Polytechnic%20University

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Polytechnic University Department of Electrical
and Computer Engineering
EE-3414 Multimedia Communication
Wireless LAN Bluetooth vs IEEE802.11
By Kettly Joseph Stephan Dubissette
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Overview

• OSI Model
• Wireless LAN
• Definition
• Configuration
• Bluetooth
• Origin and Description
• Layers
• IEEE802.11
• Origin and Description
• layers
• Differences and Similarities
• Conclusion
• Acknowledgement
• References

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OSI Model
Bluetooth
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Example of a connection between client and server

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Wireless LAN

• Definition
• Wireless LAN
• Is a flexible data communication network that is
  used to transmit and receive data over the air by
  using electromagnetic waves
• increases mobility.
• Offers the connectivity and the convenience of
  wired LANs without the need for expensive wiring
  or rewiring.
• Is sometimes more economical to use than wired LAN

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Wireless LAN

• WLAN configuration
• Wireless LAN network can be set up in the four
  following ways
• Independent WLANs
• Microcells and Roaming
• Infrastructure WLANs
• Ad Hoc

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Bluetooth

• Origin
• the name Bluetooth came from a Viking whose
  name was King-Harald Blatand
• Bluetooth was founded in 1994
• L.M. Ericsson of Sweden
• Description
• Bluetooth
• Is a Wireless Network Technology
• Is a Low power microwave link
• Use for short time data transfer
• Use for small indoor distances
• Devices communicate with each other in an Ad-Hoc
  fashion

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Layers (Bluetooth)

• Data Layer
• Bluetooth devices form overlapping networks
  called piconets
• Each piconet can carry a maximum of eight devices
  
• There are two types of packet transfer
• Asynchronous Connectionless (ACL) links for data
  transmission
• Synchronous Connection oriented (SCO) for audio/
  voice transmission.
• The Bluetooth data rate has a gross rate of 1
  Mbps.

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Layers (Bluetooth)

• Physical Layer
• Bluetooth
• Operates in the 2.4 GHz unlicensed ISM
  (Industrial Scientific Medical) band
• Uses
• Gaussian Frequency Shift Keying(GFSK) .
• Frequency hopped spread spectrum FHSS) for
  transmits of data
• Data rate is relatively slow at 1 Mbps
• Sensitivity Level of -70 dB

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IEEE802.11

• Origin and description
• IEEE 802.11 is the standard set by the IEEE for
  wireless network connections
• Target areas for IEEE 802.11 are inside buildings
  and also outdoor uses. 
• There is support for most market applications
• Three different data/voice integration
• 802.11a 5Ghz OFDM
• 802.11b 2,4GHz DSSS
• 802.11g 5GHz OFDM

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Layers (IEEE802.11)

• Data Layer
• two different ways to configure a network in
  Wireless LAN
• Ad-hoc
• there is no structure
• order is maintain using algorithm like the
  spokesman election algorithm
• infrastructure
• network uses fixed network access point
• To widen the wireless LAN the access points are
  sometimes connected from one node to the other
  one by connecting them to landlines.

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Layers (IEEE802.11)

• Physical Layer
• Handles the transmission of data between nodes
• Use DSSS, FHSS( 2.4 - 2.4835 GHz)
• Use IR pulse position modulation (300 - 428,000
  GHz).
• Medium access control (MAC) layers
• Set of protocols responsible for maintaining
  order in the use of a shared medium. (CSMA/CA) or
  VCSM

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Virtual carrier Sense 's mechanism Problem and
Solution
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Layers (IEEE802.11)

• Network Layer
• Handle Security in the network by using
• Mobile IP which
• Is a way to attain wireless networking
• Does not change when it moves form a home network
  to a foreign network.
• Maintains connection with the rest of the network
  by implementing the forwarding routine
• Disadvantage
• need of storing and forwarding of packets while
  the mobile agent is on neither the home nor the
  foreign network
• IP works only for IPv4

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Differences and Similarities

• Differences
• Bluetooth use GFSK (Gaussian Frequency Shift
  Keying) as opposed to CCK (Complementary Code
  Keying) in 802.11
• 802.11 users have much more flexibility in using
  their devices.
• The range of most Bluetooth devices is
  approximately 10 m (33ft).  Whereas 802.11has an
  outdoor range of 300m (1000 ft).
• Bluetooth uses Frequency Hopping and 802.11b uses
  DSSS (Direct Sequence Spread Spectrum)
• All 802.11 addressing and access is taken from
  the Ethernet standard.  Whereas, all the
  addressing is handled by the master of the
  piconets for Bluetooth.
•  Bluetooth is being used for device to device
  data transfer. 
• 802.11 has become more of an access point for a
  computer to get on a wired backbone

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Differences and Similarities

• Similarities
• Bluetooth and 802.11 are both wireless 'network'
  technologies. 
• they both operate in the same 2.4 GHz ISM band. 
• They both are capable of creating ad-hoc networks
  
• They both connect electronic devices without any
  wires

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Conclusion

• These two technologies had in fact really
  different uses and could both add something to
  the wireless market
• Today, attempt to make both Bluetooth and
  IEEE802.11 work together on a same network
• Bluetooth hops through frequencies 640 times
  faster than 802.11 which causes interference.
• To reduce the possibility of interference between
  Bluetooth and 802.11 products, consider using
  frequency hopping instead of direct sequence IEEE
  802.11 wireless LAN radio cards and access
  points.
• The relatively low power signals of the Bluetooth
  devices diminish rapidly over longer distances.

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Acknowledgements

• Our thanks go to
• Prof. Yao Wang for her time and patience
• For our T.A
• Students of the ee3414 class for listening to us

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References

• http//www.ee.mtu.edu/dmarcham/bluetooth/ref.html
  
• Standards and protocol - IEEE802.11b - by Al
  petrick Online.  Available       http//www.csd
  mag.com/main/2000/06/0006stand.htm
• Bluetooth and IEEE802.11 - by Brent Miller (
  October 2001)- Online.  Available
       http//www-106.ibm.com/developerworks/wirele
  ss/library/wi-phone/?tgr,pWirelessBuds
• 10meters.com (2000-2001) Bluetooth and 802.11
  A      Tale of Two Technologies.  10Meters.com,
  San Francisco, CA.      Online.  Available
  http//www.10meters.com/blue_802.htmlhttp//www.am
  igocom.com/News/news1-2-03.pdf
• http//www.amigocom.com/News/news1-2-03.pdf
• http//www.dcs.napier.ac.uk/bill/cisco_presentati
  on/osi31.pdf