01-8 dualband network

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M900/M1800 Base Station Controller

Feature Description Contents

Contents

8 Dualband Network.....................................................................8-1

8.1 Introduction....................................................................................................................................................8-2

8.1.1 Application.................................................................................................................................... ........8-2

8.1.2 Availailit!................................................................................................................................... .........8-2

8.1." #estrictions............................................................................................................................................8-2

8.2 $ra%%ic &uide Strate'! in Dualand (et)or*.................................................................................................8-"

8." Features o% DCS1800.....................................................................................................................................8-+

8.".1 ,ropa'ation Caracteristics o% DCS1800..............................................................................................8-+

8.".2 DCS1800 Covera'e #euireents........................................................................................................8-+

8."." DCS1800 Covera'e Mode....................................................................................................................8-+

8. Dualand (et)or*in' Modes.........................................................................................................................8-

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Figures

Figure 8-1&SM900/DCS1800 dualand net)or*..............................................................................................8-2

Figure 8-2Cell la!ers and levels.........................................................................................................................8-5

Figure 8-3Standalone MSC net)or*in' ode...................................................................................................8-

Figure 8-4Sared MSC/standalone BSC net)or*in'....................................................................................... ..8-8

Figure 8-5Sared BSC net)or*in'.....................................................................................................................8-9

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Tables

Table 8-1Cell selection/reselection ierarc!.................................................................................................. ...8-

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8 Dualband NetworkAbout This Chapter

$e %ollo)in' tale lists te contents o% tis capter.

Title Description

8.1Introduction Introduces te application6 availailit!6 and restrictions o%

te dualand net)or*.

8.2$ra%%ic &uide Strate'! in

Dualand (et)or*

Descries te tra%%ic 'uide strate'! in te dualand

net)or*.

8."Features o% DCS1800 Descries te %eatures o% te DCS1800.

8.Dualand (et)or*in'

Modes

Descries te dualand net)or*in' odes.


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8 Dualand (et)or*


Feature Description

8.1 Introduction

8.1.1 Application

$e dualand net)or* is a net)or* coined &SM900 and DCS1800. In te dualandnet)or*6 a &SM dualand MS can counicate on eiter te &SM900 and or te DCS1800

and. 7ac cell in a dualand net)or* contains one o% te %reuenc! ands onl!. $e

dualand net)or* allo)s cell reselection6 distriution6 and andovers et)een &SM900 cellsand DCS1800 cells. $e application o% a dualand net)or* is as so)n in Fi'ure 1.1.

Figure 1.1 &SM900/DCS1800 dualand net)or*

DCS1800

MSC

GSM900

GSM900

BSC BSC BSC

MSC

BSC

DCS1800

$e dualand net)or* can e used to utilie te aundant %reuenc! resources in DCS1800

%reuenc! and6 to asor net)or* tra%%ic6 and to satis%! te increasin' deand o% net)or*

capacit!.

8.1.2 Aailabilit!

All te versions o% te BSC and B$S support a dualand net)or*. ou do not ave to appl!

%or a special license.

8.1." #estrictions

:en plannin' a dualand net)or*6 a*e rational resource con%i'urations to ensure stead!and stale tra%%ic %or users. I% te resource con%i'urations are irrational6 overloaded call

services on te DCS1800 and )ill increase te con'estion ratio.

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Feature Description 8 Dualand (et)or*

speec cannel o% ot parties. 4o)ever6 it is %ound tat te $C4 o% tis cell is %ull. In tiscase6 directed retr! can e used to assi'n $C4 o% adpansion so as to solve te prole o% sort resource o%

%reuencies. $e otto la!er consists o% DCS1800 ,ico cells6 )ic is to eet te

reuireents o% ot spot and lind spot areas. For te priorit!6 te cell in lo)er la!er as ai'er priorit!.

Considerin' te %uture net)or* developent6 to a*e net)or* plannin' and optiiation

ore detailed and ore %le>ile6 te la!er sould coine )it level division6 tat is to sa!6eac la!er sould e divided into several levels. 7ac la!er o% tese %our la!ers is divided into

1+ priorities.

For te description o% andovers6 re%er to Fi'ure 1.1.

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8 Dualand (et)or*


Feature Description

8." Features o* DC&18++

8.".1 ,ropagation Characteristics o* DC&18++

$e )or*in' %reuenc! o% DCS1800 is t)o ties tat o% &SM900. Accordin' to CGS$-2"1odel and practical e>perience6 te propa'ation loss o% DCS1800 inside stadiu is + dB

'reater tan tat o% &SM900 and te propa'ation loss o% DCS1800 outside stadiu is 10 dB'reater tan tat o% &SM900. $e propa'ation loss inside uildin's is 5@1 dB i'er it

varies %ro aterial to aterial3. $e %ast %adin' o% DCS1800 is a disadvanta'e to realie te

%ine covera'e o% DCS1800 and te condition o% DCS1800 covera'e is directl! related )it teper%orance o% net)or*. Moreover6 electroa'netic di%%raction o% DCS1800 is poorer tat

tan o% &SM900.

8.".2 DC&18++ Coerage #euireents

Gutdoor covera'e

$e outdoor covera'e can e easil! realied i% te distance et)een sites is not too %ar. I%necessar!6 do te %ollo)in';@install te DCS1800 euipent on te site o% ori'inal &SM900 site.

@install te ne) sites in proper places.

Indoor covera'e

In order to 'uarantee te %ine indoor covera'e o% DCS18006 te distance et)een B$Ss

in te cit! sould not e>ceed 1000 . In te cit! )it uildin's in rein%orced concretestructure6 )ic penetration loss is ver! 'reat6 so it is recoended tat te distance

et)een B$Ss sould e 500@800 .

8."." DC&18++ Coerage /ode

$ere are tree covera'e odes %or DCS1800 net)or* in dualand net)or*; Fine continuous

covera'e6 continuous covera'e o% ot spot areas6 scattered covera'e o% ot spot areas.

&tep 1 Fine continuous covera'e

$is covera'e ode as te %ollo)in' advanta'es; DCS1800 is eas! to asor tra%%ic and as

less andovers and i' ualit! o% operation= te %reuenc! plannin' and net)or*optiiation is eas! to e realied and te tra%%ic distriution is eas! to e controlled= a%ter

sites are constructed6 i% capacit! e>pansion is needed6 it is onl! needs to con%i'ure carrier

instead o% constructin' ne) sites= and it is convenient to e constructed and aintained. $edisadvanta'e is tat te investent is lar'e and it is ard to select sites in one tie.

&tep 2 Continuous covera'e o% ot spot areas$is covera'e ode as te %ollo)in' disadvanta'es; te tra%%ic asorption o% DCS1800 isliited and tere are %reuent dualand andovers= strict reuireent %or locatin' tra%%ic ot

spot= it is ard to plan %reuencies and optiie net)or* due to te irre'ular distriution o%

DCS1800 B$Ss. $e construction and aintenance is coplicated. $e advanta'e is tat te

site in i'l! intense areas can e 'radual constructed so as to save te investent.

&tep " Scattered covera'e o% ot spot areas

$is covera'e ode as te %ollo)in' disadvanta'es; te tra%%ic asorption o% DCS1800 islo) and tere are %reuent dualand andovers= strict reuireent %or locatin' tra%%ic ot spot=

it is ard to plan %reuencies and optiie net)or* due to te irre'ular distriution o%

DCS1800 B$Ss. $e construction and aintenance is coplicated. $e advanta'e is tat te

initial investent is sall.

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----En

8.0 Dualband Networking /odes$ree odes %or dualand net)or*in' are;

Standalone MSC net)or*in'

Sared MSC/standalone BSC net)or*in'

Sared BSC.

In 'eneral6 te %orer t)o odes are called standalone net)or*in' and sared BSC net)or*

is also *no)n as i>ed net)or*in'.

&tandalone /&C Networking

Standalone MSC net)or*in' re%ers to tat &SM900 and DCS1800 use di%%erent MSCs %ornet)or*in' respectivel!6 as so)n in Fi'ure 1.1.

Figure 1.1 Standalone MSC net)or*in' ode

MS

MS

BTS

BTS

BSC

EIR

HLR/AUC

OMC

SMC

GSM900 GSM1800

BTS

BTS

BSC MSC/VLR

MSC/VLR

$e standalone MSC net)or*in' contains te %ollo)in' %eatures;

(o ipact on ori'inal net)or*.

(et)or* plannin' and data con%i'uration are clear to a*e te pro


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8 Dualand (et)or*


Feature Description

standalone MSC net)or*in' as te prole o% collaoration o% euipent o% di%%erentproviders. In a lon'-ter vie)6 it is etter tan i>ed net)or*in'.

&hared /&C &tandalone '&C Networking

Sared MSC / standalone BSC net)or* re%ers to &SM900 and DCS1800 net)or* adopts tesae MSC and di%%erent BSCs %or net)or*in'6 as so)n in Fi'ure 1.1.

Figure 1.1 Sared MSC/standalone BSC net)or*in'

MS

MS

BTS

BTS

BSC

EIR

HLR/AUC

OMC

SMC

GSM900 DCS1800

BTS

BTS

BSC

MSC/VLR

BTS

Sared MSC/standalone BSC net)or*in' as te %ollo)in' %eatures;

Ipact on te ori'inal net)or*. (eed to re-plan (SS and ard to e constructed.

4ard %or capacit! e>pansion. As net)or* develops6 construction and aintenance i't

ecoe di%%icult.

#elative sall initial investent o% net)or* and o% eac suscrier.

Introduce copetition so as to lo)er euipent investent and iprove ualit! o%

service.

Bac*up %unction %or BSC to secure te net)or*.

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&hared '&C Networking

Sared BSC net)or*in' re%ers to tat B$Ss o% &SM900 and DCS1800 access te sae BSCor dualand i>ed B$S accesses BSC6 as so)n in Fi'ure 1.1.

Figure 1.1 Sared BSC net)or*in'

MS

MS

BTS

EIR

HLR/AUC

OMC

SMC

GSM900 GSM1800

BTS BSC

MSC/VLR

BTS

BTS

BTS

BTS

BSC

BTS GSM1800/GSM900

Sared BSC net)or*in' as te %ollo)in' %eatures;

,ossile 'reat ipact on ori'inal net)or*6 especiall! )en BSC as a sall capacit!.

(eed to re-plan (SS and BSS and ard to e constructed.

4ard %or capacit! e>pansion. As net)or* develops6 construction and aintenance i't

ecoe di%%icult.

#estricted ne) services.

Cannot introduce copetition tus it is ard to lo)er te cost and to iprove service.

$e sallest initial investent o% net)or* and te lar'est investent %or eac suscrier.

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01-8 dualband network

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