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ITI LTD. RAEBARELI 1
ITI LTD. RAEBARELI 2
INSTALLATIONOF
BSS SITEs
GSM / CDMA
By: A N Singh-Master Trainer(TSSC)NSDC
GSM SYSTEM ARCHITECTURE
ITI LTD. RAEBARELI 2
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.
ITI LTD. RAEBARELI 4
GSM system architecture
CONTENTS
ITI LTD. RAEBARELI 5
• 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
ITI LTD. RAEBARELI 6
ITI LTD. RAEBARELI 7
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….)
ITI LTD. RAEBARELI 8
BTS TRAFFIC MANAGEMENT
ITI LTD. RAEBARELI 9
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…...
ITI LTD. RAEBARELI 10
ITI LTD. RAEBARELI 11
SHELTER, TOWER & ANTENNA
ITI LTD. RAEBARELI 12
SHELTER, TOWER & ANTENNA
ITI LTD. RAEBARELI 13
SHELTERS
ITI LTD. RAEBARELI 14
TOWERS
ITI LTD. RAEBARELI 15
ROOF TOP TOWERS
ITI LTD. RAEBARELI 16
Smart Tower
BTS ANTENNAS
ITI LTD. RAEBARELI 17
• 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)
ITI LTD. RAEBARELI 18
OMNI ANTENNA
ITI LTD. RAEBARELI 19
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.
ITI LTD. RAEBARELI 20
Antenna Azimuth and Tilt
ITI LTD. RAEBARELI 21
Feeder & Jumper Cables
ITI LTD. RAEBARELI 22
Feeder & Jumper Cables
ITI LTD. RAEBARELI 23
Connectors & Adopters
INITIALIZATION / RADIATION OF BTS
ITI LTD. RAEBARELI 24
• 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
ITI LTD. RAEBARELI 25
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
ITI LTD. RAEBARELI 27
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 )
ITI LTD. RAEBARELI 29
END
ITI LTD. RAEBARELI 30