04 Design Methodology

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4. Design Methodology


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2007 Comba Telecom, All Rights Reserved2

Design Workflow

Equipment Selection

Antenna Placement

Coverage Area

Estimation

Schematics

Link BudgetCalculation

Does the designmeet customers

requirement ?

Design Estimation

Complete

Verify Customers

Design Criteria

Y

N

Site Survey


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Design Criteria Example 2


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Site Survey

Bu i ld ing Informat ion Coverage Requ iremen t

Cable Rou t ing Info rmat ion

Equipment Locat ion Requ irement Electr ical Requ iremen t

E1/T1 Requ irement

Checklis t IBS01


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Site Survey


7/20 2007 Comba Telecom, All Rights Reserved7

System Design

Transm ission Test Equipm ent Select ion

Coverage A rea Est imat ion

Antenna Placement Schematics Diagram

Link Budget Analys is

Checklis t IBS02



System Design



Coverage Area Estimation



Antenna Placement

Carr ied out b ased o n the Coverage Area Estimation andTransm iss ion Test Data (if any)



Schematics



EIRP Table

ANTCoverage

TypeOutput Before

CombinerCombining

LossTotal Loss ANT Gain ANT Port ANT EIRP

Common

Area / Lift

900

MHz

(dBm)

1800

MHz

(dBm)

2100

MHz

(dBm)

GSM

900

DCS

1800

WCDM

A

2100

900

MHz

(dB)

1800

MHz

(dB)

2100

MHz

(dB)

900

MHz

(dBi)

1700-

2200

MHz

(dBi)

900

MHz

(dBm)

1800

MHz

(dBm)

2100

MHz

(dBm)

900

MHz

(dBm

)

1800

Mhz(

dBm)

2100

MHz

(dBm

)

ANT1-20F lift 38.45 38.45 33 0.6 0.6 0.6 25.8 27.5 28.1 2 4 12.6 11.0 4.9 14.6 15.0 8.9

ANT2-20F common area 38.45 38.45 33 0.6 0.6 0.6 26.3 28.1 28.7 2 4 12.2 10.3 4.4 14.2 14.3 8.4

ANT3-20F common area 38.45 38.45 33 0.6 0.6 0.6 26.7 28.4 29.1 2 4 11.8 10.0 3.9 13.8 14.0 7.9

ANT4-20F lift 38.45 38.45 33 0.6 0.6 0.6 32.5 34.2 34.7 2 4 6.0 4.3 -1.7 8.0 8.3 2.3

ANT5-20F common area 38.45 38.45 33 0.6 0.6 0.6 26.6 28.3 28.9 2 4 11.9 10.2 4.1 13.9 14.2 8.1

ANT6-20F common area 38.45 38.45 33 0.6 0.6 0.6 26.3 28.1 28.7 2 4 12.2 10.3 4.4 14.2 14.3 8.4

ANT7-20F lift 38.45 38.45 33 0.6 0.6 0.6 25.8 27.5 28.1 2 4 12.6 11.0 4.9 14.6 15.0 8.9

ANT1-19F common area 38.45 38.45 33 0.6 0.6 0.6 27.8 29.4 29.9 2 4 10.6 9.0 3.1 12.6 13.0 7.1

ANT2-19F lift 38.45 38.45 33 0.6 0.6 0.6 28.6 30.6 31.2 2 4 9.8 7.9 1.8 11.8 11.9 5.8

ANT3-19F common area 38.45 38.45 33 0.6 0.6 0.6 27.9 29.6 30.1 2 4 10.5 8.8 2.9 12.5 12.8 6.9

ANT4-19F common area 38.45 38.45 33 0.6 0.6 0.6 28.2 29.9 30.4 2 4 10.3 8.5 2.6 12.3 12.5 6.6



ANT PL(d0) d n10n

log(d/d0)Lw LNF Rx Level Design Level

Excess

Margin

900

MHz

(dB)

1800

MHz

(dB)

2100

MHz

(dB)

(m) (dB)

900

MHz

(dB)

1800

MHz

(dB)

2100

MHz

(dB)

(dB)

900

MHz

(dB)

1800

MHz

(dB)

2100

MHz

(dB)

900

MHz

(dBm

)

1800

MHz

(dBm

)

2100

MHz

(dBm

)

900

MHz

(dB)

1800

MHz

(dB)

2100

MHz

(dB)

ANT1-20F 31.5 37.6 38.4 10.0 3.0 30.0 6 6 8 10 -62.9 -68.6 -77.5 -75.0 -75.0 -85.0 12.1 6.4 7.5

ANT2-20F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -65.7 -71.6 -80.4 -75.0 -75.0 -85.0 9.3 3.4 4.6

ANT3-20F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -66.1 -72.0 -80.8 -75.0 -75.0 -85.0 8.9 3.0 4.2

ANT4-20F 31.5 37.6 38.4 9.0 3.0 28.6 6 6 8 10 -68.1 -73.9 -82.7 -75.0 -75.0 -85.0 6.9 1.1 2.3

ANT5-20F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -66.0 -71.8 -80.7 -75.0 -75.0 -85.0 9.0 3.2 4.3

ANT6-20F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -65.7 -71.6 -80.4 -75.0 -75.0 -85.0 9.3 3.4 4.6

ANT7-20F 31.5 37.6 38.4 10.0 3.0 30.0 6 6 8 10 -62.9 -68.6 -77.5 -75.0 -75.0 -85.0 12.1 6.4 7.5

ANT1-19F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -67.2 -73.0 -81.7 -75.0 -75.0 -85.0 7.8 2.0 3.3ANT2-19F 31.5 37.6 38.4 10.0 3.0 30.0 6 6 8 10 -65.7 -71.7 -80.6 -75.0 -75.0 -85.0 9.3 3.3 4.4

ANT3-19F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -67.4 -73.1 -81.9 -75.0 -75.0 -85.0 7.6 1.9 3.1

ANT4-19F 31.5 37.6 38.4 12.0 3.0 32.4 6 6 8 10 -67.6 -73.5 -82.2 -75.0 -75.0 -85.0 7.4 1.5 2.8

EIRP Table (contd.)



Uplink Noise Figure Calculation



Uplink Link Budget Analysis


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Uplink Link Budget Analysis


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EMR Safety

ICNIRP standard has set 2 MPE lim its : Publ ic expos ure (unc ontro l led environment)

Occupat ional exposu re (con tro l led environment)610

510

410

310

100

10

0.1

1.0

01.0

2mW/cm

3 10 30 100 300 3 10 30 100 300 3 10 30 100 3001 1

kHz MHz GHz

E

H

Reference Levels

Time and Whole Body Averaged

f in MHZ

= Occupational

= General Public

100 /f 2

20/f 2

2 /ff / 2000

f /400


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ICNIRP MPE Standard

From the ICNIRP graph, the levels o f power dens ity fo r General

Publ ic are:

System Power Density

(mW/cm2)

Power Density

(W/m2)

GSM900 0.045 4.5

GSM1800 0.09 9.0

WCDMA2100 0.10 10


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Theoretical Safe Distance

The theoret ical m inim um safe distanc e for an N-carrier

transm it ter can be der ived from th e free space power densityexpression

Expressing in terms o f minimum safe distance

24 r

EIRPNPd

mP

EIRPNr

d

4


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Minimum Safe Distance

Minimum safe distance can be calculated b y u sing the highest

EIRP value of the antenna ob tained dur ing l in k bu dget

calculat ion,

For example, if the maximum EIRP is 11.4dBm and 8.1dBm for

GSM900 and UMTS2100 respectively , then:

System EIRP(dBm)

EIRP(mW)

N Pd(W/m2)

Safe Distance(m)

GSM900 11.4 13.8 4 4.5 0.031

WCDMA2100 8.1 6.5 2 10 0.010

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04 Design Methodology