# Discussion on MAC Calibration Power Saving Test

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Discussion on MAC Calibration Power Saving Test
July 2014 doc.: IEEE /xxxxr0 March 2015 Discussion on MAC Calibration Power Saving Test Date: Authors: Yanchun Li (Huawei Technologies) Osama Aboul-Magd (Huawei Technologies)

March 2015 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. Yanchun Li (Huawei Technologies)

Theoretical Calculation of time in each state - STA Tx/Rx Time
March 2015 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% Operation Value MSDU Data 120 bytes MAC PDU + MAC Header 30 bytes 150 bytes PHY 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 Yanchun Li (Huawei Technologies)

Theoretical Calculation of time in each state - STA Tx/Rx Time
March 2015 Theoretical Calculation of time in each state - STA Tx/Rx Time STA’s listen time per 40ms (217.5us/40ms= %) 100us (ProbeDelay)+( 34us(AIFS)+9us*15/2 (Backoff)+16us(SIFS) )*2 =335us 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 Yanchun Li (Huawei Technologies)

Theoretical Calculation of time in each state - STA Sleep Time
March 2015 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% Yanchun Li (Huawei Technologies)

Simulation results Simulation results matches the theoretical analysis
March 2015 Simulation results Simulation results matches the theoretical analysis MAC throughput: 29.6 kbps in both DL/UL, PER = 0% Breakdown of percentage of time STA (%) AP (%) time precentatge Listen RX TX Sleep < Power Save Mechanism > On Theoretical 0.84% 0.76% 97.64% 98.48% 0.00% Simulation < Power Save Mechanism > Off *AP listens to the channel all the time (except TX and RX) Yanchun Li (Huawei Technologies)

Breakdown of Power Consumption
March 2015 Breakdown of Power Consumption Power consumption STA (%) AP (%) Power Precentage 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 < Power Save Mechanism > Off - Energy Efficiency Ratio: =0.0635 Yanchun Li (Huawei Technologies)

March 2015 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 Yanchun Li (Huawei Technologies)

Reference [1] 11-14-0980-06-00ax-simulation-scenarios.docx (2015 Jan)
March 2015 Reference [1] ax-simulation-scenarios.docx (2015 Jan) Yanchun Li (Huawei Technologies)

Recap: Power save test parameters in [1]
March 2015 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 Yanchun Li (Huawei Technologies)