RF Planning Basics[1]

7/21/2019 RF Planning Basics[1]

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IDEA Cellular Limited1

RF BasicsRF Basics




OBJECTIVES…OBJECTIVES…

1.Coverage…

Nos of Cell sites in a givengeograpical area

• Needs the accurate RFpropagation characteristic inthe provided clutter, viz, urban,

suburban, open, etc.• Based on RF propagation model

for different morphological areawe decide the ‘inter!elldistance"

• #ntercelldistance decides the

cell count

2.Capacit!…

Total n"#$ers of TR% to $ee&"ippe' to a cell to caterte pro(ecte' traffic given$! te operator

• !overage area is divided wrt

teledensit$• %verage nos of subscribers is

considered based on &ales"pro'ection.

• %llowing a definite bloc(age inthe traffic…bloc(age in voice

circuits )*+&, we find the nosof total voice channels.

• -otal voice channels divided b$ provides total -R/ with somemargin for signaling time slots.



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Coverage *lanning…Coverage *lanning…

• -here is a O+ ,"#ara -ata o'el based on the RF samplescollected b$ e0tensive drive test in different t$pe ofmorphological clutter in 1apan for the fre2uenc$ range 3443544 6hz, B& antenna height7 849446 and 6& antennaheight7 3346 and distance 394:m.

• -here is another model developed b$ E/ROpean COoperativefor Scientific and Technical Research committeeE/RO COST2)1 o'el. #t 'ust e0tends the fr2uenc$ of operation from35449444 6;z.

• %bove two model are simplified to have simple format ! 0

#. c, where $path loss, m the gradient and is function offre2uenc$ and B&<6& antenna heights, 0 path distance fromB& and c a fi0ed intercept usuall$ termed with db<decade onlogarithmic graph plotted between path loss and disatance.





• -otal area of the coverage is divided into differentmorphological clutter on the digital map…=ense>rban )=>, >rban )>, &uburban )&>, ?uasi +pen)?+ and +pen areas.

• -o correlate the propagation behavior of the RF withthe mentioned model we collect the RF samples inthe clutter of the interest b$ drive test establishedb$ transmitting the fre2uenc$ with the appropriate

power and collecting as much data as we could b$putting the possibl$ small sampling window…%different t$pe of drive test tool…C4 Test Tool…Ca#eleon 5 *anter





• =ata collected out from the !@ -est is thencorrelated with the ;atta +" :umara<!+&- 983model to get #ini#"# error of 7ero an'possi$l! lo8 stan'ar' 'eviation and we get an

appropriate #ntercept )path loss per decade b$formatting the data as $ 7 m.0 A c

• %bove process is called o'el T"ning which isobtained for each morphological clutter.

• Based on the standard deviation we conclude thevalue of Fade margin for each clutter.

• %llowing a definite F6, we obtained a in( BudgetFormula for each of the clutter.




Coverage planning…Coverage planning…

• From in( Budget we get the !ell radius, r and thenthe !ell %rea % 7 9.5CDrE9 for different t$pe ofclutter…=>, >, &>, etc.

• No of sites is obtained b$ dividing the total area

with the cell area.

Nos of sites 7 %)=><!ell %rea)=> A %)><!ell%rea)> A %)&><!ell %rea)&> A …..


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Coverage *anningCoverage *anning

• ;ntenna -eigt… usuall$ C6 above the average clutterheight

=> 99986

> 9G956

Rural 9H846

;ighwa$ 54556

• ;ntenna ;7i#"t… >suall$ 4<394<9G4 deg

• ;ntenna T!pe… *ain, ;B@, IB@,FBR

*ain 3H3 35 93 99

;B@ J5 C4 J5 88IB@ H H G G5

IK=- 4<34 6ech

• @e have antennae with J5<3GLJ5<84 and C4<G5 deg…forsc$scrapers


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• Ca$le T!pe… #n lin( budget cable loss 7 8 dBH<M J dB<3446 )use up to 546

33<G G.5 dB<3446 )use up to J4H46

35< 8 dB<3446 )use O H46 all = 1<>> -7

• T; is to be used for highwa$ sites to compensatethe >plin( power.


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• Coverage Tresol'…@/ A 9> 'B#

/ A 96 'B#

S/ A :> 'B#

Incar A <> 'B#

O"t'oor A <9 'B#

• *at Balance…

0 *at loss @D *at loss /D

• Coverage Criteria…

:6G of Cell E'ge relia$ilit!

?>G of ;rea pro$a$ilit!


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Capacit! *lanningACapacit! *lanningA

• Case St"'! H 1A-raffic<subs 7 26 #ErlL

6ean holding time 7 ?> secs

B-& !onfig 7 )))%bis *o& 7 2G

&a$, ) TS for signalling per cell

Total Nos of S"$s 0


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Capacit! *lanning…Capacit! *lanning…

3. 8A8A8 -R/ config 7 D8 79G P 8 7 93 -!; percell

9. -otal -!; count 7 93D87 J8 nos.

8. %t 9Q of *+&, total traffic, b$ Krlang B -able

-otal -raffic 7 59.G3 Krls

-otal &ubs 7 59.G3<4.495 794CC.9G

eans BTS is a$le to serve )>>> s"$s in te B-.




• Case St"'! H2…; geograpical area categori7e' as @ense /r$an

as a total area of 6 s& ,. KS operation isat 1<>> -7.

-o8 an! BTS 8o"l' $e nee'e' Sa! 8e ave planne' o"r net8orL for 2>G tele

'ensit!. Te #entione' area as a pop"lationof 1 DaL. TaLe average traffic per s"$s as 26

#Erl an' ;$is KOS as 2G.4at so"l' $e te BTS config

;ss"#e 2 TS per cell for signalling as etra#argin.


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• T!picall! for @/ at 1<>> -7 for t!pical BS antennaeigt of 22 an' S antenna eigt of 1.6 8e #a!get Cell Ra'i"s 0 >.69 s& , for F09 'B 8it st. 'ev.Of < 8it a coverage tresol' of 96 'B in o"t'oors.

• Total BTS co"nt 0 6M>.69 0 <.? 0 ? BTS

• Total s"$s 0 1>>>>>>.2 0 2>>>>• Total Traffic 0 2>>>>>.>26 06>> Erl

• Total TC- re&"ire' 0 613 ) b$ Krlang B -able at 9Q *+&

• Total TS 0 613 2?) 0 69<

• Total TR% 0 69<M< 0 :1• TR% per BTS 0 :1M? 0<

• T!picall! 8e ave to 'eplo! 9 nos of BTS 8it))) TR% an' ) nos of 222 TR% config.



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RF Planning Basics[1]