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Providing of QoS in prospective Wi-Fi networks

Saint Petersburg State University of Telecommunications. Providing of QoS in prospective Wi-Fi networks. Roman V. Plyaskin. romick2000@yandex.ru. Advisor: Prof. Alexander E. Ryzhkov. Outline. Review of Wi-Fi networks IEEE 802.11 standard QoS in Wi-Fi networks A Wi-Fi network model.

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Providing of QoS in prospective Wi-Fi networks

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  1. Saint Petersburg State University of Telecommunications Providing of QoS in prospective Wi-Fi networks Roman V. Plyaskin romick2000@yandex.ru Advisor: Prof. Alexander E. Ryzhkov

  2. Outline Review of Wi-Fi networks IEEE 802.11 standard QoS in Wi-Fi networks A Wi-Fi network model

  3. Review of Wi-Fi networks Use of wireless networks Museums Hospitals Conferences

  4. Hotspots Airports Hotels Cafes

  5. Russianoperators Source: J'son & Partners

  6. Top Russian Wi-Fi providers Source: J'son & Partners

  7. Two models of Wi-Fi services providing Commercial Noncommercial 3-15 $ per hour or MB of the traffic Cost of one-time installation and monthly subscription fees

  8. Top Wi-Fi providers by commercial and free-of-charge locations Sources: Company Data, J'son & Partners

  9. Source: J'son & Partners

  10. Number of hotspots Source: J'son & Partners

  11. Source: J'son & Partners

  12. Share of noncommercial hotspots Source: J'son & Partners

  13. According to J’son & Partners, there will be 1250 – 1500 commercial hotspots and 25-30 thousands Wi-Fi users by the end of 2008 According to BroadGroup agency, which has analyzed the fees of 122 operators in 28 countries, the average European fee is € 5,74 per hour (without taxes). Since the beginning of 2004 it has been decreased in 11%.

  14. IEEE 802.11 standard The scope of the standard 802.11 is to develop a medium access control and physical layer specifications for providing quick wireless connectivity between portable and moving stations within a local area.

  15. infrastructure network AP STA1 DS BSS1 AP STA3 ESS BSS2 STA2

  16. Ad hoc network STA1 STA2 BSS1 STA3 STA5 STA4 BSS2

  17. Frequency Hopping Spread Spectrum - FHSS different frequency hopping schemes Direct Sequence Spread Spectrum - DSSS spread by Barker code

  18. 802.11b wireless networks

  19. 802.11g wireless networks

  20. Quality of Service in Wi-Fi networks • voice over Internet Protocol (VoIP) • video streaming • music streaming • interactive gaming QoS allows network owners to leverage the Wi-Fi infrastructure to offer a richer set of services.

  21. Demand for Wi-Fi multimedia applications is growing rapidly due to: • Wi-Fi home networking is spreading rapidly among households • Residential broadband penetration has taken off • New services, digital content, and new applications are becoming more widely available • A wide range of products addressing digital entertainment connectivity are rapidly entering the market

  22. Enterprise market • cost savings • prioritized traffic management Public market Users are increasingly accustomed to VoIP and multimedia applications. • Residential market • a wider array of Wi-Fi-enabled devices • providing wireless voice connectivity • using the Wi-Fi network to distribute content from a media server • establishing wireless connectivity between devices • supporting peer-to-peer networks for telephony or gaming

  23. Access categories

  24. A Wi-Fi network model Access Point Station 1 MPEG-4 Stations downloading files from the Internet

  25. Superframe Contention period (CP) Contention free period (CFP) t TXOP STA1 ACK frames CF - End Beacon Station 1 (MPEG-4) Beacon Data Frames Other stations (Internet data)

  26. Contention free period (CFP) STA2STA3 STA4 STA5 STA6 t TXOP STA1 Contention free period (CFP) STA2 STA3 STA4 STA5 STA6 STA7 STA8 t TXOP STA1 Station 1 (MPEG-4) Other stations (data)

  27. Scenario 1. Throughput

  28. Scenario 1. Delays

  29. Contention free period (CFP) STA2 STA3 t TXOP STA1 Contention free period (CFP) Contention free period (CFP) STA2 STA3 STA4 STA5 t TXOP STA1 Station 1 (MPEG-4) Other stations (data)

  30. Scenario 2. Throughput

  31. Scenario 2. Delays

  32. Scenario 3. Throughput

  33. Scenario 3. Delays

  34. Scenario 4. Throughput

  35. Scenario 4. Delay

  36. Scenario 4. Throughput

  37. Scenario 4. Delays

  38. Scenario 5. Throughput

  39. Scenario 5. Delays

  40. Conclusion • Tendency of Wi-Fi networks spreading in Russia • Importance of QoS implementation in Wi-Fi networks • simulation of a typical Wi-Fi network model • Analysis of the throughput and delays in different transmission scenarios • Realization of QoS requirements needs adaptive software for access points

  41. Thank you!

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