ajeet gupta

ITI LTD. RAEBARELI 1


INSTALLATIONOF

BSS SITEs

GSM / CDMA

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

GSM SYSTEM ARCHITECTURE


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.


GSM system architecture

CONTENTS


• 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



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….)


BTS TRAFFIC MANAGEMENT


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…...



SHELTER, TOWER & ANTENNA


SHELTERS


TOWERS


ROOF TOP TOWERS


Smart Tower

BTS ANTENNAS


• 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)


OMNI ANTENNA


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.


Antenna Azimuth and Tilt


Feeder & Jumper Cables


Connectors & Adopters

INITIALIZATION / RADIATION OF BTS


• 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


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


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

8 ITI LTD. RAEBARELI 28

• 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 )


END


ajeet gupta

Engineering