ajeet gupta

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INSTALLATIONOF

BSS SITEs

GSM / CDMA

By: A N Singh-Master Trainer(TSSC)NSDC

GSM SYSTEM ARCHITECTURE

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MS BTS BSC MSC

HLR

VLR

EIR

AuC

OMC SMS

Um Abis A

MS Mobile Station.BTS Base Transceiver StationBSC Base Station Controller

MSC Mobile Services Switching Center.

HLR Home Location Register.

EIR Equipment Identity RegisterAuC Authentication Center.SMS Short Message Service.

VLR Visitor Location Register.

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GSM system architecture

CONTENTS

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• BTS SITE INFORMATION /REQUIRMENTS

• TYPES OF BTS SITE

• INITIALIZATION/RADIATION OF BTS

• BTS FREQUENCY AND POWER MANAGEMENT

• BTS TRAFFIC MANAGEMENT

• BTS ANTENNA , TOWER , SHELTER

• MOBILE STATION INFORMATION

BTS RACKS

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EMPTYRACK AND SUBRACK

MBI5

MBI3

TYPES OF BTS SITE• BSNL Site (GBT )

• Non BSNL Site (GBT /RTT )

• SHELTER SIZE

Interior Dimension -(3000 x 2000 x 2500)mm

Exterior Dimension -(3120 x 2120 x 2620)mm

Thickness of Puff - 60mm with metal sheet

•TOWER - GBT(40m & above)

- RTT ( 9m /12m/15m /18m/24m….)

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BTS TRAFFIC MANAGEMENT

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TRAFFIC MANAGEMENT THROUGH BTS CONFIGURATION

Different configurations of BTS are used according to site.

•Urban ( three sector) ( eg. 4.4.4 )

•Rural (single sector)

•Highway ( two sector)

NON- BSNL SITESHELTER, TOWER, ANTENNA ,FEEDER CABLE,CABLE TRAY…...

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SHELTER, TOWER & ANTENNA

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SHELTER, TOWER & ANTENNA

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SHELTERS

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TOWERS

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ROOF TOP TOWERS

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Smart Tower

BTS ANTENNAS

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• SECTORIAL / DIRECTIONAL

• OMNI

• WITH MULTIBAND

ANTENNA PARAMETERS(DIRECTIONAL):

- Azimuth (Horizontal beam )

- Tilt (Vertical beam)

Radiated PowerRadiation PatternBeam width Pattern Solid AngleDirectivityEfficiencyGain

ANTENNA MODESIn Omni Mode:Nodes receive signals with gain Go

In Directional Mode:Capable of beam forming in specified directionDirectional Gain Gd (Gd > Go)

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OMNI ANTENNA

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This medium gain omni directional antenna covers the GSM 900 and GSM1800 / UMTS bands. Its configuration is suitable for various GSM communications systems including3G/HSPA.

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Antenna Azimuth and Tilt

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Feeder & Jumper Cables

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Feeder & Jumper Cables

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Connectors & Adopters

INITIALIZATION / RADIATION OF BTS

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• BTS Assembly as per Configuration

• RF Cable Connections between cards/module

• Antenna Cable Connection

• Power on (DC)

• Connect Laptop with BTS (S/W loaded)

• Software Loading i.e. OFF line commissioning

• To radiate connect Abis link.

BTS FREQ AND POWER MANAGEMENT

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GSM BANDS :GSM 850 L

GSM 900 G

GSM 1800 D

GSM 1900 P

MULTIBAND 900/1800 & 900/1900 M PCS PERSONAL COMMUNICATION SYSTEM DCS DIGITAL COMMUNICATION SYSTEM

GSM 900 / GSM 1800

Channel Nos. 1 - 124 512 - 885ITI LTD. RAEBARELI 26

FREQUENCY REUSE IN CELLULARSame frequency reused in the network

Optimal use of a scarce resource : frequency

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EGSM / GSM 1900

PARAMETER EGSM GSM 1900Uplink band 880-915 MHz 1850-1910 MHzDownlink band 925-960 MHz 1930-1990 MHzDuplex spacing 45 MHz 80 MHzChannel spacing 0.2 MHz 0.2 MHzNo.of channels 175 299Channel Nos.

No. of time slots

975 – 1023 & 0 -124

8

512 – 810

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• Eight Power Classes • For Base Station.

• 320 W ( 55 dBm ) : Class I.• 160 W ( 52 dBm ) : Class II.• 80 W ( 49 dBm ) : Class III.• 40 W ( 46 dBm ) : Class IV.• 20 W ( 43 dBm ) : Class V.• 10 W ( 40 dBm ) : Class VI.• 5 W ( 37 dBm ) : Class VII.• 2.5 W ( 34 dBm ) : Class VIII.

Power Classes ( BS )

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END

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