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WiMAX - a sneak preview

WiMAX - a sneak preview. Torbjörn Lundmark. Agenda. WiMAX overview Market Technology Standard update WiMAX architecture Network architecture OFDM MAC/PHY Summary. Today's Wireless Market. End-user are used to high bandwidth from fixed sources Expects the same behaviour from wireless

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WiMAX - a sneak preview

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  1. WiMAX - a sneak preview Torbjörn Lundmark

  2. Agenda • WiMAX overview • Market • Technology • Standard update • WiMAX architecture • Network architecture • OFDM • MAC/PHY • Summary

  3. Today's Wireless Market • End-user are used to high bandwidth from fixed sources • Expects the same behaviour from wireless • The initial launch of WCDMA has not been a success • ~30 million subscriber where half in NTT DoCoMo NW • 2/3 of the subscriber added as late as 2005 • Initial 3G promises far from fulfilled (wireless video, coverage, etc) • A “need for speed” required from existing telco operators • Afraid of being left behind • Competing with wireless MAN provider • Needs to be prepared for future growth of data traffic • Protect their 3G investment • A need for lower rural coverage cost

  4. 3G Evolution (source: Nokia)

  5. What is WiMAX, 802.16d and e • A specification of 915 pages accepted in 2004. A member of the IEEE802 family of specifications. • IEEE802.16-2004 include P2P, P2MP and mesh access networks • 2-11GHz NLOS 10-66 GHz LOS • During 2005 IEEE 802.16e includes mobility. • During 2005 MIB standardized as well • IEEE802.16 is supported by the industry group WiMAX • IEEE802.11 is supported by the industry group WiFi

  6. WiMAX vs. 3G, pros and cons • Cost • Lower equipment cost for WiMAX due to certified products (compare with WiFi) • WiMAX require new infrastructure while HSPA rides on UMTS • Coverage • Roughly the same coverage (average ~5 km) • Performance • Roughly the same performance (average ~2 Mb/s per user) • Market window • HSDPA launches in 2006 while HSUPA will come in 2008? • WiMAX standard set end of 2005 -> first products in 2007 • Acceptance • HSPA has a higher acceptance with mobile operator

  7. WiMAX architecture End-to-End Reference Model

  8. ASN Reference Model

  9. WiMAX BS architecture • OFDM • Modulation technique, spread spectrum • Used in e.g DSL, WLAN, WiMAX • MAC, control plane, user plane • Manage resources on the air interface • QoS • ARQ • Mobility Management • Radio Resource Management • Location • PHY • OFDM • MIMO • Modulation MAC Data Plane P H Y MAC Control Plane Service Specific CS e.g. IP

  10. Summary • Standard for WiMAX mobile solution not finalized yet • No products certified by WiMAX forum yet • Test network in Skellefteå shows promising results • According to analysts WiMAX will take significant market shares • Which standard will rule next–generation broadband wireless?

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