83.84 Mbps Suhwook Kim, LG Electronics

Three BSSs Test DL only January 2015 BSS B Total Tput: 178.01 Mbps BSS C Total Tput: 172.28 Mbps DL only BSS A Total Tput: 15.87 Mbps Suhwook Kim, LG Electronics

Three BSSs Test Result Comparison with old version result January 2015 UL only DL only Old version simulator New version simulator BSS A 61.88 83.84 (35% ↑) 75.22 15.87 (79% ↓) BSS B 99.29 112.87 (14% ↑) 117.24 178.01 (52% ↑) BSS C 115.47 148.61 (29% ↑) 110.15 172.28 (56% ↑) Sum 276.64 345.32 (25% ↑) 302.61 366.16 (21% ↑) Suhwook Kim, LG Electronics

Observations In UL only case, all BSS shows better performance January 2015 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 total idle time sensed by APi # of total frames transmitted by APi It, i = x 100 Nt, i = total simulation time (500 sec) total simulation time (500 sec) # of subframes transmitted by APi # of success subframes transmitted by APi x 100 AVERf, i = psucc, i = # of frames transmitted by APi # of total subframes transmitted by APi Suhwook Kim, LG Electronics

Observations In DL only case January 2015 Observations In DL only case BSS B and C are frequently divided in 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 Throughput Nt, i It, i AVERf, i psucc, i BSS A 15.87 Mbps 67.2 0.74 % 28.5 64.7 % BSS B 178.01 Mbps 598.7 3.73 % 31.8 82.3 % BSS C 172.28 Mbps 600.4 3.61 % 31.6 74.8 % Suhwook Kim, LG Electronics

January 2015 Conclusion In this submission, we provided updated simulation results for Box 5 calibration We used some additional parameters for performance analysis It might be helpful for calibration procedure Suhwook Kim, LG Electronics

Reference [1] 11-14/0571r5 Evaluation Methodology January 2015 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 Electronics