doc.: ieee 802.11-15/0072r1 submission discussion on mac calibration power saving test date:...
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doc.: IEEE 802.11-15/0072r1
Submission
Discussion on MAC Calibration Power Saving Test
Date: 2015-01-12
March 2015
Yanchun Li (Huawei Technologies)Slide 1
Name Company Address Phone email Yanchun Li Huawei Technology Bantian Longgang
Shenzhen 518129 P.R. China
+86-15337257958
Yunbo Li Huawei Technology Bantian Longgang Shenzhen 518129 P.R. China
+86-18666203037
Zhou Lan Huawei Technology Bantian Longgang Shenzhen 518129 P.R. China
+86-18565826350
Authors:
doc.: IEEE 802.11-15/0072r1
Submission
Recap: Test 5 U-APSD
• U-APSD which is suitable for bi-directional transmission has been selected by test 5 (Power Saving MAC Calibration) [1]
– The scenario is revised in 2015 Jan meeting.
March 2015
Yanchun Li (Huawei Technologies)Slide 2
MPDU
ACK
SIFS
MPDU
ACK
SIFSAIFSAIFS
Backoff
BackoffProbeDelay
Transmit (TX) Listen (LI)
Receive (RX) Sleep
LI TX TX SleepSleep LI RX RXLI LI
Power State
AP
STA
STA Power State
DLDATA
ULDATA
UL DATA is created and set immediately
to transmission
AP buffers the DL frame since the STA is in Power Save mode
doc.: IEEE 802.11-15/0072r1
Submission
Theoretical Calculation of time in each state- STA Tx/Rx Time
• Theoretical Calculation of time in each state- STA Tx/Rx Time
• STA– Tx Time = 304us /40ms=0.76%
• 1 Data MSDU (236us) in each 40ms
• ACK= 68us
– Rx Time = Tx Time=0.76%
March 2015
Slide 3 Yanchun Li (Huawei Technologies)
Operation ValueMSDU Data 120 bytesMAC PDU + MAC Header 30 bytes 150 bytesPHY SDU(A-MPDU: 1 MPDU per PHY SDU)
Ceiling((16 bit (Service Field)+ 4*8bit(Delimiter) + 150*8bit (MPDU)+ 2bit (Padding)+6bit (CC))/6.5e6,4e-6)
196 us
PHY PDU + 11ac PHY Header 40 us 236 us
doc.: IEEE 802.11-15/0072r1
Submission
Theoretical Calculation of time in each state- STA Tx/Rx Time
• STA’s listen time per 40ms (217.5us/40ms=0.54375%)– 100us (ProbeDelay)+( 34us(AIFS)+9us*15/2 (Backoff)+16us(SIFS) )*2 =335us
March 2015
Slide 4 Yanchun Li (Huawei Technologies)
ProbeDelay 100 us
335 us(Listen Time per 40ms)
Channel Deferral
AIFS 34 us
117.5us in Total
x2 =235 us
Random Backoff
9*15/2 us
SIFS 16 us
MPDU
ACK
SIFS
MPDU
ACK
SIFSAIFSAIFS
Backoff
BackoffProbeDelay
Transmit (TX) Listen (LI)
Receive (RX) Sleep
LI TX TX SleepSleep LI RX RXLI LI
Power State
AP
STA
STA Power State
DLDATA
ULDATA
UL DATA is created and set immediately
to transmission
AP buffers the DL frame since the STA is in Power Save mode
doc.: IEEE 802.11-15/0072r1
Submission
Theoretical Calculation of time in each state- STA Sleep Time
• STA Sleep Time– 40ms (period)-304us (Tx Time)-304us(Rx Time)-335us(Listen
Time) = 39057us
– 39057us /40ms=97.64%
March 2015
Slide 5 Yanchun Li (Huawei Technologies)
doc.: IEEE 802.11-15/0072r1
Submission
Simulation results
• Simulation results matches the theoretical analysis– MAC throughput: 29.6 kbps in both DL/UL, PER = 0%
• Breakdown of percentage of time
March 2015
Yanchun Li (Huawei Technologies)
*AP listens to the channel all the time (except TX and RX)
STA (%) AP (%)time precentatge Listen RX TX Sleep Listen RX TX Sleep
< Power Save
Mechanism > On
Theoretical 0.84% 0.76% 0.76% 97.64% 98.48% 0.76% 0.76% 0.00%
Simulation 0.84% 0.76% 0.76% 97.64% 98.48% 0.76% 0.76% 0.00%< Power
Save Mechanism
> Off
Theoretical 98.48% 0.76% 0.76% 0.00% 98.48% 0.76% 0.76% 0.00%
Simulation 98.48% 0.76% 0.76% 0.00% 98.48% 0.76% 0.76% 0.00%
doc.: IEEE 802.11-15/0072r1
Submission
Breakdown of Power Consumption
• Power consumption
=0.0635
- Energy Efficiency Ratio:
March 2015
Yanchun Li (Huawei Technologies)
STA (%) AP (%)Power Precentage Listen RX TX Sleep Listen RX TX Sleep
< Power Save
Mechanism > On
Theoretical 12.65% 22.96% 64.30% 0.09% 94.46% 1.46% 4.08% 0.00%
Simulation 12.65% 22.96% 64.30% 0.09% 94.46% 1.46% 4.08% 0.00%< Power
Save Mechanism
> Off
Theoretical 94.46% 1.46% 4.08% 0.00% 94.46% 1.46% 4.08% 0.00%
Simulation 94.46% 1.46% 4.08% 0.00% 94.46% 1.46% 4.08% 0.00%
doc.: IEEE 802.11-15/0072r1
Submission
Conclusions
• Our MAC calibration test 5 U-APSD’s simulation results match with the theoretical analysis.
• The energy efficiency ratio of U-APSD for delivering 120byte MSDU per 40ms in both UL and DL in ideal case is 0.0635.
March 2015
Yanchun Li (Huawei Technologies)
doc.: IEEE 802.11-15/0072r1
Submission
Reference
• [1] 11-14-0980-06-00ax-simulation-scenarios.docx (2015 Jan)
March 2015
Yanchun Li (Huawei Technologies)
doc.: IEEE 802.11-15/0072r1
Submission
Recap: Power save test parameters in [1]
• Power save test parameters– AIFS=DIFS=34us
– RTS/CTS [ OFF ]
– MCS = [ 0 ]
– Beacon is not transmitted in U-APSD test
– Max SP Length = [ 4 ]
– ProbeDelay = 100µs
• Output: – MAC throughput
– Percentage of time spent in each power state during the course of the simulation
– Percentgae of energy consumed in each power state during the course of the simulation
Slide 10
March 2015
Yanchun Li (Huawei Technologies)