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Worldwide Interoperability for Microwave Access

WiMAX(IEEE 802.16)

by
E. Kishore Kumar
Out line
•
•
•
•
•
•
•
•
•

1.History
2.Specification
3.Architectur
4.Physical layer
5.MAC layer
6.Opetation Network
7.App...
Why we need broadband wireless
access?
• Fill the gap and high data rate wireless LAN
and mobile cellular networks.
• Prov...
Wireless networks
•

Wireless PANs (Bluetooth – IEEE
802.15)
– very low range
– wireless connection to printers etc

•

Wi...
Standards
•

IEEE 802.16 (2001)
– Air Interface for Fixed Broadband Wireless Access System MAC and PHY
Specifications for ...
Introduction
Coverage range up to 50km and speeds up to 70Mbps(shared among users).
Specification
802.16

802.16a

802.16-2004

802.16e-2005

Date
Completed

December 2001

January 2003

June 2004

December...
Architecture
Physical Layer
• Five physical layer modes
Designation
WirelessMAN-SC

802.16e

10 -66 GHz

WirelessMAN-SCa
802.16d

Appli...
Orthogonal Frequency Division
Multiplexing (OFDM)
• Multiplexing technique that divides the channel into
multiple orthogon...
Conventional FDM and OFDM
Orthogonal Frequency Division
Multiple Access (OFDMA)
• Multiple-access/multiplexing scheme
– multiplexing operation of da...
MAC Layer
Service Specific Convergence
Sublayer
MAC Common Part Sublayer

Interface to higher layer
protocols, classifies ...
Network Operation
Applications
•
1.
2.
3.
4.

According to WiMax Forum it supports 4
classes of applications:
Multi-player Interactive Gamin...
Advantage
• Low cast.
• It can support:
NLOS(non line of set)&LOS.
Mesh Network.
Point to Multipoint.
Handoff Technique.
•...
Disadvantage
• Interference issues.
• It is not work proper in weather.
Features
• Use wireless link with microwave or millimeter wave
radios.
• Use licensed spectrum
• Use point-to-multipoint a...
Conclusions
• WiMax becomes the dominant Wireless MAN in
the world market.
• The end-users will have to be extremely easy ...
Querries?
Thank u.
References
• IEEE802.16
• Alcatel White Paper: WiMAX, making
ubiquitous high-speed data services a reality
• Intel White P...
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Worldwide interoperability for microwave access wi max(ieee 802)

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Worldwide interoperability for microwave access wi max(ieee 802)

  1. 1. Worldwide Interoperability for Microwave Access WiMAX(IEEE 802.16) by E. Kishore Kumar
  2. 2. Out line • • • • • • • • • 1.History 2.Specification 3.Architectur 4.Physical layer 5.MAC layer 6.Opetation Network 7.Application 8.Advntage &Disadvantage 9.Conclusion
  3. 3. Why we need broadband wireless access? • Fill the gap and high data rate wireless LAN and mobile cellular networks. • Provide high-speed mobile data and telecommunications services
  4. 4. Wireless networks • Wireless PANs (Bluetooth – IEEE 802.15) – very low range – wireless connection to printers etc • Wireless LANs (WiFi – IEEE 802.11) – infrastructure range – home/office networking • Wireless MANs (WiMAX-802.16) – Similar to cellular networks – traditional base station infrastructure systems
  5. 5. Standards • IEEE 802.16 (2001) – Air Interface for Fixed Broadband Wireless Access System MAC and PHY Specifications for 10 – 66 GHZ (LoS) – One PHY: Single Carrier – Connection-oriented, QoS, Privacy • IEEE 802.16a (January 2003) – Amendment to 802.16, MAC Modifications and Additional PHY Specifications for 2 – 11 GHz (NLoS) – Three PHYs: OFDM, OFDMA, Single Carrier – Additional MAC functions: OFDM and OFDMA PHY support, Mesh topology support, ARQ • IEEE 802.16d (July 2004) – Combines both IEEE 802.16 and 802.16a – Some modifications to the MAC and PHY • IEEE 802.16e (2005) – Amendment to 802.16-2004 – MAC Modifications for limited mobility
  6. 6. Introduction Coverage range up to 50km and speeds up to 70Mbps(shared among users).
  7. 7. Specification 802.16 802.16a 802.16-2004 802.16e-2005 Date Completed December 2001 January 2003 June 2004 December 2005 Spectrum 10-66 GHz < 11 GHz < 11 GHz < 6 GHz Operation LOS Non-LOS Non-LOS Non-LOS and Mobile Bit Rate 32-134 Mbps Up to 75 Mbps Up to 75 Mbps Up to 15 Mbps Cell Radius 1-3 miles 3-5 miles 3-5 miles 1-3 miles
  8. 8. Architecture
  9. 9. Physical Layer • Five physical layer modes Designation WirelessMAN-SC 802.16e 10 -66 GHz WirelessMAN-SCa 802.16d Applicability Below 11GHz Licensed bands WirelessMAN-OFDM Below 11GHz Licensed bands WirelessMAN-OFDMA Below 11GHz Licensed bands WirelessHUMAN Below 11GHz Licensed-exempt bands
  10. 10. Orthogonal Frequency Division Multiplexing (OFDM) • Multiplexing technique that divides the channel into multiple orthogonal sub channels • Input data stream is divided into several sub streams of a lower data rate and each sub stream is modulated and simultaneously transmitted on a separate sub channel • High spectral efficiency, resilient to interference, and low multi-path distortion
  11. 11. Conventional FDM and OFDM
  12. 12. Orthogonal Frequency Division Multiple Access (OFDMA) • Multiple-access/multiplexing scheme – multiplexing operation of data streams from multiple users – Dynamically assign a subset of sub channels to individual users • Wireless MAN-OFDMA based on scalable OFDMA (SOFDMA) – Support scalable channel bandwidths from 1.25 to 20 MHz
  13. 13. MAC Layer Service Specific Convergence Sublayer MAC Common Part Sublayer Interface to higher layer protocols, classifies incoming data, etc. Core MAC functions (i.e., scheduling, connection maintenance, fragmentation), QoS control Privacy Sublayer Encryption, authentication, secure key exchange
  14. 14. Network Operation
  15. 15. Applications • 1. 2. 3. 4. According to WiMax Forum it supports 4 classes of applications: Multi-player Interactive Gaming. Video Conference. Web Browsing and Instant Messaging. Media Content Downloads.
  16. 16. Advantage • Low cast. • It can support: NLOS(non line of set)&LOS. Mesh Network. Point to Multipoint. Handoff Technique. • Coverage:50Km. • Max Data Rate:70Mpbs.
  17. 17. Disadvantage • Interference issues. • It is not work proper in weather.
  18. 18. Features • Use wireless link with microwave or millimeter wave radios. • Use licensed spectrum • Use point-to-multipoint architecture, tower-mounted antennas • Provide broadband and QoS, data transmissions.
  19. 19. Conclusions • WiMax becomes the dominant Wireless MAN in the world market. • The end-users will have to be extremely easy to install. • Focus is too often on technologies – Subscribers pay for services, not technologies – Broadband capabilities are important, but bandwidth is not the only meter to assess service
  20. 20. Querries?
  21. 21. Thank u.
  22. 22. References • IEEE802.16 • Alcatel White Paper: WiMAX, making ubiquitous high-speed data services a reality • Intel White Paper: Understanding WiMAX and 3G for Portable/Mobile Broadband Wireless • WiMAX Forum: www.wimaxforum.com • http://en.wikipedia.org/wiki/WiMax

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