Date post: | 18-Jan-2018 |
Category: |
Documents |
Upload: | everett-neal |
View: | 216 times |
Download: | 0 times |
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
Suhwook Kim, LG ElectronicsSlide 3
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]
Suhwook Kim, LG ElectronicsSlide 4
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]
Suhwook Kim, LG ElectronicsSlide 5
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]
Suhwook Kim, LG ElectronicsSlide 6
-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
Suhwook Kim, LG ElectronicsSlide 7
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
Suhwook Kim, LG ElectronicsSlide 8
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.
Suhwook Kim, LG ElectronicsSlide 9
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
Suhwook Kim, LG ElectronicsSlide 10
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
Suhwook Kim, LG ElectronicsSlide 11
January 2015
DL only UL only
Old version simulator
New version simulator
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
Suhwook Kim, LG ElectronicsSlide 12
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% ↓)
Suhwook Kim, LG ElectronicsSlide 13
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
Suhwook Kim, LG ElectronicsSlide 14
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
Suhwook Kim, LG ElectronicsSlide 15
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
Suhwook Kim, LG ElectronicsSlide 16
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
Suhwook Kim, LG ElectronicsSlide 17
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
Suhwook Kim, LG ElectronicsSlide 18
January 2015
UL only DL only
Old version simulator
New version simulator
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% ↑)
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 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
Suhwook Kim, LG ElectronicsSlide 20
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
Suhwook Kim, LG ElectronicsSlide 21
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
Suhwook Kim, LG ElectronicsSlide 22
January 2015