wireless repeater commissioning

7/29/2019 Wireless Repeater Commissioning

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2011 Comba Telecom. All Rights Reserved

www.comba-telecom.com

Wireless Repeater

Commissioning


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STEPS

Select signal source

Test the isolation between donor antenna and service antenna

Adjust repeater downlink/uplink gain to obtain appropriate downlink output

power and minimum uplink interference

Set the monitoring parameters

Drive test

BTS

Repeater

UMTS
http://foma.nttdocomo.co.jp/english/term/d2101v_01.html


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SELECT SIGNAL SOURCE - GSM

The donor signal can couple from Macro BTS , Micro BTS or repeater.

Band selective repeater :

Input power of BCCH > Rated output power - 10lgN System gain

Channel selective repeater :

Input power of BCCH > Rated output power of channel System gain

C/I higher than 9dB

BCCH power > neighbor cells BCCH + 10dB

BCCH TCH TCH TCH

BCCH

TCH

Power

Capacity


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SELECT SIGNAL SOURCE - WCDMA

Band selective repeater :

Input power of each CPICH > rated output power - 10lgN - 10dBsystem gain.

Channel selective repeater :

Input power of CPICH > rated output power - 10dB system gain.

Ec/Io higher than -7dB.

Ec(CPICH)=10%

cch=10%

tch=80% Maximumpower=100%

Ec(CPICH)=10%

cch=10%Idlepower=20%


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OPERATING FREQUENCY CONFIG.

Bandwidth adjustable repeater:

set upper edge and the lower edge of the band.

Center frequency adjustable repeater:

set the center frequency of operating band.


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OPERATING FREQUENCY CONFIG.

Channel selective repeater:set channel numbers


7/19 2011 Comba Telecom. All Rights Reserved

Isolation(PT-PR) Gainmax+15dB

Use SiteMaster to test the isolation between Donor antenna and Serviceantenna

Or calculate the isolation according to path loss (Lw), gain of antennas (Gd, Gr),antenna front-to-rear ratios (Xd, Xr), separation between donor and serviceantenna (d), antenna wave length ().

Horizontal Isolation: Ih=22+20lg(d/-Gd+Gr+(Xd+Xr)+LwVertical Isolation: Iv=28+40lg(d/)+Lw

ISOLATION REQUIREMENTPath Loss LW

PR PT

G

P



Typical values

Note: Gd=Gr=15dB,Xd=Xr=25dB,

Lw=0,

f=900MHz

ISOLATION REQUIREMENT

d(m) 5 10 15 20 25 30

Ih(dB) 65.6 71.6 75.1 77.65 79.6 81.2

Iv(dB) 75 87.2 94 99.2 103.2 106.4



GAIN SETTING - DOWNLINK

Set DL ATT according to the DL input power and the target DL output power.



GAIN SETTING - DOWNLINKFor manually controlled repeater, user can set the ATT by DIP switch or

control panel



GAIN SETTING - UPLINKThe uplink noise level arriving from the repeater to the BTS

Nu = Nth-rr+ Grr+ NFrr- EDoPL

*Nth-rr = thermal noise of a GSM channel (-121 dBm @ 20C)Grr= uplink gain setting of repeater

NFrr= repeater noise figure (typ 5 to 9 dB)

To minimize noise interference at the BTS, let Nu be 3 dB less than thermalnoise of BTS, Nth-bts; i.e.

Nu = -(121+3) = -124 dBm

Assuming NFrr = 7 dB, the maximum repeater gain setting is determined byNu = Nth-rr + Grr + NFrr - EDoPL -124

= -121 + Grr + 7 - EDoPLGRULmax = EDoPL 10dB



GAIN SETTING - UPLINK

Set Uplink ATT according to EDoPL

Generally speaking, In applications of wireless repeater, we can setthe Uplink gain is 3~5dB less than Downlink gain.



MONITORING PARAMETERS

Alarm threshold:

Generally, these parameters have been pre-configured with default values,user can change the value according to the actual requirements




Site information setting:Set Site ID and Site Sub ID

Note: it is a must to set the site with unique Site ID for remotemonitoring


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Communication parameters configurationE.g. report phone number, OMC IP address, PS Domain parameters, etc.


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Alarm parameters


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DRIVE TEST

After finishing the commissioning, perform drive test to measure the coverage

improvement.

For GSM:

Rx Level

Rx Qual

TA

Tx Power C/I

FER

For WCDMA:

RSCP

EC/IO BER

Tx Power SIR target

Data rate


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CONTACT US

Email us at:

[email protected]

Or visit our website for local office details at:

http://www.comba-telecom.com
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Thank You

wireless repeater commissioning

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