8/18/2019 Topology Planning

1/14

Rekayasa Radio TTG4B3SEMESTER GANJIL 2015 – 2016

8/18/2019 Topology Planning

2/14

 Topoloy !la""i"

•

Ne#$o%k #opoloy is &ased o"•  T%a'(• )*#ae %e+*i%e,e"#s

• Mos# -%e+*e"#ly *sed #opoloies• S#a%•

.aisy /ai"• Loop

8/18/2019 Topology Planning

3/14

 Topoloy !la""i"/ai" Ta"de, o% .aisy/ai"

Ada"#aesE'(ie"# *se o- li"k (apa(i#y i- BTSs a%e

(ai"ed #o #e sa,e 2M&ps

Lo$ (o"(e"#%a#io" o- e+*ip,e"# a#"odal poi"#

.isada"#aes I"s#alla#io" pla""i" is esse"#ial as #e

BTSs (lose

I- #e 7%s# li"k is los#8 #e #%a'( o- #e$ole BTS (ai" is los#

e9#e"ded &a"d$id# %oo,i"

 Application: along roads

8/18/2019 Topology Planning

4/14

 Topoloy !la""i"S#a%•

Advantages• Easy to design

• Independent paths which mean link failure affects only

one node

• Easy to configure and install

• Can be expanded easily

• Disadvantages • Limited distance from B! or hub to the B!C

• Inefficient use of fre"uency band

• Inefficient link capacity use as each B! uses the # $bps

• %igh concentration of e"uipment at nodal point

• Interference problem

8/18/2019 Topology Planning

5/14

 Topoloy !la""i" T%ee o% S#a% Ne#$o%k $i# :;B Application: Used for small or medium

size network 

 Ada"#aesE'(ie"# e+*ip,e"# *#ili

8/18/2019 Topology Planning

6/14

 Topoloy !la""i"Ri"LoopBTSs are connected onto two way

multidrop chain Ada"#aes

!%oide #e ,os# %elia&le ,ea"s o- #%a"s,issio"p%o#e(#io" aai"s# ,i(%o$ae li"k -adi" a"de+*ip,e"# -ail*%e

=le9i&ili#y y p%oidi" lo"e% ops $i# #e sa,ea"#e""a si

8/18/2019 Topology Planning

7/14

Ne#$o%k Topoloy a"d =%e+*e"(y!la""i"

8/18/2019 Topology Planning

8/14

Li"k E"i"ee%i" – I"#e%-e%e"(e

• I"#e%-e%e"(e is (a*sed d*e #o*"desi%a&le R= Si"al /o*pli"

•  T%esold is de%aded d*e #oi"#e%-e%e"(e

• .e%aded T%esold %es*l#s i" %ed*(ed%elia&ili#y

8/18/2019 Topology Planning

9/14

Li"k E"i"ee%i" – I"#e%-e%e"(e

&'H

V

Cross (olar Coupling

Sol*#io" @ ;se o- :i !e%-o%,a"(e A"#e""a

8/18/2019 Topology Planning

10/14

Li"k E"i"ee%i" – I"#e%-e%e"(e

Ad)acent Channel

&'

Sol*#io" @ ;se Radio $i# &e##e% Spe(i7(a#io"s

8/18/2019 Topology Planning

11/14

Li"k E"i"ee%i" – I"#e%-e%e"(e

&ront to Back 

T : Hi

R : Low

T : Hi

R : Low

T : Low

R : Hi

T : Low

R : Hi

Sol*#io" @ A"#e""a $i# :i =TB Ra#io

8/18/2019 Topology Planning

12/14

Li"k E"i"ee%i" – I"#e%-e%e"(e

*ver +each

T : Low

R : Hi

T : Hi

R : Low

T : Hi

R : Low

T : Low

R : Hi

T : Low

R : Hi

T : Hi

R : Low

Sol*#io" @ /oose A"#e""a :ei#s s*( a $ay#e%e is "o L)S -o% oe% %ea(

8/18/2019 Topology Planning

13/14

Ne#$o%k Ro*#es Ro*#e/apa(i#ies

I"#e% /i#y %o*#es Ba(k&o"e

Ba(k&o"e %o*#es a%e pla""ed a# Lo$e% =%e+*e"(yBa"ds28 6 a"d G:< =%e+*e"(y Ba"ds a%e *sedBa(k&o"e %o*#es a%e "o%,ally i (apa(i#y %o*#esNo,i"al :op .is#a"(es 25 – 40 C,

I"#%a – /i#y %o*#es A((essA((ess %o*#es a%e pla""ed a# :ie% =%e+*e"(yBa"ds1581D a"d 23 G:< =%e+*e"(y Ba"ds a%e *sedNo,i"al :op .is#a"(e 1 – 10 C,

8/18/2019 Topology Planning

14/14

Ne#$o%k Ro*#es Ro*#e/apa(i#ies

No#e@ #e pa# le"#s o- 79ed li"ks ope%a#i" a&oe 10 G:< i":o" Co"