Ljubljana Cluster1 Optimization Report

7/30/2019 Ljubljana Cluster1 Optimization Report

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All rights reserved © 2007, Alcatel-LucentSi.Mobil UMTS, October 2007

Alcatel-Lucent Team

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Cluster Optimisation ReportLjubljana Cluster1

Introduction Overview

Drive test routes

Status Before Optimisation

Scrambling Codes from Scanner RSCP from Scanner

EcIo from Scanner

EcNo from UE

Optimisation Performed

Main Issues

Explanation

Antenna Modifications Summary

Status After Optimisation Scrambling Codes from Scanner

RSCP from Scanner

EcIo from Scanner

EcNo from UE

Main Indicators Short Call AMR Statistics

Main Indicators Summary




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Introduction

This study consisted of:

Performing measurements on selected routes.

Analysing these measurements and process some statistics.

Measurement description:

The following equipment was used:

Couei X-CAL v3.1.2

Qualcomm T6275 mobile in car configuration

Anritsu ML8720B UMTS Scanner in outdoor configuration (external antenna)

The mobile configuration used for this report is:

AMR short call (2’ call + 1’ pauses) in car 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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Overview

This cluster is composed of 17 macro sites.

CLUSTER 1




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Drive Test Route

Comments :

The drive goes through each main road of the cluster and through each cell’s area of service.




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Results

Network StatusBefore the Optimisation




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Results:Scrambling Codes from Scanner

Comments :

- no problem of cross feeders was found on cluster 1

- some zones have problems of best-servers

- some cells have large coverage and may interfere




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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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Results:EcIo from Scanner Outdoor

Comments :

Areas with low quality are revealed with this map.




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Results:EcNo from the mobile




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Remarks

Scrambling code analysis :

All sites were on air during the first drive.

Due to very low values of the initial antenna tilts, there are areas covered by a high number of

sectors. This produces a best server problem in this areas.

RSCP analysis :

The RSCP level is good in most of the areas. But, all the sectors had a very low initial tilt. A slight

decrease in the RSCP level is expected, as these sectors have to be down-tilted to reduce the

overshooting. A gain in the RSCP level can only be obtain by adding new sites.

EcIo analysis :

There are some cases of areas with bad EcIo. These areas must be investigated to see whether

he quality problems come from overshooting or lack of coverage.




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Network StatusOptimisation Performed




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Optimisation performed:Main issues

Red circles represent examples of areas with bad quality that need to be optimised.

Area1

Area2




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Optimisation performed: Area 1

The following optimisations were performed:

- down-tilt Mestni_Log_2: from 2o to 5o

- down-tilt Cerkev_Trnovo_2: from 0o to 2o

- down-tilt Semenarna_3: from 0o to 3o

- down-tilt Iskra_2: from 0o to 6o , azimuth from 120o to 140o

EcIo in area 1 before optimization EcIo in area 1 after optimization




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EcIo in area 2 before optimization EcIo in area 2 after optimization

The following optimisations were performed:

- up-tilt Kozarje_1: from 3o to 1o, azimuth from 20o to 0o

- down-tilt Iskra_3: from 0o to 6o

- down-tilt Posta_Trzaska _2: from 3o to 6o




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RSCP (SC 162) in area 1 before optimization RSCP (SC 162) in area 1 after optimization

RSCP (SC 163) in area 2 before optimization RSCP (SC 163) in area 2 after optimization




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Optimisation Performed: Antenna Modifications Summary

AZIMUTH TILT AZIMUTH TILT

"Podpec Sv. Ana" 48 70 8 70 8 0 0

"Podpec Sv. Ana" 49 260 8 260 8 0 0

"Podpec Sv. Ana" 50 350 8 350 8 0 0

"KPL Vic" 96 0 0 0 2 0 -2

"KPL Vic" 97 120 3 120 3 0 0"KPL Vic" 98 265 4 265 4 0 0

"Iskra PRINS" 155 60 3 60 3 0 0

"Iskra PRINS" 156 240 3 240 3 0 0

"Iskra PRINS" 157 335 3 335 3 0 0

"Kozarje" 158 20 3 0 1 20 2

"Kozarje" 159 100 3 100 4 0 -1

"Kozarje" 160 210 3 200 2 10 1

"Mladinska knjiga" 66 130 3 130 6 0 -3

"Mladinska knjiga" 67 200 3 200 4 0 -1

"Mladinska knjiga" 68 280 3 280 3 0 0

"Nama" 167 105 3 105 5 0 -2

"Nama" 168 240 3 240 6 0 -3

"Nama" 169 350 3 350 4 0 -1

"Stolnica" 84 20 3 20 3 0 0

"Stolnica" 85 120 3 120 3 0 0

"Stolnica" 86 210 3 210 3 0 0

"Iskra" 161 30 0 30 0 0 0

"Iskra" 162 120 0 140 6 -20 -6

"Iskra" 163 240 0 240 6 0 -6

"Cerkev Trnovo" 21 10 0 10 0 0 0

"Cerkev Trnovo" 22 180 0 180 2 0 -2

"Cerkev Trnovo" 23 285 0 285 1 0 -1

"GD Murgle" 24 190 3 180 4 10 -1

"GD Murgle" 25 270 3 270 3 0 0

"GD Murgle" 26 350 3 350 4 0 -1

NameDELTA

AZIMUTH

DELTA

TILTPSC

BEFORE AFTER




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Optimisation Performed: Antenna Modifications Summary

Comments :

Average electrical tilt:

- Before the optimisation: 2.68°

- After the optimisation: 3.80°

AZIMUTH TILT AZIMUTH TILT

"Omega Air" 87 60 3 60 3 0 0

"Omega Air" 88 180 3 180 5 0 -2

"Omega Air" 89 300 3 300 3 0 0

"Posta Trzaska" 42 130 3 130 6 0 -3

"Posta Trzaska" 43 250 3 230 6 20 -3"Posta Trzaska" 44 310 3 310 4 0 -1

"Dolgi Most" 114 0 3 0 4 0 -1

"Dolgi Most" 115 140 3 160 5 -20 -2

"Dolgi Most" 116 220 3 220 4 0 -1

"TVD Partizan" 69 30 3 30 4 0 -1

"TVD Partizan" 70 100 3 100 5 0 -2

"TVD Partizan" 71 180 3 180 2 0 1

"Srednja Elektro Vegova" 90 120 3 100 5 20 -2



"Semenarna" 184 60 0 60 0 0 0

"Semenarna" 185 150 0 150 0 0 0

"Semenarna" 186 300 0 300 3 0 -3

"Mestni log" 170 0 2 0 3 0 -1

"Mestni log" 171 110 2 110 5 0 -3

"Mestni log" 172 270 3 270 4 0 -1

DELTA

AZIMUTH

DELTA

TILTName PSC

BEFORE AFTER




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Results

Network Status After the Optimisation




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Results:Scrambling Codes from Scanner Outdoor

Comments :

Zones with multi-servers reduced compared to the first drive test.




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Results:RSCP from Scanner Outdoor




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Results:EcIo from Scanner Outdoor

Comments :

EcIo improved in all the cases considered for optimisation.




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Results:EcNo from the UE

Comments :

The EcNo improved after the optimisation. We can see on the map the zones whereproblems might happen (red points).




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Remarks

Scrambling Code Analysis :

All sites were on air during the final drive.

Most of the best server problems have been solved.

RSCP Analysis :

There are some areas with low RSCP level, especially the one west to Semenarna site, but this

is mainly due to lack of sites in these areas.

EcIo and EcNo Analysis :

The EcIo improved in the areas considered for optimisation. Very few zones remain with low

quality level; these zones are to be optimized further in the acceptance phase.




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Results

Network StatusMain Indicators




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Results:Short Call AMR

Statistics before optimisation :

Statistics after optimisation :

Nb of Setup Fail Nb of Drops CSSR CDR Nb of HHO Nb Attempts

4 7 94.20% 10.77% 2 69

Nb of Setup Fail Nb of Drops CSSR CDR Nb of HHO Nb Attempts

0 1 100% 1.41% 1 71



Results:Main Indicators Summary

Call Setup Success Rate analysis:

For the first drive:

-4 failures were found:

3 due to CM SERVICE REJECT sent by CN to the mobile 1 radio problem

For the last drive:

- No fail occurred due to radio problems in the last drive.

Call Drop Analysis after Investigation:


- 7 radio drops were found in the first drive.

For the last drive:

- 1 call drop occurred in the last drive.

HHO Analysis:


- 2 handovers to GSM occurred, triggered on bad RSCP criteria.

For the last drive:

- 1 handover to GSM occurred, triggered on bad RSCP criteria.

Documents

Ljubljana Cluster1 Optimization Report