By Shah Ankur Vasant WIMAX stands for Worldwide Interoperability for Microwave Access The original IEEE 80216 standard now called Fixed WiMAX was published in 2001 WiMAX adopted some of its technology from ID: 515554
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Slide1
Fixed WiMAX
By,
Shah Ankur VasantSlide2
WIMAX stands for
Worldwide Interoperability for Microwave Access
The original IEEE 802.16 standard (now called "Fixed WiMAX") was published in 2001. WiMAX adopted some of its technology from WiBro, a service marketed in KoreaIts a communication technology for wirelessly delivering high-speed Internet service to large geographical areasGeographical Area Coverage: 30 miles Bandwidth: 75 MbpsFrequency bands- 2 to 11 and 10 to 66 Ghz(licensed and unlicensed bands respectively)Defines both MAC and PHY layer
WiMAXSlide3
WiMax Over Wi-Fi
Coverage Area:
Below 100m for Wi-Fi Scalability Supports around 10 usersBitrate: 54 Mbps in 20 Mhz ChannelsCost For Laying Cables throughout.Slide4
802.16 StandardsSlide5Slide6
Wireless access can be divided into three classes
Stationary
PedestrianVehicular802.16 Standards is classified into two types of usage models Fixed WiMAXMobile WiMAXTypes Of WiMAXSlide7
IEEE
802.16-2004
Current Standard for using fixed WiMax3.5 GHz and 5.8 GHz frequency bandsFrequency division duplexing (FDD) Time division duplexing (TDD)IEEE 802.16e - 2005extension to the 802.16-2004supports mobile communications2.3 and 2.5 GHz frequency bands.Slide8
802.16d
802.16e
Spectrum
Below
11 GHz
Below 6GHz
Bit
Rate
Up to 75Mbps @ 20MHz Channel
Up to 15Mbps @ 5MHz Channel
Modulation
OFDM 256 Sub-Carrier QPSK,16QAM,64QAM
Scalable OFDMA
Mobility
Fixed
Fixed and Mobile
Channel Bandwidth
Selectable
Channel Bandwidths between 1.25-20MHz
2.3 - 5 MHz
Cell Radius
3-5 Miles
Depends on tower height, power etc.
1-3 MilesSlide9
WiMAX
Base Station (BS)
Base Station is similar to a cellphone tower and Covers A radius of 30miles(3000 SqFt)WiMAX receiver (WiMAX CPE)Customer Premise EquipmentReceiver could be a small box or PCMCIA card, or they could be built into a laptop
A WIMAX system consists ofSlide10Slide11
Fixed WiMAXSlide12
P2P Point to Point
P2MP Point to Multi Point
Mesh NetworkWiMAX Network ArchitectureSlide13
P2P and P2MPSlide14
MeshSlide15
Non-Line-Of-Sight :
WiFi sort of service, where a small antenna on your computer connects to the tower
uses a lower frequency range -- 2 GHz to 11 GHzLower-wavelength transmissions are not as easily disrupted by physical obstructions -- they are better able to diffract or bend around obstacles.Line-Of-Sight : fixed dish antenna points straight at the WiMAX tower from a rooftop or polestronger and more stableAllows to send a lot of data with fewer errorsUses High Frequencies, ranges reaching 66 MhzLess Interference and More BandwidthModes Of OperationSlide16
Protocol Layers Of WiMAX
802.16 Protocol Architecture has 4 layers: Convergence, MAC,
Transmission and physical, which can be map to two OSI lowest layers: physical and data link
OSI Data Link Layer
OSI Physical LayerSlide17
MAC Protocol:
Convergence
sub-layer:Handle the higher-layer protocols Common part sub-layer:Channel access, connection establishment and maintenance & QoSSecurity sub-layer:Authentication, secure key exchange and encryptionPhysical and transmission layer functions:Encoding/decoding of signalsPreamble generation/removalBit transmission/receptionProtocol ArchitectureSlide18
Physical Layer Features:
Frequency Band
Channel BandwidthMIMOFDD/TDDSignal Modulation:Data Link Layer Features:access protocol,security andsession establishment functions.Slide19
WiMAX
PHY FrameSlide20
Scalability
Quality
of ServiceRangeCoverageFeatures Of WiMAXSlide21
Faster
than broadband service
No need to lay cables thus reducing costEasier to extend to Sub-Urban and rural areasMuch Wider coverageCan use licensed spectrumProvides data, telecommunication services and portability.Advantages of WiMAXSlide22
Lack of Quality
Low
bit rate over Long distanceSpeed of connectivitySharing of bandwidthWiMax over Wi-FiExpensive networkBad WeatherPower consumingDisadvantages Slide23
QUESTIONS
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