1. 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 Authors:

2. 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

3. 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

4. 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

5. 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

6. 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 DIFSCW=7DATAACK Power consumption Tx Rx Sleep Sleep to Active Active to Sleep DIFS SIFS ListenTxRx time B (Tx period) A (Active state period)

7. doc.: IEEE 802.11-10/1268r0 Submission 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

8. 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