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Low Power Consumption Opportunity in Sub 1 GHz

This presentation explores the opportunity of low power consumption for 802.11 in the sub 1 GHz band, highlighting the benefits and drawbacks of this approach. It discusses the potential usages, traffic patterns, and power consumption analysis, emphasizing the importance of low sleep state power consumption for achieving multiple years of battery life.

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Low Power Consumption Opportunity in Sub 1 GHz

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  1. Low Power Consumption Opportunity in Sub 1 GHz Authors: Date: 2010-11-08 Minyoung Park, Intel Corp.

  2. Abstract • This presentation shows an opportunity that enables low power consumption for 802.11 in sub 1 GHz band Minyoung Park, Intel Corp.

  3. 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 Minyoung Park, Intel Corp.

  4. 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 Minyoung Park, Intel Corp.

  5. Example: Using Existing Home Network for Smart Grid and Healthcare Healthcare Home Gateway Smart Meter Smart Grid Washer Refrigerator Minyoung Park, Intel Corp.

  6. 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% B (Tx period) A (Active state period) Sleep to Active Listen Tx Rx Active to Sleep Power consumption SIFS DIFS CW=7 DATA ACK DIFS Tx Rx Sleep time Minyoung Park, Intel Corp.

  7. Numerical Results Tx=300mW, Rx=200mW Tx=700mW, Rx=500mW Tx=800mW, Rx=600mW Tx=1000mW, Rx=800mW Multiple years of battery life • Multiple years of battery life can be achieved with low Sleep state power consumption and low duty cycle traffic Minyoung Park, Intel Corp.

  8. 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 Minyoung Park, Intel Corp.

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