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7/30/2019 Cluster 2 Densif Optimization Report
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All rights reserved © 2007, Alcatel-LucentOrange UMTS, March 2007
Alcatel-Lucent Team
Page 1
Cluster Optimisation ReportBucharest Densification - Cluster 2
Introduction Overview
Drive test routes
Presentation of the Zone
Status Before Optimisation Scrambling Codes from Scanner
RSCP from Scanner
EcIo from Scanner
EcNo from Long Call UE Indoor
Optimisation Performed
Main Issues
Explanation
Antenna Modifications Summary Status After Optimisation
Scrambling Codes from Scanner
RSCP from Scanner
EcIo from Scanner
EcNo from Long Call UE Indoor
3G-2G Relationship
EcNo from Short Call UE Indoor 3G – 2G from Short Call UE Indoor
Main Indicators Short Call AMR Indoor Statistics
Main Indicators Summary
RNO Indicators
City Exits
Conclusions
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Cluster 2 Introduction
This study consisted of:
Performing measurements on selected routes.
Analysing these measurements and process some statistics.
Measurement description:
The following equipment was used:
Agilent E6474A (NITRO) V9.3
Mobile: Qualcomm T6275 in indoor daylight configuration (15 dB applied)
Agilent E6455C UMTS receiver (scanner) in outdoor configuration (external antenna)
The mobile configuration used for this report is:
AMR long call in indoor daylight with UE 3G locked.
AMR short call (2’ call + 40” pauses) in indoor daylight with UE in automatic mode.
The scanner has been connected in outdoor configuration for each drive.
All the sites were in commercial traffic during the optimisation.
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Cluster 2:Overview
Note: new sites are marked in red
Cluster 2 is composed of 8 old sites (all macro) and 11 new sites (10 macro + 1 micro). It’s
neighbours are clusters 1,3,5, and 6.
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Cluster 2:Drive Test Route
Comments :
The drive goes through each main road of the cluster and through each cell’s area of service.
The total length of the test drive route is about 130 km.
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Cluster 2 Results
Network StatusBefore the Optimisation
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Cluster 2 Results:Scrambling Codes from Scanner
Comments :
- a problem of crossed feeders was found and fixed on site BU_185
- some zones have problems of best-servers
- some cells have large coverage and may interfere
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Cluster 2 Results:RSCP from Scanner
Comments :
There are zones with low coverage. Specific investigations need to be done in order to
avoid as much as possible having “exclusion zones”.
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Cluster 2 Results:RSCP from Scanner Distribution
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Cluster 2 Results:EcIo from Scanner Outdoor
Comments :
Areas with low quality are revealed with this map.
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Cluster 2 Results:EcIo from Scanner Distribution
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Cluster 2 Results:EcNo from the Long Call UE Indoor
Comments :
The map above presents the worst zones to optimiseze (red points).
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Cluster 2 Results:EcNo from the Long Call UE Distribution
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Cluster 2 Remarks
Scrambling code analysis :
All sites were on air during the first drive except BI0661.
There are areas with best server problems, especially around new sites and sites that were late
on the initial optimisation phase.
RSCP analysis :
The RSCP level improved a lot in this Cluster (former Cluster 5) by the adding of the new sites.
However some sectors will have to be down-tilted in order to achieve a acceptable balance
between good coverage and good signal quality.
EcIo and EcNo analysis :
EcIo from the Scanner should be the reference for the interference optimisation as the EcNo from
he UEs can be influenced by missing neighbours or abnormal phone behaviour.
After the first drive Cluster 2 presented an overall good EcIo. Still areas exist with low EcIo level
mostly due to best server problems. Those areas have been considered for further investigations.
EcNo level is not very good. In most cases it reflects the bad EcIo, but in other the low level is
due to missing neighbours.
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Cluster 2
Network StatusOptimisation Performed
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Optimisation performed:Main issues
Red circles represent areas of bad quality that need to be optimised.
12
3
4
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Optimisation performed: Area 1
Sectors BU_185_2, BU_185_3 and BU_121_3 were chosen to become best servers in this area.
All the other overshooting sectors were down-tilted. The following optimisations were performed:
up-tilt BU_185_2: from 4o
to 3o
up-tilt BU_185_3: from 5o to 3o
down-tilt BI_279_3: from 6o to 10o
down-tilt BI_661_1: from 2o to 7o
down-tilt BI_661_2: from 2o to 6o
down-tilt BU_201_2: from 6o to 10o and reduce it’s CPICH power by 5dB
down-tilt BU_448_1: from 3o to 7o
down-tilt BU_448_2: from 4o to 6o
The modifications produced the expected result and the EcIo improved a lot. Further improvementwould have been possible if sector BU_201_1 could have been down-tilted as well. This was not
possible however due to lost of coverage in other areas.
Case 1 EcIo Case 1 SC
Details:
This is an area with bad EcIo caused by the lack of a best server and the overshooting
neighbouring sites.
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Optimisation performed: Area 2
The following modifications were performed:
- down-tilt BU_595_3: from 6o to 8o (Cluster 5)
- down-tilt BU_683_3: from 4o to 7o (Cluster 5)
- down-tilt BU_369_3: from 9o to 10o
The bad quality problem was solved.
Case 2 EcIo Case 2 SC
Details:
BU_279_2 is the best server in this area, but it is interfered by overshooting sectors.
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Optimisation performed: Area 3
Sectors BU_144_3 and BI_550_3 were chosen to act as best servers. Several other
sectors were down-tilted:
- down-tilt BU_210_3: from 2o to 6o (Cluster 3)
- down-tilt BI_550_3: from 1o to 4o (Cluster 3)
- down-tilt BU_144_1: from 3o to 6o
- down-tilt BU_144_3: from 3o to 4o
- down-tilt BI_688_1: from 1o to 7o
- down-tilt BI_371_3: from 3o to 8o
After these modifications were made the quality improved a lot.
Case 3 EcIo Case 3 SC
Details:
This area dose not have a best server and interference is produced by overshooting sectors.
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Optimisation performed: Area 4
The following optimisations were performed:
- down-tilt BI_143_2: from 4o to 7o
- down-tilt BI_448_3: from 3o to 6o
- down-tilt BI_674_1: from 2o to 6o
- down-tilt BI_128_1: from 4o to 7o
- down-tilt BI_128_3: from 2o to 7o
- down-tilt BU_201_3: from 4o to 8o
- down-tilt BI_933_3: from 4o to 7o
- down-tilt BI_688_2: from 1o to 5o
- down-tilt BU_592_1: from 3o to 6o (Cluster 1)
- down-tilt BU_186_3: from 4o to 8o (Cluster 1)
The EcIo level improved after the optimisation.
Case 4 EcIo Case 4 SC
Details:
This area was initially covered by sector BI_448_3 with insufficient RSCP level. Sector BI_143_2
had to be added to improve coverage. Some overshooting sectors were down-tilted.
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Optimisation Performed: Antenna Modifications Summary (1)
SITE DATA BEFORE OPTIMISATION AFTER OPTIMISATION Sector Sector Name Electrical Tilt Azimuth Electrical Tilt Azimuth Comments
1 BI_0128_U_1 4 40 7 40 Case 4 2 BI_0128_U_2 4 160 8 160 3 BI_0128_U_3 2 280 7 280 Case 4 1 BI_0143_U_1 4 40 9 40 2 BI_0143_U_2 4 160 7 160 Case 4 3 BI_0143_U_3 2 280 4 280 1 BI_0279_U_1 7 40 7 40 2 BI_0279_U_2 7 155 7 155 3 BI_0279_U_3 6 270 10 270 Case 1 1 BI_0296_U_1 4 40 7 40 2 BI_0296_U_2 5 160 9 160 3 BI_0296_U_3 6 280 10 280 1 BI_0368_U_1 7 85 7 85 2 BI_0368_U_2 6 190 6 190 3 BI_0368_U_3 5 310 5 310 1 BI_0371_U_1 3 40 8 40 2 BI_0371_U_2 4 160 7 160 3 BI_0371_U_3 4 280 7 280 Case 3 1 BI_0661_U_1 2 40 7 40 Case 1 2 BI_0661_U_2 2 160 6 160 Case 1 3 BI_0661_U_3 2 280 5 280 1 BI_0674_U_1 2 50 6 50 Case 4 2 BI_0674_U_2 2 160 5 160 3 BI_0674_U_3 3 290 6 290 1 BI_0688_U_1 1 55 7 55 Case 3 2 BI_0688_U_2 3 160 6 160 Case 4 3 BI_0688_U_3 1 300 5 300 DN7 1 BI_0933_U_1 4 50 4 50 2 BI_0933_U_2 3 180 3 180 3 BI_0933_U_3 4 280 7 280 Case 4
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Optimisation Performed: Antenna Modifications Summary (2)
Comments :
Average electrical tilt on Cluster 2:
- Before the optimisation: 4.37°
- After the optimisation: 6.48°
1 BU_121_U_1 4 40 4 40 2 BU_121_U_2 8 170 6 170 3 BU_121_U_3 4 280 4 280 1 BU_144_U_1 3 45 6 45 Case 3 2 BU_144_U_2 4 160 7 160 3 BU_144_U_3 3 280 4 280 Case 3 1 BU_152_U_1 6 40 6 40 2 BU_152_U_2 5 160 5 160 3 BU_152_U_3 6 290 3 290 1 BU_163_U_1 7 30 7 30 2 BU_163_U_2 6 150 6 150 3 BU_163_U_3 7 270 7 270 1 BU_185_U_1 4 40 4 40 2 BU_185_U_2 4 160 3 160 Case 1 3 BU_185_U_3 5 280 3 280 Case 1 1 BU_201_U_1 2 40 3 40 2 BU_201_U_2 6 160 10 160 Case 1 3 BU_201_U_3 4 275 8 275 Case 4 1 BU_369_U_1 8 55 8 55 2 BU_369_U_2 8 160 8 160 3 BU_369_U_3 9 280 10 280 Case 2 1 BI_448_U_1 3 60 7 60 Case 1 2 BI_448_U_2 4 160 6 160 Case 1 3 BI_448_U_3 3 280 6 280 Case 4
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Cluster 2 Results
Network Status After the Optimisation
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Cluster 2 Results:Scrambling Codes from Scanner Outdoor
Comments :
Zones with multi-servers reduced compared to the first drive test.
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Cluster 2 Results:RSCP from Scanner Outdoor
Comments :
Even if some sectors had been down-tilted to improve the quality the RSCP level is
good in most areas.
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Cluster 2 Results:RSCP from Scanner Outdoor Distribution
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Cluster 2 Results:EcIo from Scanner Outdoor
Comments :
EcIo improved in all the cases considered for optimisation.
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Cluster 2 Results:EcIo from Scanner Outdoor Distribution
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Cluster 2 Results:EcNo from the Long Call UE Indoor
Comments :The EcNo improved after the optimisation. We can see on the map the zones where
problems might happen (red points).
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Cluster 2 Results:EcNo from the Long Call UE Distribution
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Cluster 2 Results:Remarks
Scrambling Code Analysis :
All sites were on air during the final drive.
Most of the best server problems have been solved.
RSCP Analysis :
Some sectors had to be down-tilted which led to a slight decrease in the RSCP level. Still the
RSCP level is sufficient all over the Cluster.
EcIo and EcNo Analysis :
The EcIo improved in the areas considered for optimisation. Very few zones remain with low
quality level.
The EcNo improved as well, but in at least two areas one of the UEs recorded a very bad EcNo
compared to the other UE or to the EcIo from the Scanner. This influenced the overall statistics.Some examples are given below:
Case 1: MS1 Case 1: MS2
Case 2: MS1 Case 2: MS2
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Cluster 2 Results
Network Status3G – 2G Relationship
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Cluster 2 Results:EcNo from Short Call UE Indoor
Comments :
We can see on this detailed map the zones where compress-mode (Event 2d_cm) andHHOs to GSM (Event 3a) might happen (black and red dots).
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Cluster 2 Results:3G-2G from Short Call UE Indoor
Results :
-4 3G-2G handovers during the final drive test (areas marked with green circles); one HHOwas not detected by Actix due to missing HO command message)
- in the area marked with a red circle MS2 lost the 3G signal unexpectedly due to a hardware
problem and initiated a call on the 2G layer (the quality recorded by both MS1 and theScanner is very good in that area, about -3dB)
- 95% of the drive was performed on the 3G layer
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Cluster 2 Results
Network StatusMain Indicators
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Cluster 2 Results:Short Call AMR Indoor with Load Statistics
Statistics before optimisation :
Statistics after optimisation :
No Setup
Fail
(Actix) No Drop
(Actix) No Setup
Fail real No Drop
real CSSR
real CSR
real CDR
real No
Attempts
2 5 3 0 96.84% 96.84% 0.00% 95
No Setup
Fail
(Actix) No Drop
(Actix) No Setup
Fail real No Drop
real CSSR
real CSR
real CDR
real No
Attempts
19 6 17 4 85.83% 82.50% 3.88% 120
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Cluster 2 Results:Main Indicators Summary
Call Setup Success Rate analysis:
Actix found 19 Access Failures for the first drive and 2 during the second but some of them are
wrong. Actix didn’t considered some real Access Failures but has counted some other. A detailed
analysis is given below:
For the first drive:
- 17 real failures were found:
• 2 due to radio problems
• 5 due to the “SignallingConnectionRelease” problem
• 7 due to problems with the test line (Requested Circuit Not Available)
• 2 due to network errors
• 1 due to “RRCConnectionReject” message with cause “Congestion”
- 6 fake failures found by Actix due to missing “Connect” messages
For the second drive:
- 2 fake fails found by Actix due to missing “Connect” messages
- 3 real fails due to network problems (not found by Actix)
No fail occurred due to radio problems.
Call Drop Analysis after Investigation:
For the first drive, Actix counted 6 call drops (only 4 turned out to be real due to radio causes).
For the second drive Actix found 5 drops. All of them were fake, 4 due to missing “Disconnect”
message and one due to missing HHO command message.
No real call drop occurred on the final drive.
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Cluster 2 Results:RNO Indicators
Daily_Call_Drop_IuCS_release
010
20
30
40
50
60
70
80
03/17/2007 03/18/2007 03/19/2007 03/20/2007 03/21/2007
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
QCDCIUCS_N
QCDCIUCS_R
03/17/2007 03/18/2007 03/19/2007 03/20/2007 03/21/2007 0.13 0.31 0.25 0.23 0.28
Daily IuCS Call Drop Rate from 17.03 to 21.03
Call Setup Success Rate
05
10152025
3035404550556065707580859095
100
03/17/2007 03/18/2007 03/19/2007 03/20/2007 03/21/2007
%
03/17/2007 03/18/2007 03/19/2007 03/20/2007 03/21/2007 RAB Setup Success Rate 99.10% 98.95% 98.37% 99.14% 99% RRC Setup Success Rate 97.64% 97.91% 97.27% 97.70% 73.46% Call Setup Success Rate 96.76% 96.88% 95.68% 96.85% 72.72%
Call Setup Success Rate (RAB Setup Success * RRC Setup Success) from 17.03 to 21.03
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Cluster 2 Results:City Exits
Two City Exits were considered for investigation in Cluster 2:
• DN1A to Mogosoaia
• DN7 to to Chitila
In both cases the call was successfully handed over to GSM at the edge of 3G coverage.
City Exit on DN1A City Exit on DN7
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Cluster 2 Results:Conclusions
Results:
The tables on previous pages show that the main indicators are good on Cluster 2.
The coverage on this Cluster improved a lot after this densification phase (11 new sites were
added). The RSCP level is very good at street level all over the cluster. Still, new sites may
be considered in the future to improve the deep indoor coverage needed especially for static
users which require high data rate services.The quality improved after the optimisation. In the very few places left with bad quality (blow
-12dB), the calls were successfully handed over to the GSM layer during the drive tests.
Call Drop Rate and Access Success Rate:
As seen from the drive test and the RNO exports the Call Drop and Call Access indicators
are good on this Cluster.
The Call Drop Rate during the final drive test was 0, while the RNO recorded a Drop Ratebelow 0.3% on IuCS after the final optimisations were completed.
3 Access Fails occurred on the final drive test, but these were not due to radio problems.
The Access Success Rate from the RNO (calculated as the RRC Connection Success
multiplied by the RAB Setup Success) is above 95%. The lower rate on 21.03 was due to
the fact that site BU_185 had a RRC Connection Success problem. This problem was
solved.
Main recommendations or task to work on:
This report concludes the Densification Phase of Cluster 2.
Further optimisation campaigns should be conducted on denser routes in order to fine tune
the antenna parameters on the sites even more.
RNO parameters should be observed in the future and modifications should be considered
on sites that will present lower KPIs.