1 / 23

WiMAX Communication

INTERNET BACKBONE. BWA Operator Network Backbone. WiMAX Communication. By Saeed Mohi Adil Al-Shahrani. For Dr. Landolsi, Mohamed. WiMAX.

talib
Download Presentation

WiMAX Communication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. INTERNET BACKBONE BWA Operator Network Backbone WiMAX Communication By Saeed Mohi Adil Al-Shahrani For Dr. Landolsi, Mohamed

  2. WiMAX * WiMAX is a wireless digital communications system* WiMAX can provide broadband wireless access (BWA)* IEEE 802.16, " Wireless Metropolitan Area Networks (WMAN)“* up to 30 miles (50 km) for fixed stations, and 3 - 10 miles (5 - 15 km) for mobile stations.  * The word WiMAX stands for Worldwide Interoperability for Microwave Access

  3. Is WiMAX different from Wi-Fi? • WiMAX to Wi-Fi as Cellular to a Cordless Phone • Provide the service for large distance Cordless Cellular • Primarily consumer • License-exempt spectrum • Low cost • Mass market product • Low Power • Carrier Class • Licensed spectrum • Higher Cost • High Power * Higher power increases coverage area

  4. WiMAX Standard • The IEEE standard 802.16 (WiMAX) • revised for 2-11GHz fixed (802.16.a-2004) and 2-6GHz portable (802.16e) mobile wireless solutions. • WiMax uses Orthogonal Frequency Division Multiplexing (OFDM) for modulation in its physical layer, which bundles data over narrowband carriers transmitted in parallel at different frequencies. • OFDM makes WiMax scalable for a fluctuating user base, since the spectrum can be dynamically reallocated (range: 1.25-20 MHz) with variations in the number of subscribers. • There are a number of challenges facing WiMax including: • RF interference and attenuation • Operator contention for infrastructure placement to maximize performance and reach • Government regulations, spectral licensing/usage management • Concerns with WiMax base station market growth due to bias towards voice networks (like GSM and UMTS)

  5. WiMAX Standard • Orthogonal frequency-division multiplexing (OFDM), also sometimes called discrete multitone modulation (DMT), • complex modulation technique for transmission based upon the idea of frequency-division multiplexing (FDM) where each frequency channel is modulated with a simpler modulation. In OFDM the frequencies and modulation of FDM are arranged to be orthogonal with each other which almost eliminates the interference between channels • Orthogonal Frequency Division Multiple Access (OFDMA) is a multiple access scheme for OFDM systems. It works by assigning a subset of subcarriers to individual users. • OFDMA features • OFDMA is the “multi-user” version of OFDM • Each OFDMA user transmits symbols using sub-carriers that remain orthogonal to those of other users • More than one sub-carrier can be assigned to one user to support high rate applications • Allows simultaneous transmission from several users better spectral efficiency • Multiuser interference is introduced if there is frequency synchronization error • The term "OFDMA" is used in the mobility mode of IEEE 802.16 WirelessMAN Air Interface standard, commonly referred to as WiMAX.

  6. WiMAX Standard • cellular 3G is voice-centric while WiMax is data-centric. • WiMax can achieve data rates up to 75Mbps for fixed stations

  7. WiMax Standards

  8. 802.16 (Dec 2001) 802.16c (2002) 802.16a (Jan 2003) 802.16REVd (802.16-2004) (Oct 2004) 802.16e (802.16-2005) (Dec 2005) 802.16 Standards History • First standard based on proprietary implementations of DOCSIS/HFC architecture in wireless domain • Original fixed wireless broadband air Interface for 10 – 66 GHz: Line-of-sight only, Point-to-Multi-Point applications • Extension for 2-11 GHz: Targeted for non-line-of-sight, Point-to-Multi-Point applications like “last mile” broadband access • Adds WiMAX System Profiles and Errata for 2-11 GHz • MAC/PHY Enhancements to support subscribers moving at vehicular speeds

  9. WiMAX Standard • The presence of two versions of WiMAX • 802.16-2004 WiMAX only supports fixed access, products are available. • 802.16e WiMAX supports mobile and fixed access but products are still. • Vendors need to understand what demand there is for these two technologies in order to refine their product roadmaps and provide the service

  10. IEEE 802.16 Specifications • 802.16a • use the licensed and license-exempt frequencies from 2 to 11Ghz • Support Mesh-Network • 802.16b • Increase spectrum to 5 and 6GHz • Provide QoS (for real-time voice and video service) • 802.16c • Represents a 10 to 66GHz system profile • 802.16d • Improvement and fixes for 802.16a • 802.16e • Addresses on Mobile • Enable high-speed signal handoffs necessary for communications with users moving at vehicular speeds

  11. WiFi WiFi WiFi What are they aiming for? BROADBAND WIRELESS ACCESS 802.16/a Backhaul 802.16 LOS to fixed outdoor antenna 802.16e NLOS to MSS (laptop/PDA..) WiMAX Base Station • Fixed Wireless Access: • DSL to homes and business 802.16a NLOS to fixed Indoor antenna 802.16a NLOS to fixed outdoor antenna MSS: Mobile Subscriber Station; LOS: Line of Sight; NLOS: Non Line of Sight

  12. How WiMax Works • WiMax can provide 2 forms of wireless service: • - Non-LOS where a small antenna on a computer connects to the tower. Uses lower frequency range (2 to 11 GHz). • - LOS, where a fixed antenna points straight at the WiMax tower from a rooftop or pole. The LOS connection is stronger and more stable, so it is able to send a lot of data with fewer errors. Uses higher frequencies, with ranges reaching a possible 66 GHz. • Freq. increases, so Peak of fingers (multipaths) decreases • Through stronger LOS antennas, WiMax transmitting stations would send data to WiMax enabled computers or routers set up within 30 (3,600 square miles of coverage) mile radius ~ 50 km.

  13. WiMax is well suited to offer both fixed and mobile access

  14. EXAMPLE SEIMENS

  15. Flexible and Reliable • Channel Size Software Configurable up to 14MHz • FDD and TDD Duplex scheme • Carrier-Grade redundancy Future Proof Platform • Software upgradeable to IEEE802.16e SOFDMA (Scalable OFDM Access) Scalable • High Scalability “Pay as you grow” • Triple Play services with guaranteed QoS Highest Range • Highest range, High Power system • Subchanneling and RX Diversity (in one ODU) SkyMAX – Forerunner in the WiMAX ArenaSkyMAX BaseStation Siemens SkyMAX Base Station

  16. WIP PSTN SkyMAX – Forerunner in the WiMAX ArenaFixed BWA Reference Architecture Data Back-end SkyMAX Residential CPE User DB Application Servers CRM Billing Voice Air Interface Video Server Farm Public Internet Video Data Voice End User Access Gateway SkyMAX Business CPE IP “Managed” Network Voice Gateway Voice Video Data SkyMAX Basestation GbE End Users Backhauling and Integration in Back-end (e.g user Authentication charging/billing) WiMAX (SkyMAX) Radio Access: BS and CPE User Equipment and Applications Core Network

  17. WiMAX Network

  18. 802.16 Network Entry • Scanning • Scan for BS downlink channel • Synchronize with BS • Specifies channel parameters • Ranging • Set PHY parameters correctly • Establish the primary management channel (for negotiation, authentication, and key management) • Registration • Result in establishment of secondary management connection (for transfer of standard based management messages such as DHCP, TFTP ) • Establishment of transport connection • MAC provides service for upper layers

  19. >150 802.16 Planned Carrier Trials 2005 2006 2007 Source: Intel estimates Worldwide WiMAX Trials

  20. 4G Competitors • A generation is defined by the result of technology changes over a 10-15 year time frame. • Thus, 4G would refer to whatever is deployed in the 2010-2015 period, assuming 3G deployment spans the 2000-2009 period. Typically, this means a new air-interface with higher data rates • Ideally, 4G would provide users with on demand high quality video and audio. • 4G may useOFDM (Orthogonal Frequency Division Multiplexing), and also OFDMA (Orthogonal Frequency Division Multiple Access) to better allocate network resources to multiple users. • Unlike the 3G networks which are a jumble ofcircuit switchedandpacket switchednetworks, 4G will be based on packet switching only. This will allow low-latency data transmission. • According to a Visant Strategies study (quoted in Wireless Week on February 1st, 2006), there will be multiple competitors in this space (4G), and gave the following projections: • WiMAX - 7.2 million units by 2010 • TD-SCDMA - 100 million subscribers (in China) by 2010 • Flash-OFDM - 13 million subscribers in 2010 • UMTS FDD - Valued at $2 billion in 2010

  21. Next Wireless Fixed Mobile Convergence Example: • Korean will start the service by next year (WiBro)

  22. Next Wireless • wireless broadband will emerge as the mainstream technology. • Data traffic is growing more (10 times) compared to the voice traffic • Consequence, the past concept of telephone networks, which also carry data might be replaced by the concept of data networks that also carry voice. • The cost for this service could be much lower than current high-speed Internet-subscription fees because the provider never had to run cables.

  23. Thank you • Questions?? News about WiMAX www.wimaxforum.org

More Related