OWO300010 WCDMA UTRAN Optimization Flow ISSUE1.11.pdf
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WCDMA UTRANOptimization Flow
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Foreword
WCDMA optimization is a very important part in the lifecycle of
the network.
Mainly, the optimization includes the preparation, single site
verification, RF optimization and parameters optimization.
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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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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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WCDMA Optimization Flow
Project Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation
Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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Introduction of Optimization Flow
Final Documents:
SSV Reports
Optimization Report
Engineering Parameter Table
Cell Parameter Table
Process Documents:
Engineer Parameter Table
Cell Parameter Table
Parameter Changing Record
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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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WCDMA Optimization Flow - Preparation
Project Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation
Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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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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The Preparation for Projection
Understanding of the Existing Network :
Radio Network Planning report
Latest engineering parameter table and cell parameter table
OMC statistic data
Subscriber complaints
Historical Optimization Reports
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The Preparation for the
Optimization Projection Cluster Division
One cluster should cover one continuous area, which isconvenient for one time drive test;
Cluster division should consider the terrain, administration and
main roads.
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The Preparation for the Optimization Projection
Optimization Team Establishment
RNO leader-1
Data Analyzer
Drive Test Operator
Driver
RNO leader-n
Data Analyzer
Drive Test Operator
Driver
..................
RNO manager
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The Preparation for the Optimization Projection
Optimization Tools
Hardware
UMTS Scanner
UMTS Test UE
GPS and data line
Laptop
Digital camera Spectrum analyzer
Software:
DT tools
Post processing tools
MapInfo
Google earth
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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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WCDMA Optimization Flow Single SiteVerification
Project Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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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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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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Single Site Verification - Tasks of the
on-site engineers
Application key
Preparations Site Status Check
For each cell to be measured, check Status by LMT or M2000
Configuration Data Collection and Check
check whether the data configured is consistent with the planned data
Testing Point Selection
Test UE Setup
Set the UE to testing mode before test Other Preparations
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Single Site Verification - Tasks of the
on-site engineers
Verification in Idle Mode
Frequency Check
Check whether the frequency is consistent with the planned data
Scramble Check
Check whether the scramble is consistent with the planned data
LAC/RAC Check
Check whether the LAC/RAC is consistent with the planed data.
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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Single Site Verification - Tasks of the
on-site engineers
Verification in connected Mode Originating and Terminating Call 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
service function normally by call quality test
Access Test of PS Services
Check whether the PS services access are normal Solving Problems
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Single Site Verification Task of the
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
Testing Tools
Hardware
Software
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Single Site Verification Task of the
RNO engineers
Coverage Check Check whether CPICH RSCP and CPICH Ec/Io received by scanner is
normal
Inconsistency of antenna tile/direction angle from planned one
Check whether the RX ports of different cell are reversely
connected
Fixed Maximum Transmit Power of UE, measure the RTWP of the cells in
OMC room
Checking Antennas by Exchanging Feeders, measure the RSCP before
and after.
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Single Site Verification Task of the
RNO engineers
Service Function Test
MOC and MTC of Voice call
MOC and MTC of VP
UL and DL R99 PS service
HSDPA access function and throughput test
HSUPA access function and throughput test
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Single Site Verification Task of the
RNO engineers
Solving Problems
If RNO engineers find out some installation problem, ask the
installation team fix it and do retest to verify If RNO engineers find problems about product function, RNO
engineers must ask RAN engineers help to solve problems
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Single Site Verification
Summarization:
In single site verification stage, engineers check whether
equipment functions are normal
Single site verification is a basis for the following RF optimization
and Parameter optimization
If all verifications about function are accepted, the single site
verification is completed
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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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WCDMA Optimization Flow RF
Optimization
Project Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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RF Optimization - Overview
Once all the sites on-air and verification is completed, RF optimizationstarts
During the RF optimization stage, you willoptimize radio frequency
(RF) signals , so that the distribution of radio signal is normal in next
stage -- parameters optimization
RF optimization includes the following aspects:
Coverage optimization
Pilot pollution optimization
Handover optimization
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RF Optimization flow
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RF Optimization - Preparation (1)
Define Optimization targets Weak coverage
Pilot pollution
SHO Factor based on DT
Define Test Route
Cluster Division
Preparing Tools and Data
Preparing Software Preparing Hardware
Engineering and cell Parameter table
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RF Optimization - Preparation (2)
Index Reference Remarks
CPICH Ec/Io 9dB
97% in urban area According to test result from the scanner, in
unloaded and outdoor conditions, in planning
coverage areas, test in a grid-like route to cover all
cells. 97% in suburban
area
CPICH RSCP
95dBm
98% in urban areaAccording to test result from the scanner, in
unloaded and outdoor conditions, in planning
coverage areas, test in a grid-like route to cover all
cells. The coverage level request is basic. If
operators have penetration loss request, add the
penetration 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 to
increase
Pilot pollution ratio 5%
RF Optimization - Targets
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RF Optimization - Preparation (3)
Dividing Clusters
RF optimization must be performed on a group of or a cluster of
NodeBs , and to ensure that interference from intra-frequency
neighbor cells are considered during optimization.
Define Test Route
The test route should cover all sites, all main roads and VIP area.
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RF Optimization - Preparing Tools and Data:
Software
Genex Probe
Genex Assistant
Mapinfo
Google earth
Device
Scanner
Test terminal and dataline
GPS and data line
Laptop
Vehicle mountedinverter
Needed data
List of engineeringparameters
Map
KPI requirements
Network configurationparameters
Survey report
Single site verification
checklistFloor plan of the targetbuildings
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RF Optimization - Data Collection
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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RF Optimization - RF problem solutions
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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RF Optimization
Some advices:
Before the RF adjusting, wed better survey the relative sites, and
give some applicable advice
If possible, do the RF adjustment and test the effect at the sametime
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RF Coverage Problem Analysis
The coverage problems to be analyzed include:
Weak coverage
Overshoot coverage
Unbalance between uplink and downlink
No dominating cell
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RF Coverage Problem Analysis
Coverage Analysis Processes:
Downlink Coverage Analysis
Analyzing Pilot Strength
Analyzing Pilot quality
Analyzing Dominate Cell
Analyzing comparison of UE and Scanner Coverage
Uplink Coverage Analysis
Analyzing Uplink Interference
Analyzing distribution of UE Transmit Power
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RF Coverage Problem Analysis
Downlink coverage analysis Pilot Strength Analysis
Check areas of weak coverage, suggestion value as below:
Good: RSCP -85 dBm
Fair: -95 dBm RSCP 10 dBm
Assume the optimization indexes of UE transmit power as below:
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RF Coverage Problem Analysis
The distribution of UE transmit power
UplinkUplink Coverage - Distribution of UE Transmit Power
The distribution of UE transmit power reflects the distribution
of uplink interference and uplink path loss
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Pilot Pollution Problem Analysis
Pilot Pollution Point Definition:
The pilot pollution is that excessive strong pilots exist in a point
but no pilot is strong enough
Pilot pollution exists if all the following conditions are met:
The number of pilots that meet the following condition is more than 4
and CPICH_RSCP > -100dBm
(CPICH_RSCP1st - CPICH_RSCP 4th)< 5dB
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Pilot Pollution Problem Analysis
Influence of Pilot Pollution :
Pilot pollution causes the following network problems:
Ec/Io Deterioration
Call Drop Due to Handover
Capacity Decline
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Pilot Pollution Problem Analysis
-62-63
-64-66 -67
-81
-90
-85
-80
-75
-70
-65
-60
SC1 SC2 SC3 SC4 SC5 SC6
RSCP
(dBm)
Active Set Pilot Pollution
Margin
NotPilot Pollution
Pilot Pollution Definition - J udgment Standards :
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Pilot Pollution Problem Analysis
Pilot Pollution - Estimated Active Set Size:
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Pilot Pollution Problem Analysis
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 investigated
Pilot Pollution - Estimated Active Set Size
Pilot pollution results
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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 CPICH Power
Ambient Factors
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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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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
By adjusting RF parameters ,we can Control the size and location of
handover areas ,then we can eliminate handover call drop due to
sharp fluctuation and increase handover success rate.
During RF optimization stage, the involved handover problem include:
Neighbor cell optimization
Controlling SHO Factor based on DT
H d P bl A l i N i hb
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Handover Problem Analysis - Neighbor
cell optimization
The neighbor cell optimization includes adding and removingneighbor cells.
Add: Missing neighbors
Remove: The neighbors are never measured but in the neighbor
list.
Neighbor cell optimization can be analyzed by :
Scanner Data
UE Data Analysis
Careful consideration is needed prior to removing neighbours
H d P bl A l i N i hb
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Handover Problem Analysis - Neighbor
cell optimization By the scanner data, the Assistant can generate a neighbor cell
analysis report in the format of Excel
Handover Problem Analysis Neighbor
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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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Handover Problem Analysis
Controlling SHO Factor based on DT: According to the DT data from scanner, you can obtain the SHO
Factor based on DT, defined as below:
DTinpointscollectedscannertotalofNumberconditionshandovermeet thethatDTinpointscollectedscannerofNumberRatioHandoverSoft
The SHO Factor based on DT during RF optimization
stage must be 5%
10% lower than the KPI target
value
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Handover Problem Analysis
UE SHO Performance
The success rates for event 1a, 1b & 1c and can be obtained from
softwareNumber of Active Set Updates
Event Count
Event 1a - 328
Event 1b - 306Event 1c - 64
Number of Active Set Update Completes
Event Count
Event 1a - 326
Event 1b - 305Event 1c - 62
Soft-Handover Success Rate
Event Rate
Event 1a - 99.4
Event 1b - 99.7Event 1c - 96.9
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RF Analysis Approaches Neighbor List
Controlling SHO Factor based on DT
If the SHO Factor based on DT is over large, decrease or change
the handover areas by using the following methods for shrinking
coverage areas:
Increase the down tilt
Adjust azimuth
Decrease the antenna height
Decrease the PICH power
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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 Parameter
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WCDMA Optimization Flow Parameter
OptimizationProject Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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Purpose of Parameters Optimization
Purpose of parameters optimization
Decrease the access success ratio
Decrease the call drop ratio
Increase the quality of service
The tools data and tools for analysis:
Drive test data and analysis tools
Statistic data and analysis tools RNC trace and logs data
MSC & SGSN record if necessary
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Drive test The contents of drive test
Idle mode test
The short call test for voice service
The continuous call test for voice service
The short call test for video phone service
The continuous call test for voice service
The access test for R99 PS service
The continuous call test for R99 PS service
HSDPA FTP download test
The test should be performed repeatedly to the position withproblems to make sure that the problem is repeatable
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Drive Test Data Analysis
Drive Test Data Analysis
Analyzing and finding out the solution for access failure
Analyzing and finding out the solution for drop call
Analyzing and finding out the solution for service quality relatedproblems
Adjustment Recommendation and
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Adjustment Recommendation and
Implementation
Adjustment Recommendation and Implementation
Common Control Channel Power Allocation parameters
RL Maximum Power parameters
Intra-frequency Handover parameters Inter-frequency Handover parameters
Inter-RAT Handover parameters
Power Control parameters
Access parameters
Other related parameters
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Test for Special Areas
Special area refers to a small district or indoors environment
Operator offices, residence of VIP
Key hotels or entertainment location
Government location
Locations of large company or group subscribers
Locations tend to be cared , such as railway station or airport
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Contents
1. Introduction of Optimization Flow2. The preparation for the Optimization Project
3. Single Site Verification
4. RF Optimization5. Parameters Optimization
6. Optimization Report
WCDMA Optimization Flow Optimization
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WCDMA Optimization Flow Optimization
Report OutputProject Start
Single Site
Verificaiton
Preparation and
Startup
RF
Optimization
Parameter
Optimization
Acceptance and
Report
Network Information
Collection
Cluster Division and
Team Establishment
Optimization Tools
Preparation Drive Test and RNC
Configuration Collection
Trouble shooting
Engineering Parameter
Adjustment Preparation
Data Collection
DT and Statistic
Analysis Parameter Adjustment
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Optimization Report
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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