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WCDMA-Tamatave ORANGE Radio
Network Optimization
Author: Ricardo RAKOTONIAINA
Amar RAMKISSOON
NTS RNPO Department
Huawei Technologies Co., Ltd.
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Table of Contents
List of Tables ..................................................................................................................................... 3Chapter 1 Prediction & Drive Test Summary Report.....................................................................4
1.1 Coverage Prediction Summary: ............................................................................................ 41.1.1 Engineering parameters of Sites: ............................................................................... 41.1.2 Coverage Prediction by Best Signal Level: ................................................................5
1.2 Drive Test Report Summary..................................................................................................61.2.1 RSCP Active Set [dBm] .............................................................................................. 61.2.2 Tamatave 3G Network Statistic .................................................................................. 71.2.3 Application Throughput__DL [Kbps] ........................................................................... 71.2.4 Application Throughput Statistics ............................................................................... 8
Chapter 2 Optimization Scope for Tamatave 3G Network ............................................................92.1 Perform Neighbor relationship...............................................................................................92.2 Change Azimuth & Antenna Downtilt (mechanical or electrical).........................................11
Chapter 3 Network Analysis after Optimization...........................................................................123.1 Coverage Prediction by Best Signal Level: ......................................................................... 123.2 Drive Test Report Analysis:.................................................................................................12
3.2.1 RSCP Active Set [dBm] ............................................................................................ 123.2.2 Tamatave 3G Drive Test Statistic ............................................................................. 143.2.3 Application Throughput __DL [Kbps] ........................................................................143.2.4 Application Throughput Statistics after Optimization................................................16
3.3 Case Study: ......................................................................................................................... 173.3.1 Case 1:......................................................................................................................173.3.2 Case 2:......................................................................................................................173.3.3 Case 3:......................................................................................................................173.3.4 Case 4:......................................................................................................................173.3.5 Case 5:......................................................................................................................18
Chapter 4 Network parameter Optimization.................................................................................194.1 Network Global Parameter ..................................................................................................194.2 Cell level parameter.............................................................................................................20
Chapter 5 Conclusion and Recommendations ............................................................................ 215.1 Conclusion...........................................................................................................................215.2 Recommendations...............................................................................................................21
APPENDIX........................................................................................................................................22 A.1 Prediction Tool : ..................................................................................................................22A.2 DT Tool : ............................................................................................................................. 22
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List of Tables
Table 1-1 Tamatave Engineering Parameters.......................................................................................... 4Table 1-2 Tamatave Real Engineering Parameters ................................................................................. 6Table 1-3 Coverage Statistics .................................................................................................................. 7Table 2-1 Neighbor Relationship table..................................................................................................... 9Table 2-2 New Parameters Table............................................................................................................11Table 3-1 Coverage Statistics after Optimization ................................................................................... 14Table 4-1 RNC level parameters............................................................................................................ 19Table 4-2 CIO modification..................................................................................................................... 20
List of Figures
Figure 1-1 Coverage Prediction by Best Signal Level ................................................................................ 5Figure 1-2 RSCP of the Best Server........................................................................................................... 6Figure 1-3 Application Throughput Coverage (DL) ..................................................................................... 7Figure 1-4 Application Throughput_DL Histogram................................................................................... 8Figure 3-1 Coverage Prediction by Best Signal Level after Optimization................................................. 12Figure 3-2 Comparison between RSCP for 1
stBest in Active Set before & after Optimization ................ 13
Figure 3-3 Comparison between Application Throughput Coverage (DL) before & after Optimization.... 15Figure 3-4 Application Throughput _DL Histogram before & after OPTIMIZATION.............................. 16Figure 5-1 RRU blocking antenna movement .......................................................................................... 21
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Chapter 1 Prediction & Drive Test Summary Report
1.1 Coverage Prediction Summary:
1.1.1 Engineering parameters of Sites:
Sites Basic Parameters received from Orange engineering.
Table 1-1 Tamatave Engineering Parameters
Node B name Cell nameAzimuth
()
2G
Antenna
Height
(m)
3G
Antenna
Height
(m)
Antenna
Install type
Downtilt
mech () 2G
Downtilt
mech () 3G
N_TamataveAgence U_Tamatave Agence_1 30 14 14 Co- 0 0
N_TamataveAgence U_Tamatave Agence_2 150 14 14 Co- 0 0
N_TamataveAgence U_Tamatave Agence_3 270 14 14 Co- 0 0
N_Tanamakoa U_Tanamakoa_1 30 20.5 17 Separate 0 0
N_Tanamakoa U_Tanamakoa_2 150 20.5 17 Separate 0 0
N_Tanamakoa U_Tanamakoa_3 270 20.5 17 Separate 0 0
N_Anjoma U_Anjoma_1 45 18 18 Co- 0 0
N_Anjoma U_Anjoma_2 220 18 18 Co- 0 0
N_Anjoma U_Anjoma_3 300 18 18 Co- 0 0
N_Verrerie U_Verrerie_1 45 37.5 35 Separate 0 0
N_Verrerie U_Verrerie_2 220 37.5 35 Separate 0 0
N_Verrerie U_Verrerie_3 300 37.5 35 Separate 0 0
N_Betainomby U_Betainomby_2 250 47.5 47.5 Co- 0 0
N_Ampasimazava U_Ampasimazava_1 60 15 18 Separate 0 0
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1.1.2 Coverage Prediction by Best Signal Level:
The figure here after shows the coverage prediction about Tamatave 3G network.
Figure 1-1Coverage Prediction by Best Signal Level
Note:
Coverage plots are based on the data provided by Orange on 13th
August 2009.
The NodeB N_Tanamakoa not yet running due to lack of power.
Important:
Orange Optimization team have been working in the region for the 2G network, the coverage
might be different if the target sites were modified during the operations by Orange, specially for
the sites which use Co-antenna type (2G & 3G together), like as TamataveAgence Site or
Anjoma Site.
During the Single Site Verification process, it was seen that some of the engineering
parameters on the sites were not according to the data provided by Orange during the
implementation phase.
Below is the actual parameters on Site, the differences are highlighted in RED.
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Table 1-2 Tamatave Real Engineering Parameters
Node B name Cell nameAzimuth
()
2G
Antenna
Height
(m)
3G
Antenna
Height
(m)
Antenna
Install type
Downtilt
mech () 2G
Downtilt
mech () 3G
N_TamataveAgence U_Tamatave Agence_1 4014 14
Co-0
2N_TamataveAgence U_Tamatave Agence_2 80 14 14 Co- 0 4
N_TamataveAgence U_Tamatave Agence_3 260 14 14 Co- 0 6
N_Tanamakoa U_Tanamakoa_1 0 20.5 17 Separate 0 0
N_Tanamakoa U_Tanamakoa_2 110 20.5 17 Separate 0 0
N_Tanamakoa U_Tanamakoa_3 270 20.5 17 Separate 0 0
N_Anjoma U_Anjoma_1 45 18 18 Co- 0 4
N_Anjoma U_Anjoma_2 230 18 18 Co- 0 4
N_Anjoma U_Anjoma_3 320 18 18 Co- 0 4
N_Verrerie U_Verrerie_1 60 37.5 35 Separate 0 0
N_Verrerie U_Verrerie_2 240 37.5 35 Separate 0 0
N_Verrerie U_Verrerie_3 320 37.5 35 Separate 0 0
N_Betainomby U_Betainomby_2 250 47.5 47.5 Co- 0 0
N_Ampasimazava U_Ampasimazava_1 60 15 18 Separate 0 0
1.2 Drive Test Report Summary
1.2.1 RSCP Active Set [dBm]
The figure here after shows the RSCP Active Set level from the Drive Test
Figure 1-2RSCP of the Best Server
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1.2.2 Tamatave 3G Network Statistic
The Table here after shows Coverage Statistics of Tamatave 3G Network before Optimization
Table 1-3 Coverage Statistics
EcIo RSCP -65
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1.2.4 Application Throughput Statistics
Figure 1-4Application Throughput_DL Histogram
Signal degradation due to neighbor relations missing in some regions has caused the
throughput to decrease drastically (Mark in red) in figure 1-3.
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Chapter 2 Optimization Scope for Tamatave 3G
Network
The main targets of the Optimization operations performed in Tamatave were to provide a
continuous coverage for the region and to ensure that the average throughput rates for the region is
homogeneous and acceptable.
2.1 Perform Neighbor relationship
Table 2-1 Neighbor Relationship table
Cell Name CellID Number Neighbor Cell NameNeighbor
CellID
Distance
( m)
U_Ampasimazava_1 24051 6 U_Anjoma_1 24021 1030
U_Ampasimazava_1 24051 6 U_Tamatave Agence_1 24001 403
U_Ampasimazava_1 24051 6 U_Tamatave Agence_2 24002 403
U_Ampasimazava_1 24051 6 U_Tanamakoa_1 24011 1911
U_Ampasimazava_1 24051 6 U_Tanamakoa_2 24012 1911
U_Ampasimazava_1 24051 6 U_Verrerie_1 24031 3099
U_Anjoma_1 24021 8 U_Ampasimazava_1 24051 1030
U_Anjoma_1 24021 8 U_Anjoma_2 24022 0
U_Anjoma_1 24021 8 U_Anjoma_3 24023 0
U_Anjoma_1 24021 8 U_Tamatave Agence_1 24001 638
U_Anjoma_1 24021 8 U_Tamatave Agence_3 24003 638
U_Anjoma_1 24021 8 U_Tanamakoa_1 24011 1587
U_Anjoma_1 24021 8 U_Tanamakoa_2 24012 1587
U_Anjoma_1 24021 8 U_Verrerie_1 24031 2073
U_Anjoma_2 24022 6 U_Anjoma_1 24021 0
U_Anjoma_2 24022 6 U_Anjoma_3 24023 0
U_Anjoma_2 24022 6 U_Tamatave Agence_2 24002 638
U_Anjoma_2 24022 6 U_Tamatave Agence_3 24003 638
U_Anjoma_2 24022 6 U_Verrerie_1 24031 2073
U_Anjoma_2 24022 6 U_Verrerie_2 24032 2073
U_Anjoma_3 24023 5 U_Anjoma_1 24021 0
U_Anjoma_3 24023 5 U_Anjoma_2 24022 0
U_Anjoma_3 24023 5 U_Tanamakoa_2 24012 1587
U_Anjoma_3 24023 5 U_Tanamakoa_3 24013 1587
U_Anjoma_3 24023 5 U_Verrerie_1 24031 2073
U_Betainomby_2 24042 2 U_Verrerie_2 24032 3105
U_Betainomby_2 24042 2 U_Verrerie_3 24033 3105
U_Tamatave Agence_1 24001 6 U_Ampasimazava_1 24051 403
U_Tamatave Agence_1 24001 6 U_Anjoma_1 24021 638
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U_Tamatave Agence_1 24001 6 U_Tamatave Agence_2 24002 0
U_Tamatave Agence_1 24001 6 U_Tamatave Agence_3 24003 0
U_Tamatave Agence_1 24001 6 U_Tanamakoa_1 24011 1656
U_Tamatave Agence_1 24001 6 U_Tanamakoa_2 24012 1656
U_Tamatave Agence_2 24002 5 U_Ampasimazava_1 24051 403
U_Tamatave Agence_2 24002 5 U_Anjoma_2 24022 638
U_Tamatave Agence_2 24002 5 U_Tamatave Agence_1 24001 0
U_Tamatave Agence_2 24002 5 U_Tamatave Agence_3 24003 0
U_Tamatave Agence_2 24002 5 U_Tanamakoa_2 24012 1656
U_Tamatave Agence_3 24003 4 U_Anjoma_1 24021 638
U_Tamatave Agence_3 24003 4 U_Anjoma_2 24022 638
U_Tamatave Agence_3 24003 4 U_Tamatave Agence_1 24001 0
U_Tamatave Agence_3 24003 4 U_Tamatave Agence_2 24002 0
U_Tanamakoa_1 24011 6 U_Ampasimazava_1 24051 1911
U_Tanamakoa_1 24011 6 U_Anjoma_1 24021 1587
U_Tanamakoa_1 24011 6 U_Tamatave Agence_1 24001 1656
U_Tanamakoa_1 24011 6 U_Tanamakoa_2 24012 0
U_Tanamakoa_1 24011 6 U_Tanamakoa_3 24013 0
U_Tanamakoa_1 24011 6 U_Verrerie_1 24031 2721
U_Tanamakoa_2 24012 7 U_Ampasimazava_1 24051 1911
U_Tanamakoa_2 24012 7 U_Anjoma_1 24021 1587
U_Tanamakoa_2 24012 7 U_Anjoma_3 24023 1587
U_Tanamakoa_2 24012 7 U_Tamatave Agence_1 24001 1656
U_Tanamakoa_2 24012 7 U_Tamatave Agence_2 24002 1656
U_Tanamakoa_2 24012 7 U_Tanamakoa_1 24011 0
U_Tanamakoa_2 24012 7 U_Tanamakoa_3 24013 0
U_Tanamakoa_3 24013 5 U_Anjoma_3 24023 1587
U_Tanamakoa_3 24013 5 U_Tanamakoa_1 24011 0
U_Tanamakoa_3 24013 5 U_Tanamakoa_2 24012 0
U_Tanamakoa_3 24013 5 U_Verrerie_1 24031 2721
U_Tanamakoa_3 24013 5 U_Verrerie_3 24033 2721
U_Verrerie_1 24031 8 U_Ampasimazava_1 24051 3099
U_Verrerie_1 24031 8 U_Anjoma_1 24021 2073
U_Verrerie_1 24031 8 U_Anjoma_2 24022 2073
U_Verrerie_1 24031 8 U_Anjoma_3 24023 2073
U_Verrerie_1 24031 8 U_Tanamakoa_1 24011 2721
U_Verrerie_1 24031 8 U_Tanamakoa_3 24013 2721
U_Verrerie_1 24031 8 U_Verrerie_2 24032 0
U_Verrerie_1 24031 8 U_Verrerie_3 24033 0
U_Verrerie_2 24032 4 U_Anjoma_2 24022 2073
U_Verrerie_2 24032 4 U_Betainomby_2 24042 3105
U_Verrerie_2 24032 4 U_Verrerie_1 24031 0
U_Verrerie_2 24032 4 U_Verrerie_3 24033 0
U_Verrerie_3 24033 4 U_Betainomby_2 24042 3105
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U_Verrerie_3 24033 4 U_Tanamakoa_3 24013 2721
U_Verrerie_3 24033 4 U_Verrerie_1 24031 0
U_Verrerie_3 24033 4 U_Verrerie_2 24032 0
Legend:
Add missing Neighbor from Drive Test
Add Neighbor from prediction
2.2 Change Azimuth & Antenna Downtilt (mechanical orelectrical)
Changing parameters depend on Antenna Type,
For Co-Antenna type (2G & 3G together): only electrical Downtilt allowedFor Separate-Antenna type: azimuth & Downtilt allowed
Table 2-2 New Parameters Table
Site Cell Name New Azimuth Real Azimuth New Tilt Old Tilt
Ampasimazava U_Ampasimazava_1 80 60 1 0
Anjoma U_Anjoma_1 45 45 3 4
Anjoma U_Anjoma_2 220 230 2 4
Anjoma U_Anjoma_3 300 320 2 4
Betainomby U_Betainomby_2 250 250 0 0
TamataveAgence U_Tamatave Agence_1 40 40 2 2
TamataveAgence U_Tamatave Agence_2 80 80 4 4
TamataveAgence U_Tamatave Agence_3 260 260 2 6
Tanamakoa U_Tanamakoa_1 30 0 1 0
Tanamakoa U_Tanamakoa_2 140 110 0 0
Tanamakoa U_Tanamakoa_3 260 270 0 0
Verrerie U_Verrerie_1 40 60 2 0
Verrerie U_Verrerie_2 195 240 0 0
Verrerie U_Verrerie_3 290 320 0 0
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Chapter 3 Network Analysis after Optimization
3.1 Coverage Prediction by Best Signal Level:
Here after is the Coverage Prediction after Optimization.
Figure 3-1Coverage Prediction by Best Signal Level after Optimization.
3.2 Drive Test Report Analysis:
3.2.1 RSCP Active Set [dBm]
The figures below show the comparison between RSCP Active Set level from the Drive Test
before & after the Optimization
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BEFORE
AFTER
Figure 3-2Comparison between RSCP for 1st
Best in Active Set before & after Optimization
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3.2.2 Tamatave 3G Drive Test Statistic
The Table below shows Coverage Statistics of Tamatave 3G Network before & after
Optimization
BEFORE
EcIo RSCP -65
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BEFORE
AFTER
Figure 3-3Comparison between Application Throughput Coverage (DL) before & after
Optimization
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3.2.4 Application Throughput Statistics after Optimization
BEFORE
AFTER
Figure 3-4Application Throughput _DL Histogram before & after OPTIMIZATION
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By increasing the overall signal level and quality, the network quality for HSPA services has
improved greatly. Throughput levels above 2 Mbps have increased by about 5% and for
throughput above 1Mbps the service area has increased by about 13%.
3.3 Case Study:
3.3.1 Case 1:
The signal decrease because there are missing neighbor relation between N_Betainomby &
N_Verrerie. And so, the signal from U_Verrerie_3 is not very good along the main road (RN2),
indicated by A in figure 3-2.
Consequence: - HSDPA was interrupted because of Cell reselection.
- Ping pong Handover effect after adding the neighbor relation missing; this was due
to low signal of the best server.
Solutions: - Add neighbor relation missing
- Change azimuth of U_Verrerie_3 Antenna to perform the signal level along the main
road (RN2)
3.3.2 Case 2:
HSDPA service was interrupted because of poor dominance of the serving cell along the road,
indicated by B in figures 3-2 & 3-3, leading to frequent Handovers.
Solutions: Change antenna azimuth of U_Verrerie_1 & decrease the antenna Downtilt of
U_Anjoma_3 to improve the dominance along the main road
3.3.3 Case 3:
HSDPA service was interrupted because of missing 1st
Best Signal level in Active Set along the way,
indicated by C in figures 3-2 & 3-3.
Solutions: - Change antenna azimuth of U_Verrerie_2 & decrease the antenna Downtilt of
U_Anjoma_2 to perform the signal level along the main road.
- Add missing neighbor relation between N_Betainomby, N_Verrerie & N_Anjoma.
3.3.4 Case 4:
To have a good continuous coverage in the city, better to decrease the antenna Downtilt of
U_Anjoma_3.
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3.3.5 Case 5:
Ping pong Handover effect due to missing of a dominant SC in the region, indicated by E in figure
3-2.
It may affect the DL throughput on the region (especially around the Terminal Container Port &
Sherrit Administrative Base).
Solutions: - Change antenna azimuth of U_Ampasimazava_1 as way, the second lobe of this
antenna can cover the target region.
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Chapter 4 Network parameter Optimization
4.1 Network Global Parameter
Global parameter set based on RNC levels we have recommended to be modified are as in the
table below. For details about the recommended changes please see the column comments
Table 4-1 RNC level parameters
Parameter Name Actual New Comment
Intra-freq Measure Quantity
CPICH
EC/NO
CPICH
RSCP
Network signal quality is
very good; in such a case
the best is to measure the
RSCP, signal level,
compared to quality.
VP service 1A event relative
THD[0.5dB] 6 8
To prevent unnecessary
neighbor cells getting in theactive set, to control the
SHO of the network
CS non VP service 1A event
relative THD[0.5dB] 6 8
To prevent unnecessary
neighbor cells getting in the
active set, to control the
SHO of the network
PS service 1A event relative
threshold[0.5dB] 6 8
To prevent unnecessary
neighbor cells getting in the
active set, to control the
SHO of the network
1F event absolute EcNo
threshold[dB] -24 -18
Force HO procedure at a
signal level where services
are still possible.
1F event absolute RSCP
threshold[dBm] -112
Force HO procedure at a
signal level where services
are still possible.
1A hysteresis[0.5dB] 0 4 To avoid Ping Pong HO
1B hysteresis[0.5dB] 0 4 To avoid Ping Pong HO
Min quality THD for SHO[dB] -24 -18
Force HO procedure at a
signal level where services
are still possible.
1F event blind handover trigger
condition[dBm] -115 -112
Force HO procedure at a
signal level where services
are still possible.
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4.2 Cell level parameter
In order to improve some of the Handovers the CIO (Cell Individual Offset) are required to be
adjusted. Below is the list of neighbor pairs to be adjusted. The normal value is 0, we would
recommend 7. This parameter helps to move the border closer, hence will allow the HO to
happen earlier.
Table 4-2 CIO modification
Cell Name Cell ID N Cell Name N Cell ID Neighbor Type
U_Verrerie_1 24031 U_Verrerie_2 24032 Co-Site
U_Verrerie_1 24031 U_Verrerie_3 24033 Co-Site
U_Verrerie_1 24031 U_Anjoma_3 24023 Adjacent
U_Verrerie_2 24032 U_Anjoma_2 24022 Adjacent
U_Verrerie_2 24032 U_Betainomby_2 24042 Adjacent
U_Verrerie_3 24033 U_Betainomby_2 24042 Adjacent
The change is required for Verrerie coverage area a the areas where the HO happens are far
from the target sites.
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Chapter 5 Conclusion and Recommendations
5.1 Conclusion
The overall network coverage for the region was good, very little load on the network; hence the
major task was focused on improving the continuous coverage for the network. Because of very
little or no apparent loads on the network, no major problems were identified.
After the optimization, the overall network quality has improved along with HSPA service quality.
Since there was no clear indication of the hot spot areas or high traffic region, the overall
network quality improvement will benefit all the regions, no specific areas have been targeted.
5.2 Recommendations
For a better service delivery, a timely communication of any ongoing optimizations and changes
performed on the network would be very helpful to enhance the service quality.
As the network expands and the load increases, a close monitoring of the network KPI and
adequate parameter tuning must be undertaken to ensure no over utilization of system
resources and a good network quality.
For smooth operations on the RF systems during optimizations phases, the RRU must not be
installed to prevent movement of the antenna for any azimuth changes or mechanical tilting.
The picture below shows an example the RRU blocking the antenna.
Figure 5-1RRU blocking antenna movement
RRUs can be placed on the back of the antenna, if there is adequate space, or below the
antenna or on small poles next to the antenna poles.
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APPENDIX
A.1 Prediction Tool :
Genex U-Net V2.2 (HUAWEI Software Product)
Propagation Model : Okumura-Hata, Suburban
A.2 DT Tool :
Genex Probe V1.5 (HUAWEI Software Product)
UE test : E169E (USB modem), This modem support UMTS900, HSDPA only.
GPS GARMIN 60s.
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