1. Box 5 Calibration Results
November 2015
doc.: IEEE /0629r0
May 2016
Box 5 Calibration Results
Date:
Authors:
Name
Affiliation
Address
Phone
Marik Hsiao
Mediatek
2840 Junction Ave
San Jose, CA 95131, USA
Andrew Tsai
Wilson Tsao
Jack Lee
Chung-Ta Ku
Paul Cheng
Russell Huang
Marik Hsiao, MediaTek Inc.
Narendar Madhavan, Toshiba

2. Introduction Calibration effort in IEEE 802 TGax is guided by [2].
May 2016
Introduction
Calibration effort in IEEE 802 TGax is guided by [2].
Box 5 calibration is now following the decisions in [1], [3], [4].
A few companies have provided calibration results, in [5], [6].
In this presentation, the following simulation results of Box 5 calibration from a different simulation system, OMNet++, are presented.
1 BSS
DL: 1 case
UL: 9 cases
2 BSS
UL: 1 case
Mix DL&UL: 2 cases
3 BSS
Mix DL&UL: 1 cases
Marik Hsiao, MediaTek Inc.

3. Box 5 Calibration Configuration – PHY [1]
May 2016
Box 5 Calibration Configuration – PHY [1]
PHY parameters BW
All BSSs at 5GHz [80 MHz, no dynamic bandwidth]
Primary channel
Aligned primary 20MHz channel for each co-80MHz-channel BSS; The detection of preamble and BA should only focus on primary 20MHz
Channel model
TGac D NLOS per link
Shadow fading
iid log-normal shadowing (0 dB standard deviation) per link
Preamble type
Control: legacy 20us; Data: 11ac (20us+20us for 1antenna case)
Legacy control frame rate
Basic 6Mbps rate for RTS/CTS/ACK/BA (MCS0) [1]
AP/STA TX Power
20/15 dBm per antenna 
Power Spectral density
Scaled to 80 MHz
number of antennas at AP /STA
1/1
AP /STA antenna gain
0/-2 dBi
Noise Figure
7dB
CCA-ED threshold
-56 dBm (measured across the entire bandwidth after large-scale fading)
Rx sensitivity/CCA-SD
-76 dBm (a packet with lower rx power is dropped)
Link Adaption
Fixed MCS =5 for 11ac SS6 and TBD for 11ax SS1-4
Channel estimation
Ideal unless otherwise specified
PHY abstraction
RBIR, BCC (see appendix 1&3 in [2])
Symbol length
4us with 800ns GI per OFDM symbol
Marik Hsiao, MediaTek Inc.

4. Box 5 Calibration Configuration – MAC [1]
May 2016
Box 5 Calibration Configuration – MAC [1]
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
Random start time during a 10ms interval
MPDU size
1544 Bytes (1472 Data + 28 IP header + 8 LLC header + 30 MAC header + 4 delimiter + 2 padding)
Aggregation
[A-MPDU / max aggregation size / BA window size, No A-MSDU, immediate BA without explicit request], Max aggregation: 32 MPDUs
Max number of retries 10
Beacon
Disabled unless otherwise specified
RTS/CTS
OFF unless otherwise specified
Running time
>= 10s per drop
Output metric
-CDF or Histogram of per non-AP STA throughput (received bits/overall simulation time)
-PER of all AP/STA (1 - # of success subframes / # of transmitted subframes)
Marik Hsiao, MediaTek Inc.

5. Fixed Location and Association
May 2016
Box 5 Calibration
Topology [1]
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)
Marik Hsiao, MediaTek Inc.

6. 1 BSS (B) 3 STAs (STA3, 9, 15) UL Analysis
May 2016
1 BSS (B) 3 STAs (STA3, 9, 15) UL Analysis x y
distance to AP
pathloss
rcvdPower AP 40 20
STA3
7.5+40
12.10
STA9
7+40
10.26
STA15
3+40
3.04
collide
rcvdPwr
InterferencePwr
dbm mw
SINR
Success
PER
STA3_9
ST9
-58.09
ST3
-60.60
8.71E-07
2.51 1
STA3_15
ST15
-42.84
17.76
98.55%
1.45%
STA9_15
1.55E-06
15.24
8.31%
91.69%
STA3_9_15
13.1 0%
100%
Marik Hsiao, MediaTek Inc.

7. MCS 5 PER in Channel Model D NLOS
May 2016
MCS 5 PER in Channel Model D NLOS
Marik Hsiao, MediaTek Inc.

8. May 2016
1 BSS (B) 3 STAs Results
Marik Hsiao, MediaTek Inc.

9. 1 BSS (B) 3 STAs (STA3, 9, 27) UL Analysis
May 2016
1 BSS (B) 3 STAs (STA3, 9, 27) UL Analysis x y
distance to AP B
pathloss
rcvdPower(STA->B)
AP B 40 20
STA3
47.5
10.5
STA9 47
12.5
STA27 34
22.5
6.5
The SINR in AP B should be lower than 10 when any collisions occurs
AP B cannot successfully decode any data if the collisions occur.
STA3, 9, and 27 should have the similar throughputs.
Marik Hsiao, MediaTek Inc.

10. May 2016
1 BSS (B) 3 STAs Results
Marik Hsiao, MediaTek Inc.

11. May 2016
2 BSS DL Analysis x y
distance to AP B
pathloss
rcvdPower(A->B)
AP A
The interference powers received by AP A and AP B are both higher then sensitivity.
BSS A and BSS B should have the similar total throughputs
The interference from AP A or AP B to STAs in BSS B or BSS A is small, respectively
All STAs can successfully decode their packets
Conclusions
All STAs’ throughputs in the same BSS should be similar.
Marik Hsiao, MediaTek Inc.

12. May 2016
2 BSS (A+B) Results
Marik Hsiao, MediaTek Inc.

13. rcvdPower(STA->A)
May 2016
2 BSS, A DL B UL, Analysis x y
distance to AP A
pathloss
rcvdPower(STA->A)
AP A
STA3
47.50
10.50
48.65
STA21
33.50
17.00
37.57
STA27
34.00
22.50
40.77
The interference powers from STA3, 21, and 27 to AP A are all lower than sensitivity.
AP A will send out its DL data without suspending BO counters.
The interference powers from STA 3, 21, and 27 to STAs in BSS A are small except STA26
Only when STA26 is receiving its DL data and STA21 and/or STA27 send UL data simultaneously, the SINR will decrease to around 17.5
The probability is small
SINR 17.5 still has around 98.5% successful rate.
Marik Hsiao, MediaTek Inc.

14. May 2016
2 BSS (A+B) Results
Marik Hsiao, MediaTek Inc.

15. May 2016
2 BSS, A UL B DL, Analysis
All the interference powers from BSS A STAs to AP B are lower than sensitivity.
All the interference powers from BSS A STAs to BSS B STAs are small as well.
AP B will continue send DL data without suspending BO counters.
The interference powers from AP B to STA2, 5, 23, 25, 26, and 29 are higher than sensitivity. The throughputs of other STAs will depend on SINR and PER.
Marik Hsiao, MediaTek Inc.

16. May 2016
2 BSS (A+B) Results
Marik Hsiao, MediaTek Inc.

17. May 2016
2 BSS (A+B) Results
Marik Hsiao, MediaTek Inc.

18. May 2016
3 BSS Results
Marik Hsiao, MediaTek Inc.

19. May 2016
3 BSS Results
Marik Hsiao, MediaTek Inc.

20. May 2016
3 BSS Results
Marik Hsiao, MediaTek Inc.

21. May 2016
3 BSS Results
Marik Hsiao, MediaTek Inc.

22. May 2016
Conclusion
Results from 1 BSS test cases align with prior efforts from other companies
Results from 2 BSS DL test case align with prior efforts from other companies
Lack of alignment in other 2BSS test cases and all 3BSS test cases due to sparseness of test results submitted and divergence among submitted results
Since prior efforts suggest DL test results are easier to align, we are waiting for more results for the 3BSS DL test case as the next step to analyze and come up with convergent results

23. Reference
[1] 11-15/0680r3 Reference Box5 Calibration Assumptions and Parameters
[2] 11-15/0980r10 TGax Simulation Scenarios
[3] 11-14/1523r5 Offline Discussion Minutes of SLS Calibration
[4] 11-15/0681r1 TG ax Scenarios: Proposed Text additions to 14/980 for Box5 Calibration
[5] 11-15/0802r1 Calibration Results of SS6
[6] 11-15/0885r0 Box 5 calibration result

24. May 2016
May 2016
Appendix
Marik Hsiao, MediaTek Inc.

25. May 2016
1 BSS (B) DL Results
Marik Hsiao, MediaTek Inc.

26. May 2016
1 BSS (B) 1 STA Results
Marik Hsiao, MediaTek Inc.

27. May 2016
1 BSS (B) 1 STA Results
Marik Hsiao, MediaTek Inc.

28. May 2016
1 BSS (B) 1 STA Results
Marik Hsiao, MediaTek Inc.

29. May 2016
1 BSS (B) 1 STA Results
Marik Hsiao, MediaTek Inc.

30. May 2016
1 BSS (B) 1 STA Results
Marik Hsiao, MediaTek Inc.

31. May 2016
1 BSS (B) 2 STAs Results
Marik Hsiao, MediaTek Inc.

32. May 2016
1 BSS (B) 2 STAs Results
Marik Hsiao, MediaTek Inc.

33. May 2016
1 BSS (B) 2 STAs Results
Marik Hsiao, MediaTek Inc.