Sashi WIMAXf

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WIMAXBY

SHASHI JAKKU


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Contents

Introduction Working of WIMAX IEEE 802.16 standard

802.16 Architecture IEEE 802.16 Specifications eatures of WIMAX Ad!antages of WIMAX o!er WII WIMAX !s. "# ISS$ES in WIMAX !s. "# $%$&E ' WIMAX


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What is WIMAX(

WIMAX stands for Worldwide Interoperability forMicrowave Access

WiMAX refers to )road)and *ire+ess net*orks that are )asedon the IEEE 802.16 standard, *hich ensures co-pati)i+itand interopera)i+it )et*een )road)and *ire+ess accesse/uip-ent

WiMAX, *hich *i++ ha!e a range of up to "1 -i+es, is

pri-ari+ ai-ed at -aking )road)and net*ork access *ide+a!ai+a)+e *ithout the epense of stringing *ires as in ca)+eaccess )road)and3 or the distance +i-itations of 4igita+Su)scri)er 5ine.


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%I7 ' I7%E&7E%

%here are three possi)+e *as toaccess internet. 9road)and access

$ses 4S5 or ca)+e -ode- at ho-e and%1 or %" +ine at office

WII

$ses WII routers at ho-e and hotspots

on the road 4ia+ $p Connection


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7EW %EC7'5'#:

9road)and access is too epensi!eand Wii co!erage is !er sparse.

%he ne* techno+og pro-ises igh speed of )road)and ser!ice

Wire+ess rather than *ired access

9road Co!erage


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13 A WiMAX tower, si-i+ar in concept to a ce++phone to*er Asing+e WiMAX to*er can pro!ide co!erage to a !er +arge area

as )ig as ",000 s/uare -i+es ;8,000 s/uare k-3.23 A WiMAX receiver %he recei!er and antenna cou+d )e a

s-a++ )o or


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WIMAX TOWER WIMAX RECEIVER


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M'4ES ' '


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WIMAX Scenario

Consider a scenario *here a WiMaena)+ed co-puter is10 -i+es a*a fro- the WiMa )ase station.

A specia+ encrption code is gi!en to co-puter to gain

access to )ase station

%he )ase station *ou+d )ea- data fro- the Internetre/uired for co-puter at speeds potentia++ higherthan toda=s ca)+e -ode-s3


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WIMAX Scenario

%he user *ou+d pa the pro!ider -onth+ fee for usingthe ser!ice. %he cost for this ser!ice cou+d )e -uch+o*er than current highspeed Internetsu)scription fees)ecause the pro!ider ne!er had to run ca)+es

%he WiMAX protoco+ is designed to acco--odate se!era+different -ethods of data trans-ission, one of *hich is>oice '!er Internet oIoI< cou+d increase dra-atica++. A+-ostanone *ith a +aptop cou+d -ake >oI< ca++s


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WIMAX CI


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IEEE 802.16

&ange "0 -i+es fro- )ase station

Speed @0 Mega)its per second

re/uenc )ands 2 to 11 and 10 to66+icensed and un+icensed )andsrespecti!e+3

4efines )oth MAC and


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IEEE 802.16 Specifications 802.16a

$ses the +icensed fre/uencies fro- 2 to 11 #

Supports Mesh net*ork

802.16b

Increase spectru- to B and 6 #


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802.16 Architecture IEEE 802.16


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802.16 Architecture


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Mesh Architecture


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EA%$&ES ' WIMAX

Sca+a)i+it

ua+it of Ser!ice

&ange

Co!erage


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Sca+a)i+it

%he 802.16 standard supports f+ei)+e radiofre/uenc &3 channe+ )and*idths.

%he standard supports hundreds or e!enthousands of users *ithin one & channe+

As the nu-)er of su)scri)ers gro* thespectru- can )e rea++ocated *ith process ofsectoring.


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ua+it of Ser!ice


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&e/uire-ents for oS

A configuration and registration function to preconfigure SS )ased oS ser!ice f+o*s andtraffic para-eters

A signa++ing function for dna-ica++esta)+ishing oS ena)+ed ser!ice f+o*s andtraffic para-eters

$ti+iation of MAC schedu+ing and oS trafficpara-eters for up+ink ser!ice f+o*s

$ti+iation of oS traffic para-eters fordo*n+ink ser!ice f+o*s


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&A7#E

'pti-ied for up to B0 -

4esigned to hand+e -an users

spread out o!er ki+o-etres 4esigned to to+erate greater -u+ti

path de+a spread signa+ ref+ections3up to 10.0G seconds


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Co!erage

Standard supports -esh net*orktopo+og

'pti-ied for outdoor 75'Sperfor-ance

Standard supports ad!anced antennatechni/ues


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9E7EI%S ' WIMAX

Speed Faster than broadband service

Wire+ess Not having to lay cables reduces cost

Easier to etend to suburban and rural areas

9road Co!erage Much !ider coverage than WiFi hots"ots


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9enefits to Ser!ice oIideo

aci+itate e/uip-ent co-pati)i+it &educe the capita+ ependitures re/uired for

net*ork epansion


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9enefits to Custo-ers

Range o# technology and service level choices

#ro$ both #ied and !ireless broadband

o"erators

%&'(li)e services at %&' "rices but !ith

"ortability

Ra"idly declining #ied broadband "rices

No $ore %&' *installation+ #ees #ro$

incu$bent


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Wh not WII

Sca+a)i+it

&e+ati!e


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Sca+a)i+it

, Channel bandwidths can be

chosen by operator (e.g. for

sectorization)

, 1.5 MHz to 20 MHz width

channels. MAC designed for

scalability. independent of

channel bandwidth

, MAC designed to spport

thosands of sers.

, !ide (20MHz) fre"ency

channels

, MAC designed to spport 10#s

of sers

$02.1%a$02.11


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-./ b"s0123// Mb"s3.- 4 5/ M12$02.1%a

5.6 b"s012-7 Mb"s5/ M12$02.11

Mai$u$

b"s012

Mai$u$

%ata Rate

Channel

8and!idth

&E5A%I>E


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ua+it of Ser!ice

, &rant're"est MAC

, esigned to spport oice and

ideo fro* grond p

, +pports differentiated ser,ice

le,els- e.g. 1 for bsiness

csto*ers/ best effort forresidential.

, Centrally'enforced o+

, Contention'based MAC

(C+MACA) 3 no garanteed o+

, +tandard cannot crrently

garantee latency for oice4 ideo

, +tandard does not allow for

differentiated le,els of ser,ice on a

per'ser basis

, $02.11e (proposed) o+ is

prioritization only

$02.1%a$02.11


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&ange

, pti*ized for p to 50 6*

, esigned to handle *any sers

spread ot o,er 7ilo*eters

, esigned to tolerate greater

*lti'path delay spread (signal

reflections) p to 10.08 seconds

, 9H: and MAC designed with *lti'

*ile range in *ind

, pti*ized for ;100 *eters

,


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Co!erage

, pti*ized for otdoor


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Securit

, @isting standard is 96M ' @A9, @isting standard is !9A B

!@9

, $02.11i in process of addressing

secrity

$02.1%a$02.11


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Ad!antages of WiMa o!er "#

$sing an assort-ent of proprietarand standards)ased techno+ogies,such as '4M and WC4MA ,WiMa

has a c+ear ad!antage o!er "# %he ad!antages inc+ude

igher %hroughput

5o* Cost 5o*er 5atenc


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WiMAX is i-portant for -o)i+e )road)and*ire+ess, as it co-p+etes "# ) pro!idinghigher perfor-ance for data *ith -ore than 1M)ps do*nstrea- to a++o* connection of

+aptops and


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WiMAX interopera)+e so+utions ena)+eecono-ies of sca+e through integration ofstandard chipsets, -aking WiMAX oru-Certified products costeffecti!e at de+i!eringhighcapacit )road)and ser!ices at +argeco!erage distances in 5ine 'f Sight and 7on5ine 'f Sight conditions


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$SES ' WIMAX


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More HH


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$%$&E

WiMa *i++ )e dep+oed in threestages In the first phase WiMaX techno+og )ased on IEEE

802.16200D3 pro!ides fied *ire+ess connections In the second phase WiMaX *i++ )e a!ai+a)+e as a

cheap and se+finsta++ing Su)scri)er %er-ina+ S%3,+inked to


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ISS$ES in "# !s. WIMAX

4ep+o-ent of the net*ork WIMAX dep+o-ent is in the p+anning

stages and it -ight take "B ears in

pro!iding reasona)+e co!erage in *e++popu+ated areas

WiMa -a initia++ )e re+egated toco++ege ca-puses and +arger corporate

ca-puses *here peop+e are +ess -o)i+eand costs contain-ent is i-portant


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ua+it of Ser!ice %o pro!ide /ua+it of ser!ice ) dep+oing WIMAX

net*orks and to faci+itate the continuous a!ai+a)i+itof ser!ice, carefu+ p+anning is re/uired at the edge of

the net*ork to -anage net*ork -onitoring,a!ai+a)i+it, fai+o!er, routing etc

%his can actua++ )e done using outsourced ser!ices

in cheap +a)or -arkets +ike India and China !ia thepu)+ic Internet


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Cost Issue %he -ain reason to opt for WIMAX is its +o* cost.

%he price paid per for WIMAX spectru- is as-uch as 1000 ti-es +o*er than for "# spectru-

%he +o* cost of WIMAX spectru- co-pared to "# is ac+ear dri!er for ser!ice pro!iders to enter the fie+d of

*ire+ess ser!ices *ith WIMAX


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%he WIMAX oru-

ounded in Apri+ 2001

7o


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&eferences

!!!.e!h.ieee.org0r70chicago09u(WiMAX."d#

htt":00co$"uter.ho!stu##!or)s.co$0!i$a.ht$

!!!.!i$a#oru$.org

htt":00standards.ieee.org0catalog0olis0lan$an.ht$l
http://www.ewh.ieee.org/r4/chicago/Yu-WiMAX.pdfhttp://computer.howstuffworks.com/wimax.htmhttp://www.wimaxforum.org/http://standards.ieee.org/catalog/olis/lanman.htmlhttp://standards.ieee.org/catalog/olis/lanman.htmlhttp://www.wimaxforum.org/http://computer.howstuffworks.com/wimax.htmhttp://www.ewh.ieee.org/r4/chicago/Yu-WiMAX.pdf


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