advanced ranop chapter 1 - rf coverage pff

7/25/2019 Advanced RANOP Chapter 1 - RF Coverage PFF

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NOKIA Training Center / RDM

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


7/23% NOKIA Training Center / RDM

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.


8/23( NOKIA Training Center / RDM

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.


9/23, NOKIA Training Center / RDM

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


10/231- NOKIA Training Center / RDM

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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161'

er70*$in82!/FR 9*$in8 Ratio :2!;< avg7tc&7er$ang/Average TC= r$ang :*er &o0r

advanced ranop chapter 1 - rf coverage pff

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