89025817 huawei optimisation process

8/14/2019 89025817 Huawei Optimisation Process

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UTRAN Optimisation Process


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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


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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


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AgendaAgenda




l RF Optimisation



l Summary


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[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)


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[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).



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Cluster of sites

ready?

No

Re-optimisation

Needed?

NoYes

New Sites Integrated

Single Site Verification

Services Testing &Parameter Optimisation

Regular Reference RouteTesting & Stats Analysis

RF Optimisation

Yes


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AgendaAgenda

l

Introduction and Objectivesl Optimisation Phases Overview


l RF Optimisation



l Summary


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

Cluster of sites

ready?


Re-optimisation

Needed?

No

NoYes

RF Optimisation




Yes


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Single Site Verifications (2/3)Single Site Verifications (2/3)

l Objectives:

1. Verify Coverage (RSCP & Ec/Io) 2. Verify scrambling codes

3. Verify no installation faults

4. Make test calls

l Tools:

Scanner + UE

l Process:

A detailed check list of various tests must be conducted.

Tests will include: call setups, reselection, handover, LA/RA

update, PS attach & detach, PDP activation, etc.

If unusual low signal strength should check wrong feeder

connection (Tx/Rx main antenna, Rx diversity antenna), etc.


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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:

o:o RNC:

Site Connected to RNC:

IdleMode

Site Migration: Others:

New Site: Site Expansion:

Mapinfo UpdateData Base Update

Reminder

Site Checklist

24 Installed antenna is of the planned type

21 Soft handover for VP service to and from the 3G cells checked O20

23 Inter-systemhandover for voice service to the 2G cells checked OK22 Soft handover for PS service to and from the 3G cells checked O

Soft handover for voice service to and from the 3G cells checked O19 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 che

13 Mobile terminating calls and mobile originating calls for VP service is check

7 Cell reselection from2G to 3G is checked 8 MO-SMS and MT-SMS

The LAC/RACis correctly defined ( SIB 1 )

6 Cell reselection from3G to 2G is checked5 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

ConnectionMod 9

2 Cell selection and reselection parameters are as planned ( SIB 3 )1

3

12 The voice service quality is good by the engineer feeling11

10 CPICH_EcIo > -8 dB near site

2-Name/Designation: Signature: Data:

Checked by:

1-Name/Designation: Signature: Data:

PS

Remarks (Further comments):

Handover

26 Antenna Swapping TestGen

16 PS detach is checked


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AgendaAgenda




l RF Optimisation



l Summary


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RF OptimisationRF Optimisation

Cluster of sites

ready?


Re-optimisation

Needed?

No

NoYes

RF Optimisation




Yes


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RF OptimisationIntro (1/2)RF OptimisationIntro (1/2)

l Objectives:

1. Optimize CPICH and service coverage & cell dominance

2. Minimize interference & pilot pollution

3. Optimize neighbor list

4. Resolve any RF-related drop calls

l Tools:

Scanner + UE with logging tool

l Process:

Drive survey with a UE initially in a continuous AMR call.

Drop calls should be analyzed to determine if the causes are

RF related.

l Solutions:

Neighbor list modification

Antenna tilt and/or azimuth changes.


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Data

Analysis

RF OptimisationIntro (2/2)RF OptimisationIntro (2/2)

l Process Flow:Start

Identify any

RF Issues

Identify candidate

cells for changes

Determine amount of

change

Identify nature ofrequired changes

Implement changes

Repeat Drive Test

Yes

End

Problem

Resolved?No

Drive Test


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RF OptimisationAnalysis (1/8)RF OptimisationAnalysis (1/8)

l Analysis Approach: Various plots from UE and

scanner need to be analysed:

Cell Dominance (best serving cell plots)

Down Link Coverage (CPICH RSCP & Ec/Io plots)

Uplink Coverage (UE Tx power plots) Pilot Pollution (Pilot pollution table & Estimated Active set size)

Neighbour list verification

SHO Performance

Drop Calls


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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


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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


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l Analysis of UL Coverage:

To identify:

l Uplink coverage limitation (i.e.

UE reaching max Tx power)

UE Tx power.


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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 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%

l Analysis of Pilot Pollution:

Pilot pollution

results


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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 SCSample

Count%Lati tude Longitude

Sample

CountActionSC Cell Site


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l Analysis of SHO Performance:

To determine soft hand off

success rate.

Scrambling Code plot of best serving cells

um er o ct ve e t p ates

Event Count

Event 1a - 328

Event 1b - 306

Event 1c - 64

um er o ct ve et p ate omp etes

Event CountEvent 1a - 326

Event 1b - 305

Event 1c - 62

o t- an over uccess ate

Event Rate

Event 1a - 99.4

Event 1b - 99.7

Event 1c - 96.9


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l Analysis of Drop Calls:

To identify:

l Exact cause of the drop calls

Drop calls


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RF OptimisationSolutionsRF OptimisationSolutions

l Antenna Optimisation: (in order of priority)

Antenna tilt

Antenna azimuth

Antenna location

Antenna height

Antenna type

Site location

New site

l Neighbour List Optimisation: (in order of priority)

Add missing neighbors Remove unnecessary neighbors


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Neighbour List

tuning

Antenna & Site

Optimisation

RF OptimisationProcess SummaryRF OptimisationProcess Summary

Drive test data

(scanner + UE)

Neighbour list

Thresholds &

KPIs

AnalysisDominance

Best server

scrambling code

CPICH CoverageCPICH RSCP

& Ec/Io

DL Interference CPICH Ec/Io

UL Coverage UE Tx power

Neighbour ListScanner vs. RNC

neighbours

Pilot PollutionScanner active

set size

Drop calls Causes analysis


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AgendaAgenda




l RF Optimisation



l Summary


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

Cluster of sites

ready?


Re-optimisation

Needed?

No

NoYes

RF Optimisation


Services Testing &

Parameter Optimisation

Regular Reference Route

Testing & Stats Analysis

Yes


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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 reduceimpact of any system defects


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Determine (Non-RF)

Failure Causes

Services Testing

No

Improve viaParameters?

Optimise Parameters

Yes

No

No

System

Defect?Raise Defect

Yes

100 %

Success Rate?

End

Yes


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l Basic Parameters Optimisation Steps:

Identify candidate parameters

Identify various trade-offs

Decide on suitable metrics for analysis of results

Decide on parameter ranges to be tested

Define test cases and drive routes including various

environments & clutter

Execute tests

Perform detailed analysis (logs as well as network stats)

Conclude parameters values that provide optimum trade-offs


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Define Test Cases &

select drive routes

Perform Tests

Data Analysis &

Conclusions

Candidate

Parameters

Clutter &

Environment

factors

Parameters

Ranges

Trade OffsAnalysis

Metrics


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l Potential Parameter Optimisation Candidates:

Reselection parameters

Handover parameters

Power control parameters

Admission and congestion control

Common control channel powers

Etc.

AA d


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AgendaAgenda




l RF Optimisation



l Summary

R l T ti & St t A l i (1/4)R l T ti & St t A l i (1/4)


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

Cluster of sites

ready?


Re-optimisation

Needed?

No

NoYes

RF Optimisation


Services Testing &

Parameter Optimisation



Yes

R l T ti & St t A l i (2/4)R l T ti & St t A l i (2/4)


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l Optimisation is an on-going activity and as a result:

Regular drive tests of designated routes should be carried out

(e.g. on monthly basis)

Routine analysis of network stats to identify any reduction in

network performance



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l Regular Drive Testing- Objectives:

To benchmark network performance and user experience (e.g.

call setup SR, call drop rate, PS throughputs, etc)

To identify any degradation in coverage and/or increase in

interference as a result of increased traffic or changes in

environment To assess impact of newly introduced RAN features.

To monitor the progress of on-going optimisation activities.



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l Routine Network Stats analysis - Objectives:

To benchmark network performance, particularly during the

busy hour.

To monitor traffic volumes and patterns as well as traffic profiles

(i.e. mix of services).

To assess impact of parameter changes as part of parameter

optimisation exercises.

To identify poorly performing cells that need investigation to

establish underlying cause of poor performance.

To provide triggers for network upgrade decisions.

AgendaAgenda


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AgendaAgenda




l RF Optimisation



l Summary

Optimisation Approach OverviewOptimisation Approach Overview


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Optimisation Approach OverviewOptimisation Approach Overview

Cluster of sites

ready?


Re-optimisation

Needed?

No

NoYes

RF Optimisation





Yes


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Thank you!

89025817 huawei optimisation process

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