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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M900/M1800 Base Station Controller
Feature Description Contents
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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M900/M1800 Base Station Controller
Feature Description Contents
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*
M900/M1800 Base Station Controller
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*
M900/M1800 Base Station Controller
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. $e advanta'e is tat te
initial investent is sall.
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Feature Description 8 Dualand (et)or*
----En
8.0 Dualband Networking /odes$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
$e standalone MSC net)or*in' contains te %ollo)in' %eatures;
(o ipact on ori'inal net)or*.
(et)or* plannin' and data con%i'uration are clear to a*e te pro
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8 Dualand (et)or*
M900/M1800 Base Station Controller
Feature Description
standalone MSC net)or*in' as te prole o% collaoration o% euipent o% di%%erentproviders. In a lon'-ter vie)6 it is etter tan i>ed net)or*in'.
&hared /&C &tandalone '&C Networking
Sared MSC / standalone BSC net)or* re%ers to &SM900 and DCS1800 net)or* adopts tesae MSC and di%%erent BSCs %or net)or*in'6 as so)n in Fi'ure 1.1.
Figure 1.1 Sared MSC/standalone BSC net)or*in'
MS
MS
BTS
BTS
BSC
EIR
HLR/AUC
OMC
SMC
GSM900 DCS1800
BTS
BTS
BSC
MSC/VLR
BTS
Sared MSC/standalone BSC net)or*in' as te %ollo)in' %eatures;
Ipact on te ori'inal net)or*. (eed to re-plan (SS and ard to e constructed.
4ard %or capacit! e>pansion. As net)or* develops6 construction and aintenance i't
ecoe di%%icult.
#elative sall initial investent o% net)or* and o% eac suscrier.
Introduce copetition so as to lo)er euipent investent and iprove ualit! o%
service.
Bac*up %unction %or BSC to secure te net)or*.
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M900/M1800 Base Station Controller
Feature Description 8 Dualand (et)or*
&hared '&C Networking
Sared BSC net)or*in' re%ers to tat B$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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