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Bluetooth By: Nick Greaner What is Bluetooth? Bluetooth is an open wireless protocol for exchanging data over short distances (using short radio waves) from fixed ... – PowerPoint PPT presentation

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Title: Bluetooth

  • By Nick Greaner

What is Bluetooth?
  • Bluetooth is an open wireless protocol for
    exchanging data over short distances (using short
    radio waves) from fixed and mobile devices,
    creating personal area networks (PANs). It was
    originally conceived as a wireless alternative to
    certain types of data cables, like the RS-232
    data cable. It can connect several devices,
    overcoming problems of synchronization.

Bluetooth History
  • 1998 The Bluetooth Special Interest Group (SIG)
    is formed with five companies.
  • The name Bluetooth is officially adopted.
  • 1999 The Bluetooth 1.0 Specification is
  • 2000 First Bluetooth mobile phone.
  • First Bluetooth PC Card.
  • First chip to integrate radio frequency,
    baseband, microprocessor functions and Bluetooth
    wireless software.
  • First Bluetooth headset.

Bluetooth History, Cont.
  • 2001 First Bluetooth printer.
  • First Bluetooth laptop.
  • The Bluetooth SIG, Inc. is formed as a
    privately-held trade association.
  • 2002 First GPS receiver.
  • Bluetooth wireless qualified products now number
  • 2003 First MP3 player.
  • First FDA-approved medical system.
  • 2004 First Bluetooth stereo headphones.

Bluetooth History, Cont. Cont.
  • 2005 First Bluetooth Sunglasses.
  • 2006 First Bluetooth watch.
  • First Bluetooth picture frame.
  • Bluetooth wireless reaches an installed base of 1
    billion devices.
  • First Bluetooth alarm-clock radio.
  • 2007 First television with Bluetooth
  • 2009 The Bluetooth SIG adopts Core Specification
    Version 3.0 HS making Bluetooth high speed
    technology a reality.

How Bluetooth Works
  • Bluetooth transmits information through low-power
    radio waves. It communicates on a frequency of
    about 2.45 gigahertz. This frequency band has
    been set aside by international agreement for the
    use of industrial, scientific and medical devices
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How Bluetooth Works, Cont.
  • Bluetooth sends out very weak signals that are
    about 1 milliwatt in power. Cell phones can
    transmit up to 3 watts. Bluetooth devices only
    have a range of around 32 feet due to their low
    power. This cuts the chances of interference
    with your other Bluetooth devices, such as your
    computer or television. Bluetooth doesnt need a
    clear line of sight to communicate with other
    devices, despite its low power. The Bluetooth
    signals wont be blocked by the walls in your
    house, making it the ideal choice for
    communication between devices around your house.

How Bluetooth Works, Cont. Cont.
  • Ex You have a Bluetooth-enabled cell phone, and
    youre not at home. Youre talking with a friend
    on the phone and tell them to call you back
    later. You go home. As soon as you get home,
    your cell phone sends a signal to your computer,
    telling it that you are no longer out and about,
    but are now at home. Your friend calls you back.
    The call is re-routed to your home phone, even
    though your friend called your cell phones
    number. Fancehhh!

How Bluetooth Works, Cont. Cont. Cont.
  • Bluetooth systems create a personal-area network
    (PAN), or piconet. This piconet could have an
    area the size of a house or one as small as from
    your phone to your headset. Once this piconet is
    created, all of the devices will hop from
    frequency to frequency rapidly, in unison, to
    avoid other piconets that may be operating in the
    same room.

(No Transcript)
How Bluetooth Works Frequency Hopping
  • The logical link control and adaptation protocol
    (L2CAP) is the protocol in each Bluetooth
    devices core system (previous slide) that allows
    the devices to communicate to each other which
    frequency they should be on and how fast they
    should be hopping. Before every hop, the devices
    within a piconet send each other packets of
    information. The smaller the packets and the
    faster the hops, the less chance there is for
    devices outside of a piconet to interfere with
    those inside. The average Bluetooth piconet hops
    frequency at a rate of 79 hops per second.

  • Two devices need to be paired once to communicate
    with each other. Pairing usually takes place
    automatically once a device receives a request
    from another device that it is not yet paired
    with. Once a pairing has been established, it is
    remembered by the devices, which can then connect
    to each without user intervention. When desired,
    the pairing relationship can later be removed by
    the user.

Pairing Cont.
  • During the pairing process, the two devices
    involved establish a relationship by creating a
    shared secret known as a link key. If a link key
    is stored by both devices they are said to be
    bonded. A device that wants to communicate only
    with a bonded device can determine the identity
    of the device to be sure that it is the same
    device it previously paired with. Once a link key
    has been generated, an authenticated ACL link
    between the devices may be encrypted so that the
    data that they exchange over the airwaves is
    protected against eavesdropping.

Pairing Cont. Cont.
  • Link keys can be deleted at any time by either
    device. If done by either device this will
    implicitly remove the bonding between the
    devices so it is possible for one of the devices
    to have a link key stored but not be aware that
    it is no longer bonded to the device associated
    with the given link key.

Major Manufacturers
  • Samsung
  • Sony
  • Hyundai
  • LG
  • 3Com
  • Matsushita
  • Acer
  • Billionton International Inc.
  • Canon Inc.
  • 2001 Technology Inc.
  • Motorola
  • Nokia
  • Toshiba
  • Hewlett-Packard
  • Seiko Epson Corporation
  • Apple, Inc.
  • Casio Computer Co. Ltd.

Prices of Major Bluetooth Products
  • Bluetooth Headset 38
  • Bluetooth Adapter 15
  • Bluetooth-enabled wireless phone 80
  • Bluetooth printer 425
  • Bluetooth watch 200
  • Bluetooth mouse 35
  • Bluetooth keyboard 40

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Tis Ze End!
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