1. MAC Calibration results
September 2014
MAC Calibration results
Date:
Authors:
Name
Affiliations
Address
Phone
Suhwook Kim
LG Electronics
19, Yangjea-daero 11gil, Seocho-gu, Seoul , Korea
Giwon Park
Jeongki Kim
Kiseon Ryu
HanGyu Cho
Suhwook Kim, LG Electronics

2. September 2014
Abstract
In this submission, we will provide MAC calibration results for test 1, 2, and 3
We will propose additional test cases for MU transmission
Suhwook Kim, LG Electronics

3. Test 1a – Parameters setting
September 2014
Test 1a – Parameters setting
MAC overhead w/o RTS/CTS
MSDU length: 500, 1000, 1500, 2000 Bytes
2 MPDU limit
RTS/CTS on
Data MSC: 0 (6.5 Mbps), 8 (78 Mbps)
ACK MSC: fixed to legacy MCS 0 (6 Mbps)
CWmin = 15
AIFS = DIFS = 34 us
STA 1
AP1
Suhwook Kim, LG Electronics

4. Test 1a – Results Check point (1500 Byte, MCS 0) September 2014
Test Items
Check points
Standard definition
Matching?
A-MPDU duration
Tcp2-Tcp1= 3828 us
ceil((FrameLength*8)/rate/OFDMsymbolduration) * OFDMsymbolduration + PHY Header OK
SIFS
Tcp3-Tcp2=16 us
16 us
ACK duration
Tcp4-Tcp3= 68 us
ceil((ACKFrameLength*8)/rate/OFDMsymbolduration) * OFDMsymbolduration + PHY Header
Defer & backoff duration
Tcp5-Tcp4= 169us
DIFS(34 us)+backoff (CWmin)
=34us+15*9us
Suhwook Kim, LG Electronics

5. Test 1a – Results Calculation of Tput and simulation result
September 2014
Test 1a – Results
Calculation of Tput and simulation result
MCS 0 (6.5 Mbps)
MCS 8 (78 Mbps)
MSDU size
[Byte]
500
1000
1500
2000
Expected Tput [Mbps]
4.791
5.545
5.836
5.995
21.997
34.935
43.258
48.682
Throughput [Mbps]
4.79
5.55
5.84
6.00
22.0
34.9
43.3
48.7
Gap
[%]
0.0255
0.1015
Suhwook Kim, LG Electronics

6. Test 1b – Parameters setting
September 2014
Test 1b – Parameters setting
MAC overhead w/ RTS/CTS
MSDU length: 500, 1000, 1500, 2000 Bytes
2 MPDU limit
RTS/CTS on
Data MSC: 0 (6.5 Mbps), 8 (78 Mbps)
RTS, CTS, ACK MSC: fixed to legacy MCS 0 (6 Mbps)
CWmin = 15
AIFS = DIFS = 34 us
STA 1
AP1
Suhwook Kim, LG Electronics

7. Test 1b – Results Check point September 2014 Test Items Check points
Standard definition
Matching?
RTS duration
Tcp2-Tcp1= 52
ceil((RTSFrameLength*8)/rate/OFDMsymbolduration) * OFDMsymbolduration + PHY Header OK
CTS duration
Tcp4-Tcp3= 44
ceil((CTSFrameLength*8)/rate/OFDMsymbolduration) * OFDMsymbolduration + PHY Header
Frame duration
Tcp6-Tcp5= 3828
ceil((FrameLength*8)/rate/OFDMsymbolduration) * OFDMsymbolduration + PHY Header
Suhwook Kim, LG Electronics

8. Test 1b – Results Calculation of Tput and simulation result
September 2014
Test 1b – Results
Calculation of Tput and simulation result
MCS 0 (6.5 Mbps)
MCS 8 (78 Mbps)
MSDU size
[Byte]
500
1000
1500
2000
Expected Tput [Mbps]
4.426
5.301
5.656
5.852
15.948
27.083
34.987
40.626
Throughput [Mbps]
4.43
5.30
5.66
5.85
16.0
27.1
35.0
40.6
Gap
[%]
0.0237
0.0395
0.0633
Suhwook Kim, LG Electronics

9. Test 2a – Parameters setting
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Test 2a – Parameters setting
Deferral Test 1
MSDU length: 500, 1000, 1500, 2000 Bytes
2 MPDU limit
RTS/CTS on or off
Data MSC: 0 (6.5 Mbps)
ACK MSC: fixed to legacy MCS 0 (6 Mbps)
Max number of retries = 10
CWmin = 15
CWmax = 1023
AIFS = DIFS = 34 us
STA 1
AP 2
AP1
STA 2
(AP1 and STA2 are essentially co-located)
Suhwook Kim, LG Electronics
John Doe, Some Company

10. Test 2a – Results Deferral Test 1 September 2014 Month Year
doc.: IEEE yy/xxxxr0
September 2014
Test 2a – Results
Deferral Test 1
RTS off
RTS on
MSDU size
[Byte]
500
1000
1500
2000
Throughput [Mbps]
4.60
5.28
5.54
5.68
4.48
5.34
5.88
Data PER
[%]
11.1
Suhwook Kim, LG Electronics
John Doe, Some Company

11. Test 2b, 3 – Parameters setting
September 2014
Test 2b, 3 – Parameters setting
Deferral Test and NAV deferral
MSDU length: 1500 Bytes
2 MPDU limit
RTS/CTS: test 2b(off), test 3(on)
Data MSC: 0 (6.5 Mbps), 8 (78 Mbps)
ACK MSC: fixed to legacy MCS 0 (6 Mbps)
Max number of retries = 10
CWmin = 15
CWmax = 1023
AIFS = DIFS = 34 us
STA 1
AP 2
AP1
STA 2
Suhwook Kim, LG Electronics

12. Test 2b – Collision model
September 2014
Test 2b – Collision model
Case analysis (in view of Green-colored frame)
Collision at Preamble
All subframe is fail, there isn’t ACK
Collision at Subframe1
Collision at Subframe2
Subframe1 is success, subframe2 is fail. ACK will be transmitted
Collision at SIFS/ACK
All subframe is success. ACK will be transmitted
Suhwook Kim, LG Electronics

13. Test 2b, 3 – Results Deferral Test 2 and NAV deferral September 2014
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Test 2b, 3 – Results
Deferral Test 2 and NAV deferral
RTS off
RTS on
MCS 8
Throughput [Mbps]
1.02
35.0
5.58
34.2
Data PER
[%]
88.4
29.1
Suhwook Kim, LG Electronics
John Doe, Some Company

14. Proposed test cases for MU transmission
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Proposed test cases for MU transmission
IEEE ac has already DL MU-MIMO scheme
11ax will adopt OFDMA and UL MU-MIMO probably
Therefore, we need to have test case for MU transmission
In this proposal, we firstly propose simple test cases for DL MU-MIMO transmission for MAC calibration
Suhwook Kim, LG Electronics
John Doe, Some Company

15. Proposed test case: Test 5
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Proposed test case: Test 5
DL MU-MIMO transmission
In this case, we will check operation of DL MU-MIMO data and BAR/BACK transmission
Basic parameters are specified in 14/0980r2
Topology is similar with test case 1. There are one AP and two STAs
Assumption is that PER is 0
Output metric: throughput, time trace of transmitting/receiving event
STA 2
AP1
STA 1
Suhwook Kim, LG Electronics
John Doe, Some Company

16. Test 5 DL MU-MIMO transmission Check point and frame transaction
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Test 5
DL MU-MIMO transmission
Check point and frame transaction
CP1: AP1 transmits DL MU-MIMO data frame to STA1 and STA2
CP2, CP3: STA1 will response by Block ACK after SIFS
CP4, CP5: AP will transmit BAR (Block ACK Request) to STA2 after SIFS
CP6: STA2 will response by Block ACK after SIFS
Suhwook Kim, LG Electronics
John Doe, Some Company

17. Proposed test case: Test 6
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Proposed test case: Test 6
DL MU-MIMO transmission with interference
In this case, we will check operation of DL MU-MIMO data and BAR transmission when there is interference
Basic parameters are specified in 14/0980r2
Topology is similar with test case 2b. There are two APs and three STAs
AP1 and STA3 is hidden from AP2 and vice versa.
AP1 always transmit MU-MIMO data frame to STA1 and STA3
Output metric: throughput, time trace of transmitting/receiving event
STA 1
AP 2
AP1
STA 2
STA 3
Suhwook Kim, LG Electronics
John Doe, Some Company

18. Test 6 DL MU-MIMO transmission with interference
Month Year
doc.: IEEE yy/xxxxr0
September 2014
Test 6
DL MU-MIMO transmission with interference
Check point and frame transaction
CP1: AP1 transmits DL MU-MIMO data frame to STA1 and STA3
CP2, CP3: Reception of STA1 is fail because of interference from AP2. AP1 will transmit BAR to STA3 after one slot (PIFS)
CP4: STA3 will response by Block ACK after SIFS
Suhwook Kim, LG Electronics
John Doe, Some Company

19. Conclusion In this submission, we provided MAC calibration results
September 2014
Conclusion
In this submission, we provided MAC calibration results
Our results of test 1a/b are well matched with mathematical analysis
The results of test 2 and 3 need to be calibrated with other TG members
We firstly propose simple test cases for DL MU-MIMO transmission for MAC calibration
In this case, we will check operation of DL MU-MIMO data and BAR transmission when there is or isn’t interference
Suhwook Kim, LG Electronics

20. September 2014
Straw poll
Do you agree to include the proposed test cases in the simulation calibration scenario? Y N A
Suhwook Kim, LG Electronics

21. September 2014
Appendix
Suhwook Kim, LG Electronics

22. Test 1a/b Frame duration and overhead September 2014
Suhwook Kim, LG Electronics

23. Test 1a Calculation of Tput September 2014
Total application payload (bits)
Throughput =
Time consumed for transmitting total MAC payload (sec)
Total application payload (bits) =
Exp[Backoff] + Duration of A-MPDU + SIFS + Duration of ACK
Total application payload (bits) =
( * 7.5 )+ Duration of A-MPDU
Suhwook Kim, LG Electronics

24. Test 1b Calculation of Tput September 2014
Total application payload (bits)
Throughput =
Time consumed for transmitting total MAC payload (sec)
Total application payload (bits) =
Exp[Backoff] + Duration of RTS + SIFS + Duration of CTS + SIFS +
Duration of A-MPDU + SIFS + Duration of ACK
Total application payload (bits) =
( * 7.5 ) Duration of A-MPDU
Suhwook Kim, LG Electronics