Doc.: IEEE 802.11-10/1268r0 Submission November 2010 Minyoung Park, Intel Corp.Slide 1 Low Power...
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doc.: IEEE 802.11-10/1268r0 Submission November 2010 Minyoung Park, Intel Corp. Slide 1 Low Power Consumption Opportunity in Sub 1 GHz Date: 2010-11-08 N am e A ffiliations A ddress Phone em ail M inyoung Park IntelCorp. 2111 N E 25 th A ve. Hillsboro O R 97229 503 712 4705 [email protected] Em ily Q i IntelCorp. [email protected] Authors:
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Transcript of Doc.: IEEE 802.11-10/1268r0 Submission November 2010 Minyoung Park, Intel Corp.Slide 1 Low Power...
doc.: IEEE 802.11-10/1268r0
Submission
November 2010
Minyoung Park, Intel Corp.Slide 1
Low Power Consumption Opportunity in Sub 1 GHz
Date: 2010-11-08
Name Affiliations Address Phone email Minyoung Park Intel Corp. 2111 NE 25th Ave.
Hillsboro OR 97229 503 712 4705 [email protected]
Emily Qi Intel Corp. [email protected]
Authors:
doc.: IEEE 802.11-10/1268r0
Submission
November 2010
Minyoung Park, Intel Corp.Slide 2
Abstract
• This presentation shows an opportunity that enables low power consumption for 802.11 in sub 1 GHz band
doc.: IEEE 802.11-10/1268r0
Submission
Sub 1 GHz
• Pros– Unlicensed spectrum– Better transmission range than 2.4 or 5 GHz bands– Better coverage in buildings
• Cons– Narrower frequency spectrum than 2.4/5 GHz (US: 26 MHz wide)– Data rates expected to be lower than 802.11a/b/g/n
• Suitable for small and simple devices to wirelessly connect to the Internet
November 2010
Minyoung Park, Intel Corp.Slide 3
doc.: IEEE 802.11-10/1268r0
Submission
Usages and Traffic
• Usages– Smart metering (electricity, gas, water, …)
– Sensors (home, health, building, …)
– Collecting information from simple devices
– ...
• Traffic– Low duty cycle: data may be collected every few minutes, hours, or days
– Small packet sizes: 10s or 100s of bytes
• Many small devices are expected to be battery powered– Low power consumption required for multiple years of battery life
November 2010
Minyoung Park, Intel Corp.Slide 4
doc.: IEEE 802.11-10/1268r0
Submission
Home Gateway
Smart Meter
Refrigerator
Washer
Smart Grid
Healthcare
Example: Using Existing Home Network for Smart Grid and Healthcare
Minyoung Park, Intel Corp.Slide 5
November 2010
doc.: IEEE 802.11-10/1268r0
Submission
Power Consumption Analysis• Simple power consumption analysis for low duty cycle traffic
• Parameters– Battery capacity = 900 mAh (general AA battery), operating voltage = 3 V
– PHY rate for 5 MHz channel • Data frames: 54 Mbps/4 = 13.5 Mbps
• Control frames: 6 Mbps/4 = 1.5 Mbps
– Sleep to Active + Active to Sleep time = 10 msec
– Traffic• Data packet size = 256 bytes, ACK = 14 bytes
• A Data frame transmitted every 2 minutes (= Tx period)
• Duty cycle = A/B ~ 0.009%
November 2010
Minyoung Park, Intel Corp.Slide 6
DIFS CW=7 DATA ACK
Power consumption
Tx
Rx
Sleep
Sleep to Active Active to Sleep
DIFSSIF
S
Listen Tx Rx
time
B (Tx period)
A (Active state period)
doc.: IEEE 802.11-10/1268r0
Submission
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
8.00
9.00
10.00
0.005
0.020
0.035
0.050
0.065
0.080
0.095
0.110
0.125
0.140
0.155
0.170
0.185
0.200
0.215
0.230
0.245
0.260
0.275
0.290
0.305
0.320
0.335
batt
ery
life
(yea
rs)
power consumption in Sleep (mW)
Numerical Results
November 2010
Minyoung Park, Intel Corp.Slide 7
Multiple years of battery life
Tx=300mW, Rx=200mW
Tx=700mW, Rx=500mW
Tx=800mW, Rx=600mW
Tx=1000mW, Rx=800mW
• Multiple years of battery life can be achieved with low Sleep state power consumption and low duty cycle traffic
doc.: IEEE 802.11-10/1268r0
Submission
Summary
• Opportunity for low power consumption for 802.11
• Leverage low duty cycle traffic
• Low Sleep state power consumption is more important than transmit/receive power consumption
November 2010
Minyoung Park, Intel Corp.Slide 8
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