Doc.: IEEE 802.11-14/1392r3 SubmissionSuhwook Kim, LG ElectronicsSlide 1 Simulation results for Box 5 calibration Date: 2015-01-12 Authors: NameAffiliationsAddressPhoneEmail.

doc.: IEEE 802.11-14/1392r3

Submission Suhwook Kim, LG ElectronicsSlide 1

Simulation results for Box 5 calibration

Date: 2015-01-12Authors:

Name Affiliations Address Phone EmailSuhwook Kim LG Electronics

19, Yangjea-daero 11gil, Seocho-gu,

Seoul 137-130, Korea

+82-2-6912-6589 [email protected] Lee LG Electronics [email protected] Park LG Electronics [email protected] Kim LG Electronics [email protected] Ryu LG Electronics [email protected] Cho LG Electronics [email protected]

January 2015

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

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


Box1SINR Calibration with long

term path loss

Box 4PHY System Calibration

(Devices transmit based on CCA)

Box 2SINR Calibration with Multipath and MIMO

Box 3MAC System Calibration

(MAC Features)

Box 5Integrated PHY/MAC

Calibration

Box 0PHY Abstraction

Calibration

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

Box-5 PHY Details [2]


PHY parametersBW 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 1/1

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

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

Box-5 MAC Details [2]


MAC parametersAccess 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 simulation1 drop = 5 seconds (+ 1 second for initial running)

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

11ac Scenario 6 – OBSS Enterprise [2][3]


-50 -40 -30 -20 -10 0 10 20 30 40 50-30

-20

-10

0

10

20

30

1

4

7

10

13 16

19 22 25 28

2 5

8 11

14

17

20

23 26

29

3 9

15 21

27

6 12

18 24 30

BSS A STA locationsBSS B STA locations assuming (xb,yb)=(40,20)BSS C STA locations assuming (xb,yb)=(-40,-20)

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

doc.: IEEE 802.11-14/1392r3

Submission

Traffic Flow Model [2][3]• DL/UL traffic assigned for each STA


STA DL UL STA DL ULSTA1 y y STA23 n ySTA2 y y STA25 y ySTA4 y y STA26 y ySTA5 y y STA28 y ySTA7 y y STA29 y ySTA8 y y STA3 y y

STA10 y n STA9 y nSTA11 y n STA15 y nSTA13 y n STA21 n ySTA14 y n STA27 y ySTA16 y n STA6 y ySTA17 y n STA12 y nSTA19 y n STA18 y nSTA20 y n STA24 n ySTA22 n y STA30 y y

January 2015

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


January 2015

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.


January 2015

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


Total TputUL: 206.66 MbpsDL: 254.93 Mbps

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

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 (+0.47) 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)

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


Total Tput: 207.48 MbpsUL: 31.17 MbpsDL: 176.31 Mbps

January 2015

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% ↓)


January 2015

note: 5/6=0.83, 1/6=0.17

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


January 2015

# of Interferer frames transmitted by STAi

# of total frames transmitted by STAi

# of Interfered frames transmitted by STAi

# of total frames transmitted by STAi

pd, i =

pr, i =

# of success subframes transmitted by STAi

# of total subframes transmitted by STAi

psucc, i =

x 100

x 100

x 100

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


January 2015

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 %

doc.: IEEE 802.11-14/1392r3

Submission

Three BSSs Test• UL only


BSS ATotal Tput:83.84 Mbps

BSS BTotal Tput:112.87 Mbps

BSS CTotal Tput:148.61 Mbps

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

Three BSSs Test• DL only


BSS ATotal Tput:15.87 Mbps

BSS BTotal Tput:178.01 Mbps

BSS CTotal Tput:172.28 Mbps

January 2015

doc.: IEEE 802.11-14/1392r3

Submission

Three BSSs Test Result• Comparison with old version result


January 2015

UL only DL only





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% ↑)

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


January 2015

# of total frames transmitted by APi

# of subframes transmitted by APi

# of frames transmitted by APi

Nt, i =

AVERf, i =

# of success subframes transmitted by APi

# of total subframes transmitted by APi

psucc, i = x 100

total simulation time (500 sec)

total idle time sensed by APiIt, i =

total simulation time (500 sec)x 100

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


January 2015

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 %

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


January 2015

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


January 2015

Doc.: IEEE 802.11-14/1392r3 SubmissionSuhwook Kim, LG ElectronicsSlide 1 Simulation results for Box 5 calibration Date: 2015-01-12 Authors: NameAffiliationsAddressPhoneEmail.

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