1. Power Save Simulation Results
September 2015
Power Save Simulation Results
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. September 2015
Abstract
We have been doing power save calibrations based on the power save calibration scenario assumed only for power save calibration.
To evaluate more realistic power save gain, this contribution provides initial simulation results of power save mode based not on power save calibration scenario but on modified residential scenario (SS1).
The results show that the power save efficiency of PSP operation is maintained in the modified SS1.
Hyeyoung Choi, LG Electronics

3. Test cases in simulation
September 2015
Test cases in simulation
1floor Residential scenario
Apartment size:10m x 10m x 3m
Case1: Single BSS (1 apartment)
1 AP(on center of apartment), 1~10 STA(random location)
Case2: OBSS (2x10 apartments)
20 AP(on center of apartment), 5 STAs(random location)
Case 2-1: Fixed 3 channel reuse
Case 2-2: Randomly 3 channel reuse
Traffic model
The MSDU 1500 bytes DL traffic was transmitted every 200ms for each STA.
The first data arrival time of STA has uniform distribution for 600ms.
Simulation
The number of Drop: Case 1-100/Case 2-10
Simulation time of each Drop: 30s
Hyeyoung Choi, LG Electronics

4. Parameters in simulation
September 2015
Parameters in simulation
PHY parameters BW
20MHz
Channel model
TGac D NLOS per link
Shadow fading
iid log-normal shadowing
(5 dB standard deviation) per link
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
AP antenna gain
0 dBi
STA antenna gain
-2 dBi
Noise Figure
7dB
MAC parameters
AIFS=DIFS
34us
No A-MPDU aggregation
RTS/CTS
OFF
Beacon size(Byte) 80
DTIM 3
Beacon Interval
100 TU
Hyeyoung Choi,, LG Electronics

5. September 2015
PSP operation
Hyeyoung Choi,, LG Electronics

6. The result of Test Case 1 (Single BSS)
September 2015
The result of Test Case 1 (Single BSS)
STA(%)
AP(%)
PS ON/OFF
DTIM
Listen RX TX
Sleep
1 AP,
1 STA
Active -
PSP 3
5 STA
94.794
10 STA
Calibration result[2]
1 AP, 1 STA
99.01
0.97
0.02
98.95
0.07
1.04
0.08
98.81
98.69
1.14
The larger the number of PS STAs is, the shorter PS STA sleeps.
Since more PS STA contends channel to transmit PS-POLL
1 AP/1 STA results are almost same with calibration result except TX part
When beacon reception is failed, STA doesn’t send PS-POLL
Hyeyoung Choi,, LG Electronics

7. The result of Test Case 2 (OBSS)
September 2015
The result of Test Case 2 (OBSS)
Case 2-1: Fixed 3 channel reuse
Case 2-2: 3 channel reuse randomly
In the case of 3 channel reuse random, PS STA sleeps shorter than PS STA in the case of fixed 3 channel reuse.
STA(%)
AP(%)
PS ON/OFF
DTIM
Listen RX TX
Sleep
Active -
94.794
PSP 3
STA(%)
AP(%)
PS ON/OFF
DTIM
Listen RX TX
Sleep
Active -
PSP 3
Hyeyoung Choi,, LG Electronics

8. September 2015
Conclusion
This submission provides initial simulation results of power save mode.
The power save efficiency of PSP operation is maintained in the modified SS1: Sleep time of PS STA is 96~99% in simulation results.
In next step, we will consider the case when there are PS STAs and active STAs together.
Hyeyoung Choi,, LG Electronics

9. Reference [1] 11-14-0980-14-00ax-simulation-scenarios.docx
September 2015
Reference
[1] ax-simulation-scenarios.docx
[2] ax-power-save-calibration.pptx
Hyeyoung Choi,, LG Electronics