3G Radio Dimensioning

8/18/2019 3G Radio Dimensioning

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WCDMA Dimensioning Flow chart (RADIM)

Link Budget

UL DL

!"#o

Indoor"$utdoor UL Load (%lanned)

Area"Clutter (&'m)

**

+ &ites"Clutter t,%e(!ased on Re-* &er.ice)

DL /ower"Clutter

For each &er.ice

DL Load

0ra--ic In%ut

mrl"&u!1 !%s"&u!

Acti.it, -actor1 &2$3$4

0hr5%ut Factor1

RealUL Load

2ardware Channels

W&/"#odeB"Clutter

NodeB Power

Ampl of 20W is

enough..?

Is 1 WSP

Card

enough.?

Is the eal

!" "oad#elow the

planned

$alue..?

&tart


2/13

In%ut %arameters

Calculated %arameters

"in% Budget &ef Ser$i'e ( )* !" PS+


3/13

Re'uired DL 0ransmit /ower %er &er.ice 6 7

8 A-ter ha.ing calculated the UL Ma9imum /ath Loss1 the .alue is %ut also in the

DL Ma9 /ath Loss to match and !alance the links (UL"DL)*

8In addition we need to calculate the DL Inter-erence Margin (see slides :6;)8UL Inter-erence Margin is set !, the o%erator re'uirements< usuall, =>?8When DL Inter-erence Margin is calculated (!ased on tra--ic assum%tions gi.en

!, the o%erator) it5s %ossi!le to calculate the DL 0ransmit /ower %er connection

(%er ser.ice and clutter t,%e)

It Is im%ortant to de-ine what is the RFR#C &R4IC1 -or which the#etwork is designed (in this case is 4ideo C& ;: UL since is the most stringent

/L1 $%erator does not %lan -or 7@ or : UL)* 0he UL Link o- the re-erence

ser.ice determines the total num!er o- sites %er clutter t,%e* From this we can

calculate the distri!ution o- Users %er &er.ice %er clutter t,%e


4/13

8 0he re'uired DL %ower is ma%%ed with the re-erence ser.ice1 e*g* #okia uses acorrection -actor (di--erence o- %ath losses !etween the ser.ice and the re-erenceser.ice) which is a%%lied to the A.erage 09 /ower calculated -rom the DL Link Budget<

8 DL 09 /ower &er.ice A (W) A.erage 09 /ower A (W) EMa9/L&er.A Ma9/LRe-&er.

8 0hen1 it is %ossi!le to calculate the ,otal Power-, in'luding CCC/s &W+8 Usuall, CCC25s (W) is @>? total a.aila!le %ower -or DL* $therwise is %ossi!le to stud,

di--erent con-iguration o- CCC25s !ased on di--erent C/IC2 /owers (G =>? o- allCCC25s %ower)

8 Usuall, we assume that there will !e 70RH %er Cell (777 con-ig) with @>W /A*8 0here are %ossi!ilities o- im%lementing R$C con-iguration (7 /A and 7 0RH like omni

case In Radim C W R$C :>W 777 @>W @@@ 7>W @@@ @>W

Re'uired DL 0ransmit /ower %er &er.ice 6 @


5/13

DL Inter-erence Margin 6 7 (-or each clutter t,%e)

8 DL Inter-erence Margin E>*7 J Fractional Loads (linear .alues)

8 Fractional Load is calculated %er ser.ice and clutter t,%eK e9am%le -or &er.ice A

8 #okia has modified the -ormula introducing the MD< Macro Di.ersit, ain

(reduced the !"#o re'uirements)* MD di--erent %er clutter t,%e not %er ser.ice

8 Acti.it, -actors1 $rthogonalit, and Little i are in%ut %arameters gi.en !, o%erator or

#okia de-ault* !"#o .alues are #okia internal .alues

8 ,he issue is the 'al'ulation of N A (Number of user per cell of service A, per

clutter type)

( )[ ] j N

j j

jOb

j DL i RW

N E +⋅⋅=∑ = j1 -1

)/(α υ η

[ ]( )[ ]

ii

s Assumption

i RW

MDG N E N

A

A

A

AOb A A

==

+⋅−

⋅⋅

;

:

-1)/(

A

A

α α

α υ


6/13

8 N A is defined as the No. of phy. channels/TRX for Serivce A

8 Different calculations for S an! "S Services

8 S Services (#oice $%.%A&R, S$'.', S',.)

8 "S Services ("S$*bps, "S'*bps, "S$%+*bps, "S+'*bps)

8 ase S Service A-

DL Inter-erence Margin 6 @ (-or each clutter t,%e)

( ) [ ]

perSub AeClutterTyp A

iServiceCS

i

iServiceCS

i

A A

Erl ASubscriber Erl

eClutterTypTRX Cells

Erl

GOS Erlan!O" S#O

Erl

Erl N

_

_ _

_ _

#

1

_ )(#

,%)2( _ 1

⋅=

+

⋅+⋅=

∑

∑

total .oiceC& tra--ic rl"0RH

(Offered CS Traffic)

#o* o- tch"0RH @? o&


7/13

8 ase "S Service

8 N is defined as the No. of phy. channels/TRX for Serivce

DL Inter-erence Margin 6 (-or each clutter t,%e)

( ) $actor T%rou%put ReClutterTypTRX Cells

&bitps !Subscriber O" S#O N

!

perSub !eClutterTyp

! ⋅⋅⋅

⋅+=) _ )((#

# _ 1

_

#o* o- tch"0RH -or /& data tra--ic o- &er.ice B


8/13

UL Inter-erence Margin 6 7 (-or each clutter t,%e)

8 UL Inter-erence Margin E>*7 J Fractional Loads (linear .alues)

8 Fractional Load is calculated %er ser.ice and clutter t,%eK e9am%le -or &er.ice A

8 Acti.it, -actors and Little i are in%ut %arameters gi.en !, o%erator or #okia de-ault*

!"#o .alues are #okia internal .alues

8 ,he issue is the 'al'ulation of N A (Number of user per cell of service A, per

clutter type)

[ ] j N

j j

jOb

j'L i RW

N E +⋅⋅=∑ = 1

)/(

1υ η

[ ][ ]

ii s Assumption

i RW

N E N

A

A

A

AOb A A

=

+⋅⋅⋅

:

1)/(

υ


9/13

8 N A is defined as the No. of phy. channels/TRX for Serivce A

8 Different calculations for S an! "S Services

8 S Services (#oice $%.%A&R, S$'.', S',.)

8 "S Services ("S$*bps, "S'*bps, "S$%+*bps, "S+'*bps)

8 ase S Service A-

UL Inter-erence Margin 6 @ (-or each clutter t,%e)

[ ]

perSub AeClutterTyp A

iServiceCS

i

iServiceCS

i

A A

Erl ASubscriber Erl

eClutterTypTRX Cells

Erl

GOS Erlan!

Erl

Erl N

_

_ _

_ _

#

1

_ )(#

,%)2(

⋅=

+

⋅=

∑

∑

total .oiceC& tra--ic rl"0RH

(Offered CS Traffic)

#o* o- tch"0RH @? o&


10/13

8 ase "S Service

8 N is defined as the No. of phy. channels/TRX for Serivce

UL Inter-erence Margin 6 (-or each clutter t,%e)

$actor T%rou%put ReClutterTypTRX Cells

&bitps !Subscriber N

!

perSub !eClutterTyp

! ⋅⋅⋅=

) _ )((#

# _

#o* o- tch"0RH -or /& data tra--ic o- &er.ice B


11/13

Calculation o- A.erage #um!er o- 2ardware Channels %er #odeB

(-or each clutter t,%e)

( ){ }

Kbps400TRX perThruoghput! " _

Kbps400TRX perThruoghput! 1 _

_ # _ _ _

/

/

/1/

≤=

>=

+⋅= ∑ =

DL'L

DL'L

DL'L

N

Service Service DL'L

C%Sinallin

C%Sinallin

C%Sinallin SectorsC% #W C% #W Tot

8 alculation is performe! separately for D an! 0.

8 The hi1her number is ta2en as reference (usually is base! on the D traffic

!istribution !ue to the asymmetric characteristics

8 No2ia 3S" ar! contains ' hannel 4lements

8 The scope of the calculation is the re5uire! number of 3S" car!s per No!e8 ;3ample7 CS Ser$i'e A

[ ]

1 _

4 _

1 _

_ ) _ 1(# _ #

1 _ #

,%)2(

_

$"4

12"4

)1(212

_ _

_ _

)(

=

=

=

⋅

+⋅

⋅

+

⋅=

−


12/13

8 Case PS Ser$i'e B



( )

1 _

4 _

1 _

_ ) _ )((#

# _ 1 _

$"4

12"4

)1(212

_

)(

=

=

=

⋅

⋅⋅

⋅⋅+=

−


13/13



{ }

{ }[ ]

=

=≤

4

_ _ , _ _ &'r*+#ese

1&'r*+#4 _ _ , _ _

DL'L

DL'L

C% #W Tot C% #W Tot Ma+ Roun)'*

t%enC% #W Tot C% #W Tot Ma+ ,-

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3G Radio Dimensioning