1. Power Save Calibration
March 2015
Power Save Calibration
Date:
Authors:
Name
Affiliations
Address
Phone
Hyeyoung Choi
LG Electronics
19, Yangjea-daero 11gil, Seocho-gu, Seoul , Korea
Suhwook Kim
Kiseon Ryu
Jeongki Kim
HanGyu Cho
Hyeyoung Choi, LG Electronics

2. March 2015
Abstract
This submission provides results for power save calibration simulations.
All test cases and parameters are defined in r6 Simulation Scenarios.
Hyeyoung Choi, LG Electronics

3. PSM Test The MSDU 1500 bytes DL traffic was transmitted every 200ms
March 2015
PSM Test
The MSDU 1500 bytes DL traffic was transmitted every 200ms
PPDU length=2012us
PSM Timer operation in current SSD
When STA on PSM receives the Data and STA transmits the ACK successfully, STA starts the PSM Timer.
Parameters
RTS/CTS
OFF
AIFS=
DIFS
34us
MCS
No A-MPDU aggregation
Simulation time
300s
Beacon size(Byte)
272
Hyeyoung Choi, LG Electronics

4. Issues of Test 5 in current SSD
Month Year
doc.: IEEE yy/xxxxr0
March 2015
Issues of Test 5 in current SSD
Test 5 in Current SSD is imprecise for power save calibration.
In PSM Test, when STA on PSM receives a frame, STA may reset the PSM Timer.
i.e., Data frame, DTIM Beacon frame
In PSM/PSP Test
When PS STA detects that the bit corresponding to its AID is 0 in DTIM Beacon frame
whether PS STA enters the sleep state and PS STA remains the sleep state until PS STA enters the Awake state to receive the DTIM Beacon frame or not .
Since the AP transmits Beacon frame in the PSM/PSP Test, the time spent in RX State of STA and TX State of AP depends on Beacon size.
Hyeyoung Choi, LG Electronics
John Doe, Some Company

5. Simulation results for PSM Test- Time(1/2)
March 2015
Simulation results for PSM Test- Time(1/2)
The shorter PSM Timeout is, the longer STA sleeps.
If PSM Timeout is larger than DTIM Interval, the max time that STA maintains listen state is DTIM Interval.
The Max value of significant PSM Timeout=DTIM interval
STA(%)
AP(%)
Power save
ON/OFF
DTIM
PSM Timeout
Listen RX TX
Sleep
Active -
98.98
0.99
0.03
98.92
PSM 1 50
25.15
1.41
0.09
73.36
98.41 3
16.78
1.14
0.07
82.01
98.44
1.39
100
48.72
1.38
0.06
49.84
98.46
32.67
1.13
0.05
66.15
98.48
200
48.89
1.12
0.04
49.95
98.50
1.37 LG
STA(%)
AP(%)
Power save
ON/OFF
DTIM
PSM Timeout
Listen RX TX
Sleep
Active -
98.60
1.37
0.03
0.00
PSM 1 50
20.99
1.21
0.07
77.73
98.53
1.40 3
20.98
1.12
77.83
100
33.40
1.30
65.23
33.39
65.33
200
Nokia[2]
Hyeyoung Choi, LG Electronics

6. Simulation results for PSM Test- Time(2/2)
March 2015
Simulation results for PSM Test- Time(2/2)
Compared with [2]
In Active Mode
[3] (Nokia) suggest 80 octet for Beacon size
We assume that the Size of Beacon is 272 octet(including TIM:250 octet)
In PSM Mode, PSM Timeout=[200]ms
We assume that PSM STA enters the sleep state during DTIM Interval when PSM STA detects that the bit corresponding to its AID is 0 in DTIM Beacon frame.
Example of the frameflow in PSM scenario (DTIM=[3]/PSM Timeout=[200]ms)
Slide 6
Hyeyoung Choi,, LG Electronics

7. Simulation results for PSM Test- Energy
Month Year
doc.: IEEE yy/xxxxr0
March 2015
Simulation results for PSM Test- Energy
STA(%)
AP(%)
Power save
ON/OFF
DTIM
PSM Timeout
Listen RX TX
Sleep
Active -
97.86
1.95
0.19
94.65
0.07
5.28
PSM 1 50
88.41
9.89
1.69
0.02
92.44
0.16
7.40 3
86.27
11.73
1.98
0.03
92.55
0.13
7.32
100
94.00
5.34
0.65
0.01
92.60
0.11
7.29
92.78
6.40
0.82
92.65
0.10
7.25
200
11.63
23.26
65.12
0.00
92.70
0.08
7.22
Hyeyoung Choi, LG Electronics
John Doe, Some Company

8. Simulation results for PSM Test-EER
March 2015
Simulation results for PSM Test-EER
DTIM=[3], PSM Timeout=[100]ms
STA AP
PSM ON
Energy
Listen RX TX
Sleep
Simulation time(%)
32.67
1.13
0.05
66.15
98.48
1.38
current(mA) 50
100
280
0.003
Power(Watt)
E-05
E-07
E-06
Power (%)
92.78
6.40
0.82
0.01
92.65
0.10
7.25
Sum Power(Watt)
OFF
98.98
0.99
0.03
98.92
1.05E-05
3.74E-06
97.86
1.95
0.19
94.65
0.07
5.28
Energy Efficiency Ratio
Hyeyoung Choi,, LG Electronics

9. PSP Test The MSDU 1500 bytes DL traffic was transmitted every 200ms
March 2015
PSP Test
The MSDU 1500 bytes DL traffic was transmitted every 200ms
PPDU length=2012us
Parameters
RTS/CTS
OFF
AIFS=
DIFS
34us
MCS
No A-MPDU aggregation
Simulation time
300s
Beacon size(Byte)
272
Hyeyoung Choi, LG Electronics

10. Simulation results for PSP Test-Time
March 2015
Simulation results for PSP Test-Time
STA sleeps longer than PSM Test since STA enters sleep state immediately without waiting when STA detects that the bit of MoreData is 0 in Data frame received.
STA(%)
AP(%)
Power save
ON/OFF
DTIM
Listen RX TX
Sleep
Active -
98.98
0.99
0.03
98.92
PSP 1
0.00
1.38
0.06
98.47
98.46 3
0.07
1.13
98.73
Hyeyoung Choi, LG Electronics

11. Simulation results for PSP Test- Energy
March 2015
Simulation results for PSP Test- Energy
STA(%)
AP(%)
Power save
ON/OFF
DTIM
Listen RX TX
Sleep
Active -
97.86
1.95
0.19
94.65
0.07
5.28
PSP 1
0.03
88.98
10.80
92.60
0.11
7.29 3
2.73
84.52
12.53
0.22
Hyeyoung Choi, LG Electronics

12. Simulation results for PSP Test-EER
March 2015
Simulation results for PSP Test-EER
DTIM=[3]
The PSP mechanism is more Energy efficient than the PSM.
STA AP
PSP ON
Energy
Listen RX TX
Sleep
Simulation time(%)
0.07
1.13
0.06
98.73
98.46
1.38
current(mA) 50
100
280
0.003
Power(Watt)
E-06
1.85E-05
3.2582E-07
6.6E-06
Power (%)
2.73
84.52
12.53
0.22
92.60
0.11
7.29
Sum Power(Watt)
OFF
98.98
0.99
0.03
98.92
1.05E-05
3.74E-06
97.86
1.95
0.19
94.65
5.28
Energy Efficiency Ratio
cf. EER of PSM =0.3481
Hyeyoung Choi, LG Electronics

13. Month Year
doc.: IEEE yy/xxxxr0
March 2015
Suggested Next Step
In Next Step, we clarify parameters and operation considered in simulation for aligning power saving test results.
The length of frames
i.e., Beacon frame, QoS Null frame, PS-Poll frame, Data, ACK
The event trigger time
Following event sequence is assumed:
The first DL DATA arrives at 100us
First DTIM Beacon is sent at 100ms
The details of operation in PSP/PSM Test
Hyeyoung Choi,, LG Electronics
John Doe, Some Company

14. March 2015
Conclusion
In this submission, we provide simulation results for power save calibration.
Some text changes in simulation scenario are needed.
Hyeyoung Choi, LG Electronics

15. Proposed text change in SSD[1]
March 2015
Proposed text change in SSD[1]
In current SSD, insert text as:
In PSM Test/PSP Test
When PS STA detects that the bit corresponding to its AID is 0 in DTIM Beacon frame, STA enters the sleep state and STA remains the sleep state until STA enters the Awake state to receive the next DTIM Beacon frame.
MAC overhead of Beacon frame is 272 octet(including TIM:250 octet)
Following event sequence is assumed:
The first DL DATA arrives at 100us
First DTIM Beacon is sent at 100ms
Hyeyoung Choi,, LG Electronics

16. Reference [1] 11-14-0980-06-00ax-simulation-scenarios.docx
March 2015
Reference
[1] ax-simulation-scenarios.docx
[2] 11-15/ ax-Power Save Calibration
[3] ax-power-save-calibration-results.pptx
[4] 11-15/ ax-U-APSD power saving calibration results
Suhwook Kim, LG Electronics

17. March 2015
Straw poll #1
Do you agree to add the following text change in document 11-15/0395r1 into the TG Simulation Scenarios document (11-14/0980r6)
MAC overhead of Beacon frame=272 byte Y: N: A:
Hyeyoung Choi,, LG Electronics

18. March 2015
Straw poll #2
Do you agree to add the following text change in document 11-15/0395r1 into the TG Simulation Scenarios document (11-14/0980r6)
Following event sequence is assumed:
The first DL DATA arrives at 100us
The first DTIM Beacon is sent at 100ms Y: N: A:
Hyeyoung Choi,, LG Electronics

19. March 2015
Straw poll #3
Do you agree to add the following text change in document 11-15/0395r1 into the TG Simulation Scenarios document (11-14/0980r6)
When PS STA detects that the bit corresponding to its AID is 0 in DTIM Beacon frame, STA enters the sleep state and STA remains the sleep state until STA enters the Awake state to receive the next DTIM Beacon frame. Y: N: A:
Hyeyoung Choi,, LG Electronics