Old Kaduna Cluster 1 Optimization Drive Test Report

Radio Network Optimization Acceptance Report for GLO WCDMA Project

RADIO NETWORK OPTIMIZATION

REPORT FOR WCDMA PROJECT

Cluster 1

(Kaduna)

Huawei Technologies Co., Ltd.

August, 2011. All rights reserved


Table of Contents

1 Introduction........................................................................................................................ 21.1 Test Tools.................................................................................................................21.2 Data collect Method...................................................................................................2

2 Summary........................................................................................................................... 32.1 Cluster Information and Test Route...........................................................................32.2 Site Information and SSV..........................................................................................42.3 Site distribution map:.................................................................................................5

3 RF Analysis and Comparison............................................................................................73.1.1 RSCP Coverage....................................................................................................7

3.2 Quality.....................................................................................................................113.2.1 Ec/Io Coverage....................................................................................................11

3.3 Cell Best SC Distribution.........................................................................................133.4 Pilot Pollution..........................................................................................................14

3.4.1. Pilot pollution...................................................................................................144 Call Analysis.................................................................................................................... 15

4.1 Short call access statistics (Sony Ericsson W995)..................................................154.2 Retainability Analysis (Short call)............................................................................18

5 Key Performance Indicators (KPIs)..................................................................................205.1 KPIs based on Drive Test........................................................................................20

6 Drive Test conclusion.......................................................................................................216.1Comments...................................................................................................................... 21

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1 Introduction

The statistical data shows present performance KPIs of cluster two before and after RF optimization.

In this report, the WCDMA RAN performance is described according to separate measures of RF

coverage, Accessibility and Retainability, using Huawei’s quality metrics and classifications.

This analysis was performed for Pre Optimization. Data is collected from WCDMA test UE.

1.1 Test Tools

Test instruments

Laptop, UE (Sony Ericsson W995), GPS (Globalsat GPS BU-353)

Test Data Collection Tool

TEMS Investigation Data Collection, Version 10.0.5

Post Processing Tool

Actix, TEMS Investigation Route Analysis Version 10.0.5, MapInfo Professional

1.2 Data collect Method

The method to collect data for the analysis is from drive test by testing each service.

Short Calls

A short voice call attempt is performed every 40 seconds, including 10 seconds of idle time between two

consecutive calls. This mobile is configured for IRAT handover.

HSDPA Packet Calls

A Packet Interactive Call is made to a FTP server to download files. The call shall remain active until the

file has been downloaded or the call is dropped. The RAB can transition through the various

R.99/HSDPA RAB connections. The FTP server is ftp://ftp.uninet.ee server.

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ftp://ftp.uninet.ee/


2 Summary

2.1 Cluster Information and Test Route

To have more facts about the network information and according to BTS distribution of the sites and

landform, we confirm test route around the sites. The area of this cluster and the test route is shown in

the figure below:

Test route for Cluster 1 Kaduna.

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2.2 Site Information and SSV

The following sites were on-air during the test of this cluster:

Site Name

Status

UKAD023 ON AIRUKAD095 ON AIR

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2.3 Site distribution map:

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2.4 Site Parameters

Site Name Cell ID PSCAntenna Height Azimuth Mech. Tilt Elect. Tilt

UKAD023 50231 5 28 0 0 2UKAD023 50232 13 28 120 0 2UKAD023 50233 21 28 240 0 2

UKAD095 50951 192 30 0 0 2UKAD095 50952 200 30 120 0 2UKAD095 50953 208 30 240 0 2

Total number of planned sites for the cluster is: 2

Percentage Sites Radiating: 100%

Comments: All the sites were up and running.

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3 RF Analysis and Comparison

3.1.1 RSCP Coverage

CPICH RSCP distribution shows the downlink coverage. Greater Pilot RSCP reflects better downlink

coverage.

Figure1: RSCP Distribution map

Figure 1 above shows the RSCP Coverage for the network before optimization. Bad areas marked “B,

C & D” was due distance from the serving sector. The Areas “A” need 2 degree electrical down tilt at

site UKAD023B to improve the coverage in the area.

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D

C

A

B


Fig. 2 UE-CPICH Pilot RSCP Distribution

The CPICH pilot points greater than -95dBm is analyzed as 70% as shown in Fig.2, above.

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3.1.3 UE Tx Power Coverage

Fig.3 below also shows the UE-Tx power statistics recorded for Cluster 1 before Optimization which was

-100 to 0 dBm, indicating very strong Uplink coverage. The indexes of UE-TX power ≤ 10dBm was

measured as 84.1%.

Figure3: UE-Transmit Power Distribution map

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Fig. 4 UE-Transmit Power Distribution

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3.2 Quality

3.2.1 Ec/Io Coverage

CPICH pilot Ec/Io greater than -12dB before Optimization is represented as 95.6%, this is directly

related to the downlink coverage.

Fig. 5: UE-CPICH Pilot Ec/Io Coverage Map

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Fig. 6 UE-CPICH Pilot Ec/Io Distribution

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3.3 Cell Best SC Distribution

Scramble code (SC) distribution shows the coverage ability of every UMTS cell. In the figure below,

different colors represent different SC.

Figure 7: SC Distribution map

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3.4 Pilot Pollution

1.1.1.Pilot pollution

At each measurement point, the number of detected CPICHs that fulfill the condition

Ec/Nonth cell SC >= Ec/NoBest serving cell SC 5 dB AND RSCPnth cell SC >=-90 dB has been computed.

Figure 8 shows pilot pollution map. Pollution is recorded only in situations where the number of polluters

is greater than 3.

Figure 8: Pilot Pollution map

From the figure 8 above, it can be seen that the pilot pollution overhead is 0.1%, which is good.

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4.0 DATA ANALYSIS

Downlink App. Throughput Distribution before Optimization.

As the figure shown below, the downlink RLC Throughput samples are low, which was as a result of

poor coverage and transmission link failure.

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4 Call Analysis

4.1 Short call access statistics (Sony Ericsson W995)

RRC Setup Count 90RRC Setup Suc count 75RRC Setup Suc Ratio 82.9%Average setup time delay(s)RAB Setup SummaryRAB Setup Count 63RAB Setup Suc count 63RAB Setup Suc Ratio 100%Average RB setup time delay (s)Call Setup Success Rate; 100%

The RRC setup success ratio was 82.9%, and the RAB setup success ratio reached to 100%.

Figure 9: Call setup failure Analysis chart

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ANALYSIS & SOLUTION/RECOMMENDATION

Call setup failure 1:

The call block was as a result of limited service, improve coverage around UKAD023B

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Figure 10: Call setup failure Analysis

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4.2 Retainability Analysis (Short call)

Voice call statistics

Call Statistics Result RateTotal Number of Calls 68 100%Total Drops 0 0 %

Figure11: Call Drop Map

Figure 12 Call Drop Analysis chart

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5 Key Performance Indicators (KPIs)

5.1 KPIs based on Drive Test.

All KPIs are from short calls otherwise mentioned.

Drive test Based

3G Call Performance

Call Attempt (CS) 69

Attempt Failure (CS) 1

Attempt Failure Rate (CS) 1.45%

Good Initialization (CS) 68

Call Setup Success Rate (CS) 98.5%

Call Attempt (PS) 46

Attempt Failure (PS) 0

Attempt Failure Rate (PS) 0%

Good Initialization (PS) 46

Call Setup Success Rate (PS) 100%

Call Drop (CS) 0

Call Drop Rate (CS) 0%

Normal Termination (CS) 68

Call Retainability (CS) 100%

Call Drop (PS) 2

Call Drop Rate (PS) 4.3%

Normal Termination (PS) 44

Retainability (PS) 95.7%

3G Handover

Soft / Softer Handover Factor overhead 17.6%

Soft Handover Success Rate 100%

CS Inter-RAT Handover Success Rate( from UTRAN to GSM)

PS Inter-RAT Handover Success Rate( from UTRAN to GSM)

INTEGRITY

UL BLER (Speech) 2.21%

UL BLER (PS)

THROUGHPUT

PS 64 RAB

PS 128 RAB

PS 384 RAB

6 Drive Test conclusion Drive Test Data collected was analyzed so that problems can be located. After analyzing coverage

problems, Pilot pollution and handover problems, corresponding adjustment solutions were made to

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improve the coverage and quality of the network. From the above analysis and statistics, it can be

summarized that the coverage of Kaduna Cluster 1 don’t meets Acceptance Criteria.

.

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Documents

Old Kaduna Cluster 1 Optimization Drive Test Report