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Submission doc.: IEEE 11-14/1444r1 November 2014 Chinghwa Yu et al, MediaTek Inc.Slide 1 Energy...
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Submission doc.: IEEE 11-14/1444r1 November 2014 Chinghwa Yu et al, MediaTek Inc. Slide 1 Energy Efficiency Evaluation and Simulation Model Date: 2014-10-01 Authors: N am e A ffiliations A ddress Phone em ail Chinghw a Y u M ediaTek Inc. N o. 1, D using 1st Road, H sinchu, 300 Taiw an +886-3-567-0766 chinghw a.yu@ m ediatek.com Jam esY ee jam es.yee@ m ediatek.com A lan Jauh alan.jauh@ m ediatek.com Frank H su frank.hsu@ m ediatek.com ChaoChun W ang M ediaTek U SA 2860 Junction A ve., San Jose, CA 95134 U SA +1-408-526-1899 chaochun.w ang@ m ediatek.com RussellH uang russell.huang@ m ediatek.com G aborBajko gabor.bajko@ m ediatek.com Jam esW ang jam es.w ang@ m ediatek.com
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Transcript of Submission doc.: IEEE 11-14/1444r1 November 2014 Chinghwa Yu et al, MediaTek Inc.Slide 1 Energy...
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 1
Energy Efficiency Evaluation and Simulation Model
Date: 2014-10-01
Authors:
Name Affiliations Address Phone email
Chinghwa Yu
MediaTek Inc.
No. 1, Dusing 1st Road, Hsinchu, 300 Taiwan
+886-3-567-0766
James Yee [email protected]
Alan Jauh [email protected]
Frank Hsu [email protected]
ChaoChun Wang
MediaTek USA 2860 Junction Ave., San Jose,
CA 95134 USA +1-408-526-1899
Russell Huang [email protected]
Gabor Bajko [email protected]
James Wang [email protected]
Submission
doc.: IEEE 11-14/1444r1
Chinghwa Yu et al, MediaTek Inc.Slide 2
November 2014
Name Affiliations Address Phone email
Jarkko Kneckt
Nokia
Esa Tuomaala [email protected]
Sayantan Choudhury
Chittabrata Ghosh [email protected]
Jing-Rong Hsieh
HTC Corp.
6-3 Baoqiang Road, Xindian District, New Taipei City,
Taiwan
+886-2-89124138 ext.23538
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 3
Abstract
• This presentation describes energy efficiency evaluation and simulation model based on the concepts presented in DCN: 11-14/571r5, 11-14/827r3, 11-14/980r4 and 11-14/1162r1.
• Introduce enhancements to power model.• Ideal Power and Energy Source Model to evaluate power saving
mechanisms for generic power supply and battery operating devices.
• Device Energy Model for average energy per bit calculation.
• Define TX, RX, and LISTEN power states and transition.
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 4
Background
• According to the PAR, TGax should also consider the requirement “Maintain or reduce energy per successful information bit, i.e. energy efficiency rating of at least one or less”.
• Base on previous contribution 11-14/827r3, 11-14/967r1 and 11-14/1162r2 proposed Energy Efficiency Ratio, Average Energy Per Bit calculation is required for the metric.
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 5
Energy Consumption Evaluation Framework
• Energy Source Model:• Power source attaches to each
simulation device node.
• Notify Device Energy Model when its capacity drains below a threshold.
• Ideal Power Source:• Constant voltage remains overtime.
• Provides unlimited current (A, Ampere) drain for the load.
• Simulate generic power supply source, e.g. Home.
• Battery Model:• Battery capacity (Ah, Ampere-
hour) depletion rate is a non-linear function of time and the remaining amount of energy in the battery.
Submission
doc.: IEEE 11-14/1444r1
Chinghwa Yu et al, MediaTek Inc.
Why Battery Model required?
• Battery-Driven System Design becomes more and more important, e.g. mobile device system design usually address to determine a balanced design between battery usage and required performance.
• Due to the specific physical nature of batteries, the current extraction pattern of a Power-Saving protocol may also dominate the battery life-time.• Rate capacity effect: the effective capacity decreases quickly under a heavier load -
the current draw is higher than the rated value of the battery.• e.g. A PS protocol significantly drains higher current in a period of time (consecutive
rapid TX/LISTEN/RX state transitions within a short period of time) than another one, this protocol may impact negatively to battery life-time even it has similar EER and consumed power (Watt).
• Recovery effect: battery voltage can be partially recovered during idle periods.• e.g. A PS protocol which has longer sleep time may have longer battery life-time, even it
has similar EER and consumed power (Watt) to another one.
• Battery Model Function: TBD.Slide 6
November 2014
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 7
Energy Consumption Evaluation Framework Con’t
• Device Energy Model:• Calculate average energy per bit
for each device node.
• MAC / PHY States and Transitions:• Notify Device Energy Model for
the duration of the TX, RX, LISTEN and SLEEP power states.
• Power Consumption Parameters:• Voltage (V) and Current (mA)
parameters for different MAC and PHY power states.
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 8
Device Energy Model
• Total energy: the new Ei+1 value during the period (ti , ti+1) as follows:
• Average Energy Per Bit: Time:
Ampere:
Voltage:
Joulesin Energy,:
)( 11
t
I
V
E
ttIVEE iiiii
TB
TE
BEE
T
T
TTavg
interval timeduring bits MSDU successful Total:
interval timeduring consumed Joules,in energy, Total:
/
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 9
PHY Transition Definition
• Transition definitions are based on IEEE 802.11REVmcD3.0 Clause 7 PHY service specification.
Submission
doc.: IEEE 11-14/1444r1
Chinghwa Yu et al, MediaTek Inc.
TX Power State and Duration
Slide 10
November 2014
Submission
doc.: IEEE 11-14/1444r1
Chinghwa Yu et al, MediaTek Inc.
LISTEN / RX Power State and Duration
Slide 11
November 2014
Submission
doc.: IEEE 11-14/1444r1
Chinghwa Yu et al, MediaTek Inc.
MAC PHY Power Consumption Simulation Parameters
• Example Simulation Parameters.
Slide 12
November 2014
Power State parameters
Power State
Average Power Consumption (mW) Average Current Consumption (mA), Voltage = 1.1 V,
Bandwidth = { 20/40/80 MHz }, Band = { 2.4 GHz, 5 GHz }, NSS = { 1 },Number of TX/RX antennas = { 1 }, TX power per antenna = { 15 dBm }
Bandwidth [MHz] 20 40 80
PHY Transmit [mA] 280 285 290
PHY Receive [mA] 100 110 130
Listen [mA] 50 55 60
Sleep [mA] 0.003 0.003 0.003
MAC Transmit [mA] 40 60 80
MAC Receive [mA] 40 60 80
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 13
Conclusions
• Introduce Ideal Power and Battery Source Model to evaluate power efficiency for generic power supply and battery-operated devices.
• Propose Average Energy Per Bit calculation method.• Device Energy Model definition in slide 8.
• Introduce two MAC power states (TX / RX) for power efficiency evaluation.• Define operating duration for MAC and PHY TX / RX / LISTEN
power states.
• MAC/PHY Power Consumption Simulation Parameters in slide 12.
Submission
doc.: IEEE 11-14/1444r1November 2014
Chinghwa Yu et al, MediaTek Inc.Slide 14
References
1. E. Wong, “Energy Efficiency Evaluation Methodology”, IEEE 11-14/827r3.
2. E. Wong, “Energy Efficiency Evaluation MethodologyFollow Up”, IEEE 11-14/1162r1.
3. R. Porat et al, “Evaluation Methodology,” IEEE 11-14/571r5.
4. S. Merlin et al, “Simulation Scenarios,” IEEE 11-14/980r4.
5. M. R. Jongerden and B. R. Haverkort, “Battery Modeling”, TR-CTIT-08-01, Centre for Telematics and Information Technology, University of Twente, Enschede.
6. IEEE 802.11REVmc-D3.0.
7. IEEE Std 802.11ac-2013.
