Capacity Calculation on the basis of available RTCE

Suppose available RTCE on HW is 96 and active in SW 93. As per standard 30% are for SHO so the left out for voice calls are 65. GOS for voice is 2% so by using the Earlang B table we can find out the total voice subscriber capacity with 0.05 Ear/subs which is as follow

Total Earlang 54.38

Total voice subscribers 1087

But as matter of fact, one voice subscriber requires 1 RTCE so this capacity is true.

But when there are data subscribers as well then scenario gets changed. Suppose there are 10 data users at one time using 3 RTCE each. It means that 30 channels are occupied by data users leaving only 35 channels for voice. At this the total voice capacity would be

Total voice Earlang 26.43

Total voice subscribers 528

The markov FER refers to the ratio of the erasure frames to the total received frames. If the MS receives 12 (N2m) successive erasure frames, the MS will switch off the transmitter, but it still receives frames in the forward link. If two (N3m) successive good frames are received within 5 seconds (Fade Timer), the MS will restart the transmitter. Otherwise, the MS will be reinitialized.so Abis interface cause will be considered as a radio link cause. If the reverse power does not reach the maximum, but the FER in the reverse link increases. The symptom is usually caused by the fast fading. It shows there is no stable master pilot where the MS is locatedFor Power overload one measure could be, increase the handoff threshold of the congested cell and reduce the handoff threshold of adjacent cells ,the power reduction of the common channel can relieve the congestion on TCHCoverage of BTS should be considered on the basis of the reverse link whether MS can communicate to BTS or not.If the received pilot Ec/Io is good, and the MS transmit power is above 0, it can be decided that the forward coverage is greater than the reverse coverageThis is the so-called pilot pollution, that is, the number of pilots whose signal strength exceeds the specified threshold is greater than the number of Rake receivers.CW Values it is used to fine tune asset predictions- once all parameters (population per sq KM, no. of sites, indoor, in-car and outdoor signal strength) are given in the asset, it will provide the predictions. But these predictions will be hardly 65-70% accurate. To fine tune the values of asset predictions, extensive DT is carried out for particular site and then these DT values are compared with asset predictions. On the basis of this comparison all the values in asset are fine tuned and then get the predictions again, this will be around 75-80% accurate. These values obtained by DT and compared with asset are called CW values

After predictions, plan is forwarded to Site acquisition department who gets the proposed sites in the areas. For one particular site, three candidates are selected and SSR (Site survey report) is sent back to planning department. Planning department decides one site (by confirming which candidate is providing the best coverage) out of three and get the new prediction and TSSR (Technical site survey repot) is sent back to the acquisition department for the acquisition of that particular site.

The deployment starts.

If only population per sq KM and indoor , in-car and out door signal strength is given, then asset will decides itself the number of sites and proposed location. But practically this is not the case and numbers of sites are given by the operator to keep capex under control. Once the first phase is deployed and then new sites are deployed just on the basis of population specially in dense urban areas, then it will create the frequency planning and neighbor list issues after sometime due to ill-planned sites. To avoid this, it is better to divide the dense urban area in the grid of 500 meters and then deploy the sites (same methodology is adopted in telenor unlike mobilink who had to install thousands of indoor BTS to avoid so many handoffs due to the ill-planned BTS which created the problem of neighbor list). Vertical MapperDT data can be used to display in vertical mapper after making *.tab files (e.g. Rx, Tx, DRC rate, Rx throughput for EVDO). This information can be sown in vertical mapper in GRID

DT(make *.tab file in CNA( import in Mapinfo(then click New Browser to see table, then in Table(Maintenance->Table structure check if the table values in all columns is Character if it is so change it to FLOAT(check if in table value are in negative (to make EVDO graph in vertical mapper I did only use positive values(to remove negative values go to Query(Select and in table use table and in ASSIST coloumn type VALUE and expression will be value < 0 and in next two options selection and value(it will show all the negative values(delete them by delete button on key board(click New Browser again and it will show all the remaining positive values(open vertical mapper(create grid(Interpolation(Natural neighbour (advance)(Use cluster region(Slope (Hermitian smoothing)(it will make the grid(click show/hide grid manager(click color to check legend and modify it(Blue Marble utility can be installed and can be used with Mapinfo as GPS tool. When it will be installed, an folder gps will be created with tools folder in mapinfo and can be added in tools. This way we can use GPS in Mapinfo directlyPilot Panorama

It supports CDM, MDM and CAIT/ACTIX formats. Sometime if some CDM files are not working in ACTIX, it can be used in Pilot PanoramaFile(Open Project (new pan will be open in left side), select WGS-84 in Ellipsoid name and choose Decimal Long-Lat radio button(right click Test data and select New test data (pop window will be opened)(select file and COMMIT it and then APPEND (if you want to use multiple DT files then each time select file and commit and append it) after appending all the files dont use close option rather use X sign of the popped up window(click MAP(in popped up window click Coverage(in new popped up window select all the files and OK(by default it will show Ec/Io, it can be checked by clicking Map Legend (by clicking Change Grid other values link Rx, Tx can also be seen but one by one along with Ec/Io and some other analysis may also be done by using newly appeared tabs)(configure Item on Map and then right clicking on test data and cthen on ceoverage all the parameters can be observed(to make tab files and export in to mapinfo Data(data and then test data and then merge (it will merge all the loaded files in one file give this new file a name)(export (to MapInfo (window will be pooped up and here select which tables you need in the mapinfo link RxAGC, TxAGC, FFER, totalEc/Io) and then it will ask about the file from where data needs to be export. Select the merged file(it will make MIF file which can only be imported in MapInfo Table(Import it will make mapinfo tab fileHow to show information in Google earth from MapInfo directlyUse any of available map(in Layer option select what information required (e.g. Site name)(From Tools select Tool Manager and select Google Earth Connection Utility( This will provide in Map option with Google Earth link( select the area to be shown in Google Earth(open the option and select Export Selected Objects (KML)(Select the source of the Place name as Select second option and may be the place name(it will open the information in Google Earth (If it doesnt connect directly to Google Earth and gives error, dont worry. The KML file will be created in My Document folder, as path selected, click on it and the required file will be opened in Google Earth.)Site SeeHow to create map like one provided by jamil for ITR showing sectors and related information

Make a file with all information you required to show name, ID, Lat, Long, PN, azimuth, Tilt, etc in MS ExcelOpen this file in MapInfo and then open Tools(Tools manager(select Site See (if not being shown, add it using ADD utility)( Site See option will be available in Table as WFI Site See(Create Site Boundaries( Enter values in table( Latitude as Lat (as the heading of table), Longitude as Long, Radius as decided, Beamwidth 65 or according to antenna, in Orientation select AzimuthSpider Graph (MapInfo)

It is used to display some information graphically available in tabular form. Like if we need to show the graphical links of DRS available in table with Origin (Lat, Long) and destination (Lat, Long). We can put these origins and destinations in spider graph and it will show all the links graphically, available in the table.

Neighbor verificationSpider Graph

MCOM

NB_DISPLAY_HW / SHOW NEIGHBOR (with the help of MAPBASIC)GTOOLMapperNBR view

Plan Check

EVDO TestingHow to check U/L and D/L in any EVDO coverage area

Connect via EVDO connection

Open DOS (cmd)

Connect to ftp via command ftp 202.125.143.126

Login pdsn

Pwd pdsn

Use command hash to show activity

Then dir to check files on ftp server

get filename to download

put filename to upload

quit and exit to exit dos

BufferClip boundaries from maps to see each area/district sites then save as window in *.jpg format

VoronoiWith it, we can see the center point between two sites. Like if we load phase-II sites and use Voronoi (Table(Voronoi) it will show the center points among all sites. If theres any uncovered area, by using this, we can see which one is the nearest site to that area. Further by seeing the sectors of particular site it can be observed if BTS is facing in that uncovered area.

Create Points

If the information of LAT LONG is available in excel sheet, then this map can be created in MapInfo. Table(Create Point. If other information is available in excel then this can be displayed as well.

Interference How to find it and the procedure to followHow to decide if it is internal or external interference

Attach the analyzer with any of the feeder cable from BTS for reverse channel and check the waveform. If interference is there and been shown on the analyzer but no spikes are coming on the analyzer then it is definitely internal interference.

This is due to HW and feeders connectors, DUP/LNA/HPA cards need to be checked closely

Legitimate difference in Main and Average RSSI

Safe limit is 6-8 dB, 8dB is OK only if it is not repeated.

Difference in Main and Average RSSI is usually due to HW (DUP/LNA/HPA/loose connectors) & the strength of signal being received on both receiving antenna and sometime due to other mobile system within 5-10 meters distance.

Main RSSI range is from -116(-100 dB but ideally it should be -116(-114. We accept though up to -100 but standard is up to -108 dB.

In 1900 MHz system if RSSI remains constant on -106 then DRS needs to be checked in near location.

1. First of all check out the reports from BSC/OMC for the last one week to see if it comes on particular time period or can be observed all the time.2. If it comes on particular times then it is advisable to do activity in that time

3. Before starting the activity, take the RSSI in real time for the affected BTSs to make sure the affected BTSs/sectors or only carriers

4. Used Yagi antenna wit spectrum analyzer and scan the area to check where the interference comes or it shoots up

5. If you find any interference and able to locate to suspected network causing the interference (in Peshawar it was CATV), try to get them off and ask the engineer in OMC to check RSSI if they are OK or still affected. If the RSSI are OK ask the engineer to take screen shots and save them6. If there are other suspected networks (as in Peshawar, there were 8 operators and 3 of them causing interference), scan all the areas where the suspected network is operating and check them by getting them off and see the effect by observing the RSSI in OMC

Suspected networks on 1900 MHz1. DRS installed by PTCL2. Microwave links of mobile or WLL operators

To scan 1900 MHz, first keep the scanning span 1.25 MHz and then increase it to 5 M, 10 M and 50 MHz to see if any nearer channel is disturbing.In the area, where interference is being observed, check the installation of DRS and microwave links and go close to them to see, if the interference level is increasing.

Suspected networks on 450 MHz

1. CATV video signal span is 200-400 KHz and shape is of VSB (Vestigial Side Band) S39, S40 standards disturb the WLL signal. Allowable signal leakage for cable is 20V/meter.2. UHF links working in this band with span of 200-400 KHz

3. Sometime interference with span of 800-1000 KHz comes frequently with sharp spikes but this is due to vehicle engines passing by.

To scan 450 MHz, first keep the scanning span 1.25 MHz and then decrease it to 1M, 500K, 200 KHz. If still the interference cant be detected or the interference is detected but the shape of interference signal is not confirmed then adjust the interference frequency as the center frequency on the analyzer and see the shape.

HIRS BTS Racks/cards and distribution of resourcesCards(1234567

Shelf 1DUP , C1DUP/Combiner , C2DUP , C1DUP/Combiner ,C2DUP ,C1DUP/Combiner ,C2

Shelf 2HPA , C1HPA , C1HPA ,C1HPA , C2HPA ,C2HPA ,C2

Shelf 3

Shelf 4TXA , C1TXA , C1TXA ,C1TXA , C2TXA ,C2TXA ,C2

Shelf 5 (Baseband Shelf)

For Tx: E1(Baseband(TXA(HPA(DUP(Antenna

For Rx: Antenna(DUP(TXA(Baseband (CDSU)(E1If in Shelf 1, for one sector one card is DUP and second card is Combiner, then both carriers are being transmitted by DUP card and combiner is combining both carriers to be transmitted through DUP card. If both cards are DUP, then one carrier C1 is being transmitted by DUP at position 2 and second carrier C2 is being transmitted trough DUP card at position 3. Same configuration will be followed for other two sectors.For receiving the signal, in one sector first DUP card is for main diversity and second DUP card is for Average Diversity.In one BTS antenna housing, two antennas are installed for transmitting one carrier from each antenna but for receiving end both antennas receive both carriers. After changing cards in TXA shelf, if alarming still exists, check clock cable on the back panel.

Subsystem 2,3,4 means first carrier for all three sectors and subsystem 5,6,7 means second carrier for all three sectors (numeric values are card positions in HIRS for carriers)S(3, 3, 3) configuration in ZTE BTS

ZXC10 one cabinet can support only two carriers (S2,2,2) for all of three sectors because no space available for third carrier for all sectors. For this new ZXC10 rack has to be added. In this scenario, main rack will be having one DUP in position 2 and combiner at position 3 in first shelf and same for other two sectors. For 3rd carrier of each sector, three DUP cards will be added in new rack and connected to main rack through combiner. For transmitting the signal same configuration will be followed as of previous paragraph. But for receiving all main three carriers of one sector will be received at main rack (DUP) and all the three diversity of sector will be received at DUP card in new rack for same sector. Same methodology for other two sectorsHow to change APT (or ZRX) files into KMZ file:1) Open APT (or ZRX) file in CNA

2) From Phone Table, select any one parameter and open it New Table

3) In the Table Operation, Export to CSV

4) Save the CSV file in Excel worksheet format

5) Open the "Phone2GE" file and enable Macros.

6) From the just created new excel file, run the macro.

7) The KML file will be saved in C: root directory

8) After opening KML file in google earth, "Save as" file and select type as KMZ.