Huawei Optimisation Process

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 RF Optimisation



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).



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 RF Optimisation



l Summary

Single Site Verification (1/3)Single Site Verification (1/3)




No

NoYes

RF 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 RF Optimisation



l Summary

RF OptimisationRF Optimisation




No

NoYes

RF Optimisation




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


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


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


l Analysis of UL Coverage:

To identify:l Uplink coverage limitation (i.e.

UE reaching max Tx power)

UE Tx power.


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


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


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


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 RF Optimisation



l Summary

Services Testing & Parameter Optimisation (1/6)Services Testing & Parameter Optimisation (1/6)




No

NoYes

RF Optimisation




Yes


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


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


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


Define Test Cases & select drive routes

Perform Tests

Data Analysis &

Conclusions

CandidateParameters

Clutter & Environment

factors

ParametersRanges

Trade Offs AnalysisMetrics


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 RF Optimisation



l Summary

Regular Testing & Stats Analysis (1/4)Regular Testing & Stats Analysis (1/4)




No

NoYes

RF Optimisation




Yes


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


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.


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 RF Optimisation



l Summary

Optimisation Approach OverviewOptimisation Approach Overview




No

NoYes

RF Optimisation



Regular Reference RouteTesting & Stats Analysis

Yes

Thank you!

Huawei Optimisation Process

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