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Power Consumption Measurement and Clock Synchronization onLow-Power Wireless SensorNetworks
Author : Yu-Ping Chen, Quincy Wu
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Introduction• Applications of Wireless Sensor Networks
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Introduction cont.• Low-Power WiFi system architecture
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Introduction cont.• Digital oscilloscope connection diagram.
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Power Consumption Measurement• Low-Power WiFi and ZigBee
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--The electric current of beaconing status when the Low-Power WiFi signaling strength is -32 dBm.
--The stand-by status of ZigBee.
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Power Consumption Measurement cont.
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--The start- up status of Low-Power WiFi.
--The start- up status of ZigBee.
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Power Consumption Measurement cont.• Average power consumption statistics.
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Power State ZigBee Low-Power WiFi
Signaling strength -32 dBm -79 dBm
Start-up 0.0448 W 0.0396 W
Beaconing 0.0957 W 0.2145 W
Stand-by 0.0756 W 0.0495 W
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Clock Synchronization• Clock synchronization of Low-Power WiFi devices by
NTP.
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Clock Synchronization cont.• Clock synchronization flow chart with NTP.
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Conclusion and Future work
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• Compared with traditional WiFi equipment, the power consumption of Low-Power WiFi is reduced approximate 40%.
• The power consumption of Low-Power WiFi with start-up and stand-by status is lower than ZigBee.
• The power consumption of Low-Power WiFi device when it is receiving beacons from an AP, is twice of the power consumption at its stand-by status.
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Conclusion and Future Work cont.
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• The clock synchronization usually suffers from long latency problems in wireless sensor networks like ZigBee.
• We combines Low-power WiFi devices with NTP, it would be crucial to further investigate the efficiency and accuracy of NTP packet transmission.
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Thanks for your attention.
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