About Bluetooth LE
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Bluetooth LE
1、Version 4.0 LE(Low Energy)of the Bluetooth Core Specification was adopted by the Bluetooth SIG on June 30,2010
2、 Specifically optimized for the lowest power consumption possible
3、 Asymmetry is assumed between peer devices
Central devices are assumed to have larger memory and battery
Peripheral devices are assumed to be constrained memory and battery
Technology Similarities Between BR/EDR and LE
Similarities
1、 Able to reuse BR radio architecture
2、 Able to reuse HCI logical and physical transports
3、 Able to reuse existing L2CAP packet structures
Differences
1、 Discovery/Connection procedures have been optimized
2、 Very short packets
3、 Client/Server architecture
4、 Asymmetric designs between client and server devices
New Connection Model
Bluetooth BR/EDR is largely cable replacement
Headset cables
Mouse cables
Keyboard cables
Bluetooth low energy is application enabling
1、 Accessories for smartphone apps
2、 Internet connected devices
3、 New billion-unit markets
Comparison with Classic Bluetooth
Feature
BR/EDR
LE
Notes
Rf Channels
79
40
2 MHz spacing in LE
Modulation
GFSK
GFSK
Simple and effective
Modulation Index
0.25 to 0.35
0.45 to 0.55
Wider signal-More robust
Max Tx Power
+20 dBm(class 1)
+4 dBm(class 2)
+10dBm
No class structure +10dBm regulatory limit
Packet Format
6
2
ID,FHS,DM,DH,2-DH,3-DH Advertising/Data
Max Packet Size
2875µs =1021 octets
328µs=27 octets
LE very short
Connectable
Page scanning 11.25ms/1.28s
Advertising 1.25ms/1.25s
10x lower power
Connection time
20ms
2.5ms
How does Bluetooth Low Energy Work?
1、 A collection of simple components:
– Simple GFSK 1Mbps radio
– Link Layer with few formats, few states and easy device discovery
– Attribute Profile and Generic Attribute Profile that provide a simple client-server programming model
– Security Model, that starts with AES-128 encryption
2、 These components are optimized for low complexity, low gate count, and low enough power consumption to run on 1.5v coin cells or scavenged power
LE in Android
Extension of Bluez subsystem
Maintains similar architecture to existing Bluetooth software
Bluetooth Certification
1、 Fill BT certification in the application form include bt (one day)
2、 RF Testing and Profile Testing(Three weeks)
3、 Complete Testing Report(One week)
4、 Review Report(One week)
5、 Listing Report to Bluetooth SIG website(One week)
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