Transcript WiMAX overview - SUNET

WiMAX - a sneak preview
Torbjörn Lundmark
Copyright © 2005 TietoEnator Corporation
Agenda
 WiMAX overview
– Market
– Technology
– Standard update
 WiMAX architecture
– Network architecture
– OFDM
– MAC/PHY
 Summary
2005-09-16
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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
2005-09-16
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3G Evolution (source: Nokia)
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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
2005-09-16
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2005-09-16
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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
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WiMAX architecture End-to-End Reference
Model
R2
R3
R1
MSS
ASN
CSN
R4
Another ASN
NSP
ASP Netw ork OR
Internet
NAP
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ASN Reference Model
ASN
R3
R6
R1
BS
ASN GW
R4
R8
BS
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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
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MAC
Control
Plane
P
H
Y
MAC
Data
Plane
Service
Specific CS
e.g. IP
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Summary
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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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