introduction to umts radio kpi

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Introduction to UMTS Radio KPI

3G network planning introduce www.huawei.com

Huawei Northwest Africa Region

RNP Solution Manage:

William.chen

[email protected] HUAWEI TECHNOLOGIES CO., LTD.

PDF created with pdfFactory Pro trial version www.pdffactory.com

Agenda

UMTS Radio KPI overview

3G Network Optimization

Case Study of KPI Optimization

HUAWEI TECHNOLOGIES CO., LTD.


3G KPIs Principle: S.M.A.R.T

the KPI has clear and complete definition and Specific formula, include check point and procedure. KPIs are

measurable by given condition, Measurable

measurement equipment and procedure. all the KPIs should

be reachable, it is refer to the Attainable

commercial network.

Relevant the KPI can show the subscriber experience

Time-bound the KPI target should be on the base of time-bound



3G KPIs : Specific

Complete KPI definition include the formula combine with the check point or procedure.

The example: RRC Connection Successful Rate

formula RRCConnect ionSuccess

service RRCS_SR = ×100% Service RRCConnect ionAttempt

service

Check point

The number of “RRC Connection Attempt” is A1 or A2?

A2 represent the effective number of “RRC Connection Attempt”.



3G KPIs : Measurable - Drive Test

Driver test route is based on Field Test -> Drive Test cluster, it is involved about 20

Evaluate the overall network sites in one cluster usually. performance, usually on the network pre-launch phase and initial stage of commercial launch.

Test platform

Multiple test model UEs can perform different tests.

Data analysis

Probe & Assistant is used for analyzing test data



3G KPIs : Measurable - Stationary test

System KPI is suggested to be Field Test ->stationary Test test by stationary:

Evaluate the system / equipment performance. Throughput KPI

Delay KPI

Quality KPI Core Network

Stationary test condition is fixed, NodeB and usually used in indoor test

scenario.

RNC

NodeB Radio Network KPI test is suggested to be test by drive test System performance Radio Network

performance Call drop rate Equipment ability

Handover successful rate Radio network Transmission planning

Network construct Special environment …. condition



3G KPIs : Measurable - Statistic test

Statistic Test

Nastar server

Monitoring & analysis center

Recommended for security Essential Optimization team

OM system

Pre-Condition for Statistic Test Subscriber care center

There must be enough statistic sample, that Terminal: ordinary PC or laptop, no distance mean network traffic should be reach high limitation

level. Local networks Any corresponding dept.



Huawei KPI test platform

comprehensive analysis of the iManagerTM M2000 performance, configuration, alarm obtaining test data

GENEX Nastar 3G

sharing of analysis results Node B

RNC GENEX Probe

GENEX Assistant AGILENT 3G Node B

QUALCOMM HLR/AC multiple test data

HUAWEI RNC Node B

RNS

PSTN GENEX Probe MSC/SSP/ PLMN

WCDMA wireless test data ISDN VLR Node B

RNC GMSC/SSP

CN GENEX U- Node B

Net Node B RNS

network pre-planning/planning



3G KPIs: Relevant Examples of User Experience (QoE)

completion of a End-to-end response The voice and video download file is fast is Clare

Voice, Video Phone, MMS, WAP, Email, FTP, HTTP… Service Performance

Radio Network KPI AMR12.2, CS64k,PS64k/128k/384k, HSDPA/HSUPA

Accessibility Retainability Integrity Mobility Utilization Availability

Statistic / Measurement data



Huawei 3G KPIs Architecture

3G KPIs

Accessability Retainability Service Integrity Mobility Delay/Latency Availability

• Call Setup • Call Drop • PS Throughput • SHO • Call Setup Delay • Worst Cell Success Rate Rate Success (Voice/VP) Rate (Voice/VP) (Voice/VP) Rate

• PDP Context • PDP Context • PDP • Hard Activation Time Activation Context Handover

• RTT Success Rate Drop Rate Success

Rate • SMS/MMS Success Rate • Inter-RAT

Handover Success Rate



3G KPIs: It is not only a value

3G KPI is not only a value, but a system, for example of CDR (Call Drop Rate)

Network Planning Network Construct Transmission optimization

Root cause drop-call

cause 59.45% 10.02% 7.29% 4.56% 0.68% 0.68% 3% 2.28% 11.94%



3G KPIs: Attainable

3G KPI is output of combination with investment include technology, HR, cost, competition strategy etc. Cost

Huawei KPI comply principle:

Huawei will be responsibility for every complied KPI; le Cooperate with Mobilis to work out a Competitive KPI; t Use the experience from other commercial network;

Technical AttainableCommon target for Mobilis and Huawei



3G KPIs: Time-bound Mature Network

10 90

80 Drive Test KPIs 70 60

50 Ongoing Optimization 40 30 Stationary test KPIs 20 10

Number of Sites Number of Sites Network Statistics

Network Statistics Commercial Launch Benchmark test Nastar

Probe & Assistant Probe & Assistant

Pre-Launch Probe & Assistant KPI Acceptance

Drive Test KPIs Stationary test KPIs

Network construct Site verification



Recommend test methodology

Test Methodology Pre-launch Acceptance On-going Optimization

RRC connection success rate Drive Test -

Call setup success rate Drive Test Statistic Test

PDP activation success rate Drive Test Statistic Test

CS Call drop rate Drive Test Statistic Test

PS Call drop rate Drive Test Statistic Test

CS Call complete rate - Statistic Test

PS Call Complete rate - Statistic Test

HSPA Call drop rate Stationary Stationary

R99 PS Throughput Stationary Stationary

HSPA Throughput Stationary Stationary

Soft handover success rate Drive Test Statistic Test

Inter-RAT handover success Drive Test Statistic Test

rate



Contents

• UMTS Radio KPI overview •3G

Radio Network Optimization •




Optimization throughout Life Cycle

•RF adjustment Drop call

•Para. adjustment Congestion

•Maintenance and upgrade Poor quality

•Contingency planning Access failure

•Network expansion Pre-launch optimization ……

•…….

Customized and differentiated services

Single site verification Billing strategies

Return Investment

RF plan review DT & CQT KPI Complaints analysis

Construction Booming phase Mature phase Time Commercia phase

Optimizing Balancing l launch Troubleshooting



Network Optimization Phases

Optimization

preparation RF optimization

Service test and New site integrated parameter optimization

Routine drive test and stats. analysis

Single site verification

Acceptance criteria N satisfied?

Y 80 ％ sites in the Y

N cluster ready?

Acceptance



RF Optimization Target

To optimize coverage To

minimize pilot pollution To

optimize cell dominance To

optimize neighbor cell list To

resolve RF-related drop calls



RF Parameters Optimization

Engineering parameters adjustment

To adjust antenna down tilt

To adjust antenna azimuth

To adjust antenna location

To adjust antenna height To

replace antenna To replace

site To add new cell

Radio part parameters adjustment

To optimize neighbor cell list



Pilot Pollution Minimization Pilot pollution definition:

Pilot pollution will result in: SHO candidates (A) (1) low signal quality

Active set size (B) (2) decreased system

If A>B, pilot pollution exists capacity

(3) Call drops easier

-60

-65 Margin

-70 Ways to optimize:

(1) Antenna adjustment -75 -62 -64 -66 (e.g. azimuth or down tilt) -68 -69 -80 (2) Pilot power optimization

-85 -81

-90 SC1 SC2 SC3 SC4 SC5 SC6

Not Active Set Pilot Pollution Pilot Pollution



Pilot Pollution: Example



RF-related Drop Calls

Problems Appearance

Poor coverage Poor RSCP & Ec/Io

High interference Poor Ec/Io or RTWP

Poor UL coverage UE max Tx power

Poor dominance many SHO events

Pilot pollution many cells present

Missing neighbors

Fast change of RF conditions usually causes drop calls, e.g. turning a corner.



Para. Optimization Target

Para. optimization To reduce access failures is an important step

after RF optimization To reduce drop calls

To enhance service quality

Service quality and network resources utilization will be improved after para. optimization



Parameters to be Optimized

CCCH power allocation para.

RL maximum power para. Seldom adjusted Cell re-selection para.

Intra-freq. handover para.

An effective way to Inter-RAT handover para. reduce drop calls

Power control para.

Access power para. The influence caused by the cell parameters adjustment

Other related para. should be analyzed carefully.



Intra-freq. Re-selection Para.

Optimize Treselection, Qhysts and Sintrasearch so as to have minimum ping-pong and minimum camped onto wrong cell

The black dotted line Qhyst2 CPICH_Ec/Io is the serving cells. CPICH_Ec/Io

Qhyst2 Qhyst2

Qhyst2

Qhyst2

The black dotted line

UE doesn’t camp is the serving cells.

onto the best cells. Sintrasearch UE doesn’t camp

onto the best cells. Qqualmin

Qqualmin

Treselection Treselection Treselection Treselection

Treselection Treselection Time

Treselection, Qhyst2, Sintrasearch = 0 Treselection, Qhyst2, Sintrasearch != 0



Contents

• UMTS Radio KPI overview •3G

Radio Network Optimization •




Case study from commercial projects

• Example of Accessibility KPI analysis •

Example of Call Drop KPI issue & solution •

Example of Throughput KPI issue analysis



Example of accessibility KPIs issue

Trouble-shooting of RRC setup and RAB assignment Breakdown of CS RAB failure (Counters)

problems: VS.RAB.FailEstCS.I VS.RAB.FailEstabCS. VS.RAB.FailEstPS.

• STEP1: Identify the counter with the UB.Band Other.Cell RIPFail highest number

• STEP2: Identify the Top 10 cells with Breakdown of CS RRC failure (Counters) the same problem

VS.RRC.Rej.R VS.RRC.Rej.Cod VS.RRC.Rej.UL.C RRC.FailConnEstab. Definition of Counters

L.Fail e.Cong E.Cong NoReply VS.RAB.FailEstPs.IUB.Band: The number of RABs unsuccessfully established in a cell due to IUB resource congestion causes. • VS.RAB.FailEstabCS.Other.Cell: • VS.RRC.Rej.UL.CE.Cong: RRC

Pre-admission control module reports setup failure due to lack of UL CE a resource congestion. resources



Analysis

The “worst” sites (cells) that have been found to have both IUB and CE congestion issues:

0109TO (cell id 578/579/580) 0111TO (3882/3883/3884) 0070TO (18641/18642/18643)

NodeB UL CE Occupation Rate Name

2007-02-19 2007-02-20 2007-02-21 2007-02-22

0070TO 120.83% 132.29% 132.29% 171.88%

0109TO 142.71% 175.00% 175.00% 180.21%

0111TO 158.33% 132.29% 132.29% 148.96%



Suggested solution

A comparative analysis shows that, if excluding the problematic sites, the KPI would improve substantially, say, AMR RAB assignment success rate from 97.79% to 98.09%:

KPIs (including IUB KPIs (without IUB

Congestion sites) Congestion sites)

RRC Connection Setup Success 99.17%(313992/316615) 99.35%(256449/258126)

Rate (CS)(>98%)

AMR RAB Assignment Success Suggested action plan: 97.79%(294499/301169) 98.09%(241127/245815)

Rate(>98%) • CE/IUB expansion

Video Call RAB Assignment 98.31%(3314/3371) 98.67%(2891/2930) • Perform regular neighbour list

Success Rate(>98%) check to further tune the

PS64 RAB Assignment Success performance 84.93%(2462/2899) 83.10%(1981/2384)

Rate(>97%)

PS128 RAB Assignment 98.48%(16674/16932) 98.80%(13638/13803)

Success Rate(>97%)

PS384 RAB Assignment 97.53%(58114/59584) 97.81%(48854/49946)

Success Rate(>97%)






Example of Throughput KPI issue analysis



Example of Call drop rate issues

Drop Call Rate Voice(3G) Drop Call Rate Video(3G) AMR12.2 Call Drop Rate Drop Call Rate (2G)

3.5% Voice call drop rate 3.0%

2.5% changes over a three-

2.0% month optimization 1.5% period 1.0%

0.5%

0.0%

Zone1 Zone2 Solving Voice call drop Zone3

rate problems in Top 3 zones



What measures were taken to solve the call drop problems?

Zone Action time Call drop rate Optimization measures reduction

Zone 1 Feb. 14-17 1.57%->1.27% Scrambling code planning adjustment System/handover

Zone 2 Feb. 23-25 1.38%->1.21% parameter tuning Neighbour list optimization RF optimization, etc.

Zone 3 Mar.2-6 1.34%->1.10%






Example of Throughput issue analysis



Analysis: coverage problems

RNC 123

RNC 122

Areas that lack dominant pilot

Drive test route involves 3 Huawei RNCs and 1 Nortel RNC

RNC 121



The impact of missing neighbours

• DL R99 throughput has been impacted by the interference generated by missing neighbors, mostly concerning the new sites that had been recently put on air

• Areas with low throughput corresponds to bad Ec/Io figures and HHO to 2G

Low throughput

UE handover to GSM



Other causes

In addition to coverage and missing neighbour causes, the HSDPA minimum throughput problem is due to:

• DT route crosses the IUR area where HSDPA calls are reconfigured to DCH (H2D)

• UE moves from a non-hotspot to a hotspot site in HSDPA connected mode

RNC 122 RNC 123 RNC 122

RNC 123

RNC 121 RNC 121



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introduction to umts radio kpi

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