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• Intoduction to Bluetooth
• Brief history
• How does it work?
• Other wireless methods
• Bluetooth devices today
• Future of Bluetooth
Definition
”wireless short-range communications of data and voice between both mobile and stationary devices.”
www.symbian.com
Where does the name come from?
• The 10th century Danish King Harald Blatand
• United tribes in Denmark, Norway and Sweden
SIG
• SIG = Special Interest Group• Global headquarter in Overland Park
(Arkansas, USA)• Driving the development of Bluetooth• Promoter members -Board of Directors, Bluetooth Qualification Review Board
• Associate members• Adopter members
How Bluetooth works?
• Frequency 2.4 gHz (ISM)
• Sends out weak signals (1milliwatt)
• Range 10m
• 721 Kbp/s
• Half-duplex
• Full-duplex
Interference
• What about interference when using many devices in the same area?
• Spread-spectrum frequency hopping
• 1600 times a second
Bluetooth networks
• Personal-area network (PAN, piconet)
• Devices in the net use frequency hopping the same way
• Master, slave
• Up to 8 devices in one piconet
• Several piconets form scatternet
Why use Bluetooth?
• Cheap solution
• Less cables (wireless)
• Automatic (no setup)
• Can be applied to almost anywhere
• Trendy
Infrared
• Information transfer via light
• Must have a line of sight
• Used in remote controllers etc.
• Cannot send data to multiple devices at the same time
• Reliable and low cost
ERF
• Developed by a finnish company
• Highly configurable
• Range 10-20m
• 256 kbps (theoretical max of the net)
• Low cost
• Low power consumption (2 AA batteries, can work upto 2-3 years)
Espotel
Marketing
• Bluetooth is sexy!• Implemented in trendy and fancy
products • Most visible products MP3 players, cell
phones and gaming devices• Used everywhere – at home, work,
hobbies etc.• ”Best thing ever happened to you”
Products using Bluetooth
• Zodiac
• Diva Gem GB4000
• Nokia N-Gage
• Nokia Image Viewer
• Crabat Mobile Media Viewer
Diva Gem GB4000
• MP3 Player, radio and recorder
• Bluetooth
• Incoming calls
• Dialling using voice commands
Daisy Multimedia
Bluetooth 2.0 + EDR• Specification launched November 2004
• EDR (Enhanced Data Rate)
• Faster file transfer
• 2.1 Mbps
• Longer battery life
• Backwards compatible
Future• Bluetooth 2.0 devices on market early
2005
• 150 million devices in the end of 2004
• 470 million devices in the end of 2006
• 2005 concentrated on security issues and power consumption
• 2006 multi-cast, improved range (100m)
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