PRESENTATION ON INSTALLATION OF A NEW BTS SITE UNDER GUIDANCE OF

BTS SITE INSTALLATION INVOLVE MANY STAGES

STAGE1RF SURVEY OF BTS SITE PURPOSE-To uncertain the feasibility of a new site within given configuration of data. AIM-To verify LOS clearance and link status.

METHODOLOGYDIFFERENT TOOLS USED :y BINOCULAR y GPS y MULTIMETER y MEASURING TAPE y MAGNETIC COMPASS

AVAILABILITY OF INFRASTRUCTUREBTS y Space y Type of site-indoor or outdoor y Check Availability ofy DIESEL GENERATOR y SMPS,BATTERY y MCB y EGB & IGB

CONT.TOWER y Availability of Pole Mount. y Availability of space on the tower for your GSM and Pole Mount required AZIMUTH. y Availability of Microwave Pole Mount. y Availability of Horizontal tray For feeder to go through its support.

CONT.FAR END y Visit the other end. y Check the space availability of microwave at the given height. y Availability of FIU/ MUXing Port (RF Link) MEASUREMENT y Location mark on the tower for GSM and RF antenna. y Length from antenna to BTS. y Certify LOS clearance

ENGINEER S REPORTy y y y y y y

y

Site Id-1233 Link Id-Link 1233 Site I (Near end) Latitude 28degree38'5.34"N Longitude077degree04'50.75" E Site II (Far End) Latitude 28degree38'1.94N Longitude 077degree04'35.11"E It is a newly installed site. Site is a RTT where building height is 10m and tower height is 25m. It has a horizontal tray of 4m.

CONT.y 3 GSM pole mount are installed to correct Azimuth.

*Beta sector pole mount need to be risen by 1m.y Further, Far end pole mount which is at 210degree

needs to be shifted in proximity of 75degree. y LOS has been observed and found clear. *In general site is suitable for creation of new cell site

STAGE2INSTALLATIONTHREE STAGES INCORPORATES GSM INSTALLATION 2. RF INSTALLATION 3. NETWORKING1.

MODULES REQUIREDAccording to configuration y GSM antenna(4) y MICROWAVE antenna(2) y Duplexer(3) y trans receivers(TRx)(06) (for configuration of 4+3+3 then 6TRx(FLEXI), 3duplexers, 1 power supply,1 control unit, 1 mux unit is required) y Krawn for hardware patching of alarms y Krawn panel for E1 patching y DDF(Data Distribution Feeder) panel y Cables acc. to configuration. E.g. Feeder of 7/8 thickness y Feeder jumpers (min 3 jumpers required) and thickness is y Grouting nuts y Earthing assembly(18 Feeder earth,02 for IF earth)

GSM INSTALLATIONy PURPOSE-TO INSTALL THE

GSM NETWORK ACCORDING TO THE OPERATORS SPECIFICATION DATA. y AIM- SETTING UP OF GSM NETWORK MAKING OPTIMUM USE OF THE MATERIAL AND EQUIPMENTS. y METHODOLOGY-INSTALL THE GSM ANTENNA TO THE RESPECTIVE POLE MOUNTS MAKING USE OF ROPE AND PULLEY.

FEEDER INSTALLATIONFEEDER LENGTH-tower height +horizontal tray length +internal feeder length + loop area at the tower(4m) 22+9+1+4 =36 * 8 =288 M Alpha leg- Alpha main and Alpha diversity

Make S bend ensure angle should be less than 45 at any place

EARTHING DIAGRAM

BTS INSTALLATION

RF INSTALLATIONPURPOSE-TO INSTALL THE RF LINK ACCORDING TO THE OPERATORS SPECIFICATION DATA. AIM- SETTING UP OF RF LINK MAKING OPTIMUM USE OF THE MATERIAL AND EQUIPMENTS. METHODOLOGY- INSTALL THE RF ANTENNA TO THE RESPECTIVE POLE MOUNTS MAKING USE OF ROPE AND PULLEY.

MICROWAVE DIAGRAM

CONT.y Connect the IF cable at

radio unit and other end at RF port at BTS/MUX. y Connect the IF earthing at both end

CONT.y Ensure proper connection by carrying out visual check . Switch on the BTS. y Using LAN cable login to the BTS. Make sure IP address is correct and as per the NOKIA equipment configuration. y Open NOKIA FLEXI HOPPER MANAGER software access the radio unit.

CONT.y y y y

y y y y y

Keep interleave status off. Feed 14 dbm transmit power. Check the status on the screen. Using LAN cable login at Far end BTS. Make sure IP address is correct and as per the NOKIA equipment configuration. ACCESS THE RF PORT WHICH IS BEING UTILIZED FOR LINK ONLY. Open NOKIA FLEXI HOPPER MANAGER software access the radio unit FEED the frequency 15.2325GHZ Select four stage modulation. Keep interleave status off. Feed 14 dbm transmit power.

CONT.y Check the status on the screen. y Check AGC voltage at both OUTDOOR RADIO UNIT

Near end and Far end ,should be more than +3.5V DC

CONT.y Start coarse alignment . y With the help of positional nuts carry out the coarse alignment.AGC voltage should start decreasing as RxL increases. At the level of 41dbm AGC level is +1.25v dc

CONT.y Carry out fine

tuning with the help of fine tuning nuts y With the help vertical and horizontal level has been increased by 3db.AGC voltage has come down to 1.18V dc.

CONT.

y Finally lock the both microwave antennas, ensure that

receive level is maintained.

NETWORKINGy PURPOSE-TO LINK THE NEW SITE TO THE

EXISTING IDEA NETWORKy AIM-ADDING NEW SITE TO THE IDEA NETWORK

USING HARDWARE AND SOFTWARE PATCHING.y METHODOLOGY- INSTALL THE PATCH PANEL &

EXTEND PHYSICAL CONNECTIONS TO THE PATCH PANEL WITH THE HELP OF PHYSICAL CAT 6 CABLE.

CONT.

CONT.y Then make cross connection using software at far end

NOW COMMISSION THE SITE

CONT.y We get OMU signal. y Put the site on loading and this procedure takes

around 45 min y Unlock the site from OMCR for call testing y Link is established.

NOW THE SITE IS ON AIR

CONT.

y Above picture shows 3 subscribers are connected to the IDEA network

(making or receiving calls).In sector1 on the main trans path utilizing channel 5,6,7.

TESTINGy PURPOSE- TESTING THE LINK FOR OPTIMUM

LINK PERFORMANCEy AIM-ENSURE MAXIMUM AVAILABILITY OF

CHANNELS AVOIDING UNWANTED HANDING OVER OF CALLS FROM ONE SECTOR TO OTHER SECTOR DUE TO HIGH VSWR

METHODOLOGYy METHODOLOGY- TESTING IS CARRIED OUT IN

TWO MAJOR STEPS: VSWR measurement of each sector in the main and diversity part discretely 2. Receiver signal strength index measurement1.

VSWR MEASUREMENTPURPOSE- CARRY OUT VSWR MEASUREMENT IN EACH SECTOR MAIN AND DIVERSITY PATH DISCRETELYy Effect of VSWR- High VSWR will result into: 1. Low/reduced coverage area 2. Unwanted call handing over from main path to

diversity path or one sector to another sector 3. Reduced equipment life

CONT.

EQUIPMENT REQUIREDy Bird site master y Calibration tool y Male/female connector y Jumpers y Power measurement sensors y Power measurement load(50Watt forward power and

5watt reversed power) y D-9 pin cable(male/female) y C-spanner 30/32

METHODOLOGYy y y y y y y y y y

Login the BTS using LAN cable Access the BTS hardware Disable the sector(for which VSWR is carried out) Green LED indication of TRx will turned into Amber light Remove the feeder jumper from corresponding duplexer port Calibrate the site master for the required frequency range(880 to 960 MHz) Connect the feeder jumper to the site master Carry out VSWR measurement VSWR for each sector/antenna port should be less than specified limit(1.3) Carry out same procedure for all the sectors

VSWR GRAPHVSWR GRAPH OF DIFFERENT SECTORS INCLUDE: y ALPHA( ) SECTOR y BETA( ) SECTOR y GAMMA( ) SECTOR EACH SECTOR INCLUDE TWO VSWR GRAPH i.e. MAIN AND DIVERSITY

ALPHA( 1)

ALPHA( 2)

BETA( 1)

BETA( 2)

GAMMA( 1)

GAMMA( 2)

POWER MEASUREMENTy Remove the jumper from site master y Connect the outbound jumper(towards antenna end )

at output port(output port must be engaged with 50watt load attenuator) y Connect the inbound jumper(towards TRx) at input port(input port must be engaged with the 5watt load attenuator for reversed power measurement)

CONT.y Connect the sensor port

to the site master with the help of D-9 male/female connector cable y Forward power and reversed power should be within specification

RSSI MEASUREMENTy It is the measurement of receiver signal level at the TRx.

EFFECT OF RSSI :y Main and diversity transmission line should not differ by more than 3db receiver signal strength level. y If signal strength level exceeds more than 3db calls will be accumulated on better SNR transmission path(total load will be on one transmission path either main or diversity). y As a consequent one sector will be flooded with a call and other sector will not be entertaining the calls, thus reducing the efficiency to half

METHODOLOGYy Login the BTS y Go to supervisory mode y Opt for RSSI

measurement

LINK OPTIMIZATIONy Above measurement

shows the difference of 4(5dbm)which is not acceptable y After swapping the sectors , changing the mismatch RF cabling the result improved to 1

LINK IS OPTIMISED AND WORKINGTO ITS FULLEST CAPACITY