Huawei ion Process

UTRAN Optimisation Process

Agenda l

Introduction and Objectives

l

Optimisatio Optimisation n Phases Phases Overview Overview

l

Single Site Verification

l

RF Optimisation

l

Services Testing & Parameters Optimisation

l

Regular Reference Routes & Stats Analysis

l

Summary

Agenda l


l

Optimisatio Optimisation n Phases Phases Overview Overview

l


l

RF Optimisation

l


l


l

Summary

Introduction & Objectives 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

Agenda

l


l

Optimis Optimisati ation on Phases Phases Overvi Overview ew

l


l

RF Optimisation

l


l


l

Summary

Optimisation Optimisation Approach Approach Overview (1/3) [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 (2/3) [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 (3/3) New Sites Integrated


Cluster of sites ready?

No

Yes

RF Optimisation Services Testing & Parameter Optimisation

Regular Reference Route Testing & Stats Analysis

Yes

Re-optimisation Needed?

No

Agenda

l


l

Optimisation Phases Overview

l


l

RF Optimisation

l


l


l

Summary

Single Site Verification (1/3) New Sites Integrated



No

Yes



Yes


No

Single Site Verifications (2/3) l

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

Tools: è

l

Scanner + UE

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) An example Check list

l

Reminder Data Base Update □ Mapinfo Update □

Site Checklist Site ID: New Site: Site Expansion: Site Migration: Others: No. e d o M e l d I

d o M n o i t c e n n o C

S P

r e v o d n a H n e G

Site Name: Site Connected to RNC: Site Expanded from: Site Migrated from RNC:

□ □ □ □

Activity/Process

1 Frequency and Scrambling Code correctly defined □ 2 Cell selection and reselection parameters are as planned ( SIB 3 ) □ 3 The LAC/RACis correctly defined ( SIB 1 ) □ 4 The neighbor list and parameters are as planned ( SIB 11 ) □ 5 LA update proceduce is checked □ 6 Cell reselection from3G to 2G is checked □ 7 Cell reselection from2G to 3G is checked □ 8 MO-SMS and MT-SMS □ 9 CPICH_RSCP > -85 dBm near site □ 10 CPICH_EcIo > -8 dB near site □ 11 Mobile terminating calls and mobile originating calls for voice service is che □ 12 The voice service quality is good by the engineer feeling □ 13 Mobile terminating calls and mobile originating calls for VP service is check □ 14 The VP service quality is good by the engineer feeling □ 15 PS attach is checked □ 16 PS detach is checked □ 17 PS PDPactivation anddeactivation is checked □ 18 The PS service quality is good by the engineer feeling □ 19 RA update proceduce is checked □ 20 Soft handover for voice service to and from the 3G cells checked OK □ 21 Soft handover for VP service to and from the 3G cells checked OK □ 22 Soft handover for PS service to and from the 3G cells checked OK □ 23 Inter-systemhandover for voice service to the 2G cells checked OK □ 24 Installed antennais of the planned type □ 25 Overall performance and coverage area as expected by a brief drive test □ 26 Antenna Swapping Test □

o: o RNC: New

Expansion

□ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □

Migration

□ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □

□ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □ □

Others

Remarks (Further comments): Checked by: 1-Name/Designation:

Signature:

Data:

2-Name/Designation:

Signature:

Data:

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 ' □'.

Remarks

Agenda l


l


l


l

RF Optimisation

l


l


l

Summary

RF Optimisation New Sites Integrated



No

Yes



Yes


No

RF Optimisation – Intro (1/2) l

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

Tools: è

l

Scanner + UE with logging tool

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.

RF Optimisation – Intro (2/2) Start l

Process Flow: Drive Test Identify any RF Issues Identify candidate cells for changes Identify nature of required changes

Determine amount of change Implement changes

Repeat Drive Test

No

Problem Resolved? Yes End

Data Analysis

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


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


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 Ec/Io Plot

CPICH RSCP Plot


Analysis of UL Coverage:

To identify: l

Uplink coverage limitation (i.e. UE reaching max Tx power)

UE Tx power.


Analysis of Pilot Pollution:

To identify: l

Cells causing pilot pollution

l

Locations where there are too many soft handoff candidates

SC 8 9 10 11 12 13 16 17 18 19 20 21 32 35 37 43 48 53 67 80 130

Count 206 165 157 156 148 135 95 94 76 74 73 56 54 39 33 19 8 7 3 2 2

% in Pollution Set 12.9% 10.3% 9.8% 9.7% 9.2% 8.4% 5.9% 5.9% 4.7% 4.6% 4.6% 3.5% 3.4% 2.4% 2.1% 1.2% 0.5% 0.4% 0.2% 0.1% 0.1%

Pilot pollution results

Estimated active set size from scanner data.


Analysis of Neighbour List:

To identify: l

SC

Cell

Site

La ti tud e

Lo ng itu de

009

70548

Ajman Central

25.41204

55.447

Sample Action Count 576

Any missing neighbours though analysis scanner data & RNC neighbour list

l

Any missing neighbours causing drop calls

l

Any unnecessary neighbours.

Neighbour list verification.

Retain Retain Retain Retain Retain Add Retain Retain Retain Retain Retain Remove Remove Remove Remove Remove Remove

Nbr SC

Sample Count

%

018 010 016 032 011 130 021 008 020 012 017 053 019 034 037 013 051

82 46 31 20 18 17 17 12 6 5 2 0 0 0 0 0 0

14.2% 8.0% 5.4% 3.5% 3.1% 3.0% 3.0% 2.1% 1.0% 0.9% 0.3% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%


Analysis of SHO Performance: Number of Active Set Updates

To determine soft hand off success rate.

Event Count Event 1a 328 Event 1b 306 Event 1c 64

Number of Active Set Update Completes Event Count Event 1a 326 Event 1b 305 Event 1c 62

Soft-Handover Success Rate Event Rate Event 1a 99.4 Event 1b 99.7 Event 1c 96.9

Scrambling Code plot of best serving cells


Analysis of Drop Calls:

To identify: l

Exact cause of the drop calls

Drop calls

RF Optimisation – Solutions l

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

Neighbour List Optimisation: (in order of priority ) è

Add missing neighbors

è

Remove unnecessary neighbors

RF Optimisation – Process Summary

Analysis Drive test data (scanner + UE)

Dominance

Best server scrambling code

CPICH Coverage

CPICH RSCP & Ec/Io

DL Interference

CPICH Ec/Io

UL Coverage

UE Tx power

Neighbour List

Scanner vs. RNC neighbours

Pilot Pollution

Scanner active set size

Drop calls

Causes analysis

Neighbour list

Thresholds & KPIs

Antenna & Site Optimisation

Neighbour List tuning

Agenda l


l


l


l

RF Optimisation

l


l


l

Summary

Services Testing & Parameter Optimisation (1/6)

New Sites Integrated



No

Yes

RF Optimisation Services Testing & Parameter Optimisation Regular Reference Route Testing & Stats Analysis

Yes


No

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 Determine (Non-RF) Failure Causes

Yes

100 % Success Rate? No System Defect?

Yes

Raise Defect

No

Improve via Parameters? No End

Yes

Optimise Parameters


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


Candidate Parameters

Clutter & Environment factors

Define Test Cases & select drive routes

Perform Tests Trade Offs

Data Analysis & Conclusions

Parameters Ranges

Analysis Metrics


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.

Agenda l


l


l


l

RF Optimisation

l


l


l

Summary

Regular Testing & Stats Analysis (1/4) New Sites Integrated



No

Yes

RF Optimisation Services Testing & Parameter Optimisation Regular Reference Route Testing & Stats Analysis

Yes


No

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)

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) 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.

Agenda l


l


l


l

RF Optimisation

l


l


l

Summary

Optimisation Approach Overview New Sites Integrated



No

Yes



Yes


No

Huawei ion Process

Recommend Documents