October 2009
Car Communication Based on
Bluetooth Links
Michael HERVE
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Plan of the Presentation
Introduction
Bluetooth Link
Interest of Bluetooth for car
communication
Different phases of Bluetooth
Hands-Free connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Origin of Bluetooth
Idea of universal compatibility
Wireless Link
Hands-Free systems
Interest of using Bluetooth for car communication
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Bluetooth Link
Interest of Bluetooth for car
communication
Different phases of Bluetooth HandsFree connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Link
Mobile Network Link
Mobile Phone
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Link
Mobile Network Link
Bluetooth Link
Bluetooth Device
Mobile Phone
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Coding
sinus wave (440 Hz)
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Coding
sinus wave (440 Hz)
encoded by bluetooth
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth General Information
 Wireless Connection (2.4 Ghz)
 Low Power (1mW for Hands Free) compare to 2W
for GSM
Idea of universal compatibility
Wireless Link
Hands-Free systems
Interest of using Bluetooth for car communication
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth Radio
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Bluetooth profiles
What is a profile ?
Interface specification for communication between
devices
Large range of services for bluetooth devices
(Hands-free, A2DP (audio streaming), File Transfert,
Printer, IRMC, …)
Devices must be able to know which profiles are in
commun with devices that want to be connected with.
Discovery Protocol
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Bluetooth Link
Interest of Bluetooth for
car communication
Different phases of Bluetooth HandsFree connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Interest of Bluetooth for car
 Enable the connection with different phones (for the
different users of the car)
 No Harware/cable is needed
 High compatibility between phone and the device
 Phonebook synchronisation
 Ringtone
 Volume
 Accept/Refuse call
 Discret Mode
 DTMF
 Software can be updated easily
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Interest of Bluetooth for car
 Security Reasons
 Goal : having all phone functionnalities with an easier
HMI (Human to Machine Interface)
 Hands must be substituted by the voice
 Bluetooth allows universal links with most of the
phones
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Bluetooth Link
Interest of Bluetooth for car
communication
Different phases of
Bluetooth Hands-Free
connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Different phases of Bluetooth
Hands free kit connection
Discovery
Pairing
Hello, I am
looking for
bluetooth
devices
Detection of
Profiles
Connection
Hello, I am an
available
Bluetooth
device
Data
Synchronisation
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Different phases of Bluetooth
Hands free kit connection
Discovery
What is your
authentification
Code ?
1234…
This code has
to be typed on
your keyboard
Pairing
Detection of
Profiles
Connection
Data
Synchronisation
Ok !
Now we are
paired
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Different phases of Bluetooth
Hands free kit connection
Discovery
What type of
profile do you
support ?
Pairing
Detection of
Profiles
I can do headset
and hands-free.
What about you ?
Connection
Data
Synchronisation
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Different phases of Bluetooth
Hands free kit connection
Discovery
Pairing
Ok, we are now
connected in
Hands-free.
Detection of
Profiles
Connection
I can do
hands-free.
Data
Synchronisation
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Different phases of Bluetooth
Hands free kit connection
To complete
my phonebook,
I have to
synchronise
with your
contacts
Discovery
Pairing
Detection of
Profiles
Connection
Data
Synchronisation
Ok, I transfer
my 163
contacts.
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Phonebook synchronisation
 The Hands Free synchronizes its phonebook with the
contacts on the mobile phone.
 The phonebook is vocally available at any time through
Voice Recognition, Text To Speech & Voice Tags.
 Synchronisation is done only once (at first connection)
Alessandro Del Piero
Gianluigi Buffon
Fabio Cannavaro
Fabio Grosso
Tiago
David Trezeguet
Automatic
Car Communication based on Bluetooth Links
Alessandro Del Piero
Gianluigi Buffon
Fabio Cannavaro
Fabio Grosso
Tiago
David Trezeguet
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Bluetooth Link
Interest of Bluetooth for car
communication
Different phases of Bluetooth HandsFree connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Disabling phone algorithms
Could you
please disable
your signal
processing
algorithms ?
Ok !
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Disabling phone algorithms
Could you
please disable
your signal
processing
algorithms ?
No !
Ok
???
But in fact
it’s a no !
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Disabling phone algorithms
Initial noised signal
No
longer…
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Common gain on the audio chain
4
1.5
1
0.5
magnitude
I can hear
you very
well …
x 10
0
-0.5
-1
-1.5
0
1
2
3
time
4
5
6
4
x 10
4
1.5
x 10
1
Mobile phone
with Gain 1
0.5
magnitude
Telephony
Network
0
-0.5
-1
-1.5
0
2
3
time
4
5
6
4
x 10
Bluetooth
Device
4
1.5
1
x 10
1
I CANNOT
HEAR
YOU !
magnitude
0.5
Mobile phone
with Gain 2
0
-0.5
-1
-1.5
0
1
Car Communication based on Bluetooth Links
2
3
time
4
5
6
4
x 10
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Common gain on the audio chain
4
1.5
1
0.5
magnitude
I can hear
you very
well …
x 10
0
-0.5
-1
-1.5
0
1
2
3
time
4
5
6
4
x 10
4
1.5
x 10
1
Mobile phone
with Gain 1
0.5
magnitude
Telephony
Network
0
-0.5
-1
-1.5
0
2
3
time
4
5
6
4
x 10
Bluetooth
Device
4
1.5
1
x 10
1
I CANNOT
HEAR
YOU !
magnitude
0.5
Mobile phone
with Gain 2
0
-0.5
-1
-1.5
0
1
Car Communication based on Bluetooth Links
2
3
time
4
5
6
4
x 10
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Improvements: Bluetooth for
wideband telephony… coming soon
NarrowBand
WideBand
speech signal
Encoded via
Bluetooth
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Introduction
Bluetooth Link
Interest of Bluetooth for car
communication
Different phases of Bluetooth HandsFree connection
Improvements
Conclusion
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Conclusion
Presentation of Bluetooth
Integration of Bluetooth in car communication
Limits and exemple of problems encountered
The future of Bluetooth
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin
Thank you !
QUESTIONS ?
Car Communication based on Bluetooth Links
ITN, 15-16 October 2009, Lingotto Fiere, Turin