Post on 22-Oct-2015
description
UTRAN Optimisation Process
AgendaAgendal Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
l To provide an overview of the overall optimisation process
l To introduce the different optimisation phases of a 3G Radio Network
l To prepare for more in-depth discussions of various optimisation topics
Introduction & ObjectivesIntroduction & Objectives
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
[1] Single Site Verification:
v Every new site is tested and verified to be functioning properly
v Any installation or parameter errors must be rectified.
[2] RF Optimisation:
v Once clusters of sites are ready, RF Optimisation can be
started in order to optimise coverage and minimise interference
and pilot pollution.
v All RF-related failures or drop calls must be resolved.
Optimisation Approach Overview (1/3)Optimisation Approach Overview (1/3)
[3] Services Testing & Parameter Optimisation:
v Comprehensive services testing should be carried out in areas
of good coverage to determine system performance
v Causes of any failures must be identified and whenever
necessary relevant parameters should be optimised.
[4] Regular Reference Routes & Stats Analysis:
v Regular testing & stats analysis will be needed to identify and
resolve any new issues as a result of (e.g. increased traffic).
Optimisation Approach Overview (2/3)Optimisation Approach Overview (2/3)
Optimisation Approach Overview (3/3)Optimisation Approach Overview (3/3)
Cluster of sites ready?
No
Re-optimisationNeeded?
NoYes
New Sites Integrated
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference RouteTesting & Stats Analysis
RF Optimisation
Yes
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
Single Site Verification (1/3)Single Site Verification (1/3)
Cluster of sites ready?
New Sites Integrated
Re-optimisationNeeded?
No
NoYes
RF Optimisation
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference Route Testing & Stats Analysis
Yes
Single Site Verifications (2/3)Single Site Verifications (2/3)
l Objectives:
è 1. Verify Coverage (RSCP & Ec/Io)
è 2. Verify scrambling codes
è 3. Verify no installation faults
è 4. Make test calls
l Tools:
è Scanner + UE
l Process:
è A detailed check list of various tests must be conducted.
è Tests will include: call setups, reselection, handover, LA/RA
update, PS attach & detach, PDP activation, etc.
è If unusual low signal strength should check wrong feeder
connection (Tx/Rx main antenna, Rx diversity antenna), etc.
Single Site Verifications (3/3)Single Site Verifications (3/3)
l An example Check list
□ □25 Overall performance and coverage area as expected by a brief drive test □ □
Notes: If the item is OK, mark the '√' on the '□'; If the item is not OK, mark the '╳' on the '□'; If the item is not checked, mark the '∕' on the '□'.
□ □ □ □
□ □ □
□ □
□ □ □
□ □ □ □
□□
□□ □ □ □□ □
□□
□□ □ □ □□ □ □
□ □ □ □□ □ □ □
RemarksNew Expansion Migration Others
Site Expanded from:Site Migrated from RNC:
To:To RNC:
Site Connected to RNC:
Idle
Mode
Site Migration: Others:
□ □ □ □
New Site: Site Expansion:
Mapinfo Update □Data Base Update □
ReminderSite Checklist
□ □□
24 Installed antenna is of the planned type □
□
□ □
□21 Soft handover for VP service to and from the 3G cells checked OK20
23 Inter-system handover for voice service to the 2G cells checked OK 22 Soft handover for PS service to and from the 3G cells checked OK
Soft handover for voice service to and from the 3G cells checked OK19 RA update proceduce is checked □18 The PS service quality is good by the engineer feeling □ □ □
□ □
15 PS attach is checked □ □ □ □
□ □□ □□
17 PS PDP activation and deactivation is checked □ □
14 The VP service quality is good by the engineer feeling□
Mobile terminating calls and mobile originating calls for voice service is checked
13 Mobile terminating calls and mobile originating calls for VP service is checked□ □ □□
□
□ □□ □ □
□□ □ □
7 Cell reselection from 2G to 3G is checked □ □ □□8 MO-SMS and MT-SMS □ □ □
□
The LAC/RAC is correctly defined ( SIB 1 )□ □
6 Cell reselection from 3G to 2G is checked 5 LA update proceduce is checked
□ □4 The neighbor list and parameters are as planned ( SIB 11 )
□ □
Site Name:
□Frequency and Scrambling Code correctly defined
Site ID:
□No. Activity/Process
CPICH_RSCP > -85 dBm near site
Conn
ectio
n Mo
de 9
2 Cell selection and reselection parameters are as planned ( SIB 3 )1
3
12 The voice service quality is good by the engineer feeling1110 CPICH_EcIo > -8 dB near site
2-Name/Designation: Signature: Data:
Checked by:1-Name/Designation: Signature: Data:
PS
Remarks (Further comments):
Hand
over
26 Antenna Swapping TestGen
16 PS detach is checked □
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
RF OptimisationRF Optimisation
Cluster of sites ready?
New Sites Integrated
Re-optimisationNeeded?
No
NoYes
RF Optimisation
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference Route Testing & Stats Analysis
Yes
RF Optimisation – Intro (1/2)RF Optimisation – Intro (1/2)
l Objectives:è 1. Optimize CPICH and service coverage & cell dominance
è 2. Minimize interference & pilot pollution
è 3. Optimize neighbor list
è 4. Resolve any RF-related drop calls
l Tools:è Scanner + UE with logging tool
l Process:è Drive survey with a UE initially in a continuous AMR call.
è Drop calls should be analyzed to determine if the causes are RF related.
l Solutions:è Neighbor list modification
è Antenna tilt and/or azimuth changes.
Data Analysis
RF Optimisation – Intro (2/2)RF Optimisation – Intro (2/2)
l Process Flow:Start
Identify any RF Issues
Identify candidate cells for changes
Determine amount of change
Identify nature of required changes
Implement changes
Repeat Drive Test
Yes
End
Problem Resolved?
No
Drive Test
RF Optimisation – Analysis (1/8)RF Optimisation – Analysis (1/8)
l Analysis Approach: Various plots from UE and
scanner need to be analysed:è Cell Dominance (best serving cell plots)
è Down Link Coverage (CPICH RSCP & Ec/Io plots)
è Uplink Coverage (UE Tx power plots)
è Pilot Pollution (Pilot pollution table & Estimated Active set size)
è Neighbour list verification
è SHO Performance
è Drop Calls
RF Optimisation – Analysis (2/8)RF Optimisation – Analysis (2/8)
l Analysis of Cell Dominance:
To identify:l Cells with no or poor
dominance
l Cells with excessive
dominance
l Best server differences
between scanner & UE
Scrambling Code plot of best serving cells
RF Optimisation – Analysis (3/8)RF Optimisation – Analysis (3/8)
l Analysis of DL CPICH Coverage:
To identify:l Areas of poor coverage (i.e. poor RSCP & Ec/Io)
l Areas of high interference (i.e. high RSCP but low Ec/Io)
CPICH RSCP Plot
CPICH Ec/Io Plot
RF Optimisation – Analysis (4/8)RF Optimisation – Analysis (4/8)
l Analysis of UL Coverage:
To identify:l Uplink coverage limitation (i.e.
UE reaching max Tx power)
UE Tx power.
RF Optimisation – Analysis (5/8)RF Optimisation – Analysis (5/8)
To identify:l Cells causing pilot
pollution
l Locations where there
are too many soft
handoff candidates
Estimated active set size from scanner data.
SC Count % in Pollution Set8 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%
l Analysis of Pilot Pollution:
Pilot pollution results
RF Optimisation – Analysis (6/8)RF Optimisation – Analysis (6/8)
To identify:l Any missing neighbours
though analysis scanner
data & RNC neighbour
list
l Any missing neighbours
causing drop calls
l Any unnecessary
neighbours.Neighbour list verification.
l Analysis of Neighbour List:
009 576 Retain 018 82 14.2%Retain 010 46 8.0%Retain 016 31 5.4%Retain 032 20 3.5%Retain 011 18 3.1%
Add 130 17 3.0%Retain 021 17 3.0%Retain 008 12 2.1%Retain 020 6 1.0%Retain 012 5 0.9%Retain 017 2 0.3%
Remove 053 0 0.0%Remove 019 0 0.0%Remove 034 0 0.0%Remove 037 0 0.0%Remove 013 0 0.0%Remove 051 0 0.0%
70548 Ajman Central 25.41204 55.447
Nbr SC Sample Count %Latitude Longitude Sample
Count ActionSC Cell Site
RF Optimisation – Analysis (7/8)RF Optimisation – Analysis (7/8)
l Analysis of SHO Performance:
To determine soft hand off
success rate.
Scrambling Code plot of best serving cells
Number of Active Set Updates
Event CountEvent 1a - Cell Addition328Event 1b - Cell Removal306Event 1c - Cell Replacement64
Number of Active Set Update Completes
Event CountEvent 1a - Cell Addition326Event 1b - Cell Removal305Event 1c - Cell Replacement62
Soft-Handover Success Rate
Event RateEvent 1a - Cell Addition99.4Event 1b - Cell Removal99.7Event 1c - Cell Replacement96.9
RF Optimisation – Analysis (8/8)RF Optimisation – Analysis (8/8)
l Analysis of Drop Calls:To identify:l Exact cause of the drop calls
Drop calls
RF Optimisation – SolutionsRF Optimisation – Solutions
l Antenna Optimisation: (in order of priority)
è Antenna tilt
è Antenna azimuth
è Antenna location
è Antenna height
è Antenna type
è Site location
è New site
l Neighbour List Optimisation: (in order of priority)
è Add missing neighbors
è Remove unnecessary neighbors
Neighbour List tuning
Antenna & SiteOptimisation
RF Optimisation – Process SummaryRF Optimisation – Process Summary
Drive test data(scanner + UE)
Neighbour list
Thresholds &KPIs
AnalysisDominance Best server
scrambling code
CPICH Coverage CPICH RSCP & Ec/Io
DL Interference CPICH Ec/Io
UL Coverage UE Tx power
Neighbour List Scanner vs. RNCneighbours
Pilot Pollution Scanner active set size
Drop calls Causes analysis
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
Services Testing & Parameter Optimisation (1/6)Services Testing & Parameter Optimisation (1/6)
Cluster of sites ready?
New Sites Integrated
Re-optimisationNeeded?
No
NoYes
RF Optimisation
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference Route Testing & Stats Analysis
Yes
Services Testing & Parameter Optimisation (2/6)Services Testing & Parameter Optimisation (2/6)
l Once RF optimisation is completed detailed testing of CS and PS services should be completed
l During testing, end-to-end logs should be collected (i.e. UE as well as RAN & when necessary CN)
l Any failures (e.g. call set-up, drop calls, etc) MUST be analysed to determine exact causes
l Any system defects must be raised to Technical Support for resolution
l Appropriate parameters should be identified for possible optimisation to resolve failures or to reduce impact of any system defects
Services Testing & Parameter Optimisation (4/6)Services Testing & Parameter Optimisation (4/6)
Determine (Non-RF) Failure Causes
Services Testing
No
Improve via Parameters? Optimise Parameters
Yes
No
No
System Defect? Raise Defect
Yes
100 % Success Rate?
End
Yes
Services Testing & Parameter Optimisation (4/6)Services Testing & Parameter Optimisation (4/6)
l Basic Parameters Optimisation Steps:
è Identify candidate parameters
è Identify various trade-offs
è Decide on suitable metrics for analysis of results
è Decide on parameter ranges to be tested
è Define test cases and drive routes including various
environments & clutter
è Execute tests
è Perform detailed analysis (logs as well as network stats)
è Conclude parameters values that provide optimum trade-offs
Services Testing & Parameter Optimisation (5/6)Services Testing & Parameter Optimisation (5/6)
Define Test Cases & select drive routes
Perform Tests
Data Analysis &
Conclusions
CandidateParameters
Clutter & Environment
factors
ParametersRanges
Trade Offs AnalysisMetrics
Services Testing & Parameter Optimisation (6/6)Services Testing & Parameter Optimisation (6/6)
l Potential Parameter Optimisation Candidates:
è Reselection parameters
è Handover parameters
è Power control parameters
è Admission and congestion control
è Common control channel powers
è Etc.
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
Regular Testing & Stats Analysis (1/4)Regular Testing & Stats Analysis (1/4)
Cluster of sites ready?
New Sites Integrated
Re-optimisationNeeded?
No
NoYes
RF Optimisation
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference Route Testing & Stats Analysis
Yes
Regular Testing & Stats Analysis (2/4)Regular Testing & Stats Analysis (2/4)
l Optimisation is an on-going activity and as a result:
è Regular drive tests of designated routes should be carried out
(e.g. on monthly basis)
è Routine analysis of network stats to identify any reduction in
network performance
Regular Testing & Stats Analysis (3/4)Regular Testing & Stats Analysis (3/4)
l Regular Drive Testing- Objectives:
è To benchmark network performance and user experience (e.g.
call setup SR, call drop rate, PS throughputs, etc)
è To identify any degradation in coverage and/or increase in
interference as a result of increased traffic or changes in
environment
è To assess impact of newly introduced RAN features.
è To monitor the progress of on-going optimisation activities.
Regular Testing & Stats Analysis (4/4)Regular Testing & Stats Analysis (4/4)
l Routine Network Stats analysis - Objectives:
è To benchmark network performance, particularly during the
busy hour.
è To monitor traffic volumes and patterns as well as traffic profiles
(i.e. mix of services).
è To assess impact of parameter changes as part of parameter
optimisation exercises.
è To identify poorly performing cells that need investigation to
establish underlying cause of poor performance.
è To provide triggers for network upgrade decisions.
AgendaAgenda
l Introduction and Objectives
l Optimisation Phases Overview
l Single Site Verification
l RF Optimisation
l Services Testing & Parameters Optimisation
l Regular Reference Routes & Stats Analysis
l Summary
Optimisation Approach OverviewOptimisation Approach Overview
Cluster of sites ready?
New Sites Integrated
Re-optimisationNeeded?
No
NoYes
RF Optimisation
Single Site Verification
Services Testing &Parameter Optimisation
Regular Reference RouteTesting & Stats Analysis
Yes
Thank you!