Bluetooth 4.0
Low Energy
Advisor:Lian-Jou Tsai
Student:Mu-Ting Huang
Outline
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Motivation
Abstract
Introduction Bluetooth
o Classic
o 3.0+HS
o 4.0
o BLE
Introduction Zigbee
What’s different
What’s BLE good for
How does BLE work
In future
Conclusion
References
Motivation
• Study of feasibility for home automation base on
Bluetooth 4.0
Abstract
• Development of home automation in the past have
required expensive hardware to support the
required protocols, hope this article via Bluetooth
4.0 technology to create a low-cost, highly
convenient home automation systems.
Classic Bluetooth
• 2.0+EDR、 2.1+EDR
• 2.4 GHz ISM band, 80 Channel
• 1~3 Mb/s, <30mA max current
• Up to 100mW, more than 100m range
• Used for mobile、headphone、keyboard…
Bluetooth 3.0+HS
• Support IEEE 802.11 PAL
• Up to 24Mb/s
• Power control
• Used for transfer big file
Bluetooth 4.0
• 2.4 GHz ISM band, 40 Channel
• 1 Mb/s , <15mA max current
• ~10mW , 50m range
• Three mode(Classic、High Speed、Low Energy)
• Used for mobile、watch、sport、Home Automation …
BLE
• It doesn’t support stream.
• It not optimised for file transfer.
• It is designed for sending small chunks of data.
(like command or state)
 Small data、less transfer time、deep sleep、lowpower…
Zigbee
• IEEE 802.15.4 , 868 / 915 MHz / 2.4GHz
• 100~200m range
• 20kb/s~250kb/s
• Short distance、slow speed、low-power、low cost
What’s different?
BLE
Zigbee
Radio Frequency
2.4 GHz
2.4 GHz
Range
10~100 m
10~200 m
Data rate
1Mb/s
250kb/s
Time to send data
<3ms
<10ms
Output power
1uW~15mW
1mW~100mW
What’s BLE good for?
• BLE is already in PCs or mpbile phones.
• Zigbee is low power, but BLE is lower.
• BLE is simple to connecting
How does BLE work?
• 2.4GHz ISM band
• 40 Channels on 2MHz spacing
How does BLE work?
• To broadcast promiscuously
• To transmit signed data to a previously bonded
device
• To advertise their presence to a device wanting to
connect
• To reconnect asynchronously due to a local event
How does BLE work?
• Master informs slave of hopping sequence and when to wake
• All subsequent transactions are performed in the 37 data
channels
• Transactions can be encrypted
• Both devices can go into deep sleep between transactions.
How does BLE work?
• 4 active states
How does BLE work?
• Client
• Host
Support BLE devices
In future
• Lock door when I leave home
• Turn off alarm off I’m already wake up
• Turn on the light when I walk around the house
• Control TV
Conclusion
• Bluetooth 4.0 short distance, low-power, low cost,
suitable for a small amount of data transfer can be
used for home automation.
• Automatic notification master slave’s status, more
easy to control home appliances situation.
References
• 傳統BT與BLE有什麼不一樣？
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（http://wjungle.blogspot.tw/2012/01/btble.html）
• 陳泰全. "藍芽系統之省電方式研究與改善." 臺北科技大學
電腦與通訊研究所學位論文 2011 年 (2011): 1-48.
• Bluetooth 4.0:Low Energy
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（chapters.comsoc.org/vancouver/BTLER3.pdf）
• Zigbee wiki
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（http://zh.wikipedia.org/wiki/ZigBee）
Thanks for your attention