Bluetooth Technology

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Bluetooth Technology

• By Corban Tomlinson

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Bluetooth

• The name originated from King Harald Bluetooth of
  Denmark. He united Denmark and Norway in the late
  900s
• http//electronics.howstuffworks.com/bluetooth.htm
  
• The Swedish company decided on the name to show
  the importance of the Nordic regions impact on
  communication technology

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What is it?

• Bluetooth is a wireless technology that allows
  enabled devices to sync and transfer information
• It is designed for short range communication
  replacing the need for physical cables and
  infrared beams while maintaining security
• Key Features Robustness, Low power consumption,
  Low Cost

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Alternatives to Bluetooth

• Ethernet Cord
• Cable Cord
• Electrical Wires
• WiFi
• Infrared Signal

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What is it used for?

• Bluetooth technology wirelessly connects devices
• Some common uses for it are
• Hands free set for calls
• Printing/Fax Capabilities
• PDA synchronization
• Notebook/Laptops
• Mobile Phone
• http//en.wikipedia.org/wiki/BluetoothList_of_app
  lications

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How it connects

• Once the device is turned on it sends out a
  signal searching for other devices
• It operates on the unlicensed industrial,
  scientific, and medical (ISM) radio band
• Once a connection is made, a personal area
  network is formed the signal uses Adaptive
  Frequency Hopping (ADF) to hop along 79
  frequencies about 1600 times per min

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• It also prevents the Bluetooth device from
  interfering with other devices because it only
  uses each frequency for a split second
• The Range of these devices is divided into 3
  classes
•  

Class 1 100 mW 100 meters
Class 2 2.5 mW 10 meters
Class 3 1 mW 1 meter
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Bluetooths Uniqueness

• Bluetooth devices can connect to up to 8 other
  devices at a time
• This product gives the ability to support and
  send data and voice applications
• It doesnt use much power and when it is out of
  use it powers down to save battery reserve
• The new 2.0 version can transfer 3 Mbps which is
  an upgrade from the original 1 Mbps

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Layers of technology

• Bluetooth has individual layers of links and
  channels for different functions
• Physical Channel, Physical Link, Logical
  Transport, Logical Link, L2CAP channel
• These different channels are responsible for the
  radio frequencies, data transmission, and voice
  transfer

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Core System

• Bluetooths core architecture is a design
  consisting of Service Discovery Protocol (SDP)
  and General Access Profile (GAP)
• The SDP allows the Bluetooth devices to discover
  each other, communicate, and form a network
• Each channel in the Bluetooth device communicates
  with both the other channels in its own device
  and the corresponding part of the other connected
  device

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Core Architecture

• Channel Manager creates, manages, destroys L2CAP
  channels to help stream data and service
  protocols for the specific type of data being
  transferred
• L2CAP Resource Manager makes sure access will
  not be denied on radio band, makes sure frequency
  is open
• Device Manager It is responsible for all
  behavior not including data transport. Makes
  device discoverable, connected, and other general
  functions

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Core Architecture

• Baseband Resource Manager controls all access on
  radio medium. It has 2 functions
• 1) the scheduler grants time on channels
• 2) negotiates (manages) the connection to make
  sure the QoS (Quality of Service) required by
  Bluetooth is present

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References

• http//electronics.howstuffworks.com/bluetooth.htm
  
• http//bluetooth.com/Bluetooth/Learn/Benefits/
• http//en.wikipedia.org/wiki/Bluetooth