51010199 OWJ200101 WCDMA UTRAN Optimization Flow With Comment ISSUE1 0
Transcript of 51010199 OWJ200101 WCDMA UTRAN Optimization Flow With Comment ISSUE1 0
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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA UTRANOptimization
Flow
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Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Foreword
WCDMA optimization is a very important part in the
life of the network.
Mainly, the optimization contents the preparation,
single site verification, RF optimization, parameters
optimization.
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Page3Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
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Page4Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow
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Page5Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Introduction of OptimizationFlow
Customized Document:
Acceptance Report
Optimization Report
Site Configuration Parameter Table
Radio Part Parameter configuration Table
Process Document and Data:
Site configuration Parameter Table Radio part Parameter configuration Table
Output document:
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Page6Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
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Page7Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow -Preparation
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Page8Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
The Preparation for Projection
The following work is required:
Understanding of the Existing Network
Cluster Division and Optimization Team Establishment
Optimization Tools and Software
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Page9Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
The Preparation for Projection
Understanding of the Existing Network :
Radio Network Planning report
Latest site configuration parameter table and radio
part parameter configuration table
OMC statistic data and subscriber complaints of the
existing network
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Page10Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
The Preparation for the OptimizationProjection
Cluster Division and Optimization TeamEstablishment
RNO leader-1
Data Analyzer
Drive Test Operator
Driver
RNO leader-n
Data Analyzer
Drive Test Operator
Driver
..................
RNO manager
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Page11Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
The Preparation for Projection
Optimization Tool:
UMTS Scanner
UMTS Test UE
GPS and data
line
Digital camera
Optimization
Software:
Post processing
tool
MapInfo
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Page12Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
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Page13Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow Single SiteVerification
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Page14Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification
Purpose: The single site verification test is a part of the WCDMA network
optimization to ensure that the basic functions of the cell are
normal, such as call access, call quality, handover and so on.
Single site verification involves the following aspects:
Parameter setting check in idle mode
Services call (AMR/VP/PS) function check in connected mode
HSDPA function check
CPICH RSCP & Ec/Io
Installation problems check
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Page15Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification
Single site verification includes :
preparations before test
single site test
solving problems
The single site verification is completed by:
On-site engineers
RNO engineers
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Page16Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification - Taskof the on-site engineers Preparations Site Status Check
For each cell to be measured, check Status by LMT or M2000 Status
Configuration Data Collection and Check
check whether the data configured is consistent with the planned data
Testing Point Selection
Test UE Setup
Set the handset to testing mode before test
Other PreparationsApplication key
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Page17Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification - Task ofthe on-site engineers Verification in Idle Mode
Frequency Check
Check whether the frequency number of the cell to be measured is
consistent with the planned data
Scramble Check
Check whether the scramble configuration is consistent with the planned
configuration
LAC/RAC Check
Check whether the LAC/RAC of the cell to be measured is consistent with the
planed one.
CPICH_RSCP/CPICH_Ec/Io (Near Site) Test
Check whether the CPICH RSCP and CPICH Ec/Io received by UE are greater
than the threshold
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Page18Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification - Task ofthe on-site engineers Verification in connect Mode Originating and Terminating Connection Test of Voice Service
Check whether the originating and terminating function of voice service
function normally by call quality test
Originating and Terminating Connection Test of VP Service
Check whether the originating and terminating function of VP servicefunction normally by call quality test
Connection Test of PS Services
Check whether the originating function of PS services are normal by handset
online service
Solving Problems
If on-site engineers find product function problems or parameter
configuration problems, the engineers must locate them and retest until
the problems are solved and process terminates.
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Page19Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification Task ofthe RNO engineers Preparations
Cell Status Confirmation
Before checking site, you need to inquiry product support
engineers whether the cell is in normal status
Testing Route Selection
Before test, you must select a proper testing route according to
site distribution and local environment
Precautions
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Page20Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification Task ofthe RNO engineers Coverage DT Check
Check whether CPICH RSCP and CPICH Ec/Io received by
scanner is normal
Abnormal power amplifier
Abnormal connection of antenna-feeder
Inconsistency of antenna tile/direction angle from planned
one
Blocking by buildings
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Page21Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification Task ofthe RNO engineers
HSDPA Access Function Test
To test HSDPA access function
Check whether the antenna for receiving diversity
signals is reversely connected
Checking Antennas by Exchanging Feeders
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Page22Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification Task ofthe RNO engineers Antenna Diversity Check
If the receive antenna crossed, the uplink diversity receive gain is loss, and the
uplink interfere is doubled. It will affect the uplink capability.
Solving Problems
If RNO engineers find problems about product function, RNO engineers mustask product support engineers to solve problems
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Page23Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Single Site Verification
Summarization:
In single site verification stage, engineers check
whether equipment functions normally
Single site verification is a basis for the following RF
optimization and service optimization
If all verifications about function are accepted, the
single site verification is completed
After single site verification, optimization comes to RFoptimization
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Page24Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
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Page25Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow RF Optimization
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Page26Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - Overview
Once all the sites are installed and verification is complete, RFoptimization starts.
During the RF optimization stage, you will optimize radio frequency
(RF) signals , so that the distribution of radio signals is normal in
next service -- parameters optimization stage
RF optimization includes the following aspects:
Coverage optimization
Pilot pollution optimization
Handover optimization
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Page27Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization flow
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Page28Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - Preparation(1)
Deciding Optimization target Weak coverage
Pilot pollution
High SHO Factor based on DT
Dividing Clusters
Deciding Test Route
Confirm the KPI DT acceptance route with the operator before DT
Preparing Tools and Data
Preparing Software
Preparing Hardware Preparing Data
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Page29Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - Preparation(2)
Index Reference Remarks
CPICH Ec/Io 9dB 97% in urban area According to test result from the scanner, inunloaded and outdoor conditions, in planningcoverage areas, test in a grid-like route to cover allcells. 97% in suburban area
CPICH RSCP 95dBm 98% in urban area According to test result from the scanner, in
unloaded and outdoor conditions, in planningcoverage areas, test in a grid-like route to cover allcells. The coverage level request is basic. Ifoperators have penetration loss request, add thepenetration loss to the coverage level.
95% in suburban area
SHO Factor based on DT 30%40% The SHO Factor based on DT should be 5% to 10%lower than the goal, because the following
optimizations cause the soft handover factor toincrease
Pilot pollution ratio 5%
RF Optimization - Targets
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Page30Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - Preparation(3) Dividing Clusters
RF optimization must be performed on a group of or a cluster of
NodeBs ,This ensures that interference from intra-frequency
neighbor cells are considered during optimization.
Dividing clusters involves approval by the operator.
Deciding Test Route
The KPI DT acceptance route is the core route of RF optimization
test routes. Its optimization is the core of RF optimization.
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Page31Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - Preparing Tools andData:
Software
Genex Probe
Genex Assistant
Genex Nastar
Mapinfo
Device
Scanner
Test terminal anddata line
Laptop
Vehicle mountedinverter
Needed data
List of engineeringparameters
Map
KPI requirements
Network configurationparameters
Survey report
Single site verificationchecklist
Floor plan of the targetbuildings
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Page32Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - DataCollection During RF optimization stage, the key is the optimization of radio
signals distribution, with the major means of DT and indoor test
DT is a major test. Collect scanner and UE data of radio signals
by DT test
Usually the DT and indoor test during RF optimization stage is
based on VP service.
During RF optimization stage, collect neighbor cell data of
network optimization and other data configured in RNC database
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Page33Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization - RF problemsolutions
Antenna tilt
Antenna azimuth
Antenna location Split sector
Remove sector
Combine sector
Antenna height
Antenna type
TMA RRU
Site location
New site
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Page34Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Optimization
Attention:
During the RF optimization ,sometimes the problems can be resolved
completely by proper adjustment, but there is also some
disadvantages of the RF optimization
The duration of the RF Optimization will be always very long
Some adjustment is difficult to implement
If the problems are not resolved by the RF optimization, it is
difficult to recover the antennas back to the former conditions
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Page36Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
Coverage problem analysis is key to RF optimization.
It involves signal distribution. The coverage
problems to be analyzed include:
Weak coverage Overshoot coverage
Unbalance between uplink and downlink
No primary pilot cell
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Page37Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
Coverage Analysis Processes:
Downlink Coverage Analysis
Analyzing Pilot Coverage Strength
Analyzing Pilot Coverage quality
Analyzing Primary Pilot Cell
Analyzing comparison of UE and Scanner Coverage
Uplink Coverage Analysis
Analyzing Uplink Interference Analyzing distribution of UE Transmit Power
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Page38Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
Downlink coverage analysis - Pilot Coverage Strength
Analysis
Check areas of poor coverage, suggestion value as
below:
Good: RSCP -85 dBm
Fair: -95 dBm RSCP < -85 dBm
Poor: RSCP < -95 dBm
Mark the areas with weak coverage or common seamless
coverage of large areas for further analysis
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Page39Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem AnalysisDownlink coverage analysis -Pilot Coverage StrengthAnalysis
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Page40Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
Downlink coverage analysis - Pilot Coverage quality Analysis Ec/Io plot should also be analysed based on the thresholds :
Good: Ec/Io -8 dB
Fair: -14 dB Ec/Io < -8 dB
Poor: Ec/Io < - 14 dB Areas of poor Ec/Io should be highlighted for further investigation
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Page41Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
-15.5
-104
-20
-19
-18
-17
-16
-15
-14
Ec/Io RSCP
- 120
- 115
- 110
- 105
- 100
- 95
- 90
Whats the
problem?
Downlink coverage analysis -Pilot Coverage qualityAnalysis:
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Page42Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
-15.5
-63
-20
-19
-18
-17
-16
-15
-14
Ec/Io RSCP
- 90
- 85
- 80
- 75
- 70
- 65
- 60
Whats the
problem?
Downlink coverage analysis -Pilot Coverage qualityAnalysis:
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Page43Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing Primary Pilot Cell:
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Page44Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem Analysis
Downlink coverage analysis - Analyzing Primary Pilot
Cell:
Cell primary pilot analysis is analyzing cell scramble
information obtained in DT The content to be checked include :
Weak coverage cell
Cross-cell coverage cell
No primary pilot cell
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Page45Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing Primary Pilot Cell:
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Page46Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
RF Coverage Problem AnalysisDownlink coverage analysis -Analyzing comparison of UE and Scanner Coverage:
Inconsistent Best Service Cellbetween scanner and UE
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Page49Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution Problem Analysis
Pilot Pollution Point Definition:
The pilot pollution is that excessive strong pilots exist in
a point but no primary pilot is strong enough
Pilot pollution exists if all the following conditions aremet:
The number of pilots that meet the following condition is
more than 4 and CPICH_RSCP > -100dBm
(CPICH_RSCP1st - CPICH_RSCP 4th)< 5dB
Pilot Pollution ProblemPilot Pollution Problem
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Page50Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysis
-62-63
-64-66 -67
-81
-90
-85
-80
-75
-70
-65
-60
SC1 SC2 SC3 SC4 SC5 SC6
RSCP
(dB
m)
Active Set Pilot Pollution
Margin
Not
Pilot Pollution
Pilot Pollution Definition - Judgment Standards :
Pilot Pollution ProblemPilot Pollution Problem
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Page51Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysisPilot Pollution Definition - Estimated Active Set Size ExampleEstimated Active Set Size Example :
Pilot Pollution ProblemPilot Pollution Problem
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Page52Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution ProblemPilot Pollution ProblemAnalysisAnalysis
SC Count % in Pollution Set
8 206 12.9%
9 165 10.3%
10 157 9.8%
11 156 9.7%
12 148 9.2%
13 135 8.4%
16 95 5.9%
17 94 5.9%
18 76 4.7%19 74 4.6%
20 73 4.6%
21 56 3.5%
32 54 3.4%
35 39 2.4%
37 33 2.1%
43 19 1.2%
48 8 0.5%
53 7 0.4%
67 3 0.2%
80 2 0.1%
130 2 0.1%
Should be investigatedShould be investigated
Pilot Pollution Definition - Estimated Active Set Size Example :
Pilot pollution results
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Page53Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution Problem Analysis
Causes of Pilot Pollution :
Improper Cell Distribution
Over High NodeB or Highly-mounted Antenna
Improper Antenna Azimuth
Improper Antenna Down Tilt
Improper PICH Power
Ambient Factors
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Page55Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution Problem Analysis
Process for Analyzing Pilot Pollution Analyze scanner-based RSCP for 1st Best Service Cell and Ec/Io for
1st Best Service Cell
Analyze scanner-based Whole PP
Locate the cells that cause pilot pollution of the key areas.
Judge whether the pilot pollution is caused by existence of multiple
strong pilots or lack of a strong pilot
Confirm the cells that need eliminating the coverage of an area and
that need enhancing the coverage of an area Retest after adjustment
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Page56Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Pilot Pollution Problem Analysis
Solutions of Pilot Pollution :
Antenna Adjustment
PCPICH Power Adjustment
Using RRU or Micro Cells
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Handover Problem Analysis
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Page58Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Handover Problem Analysis -Neighbor cell optimization
During RF optimization stage, missing neighbor cell is a key problem. The neighborcell optimization includes adding and removing neighbor cells
Add: Missing neighbors
Remove: These neighbors that were not measured but are in the neighbor list.
Careful consideration is needed prior to removing neighbours
Neighbor cell optimization can be analyzed by :
Scanner Data
UE Data Analysis
H d P bl A l iH d P bl A l i
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Page59Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Handover Problem Analysis -Handover Problem Analysis -
Neighbor cell optimizationNeighbor cell optimization By the scanner data, the Assistant can generate a
neighbor cell analysis report in the format of Excel
Hando er Problem Anal sis
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Page60Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Handover Problem Analysis -Neighbor cell optimization
We can also analyze a missing neighbor cell by UE DT data
The daemon analysis tool can seldom analyze UE data automatically and generate
missing neighbor cells
but we can Compare the active set Ec/Io distribution diagram measured by UE and
that measured by scanner
The spots with missing neighbor cells has a poor Ec/Io measured by UE and a
strong Ec/Io scanned by scanner .
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Page62Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
WCDMA Optimization Flow
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Page63Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow Parameter Optimization
Purpose of Parameters
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Page64Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Purpose of ParametersOptimization
Purpose of parameters optimization
Increase the access success ratio
Decrease the call drop ratio
Increase the quality of service The tools and data for analysis:
scanner and UE
RNC record data
Statistic tools and KPI
MSC & SGSN record if necessary
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Page65Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Drive test The contents of drive test
The call setup test for voice service
The continuous call test for voice service
Idle mode test
The call setup test for video phone service
The continuous call test for voice service
The call setup test for PS service
The continuous call test for PS service
The test should be performed repeatedly to the position withThe test should be performed repeatedly to the position with
problems to make sure that the problem is repeatableproblems to make sure that the problem is repeatable
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Page69Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents
1. Introduction of Optimization Flow
2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization
5. Parameters Optimization
6. Optimization Report
WCDMA Optimization Flow
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Page70Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
WCDMA Optimization Flow Optimization Report Output
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Page71Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Optimization Report
The
optimization report
should be presented after the projectpasses the customer acceptance. The optimization report should
include:
Project background introduction
Existing network status
Acceptance criteria
Optimization process
Problem analysis and adjustment recommendation, and the effect for the
implemented part
Acceptance test and result
Leftover problems and suggestions from the optimization point of view.
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