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Polytechnic University Department of Electrical and Computer Engineering

Polytechnic University Department of Electrical and Computer Engineering. EE-3414 Multimedia Communication. Wireless LAN Bluetooth vs IEEE802.11. By Kettly Joseph & Stephan Dubissette. Overview. OSI Model Wireless LAN Definition Configuration Bluetooth Origin and Description

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Polytechnic University Department of Electrical and Computer Engineering

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

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

  3. OSI Model Bluetooth

  4. Example of a connection between client and server

  5. 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

  6. 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

  7. 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

  8. 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.

  9. 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

  10. 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

  11. 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.

  12. 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

  13. Virtual carrier Sense 's mechanismProblem and Solution

  14. 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

  15. 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

  16. 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

  17. 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.

  18. 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

  19. References • http://www.ee.mtu.edu/~dmarcham/bluetooth/ref.html • Standards and protocol - IEEE802.11b - by Al petrick [Online].  Available:       http://www.csdmag.com/main/2000/06/0006stand.htm • Bluetooth and IEEE802.11 - by Brent Miller ( October 2001)- [Online].  Available :      http://www-106.ibm.com/developerworks/wireless/library/wi-phone/?t=gr,p=WirelessBuds • 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.amigocom.com/News/news1-2-03.pdf • http://www.amigocom.com/News/news1-2-03.pdf • http://www.dcs.napier.ac.uk/~bill/cisco_presentation/osi31.pdf

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