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WiMAX

http://en.wikipedia.org/wiki/File:Wimax_base_LTU1.jpg

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Topics

WiMAX ProtocolAbout WiMAXPhysical layer

MAC layer Fixed / Mobile WiMAX WiMAX vs Wi-Fi

WiMAX applications

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What is WiMAX

Worldwide Interoperability for MicrowaveAccess

a last !ile broadband wireless access"#WA$ alternative to cable !ode!%&i'ital (ubscriber )ine "&()$ or T*/+*service,

Wireless Metropolitan Area etwor. "WMA$ #ased on +++ 012,*3

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+++ 012,*3 (tandards

012,*3,*-211* "*1-34 567% line-of-si'ht% up to *48Mbit/s$ 012,*3,2 "!ini!isin' interference between coexistin'

WMAs,$ 012,*3a-2114 "2-** 5h7% Mesh% non-line-of-si'ht$ 012,*3b-2118 "9-3 5h7$ 012,*3c "detailed syste! profiles$ 012,*3e-2119 "Mobile Wireless MA$ : called Mobile

WiMAX 012, *3-211;-Current, Air nterface for Fixed and Mobile

#roadband Wireless Access (yste!,, 012,*3!-in pro'ress% data rates of *11 Mbit/s !obile < *

5bit/s fixed "85$

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(tandard

Fa!ilyPri!ary=se

>adioTech

&ownlin."Mbit/s$

=plin."Mbit/s$

otes

WiMAX

012,*3Mobilenternet

MM?-(?F&M

A

*20 "in21M67bandwidth$

93 "in21M67bandwidth$

+++ 012,*3!expected to offerpea. rates of atleast * 5bit/s fixedspeeds and

*11Mbit/s to !obileusers,

)T+ =MT(/85(M

5eneral85

?F&MA/MM?/(C-F&MA

*11 "in

21M67bandwidth$

91 "in

21 M67bandwidth$

)T+-Advancedexpected to offer

pea. rates up to *5bit/s fixed speedsand *11 Mb/s to!obile users,

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Purpose of WiMAX

Providin' portable !obile broadband

connectivity across cities and countries throu'h

a variety of devices,

Providin' a wireless alternative to cable and&() for last !ile broadband access,

Providin' data% teleco!!unications "@oP$ and

PT@ services,

Providin' a source of nternet connectivity as

part of a business continuity plan,

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Fixed and Mobile WiMAX

Fixed WiMAX is opti!ised for ho!e/office

networ.s

Mobile WiMAX is opti!ised for !obiles

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Fixed WiMAX

+++ 012,*3d "currently bein'updated$

T*/+* substitute *#( : thousands of users

91.! covera'e B9Mbps Cannot have both si!ultaneously

)?( full duplex *1Mbps at *1.! )?( "urban$ *1Mbps over 2.! 5ettin' hi'herDD

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Fixed WiMAX Architecture

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Mobile WiMAX

+++ 012,*3e/012,*3 211;!er'er

2-4.! covera'e "opti!al$ 6i'h speed hand over

" 91!s latencies$ +nsures perfor!ance at vehicular

speeds 'reater than *21.!/h 41Mbps for downlin. *9Mbps for uplin. #ut 'ettin' better all the ti!e

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WiMAX as cellular alternative

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WiMAX as a mobile voice and data network is

potentially exponentially more efficient (profitable)

than the leacy cellular infrastructure

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WiMAX Architecture

MI! " Manaement Information !ase

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012,*3 protocol

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012,*3 protocol stac.

012,*3 covers data lin. and physical layer

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012,*3 MAC (ublayer Protocol

Classes of service

*, Constant bit rate service,

2, >eal-ti!e variable bit rate service,

4, on-real-ti!e variable bit rate service,

8, #est-effort service,

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Physical layer "P6E$

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P6E cont,

#P(G * bit/baud HP(G 2 bits/baud

HAM-*3G 8 bits/baud

HAM-38G 3 bits/baud +xa!pleG a 29 M67 bandwidth% HP( can

deliver 91 Mbps% HAM-*3 *11 Mbps%

HAM-38 *91 Mbps!aud (!d)# measure of the symbol rate$ the number of distinct symbolic

chanes (sinallin event) made to the transmission medium per second in

a diitally modulated sinal

%& !d means that %& symbols are transmitted per second'

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T&& and F&&

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?F&M

FM FM

FM uses bandwidth which is not available for use in

FM

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mni directional antenna

?!ni directional antennasare used for point-to-

!ultipoint confi'urations,

its ener'y is 'reatly

diffused in broad-castin'431 de'rees

This li!its its ran'e and

ulti!ately si'nal stren'th

'ood for situations where

there are a lot of

subscribers located very

close to the base station

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*ector antennas

focusin' the bea! ina !ore focused area

offers 'reater ran'e

and throu'hput with

less ener'y

Many operators will

use sector antennas

to cover a 431-de'ree

service area rather

than use an o!ni

directional antenna

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Fre,uency +lan

!y reusin

fre,uencies at

different basestations- a WiMAX

operator can avoid

interference from

their own network

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WiMAX vs Wi-Fi

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WiMAX vs Wi-Fi cont,

WiMAX is desined to cover lare area

(multiple homes.buildins)- while Wi/Fi is to

cover small area (a home.buildin)

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30Co!parison of WiMAX% WiFi and 45 technolo'y

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WiMAX applications

#roadband nternet

Multi!edia

P !ulti!edia subsyste! "M($ Cellular Alternative

A clear alternative to connect areas without pre-

existin' physical cable or telephone networ.s orJust areas without ## access

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#roadband nternet

KFixed WiMAX is substitute for 01

KMobile WiMAX has larer coverae than WiFi

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WiMax in = ConnectMK,a co!pany owned by the Milton eynes

Council% currently operates a WiMAX networ. in the

town of Milton eynes% the first one in the = to have

this service, Urban WiMax% a WiMax service that covers central

)ondon "travelcard Lone * and so!e of Lone 2$,

LiveWave% a wireless service offered by Wildcard

etwor.s with speeds of up to 81Mb throu'houtewcastle-upon-Tyne,

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>eference

Tannenbau! Co!puter etwor.sN (tallin's wireless co!!unications