Advanced RANOP Chapter 1 - RF Coverage PFF
Transcript of Advanced RANOP Chapter 1 - RF Coverage PFF
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RF Coverage
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Objectives
Objectives: Radio coverage discusses options on how to improve existing coverage. The solutions are simple
and practical. In most cases improving the RF environment brings significant improvement compared
to fanc features.
References: !amur "orasilpchai
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Content
Indoor coverage
#ntenna$ down tilt$ overshooting signal
%ombiner and &T! T' power
#ntenna tpe$ down tilt and a(imuth change
#ntenna hopping
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Inoor Coverage
)an networ*s have insufficient indoor coverage due to high building penetration loss.
This includes subwas$ under ground facilities and tunnels.
Outdoor coverage is normall o* in urban and cit area. Interference is more an issuefor outdoor users.
)icro cell and Indoor cell are good solution to improve indoor coverage and networ*+ualit.
Indoor Panel
Antenna
Indoor BTS
Remote Unit
Master Unit
Optical Fiber RF Cable
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Antenna
#ntenna misalignment can cause coverage or +ualit issues.
#ntenna audit should be made regularl and after a major storm.
,ow the antennas are installed on rooftop has also big impact on RF coverage andinterference.
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Antenna Do#n Ti$t
#ntenna down tilt is a ver effective wa for RF coverage optimi(ation.
-arrow hori(ontal and vertical beam width antenna increase the effectiveness ofantenna down tilt but increase the accurac re+uirement for antenna installation.
ualit of the antenna down tilt depends on: electrical down tilt$ down tilt brac*et$antenna support e.g. pole or wall and where the antenna is installed.
#ntenna down tilt can reduce interference and improve indoor coverage.
0odown tilt
2odown tilt
4odown tilt
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Overs&ooting 'igna$
Cluster TA Overshooting cell
Overshooting signal ma*es fre+uenc planning more difficult$ reducesthe effectiveness of fre+uenc reuse and degrades networ* +ualit.
Overshooting can be identified b T# /timing advance0 statistics$ seeexample below.
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Antenna Do#n Ti$t I)*roves Retainabi$it+
#fter antenna down tilt$ retainabilit increase from 123.45 to 126.45
Traffic is onl slightl decrease.
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Co)biner
7IR8 9 &T! T' power combiner loss feeder loss ; antenna gain.
,igher 7IR8 can be achieved b install more feeders and antennas.
uad8ol antenna reduces number of phsical antennas at site.
%hec* ?= lin* balance b compare
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Antenna t+*e. ti$t an ai)0t& c&ange
0%
$0
$%
20
2%
&0
&%
404%
'&$D()%*TAXM
'&$D(+0*TAXM
DB,'2-$20.X
!R+0.$2.00 A/2
34 degree ,ori(ontal ,&" isrecommended for @ sectors site.
7lectrical down tilt isrecommended.
Aariable electrical down tilt isver useful in RF coverageoptimi(ation.
#ntenna #(imuth is adjustedaccording to coverage
re+uirement and trafficdistribution.
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T+*ica$ Antennas
Horizontal Beamwidth Gain Height Vertical Beamwidth
@@o BC d&i B.Bm 6o
34o D6.4 d&i B.4m 3.4o
34o D4.4 d&i D.Bm D@o
2Co DE d&i B.4m 6.4o
2Co DC d&i C.4m @3o
DC4o D3.4 d&i B.4m 3.4o
@3Co DC.4 d&i B.2m Eo
@3Co 6 d&i D.4m D@o
&eamwidths are measured to the half power point /@db down from themain lobe0
These antennas are for 2CC ),( band$ but the same principles appl fordifferent bands.
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a)*$e o RF Coverage O*ti)iation
Cluster Cell NameOriginal
Antenna Model
Rad
CenterAzimuth HBW VBW
Mech
DT
Elect
DT
Host /
e!arat
e
New Antenna ModelNew
HBW
New
Azimuth
Desired
Elec Tilt
Mech
DT
C!/M1A220$2(0','A !R+0.$2.0%A/2 &&% & %
731DG6!TA"M )% #7$ 4 0
C!/M1A220$2(0','B !R+0.$2.00A/2 +0 0 0 -
731DG6!TA"M )% % 4 0
C!/M1A22
0$2(0','C !R+0.$2.0%A/2 2$% & %
731DG6!TA"M )% 13 4 0
C!/M1A2% 0$2(0+%,A !R+0.$2.00DA/2 ++ &&% +0 $2 0 0 - 731DG6!TA"M )% &&% 4 0
C!/M1A2% 0$2(0+%,B !*$0%$000 ++ +% $0% $2 0 0 - 731DG6!TA"M )% +% 4 0
C!/M1A2% 0$2(0+%,C !R+0.$2.00DA/2 ++ 2$% +0 $2 0 0 - 731DG6!TA"M )% 2$% 4 0
C!/M1A2% 0$2(0')%B DB,&& $&' +% $0% $2 % 0 - 731DG6!TA"M )% +% 4 0
C!/M1A$' 0$2(0)20B DB,'4 -$20 $$2 +% $20 $4 0 0 - 731DG6!TA"M )% +% 4 0
C!/M1A$' 0$2(0)20C DB,'4 -$20 $2% 2$% $20 $4 $ 0 - 731DG&$!TA"M +0 2$% 4 0
C!/M1A0, 0$2(0&%,A DB,44-$0% ,0 &&% +0 $% 0 0 - 731DG6!TA"M )% #7$ 4 0
C!/M1A0, 0$2(0&%,B DB,44-$0% ,0 +% +0 $% 0 0 - 731DG6!TA"M )% &$ 4 0
C!/M1A0, 0$2(0&%,C DB,44-$0% ,0 2$% +0 $% 0 0 - 731DG6!TA"M )% 1'$ 4 0
C!/M1A2) 0'2(0+&+A DB,'4-$0% $2) &&% $0% $4 0 0 - 731DG6!TA"M )% &&% 4 0
C!/M1A2) 0'2(0+&+B DB,'4-$0% $2) +% $0% $4 0 0 - 731DG&$!TA"M +0 +% 4 0
C!/M1A2) 0'2(0+&+C DB,'4-$0% $2) 2$% $0% $4 0 0 - 731DG6!TA"M )% 2$% 4 0
The purpose of this RF coverage optimi(ation is to reduce networ*interference /measured b interference matrix$ I)0 without degradationof RF coverage and traffic.
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'ite Trac 5' First Tier Trac
#fter antennas change$ no degradation on traffic /service area>coverage area0.
-o complain from end users.
%hange antenna from wide hori(ontal ,&" /DBC>2C0 to narrower hori(ontal ,&"/340 does not degrade service area and traffic.
C&ange Date6%"! 1-/-!%(% 1-/-!%(( 1-/-"%(, 1-/-%
,3, 1-/-,
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er70*$in82!/FR 9*$in8 Ratio :2!;< avg7tc&7er$ang/Average TC= r$ang :*er &o0r