Basic course on WiMAX. Marina Settembre Ericsson Lab italy

Transcription

1 Basic course on WiMAX Marina Settembre Ericsson Lab italy

2 Agenda Introduction What is WiMAX? Why WiMAX? WiMAX in the broadband landscape WiMAX architecture scenario and applications WiMAX standards WiMAX spectrum WiMAX features WiMAX value chain and market aspects Conclusions Marina Settembre - WiMAX basic course Ericsson Internal 2

3 What is WiMAX? WiMAX Worldwide Interoperability for Microwave Access (it has become synonymous of IEEE ) Non profit industry trade organization formed to promote and certify compatibility and interoperability of broadband wireless products IEEE , ETSI HiperMAN wireless MAN standards IEEE is a standard for Broadband Wireless Access Initially for fixed and nomadic applications (IEEE a or IEEE revd or ), but now also including limited mobility ( IEEE802.16e) Majority of products found below 11 GHz Licensed and unlicensed bands (2.5, 3.5 and 5.8 GHz) Marina Settembre - WiMAX basic course Ericsson Internal 3

4 WiMAX members At present there are ~ 300 member companies in the WiMAX forum, ~30% are operators Some of the important members are listed below: Airspan networks Alcatel Alvarion Andrew Corporation Aperto Networks Atheros comm. AT&T BT China Motion Telecom Compliance certification services Engim Ensemble Comm. Ericsson Filtronics Fujitsu France Telecom Intel L3 Primewave LCC Motorola MTI Navini Networks News IQ NextWave Telecom Inc Nokia OFDM Forum Powerwave Technologies Proxim Raytheon RF components Redline comm. Ericsson has been active as a principal member of the WiMAX forum since 2004 RF integration RF Magic Siemens SiWave SiWorks SR Telecom Stratex Networks Telenor TowerStream The Telnecity Group TurboConcept Wavesat Wireless WiLAN WaveSat ZTE corporation... Marina Settembre - WiMAX basic course Ericsson Internal 4

5 Why WiMAX? Low cost high performance solution to deliver broadband wireless. One standard Licensed and license exempt spectrum Evolution to fixed to mobile Business opportunity by reaching developed, developing and rural market. Complementing other access technologies Marina Settembre - WiMAX basic course Ericsson Internal 5

6 Wireless landscape Marina Settembre - WiMAX basic course Ericsson Internal 6

7 Wireless networks will coexist Marina Settembre - WiMAX basic course Ericsson Internal 7

8 The Hype cycle Marina Settembre - WiMAX basic course Ericsson Internal 8

9 Gartner Hype cycle (2004) Marina Settembre - WiMAX basic course Ericsson Internal 9

10 WiMAX Why the hype? OFDMA Best Radio Interface for urban env. Ethernet Has killed everything in its way, including ATM (Future) terminals perceived as inexpensive Low complexity, no IPR-tax, global standard Huge volumes. Follow wow for WiFi success story (IEEE ) Aggressive marketing (WiMAX Forum, Intel and others) Marina Settembre - WiMAX basic course Ericsson Internal 10

11 Gartner Hype Cycle 2005 Marina Settembre - WiMAX basic course Ericsson Internal 11

12 Wimax deployment scenarios Marina Settembre - WiMAX basic course Ericsson Internal 12

13 Standards Genealogy (Dec 2001) Original air Interface for GHz Line-of-sight only, Point-to-Point applications a (Jan 2003) Extension for < 11 GHz Targeted for non line of sight, Point-to- Multi-Point applications -> last mile broadband access REV d (June 2004) e (2005 exp.) Revision PAR for & a to address Errata Base for first WiMAX products Amendment for portability and mobility in licensed bands from 2-6 GHz Roaming for portable devices (laptops) within & between service areas Marina Settembre - WiMAX basic course Ericsson Internal 13

14 Performance and features comparison Channel Conditions e June 2004 Pending (formerly d) (est. Q4 2005) Subscribers Fixed / Portable Fixed / Portable / Mobile LOS, Near-LOS, Non-LOS S-OFDMA Modulation OFDM-256 ( ) IEEE Approval Duplexing Sub-Carrier Modulation Channel Bandwidth Data Rate (Peak) Cell Range TDD / FDD BPSK, QPSK, 16QAM, 64QAM Scalable: 1.25 MHz - 20 MHz MHz 15 5 MHz MHz 20+ km: rural 3 km: indoor 2 to 5 km: suburban, urban 5 km: outdoor All Claims Come with Assumptions Data 64QAM Cell 2.5 GHz, BPSK All Assumptions Must Be Tested Mobile Ranges Indoor Install with Marina Settembre - WiMAX basic course Ericsson Internal 14

15 The global spectrum perspective on WiMAX Spectrum in most every market Not Always Harmonized Bands In Contention 3.5 GHz in US 2.5 GHz in Europe 5 GHz in Europe North America: 2.5, 3.5, 5 GHz Europe / Russia: 3.5, 5 GHz Asia Pacific: 2.5, 3.5, 5 GHz Africa / Middle East: 3.5, 5 GHz South America: 2.5, 3.5, 5 GHz Marina Settembre - WiMAX basic course Ericsson Internal 15

16 Spectrum is Spectrum Agnostic but WiMAX defines Profiles Both licenced and unlicenced spectrum but e in licensed only! Marina Settembre - WiMAX basic course Ericsson Internal 16

17 Unlicensed spectrum Unlicensed spectrum: 2.4 GHz and 5.8 GHz Advantages: Fast roll out Lower costs Disadvantages: Interference: other RF systems can also operate in the same spectrum Increased competition: another operator could easily enter the market Limited power: government regulations Availability : the 5.8 GHz spectrum is not currently available in a number of countries Given these disadvantages, operators will carefully evaluate the potential useof unlicensed spectrum, in particular at 2.4 GHz, before rolling out a network Exceptions: rural and remote regions where there is less likelihood of interference and competitions Marina Settembre - WiMAX basic course Ericsson Internal 17

18 Licensed spectrum Licensed spectrum: 700MHz, 2.3 GHz, 2.5 GHz, 3.5 GHz Advantages: The licensed spectrum provides exclusive use of the spectrum Better QoS Disadvantages: 2.5 GHz: at the moment is not in use in Europe and this band is also designated for 3G 3.5 GHz: It is currently available for use in virtually every country but US, radio frequency propagation challenges inherent to this band, licenses restrictions on the spectrum usage ( limiting handoffs) 700 MHz: At this time there is no profile, but some interest in using this band( currently is being used by analog TV broadcasters) 2.3 GHz: usage in adjacent channels limits the amount of available bandwidth WiMAX forum is currently petitioning regulators to change actual policy Marina Settembre - WiMAX basic course Ericsson Internal 18

19 WiMAX PHY Features Features Air interface: Single Carrier, OFDM, OFDMA Adaptive modulation and variable error correction encoding for RF burst TDD and FDD duplexing support Flexible channel sizes (1.75 MHz,3.5 MHz,5MHz, 7MHz, 10MHz, 14MHz, 20MHz) Designed to support smart antenna systems Benefits OFDM suitable for NLOS operation due to the simplicity of equalization Ensures a robust RF link while maximising the bits/s for each users Addresses varying worldwide regulations Provides the flexibility to operate in different frequency bands with different channel requirements Smart antennas are fast becoming affordable and able to mitigate interference and increase system gain Marina Settembre - WiMAX basic course Ericsson Internal 19

20 WiMAX MAC Features Features Packet base protocol Scalable from one to hundreds of subscriber Connection oriented QoS Support:UGS, rtps, nrtps, BE Automatic retransmission request (ARQ) Adaptive modulation support Security and encryption (tryple DES) Automatic power control Benefits Fragmentation and PHS enabled for efficient IP traffic support Cost effective deployments to deliver a robust business case Per connections QoS and faster packet routing Low latency, data prioritisation Hiding RF Layer induced errors from upper layer protocols Higher data rates allowed for channel conditions, higher capacity Protects user privacy Enables cellular deployments by minimising self interference Marina Settembre - WiMAX basic course Ericsson Internal 20

21 WiMAX performance WiMAX performance depends on many variables: Deployment type: LoS vs near-los vs Non LoS Terrain: rural vs sub-urban vs urban Network type: spot vs continuous radio network Radio Characteristics: frequency, channel bandwidth, modulation and coding etc. Too many variables to make simple tables of Bandwidth vs Coverage Marina Settembre - WiMAX basic course Ericsson Internal 21

22 LoS vs NLoS Line of Sight Directional user antennas Mounted on roof-top Fixed only 50 km and 70 Mbit/s Non Line of Sight Antennas inside laptop End user self installation Fixed or limited mobility Coverage & capacity like 3G Evolved Marina Settembre - WiMAX basic course Ericsson Internal 22

23 Spot vs continuous radio cell Marina Settembre - WiMAX basic course Ericsson Internal 23

24 WiMAX and adaptive coding and modulation Adaptive Coding and Modulation: most suited burst profile (predefined coding and modulation scheme) dynamically selected according to radio link conditions Marina Settembre - WiMAX basic course Ericsson Internal 24

25 Examples of coverage Downlink ~ 3Mbps Downlink ~ 4.8Mbps 30m 30m 30 km 5.85 km Downlink ~ 7.3Mbps Downlink ~ 7.2Mbps 30m 30m 1.35 km 0.95 km Marina Settembre - WiMAX basic course Ericsson Internal 25

26 WiMAX Performance Estimate for 64QAM (3,5GHz/7MHz/10W) 20, Spot coverage, Single cell, Suburban, Roof top Continuous coverage, Multi-cell, Urban, Laptop/Indoor Mb/s , ,1 0,9 1 3, radius [km] Marina Settembre - WiMAX basic course Ericsson Internal 26

27 WiMAX and other technologies Marina Settembre - WiMAX basic course Ericsson Internal 27

28 WiMAX value chain Marina Settembre - WiMAX basic course Ericsson Internal 28

29 Product availability Marina Settembre - WiMAX basic course Ericsson Internal 29

30 Conclusions: WiMAX Won t deliver 70Mbps in a 50 km mile cell NLOS Won t have cheaper fixed modem than cable or DSL but it will.. Will provide 10Mbps in a 3km dense urban cell or about a 10 km rural cell Will enable indoor self-install in licensed bands and/or very low frequency versions Will be a DSL complement, supporting nomadic laptop mobility and VoIP telephony and complement services provided by 3G technologies, complement WLAN Will serve as an alternative backhaul for Wi-Fi hotspots Will complement existing microwave solutions especially for low capacity point-topoint applications such as in rural areas Will provide ethernet based BWA, with different level of mobility What Needs To Go Right: e Ratification and Profile Creation Continued Access To Spectrum & Movement Into New Bands Services &Plannings Devices and chips What Could Go Wrong: e Delays Economics and market Marina Settembre - WiMAX basic course Ericsson Internal 30

31 Marina Settembre - WiMAX basic course Ericsson Internal 31