Download - Network Optimization Principles

7/27/2019 Network Optimization Principles

http://slidepdf.com/reader/full/network-optimization-principles 1/22

1 © 2006 Nokia 13-468258 v1.0

Company Confidential

RANOP – Radio Network

Optimization

RANOP / 2006



2 © 2006 Nokia 13-468258 v1.0


Contents of RANOP

• Network Optimization Principles

• Quality indicating Figures

• Network Configuration Optimization

• Parameters

• Consistency Checks

• Examples of wrong parameters set in the network

• Network Performance Optimization• Counters, KPIs

• Statistics, Drive Test, Customer Complaints

• Network Optimization Processes• Using Fault Management for Network Optimization

• Alarms

C a s e

S t u d i e s

P

r a c t i c

a l E x a m

p l e s



3 © 2006 Nokia 13-468258 v1.0


Objectives

• Objectives

• Provide background knowledge to optimize GSM networks

• Calculate performance indicating figures

• Relate optimization processes

• Learn from experience with case studies and examples

• Relate useful tools for optimization

• Non-objectives

• No specific BSS parameter training (this is done in BSSPAR Course)

• No hands-on NetAct training

I N T E

R - A C T

I V E


http://slidepdf.com/reader/full/network-optimization-principles 4/224 © 2006 Nokia 13-468258 v1.0


• Maximize network quality :

• as perceived by the subscriber

• as perceived by the operator

• Balance investment versus achieved quality

What is Network Optimization?




What is Network Quality ?

O

P

E

R A

T

O

R

C

U

S

T

O

M

E

R

NETWORK

SERVICES

MOBILE

COST

• Mail Box, Data, Fax• HSCSD, GPRS, WAP

• Customer Care

• Faulty H/W or S/W• Mobile Quality• Misuse of Equipment

• H/W Failure• Network Configuration• Network Traffic• Spectrum Efficiency

• Coverage yes/no• Service Probability• Quality• Call Set Up Time• Call Setup Success Rate• Call Completion Rate

• H/W Costs• Subscription/Airtime costs• Additional Services Costs

• Network Equipment Costs• Maintenance Costs

• Site Leasing Costs• Transmission Link Costs




What is Network Quality ?

NETWORK

• H/W Failure

• Network Configuration• Network Traffic• Spectrum Efficiency

• Coverage yes/no• Service Probability• Quality• Call Set Up Time• Call Setup Success Rate• Call Completion Rate

O

P

E

R A

T

O

R

C

U

S

TO

M

E

R

SERVICES

MOBILE

COST

• Mail Box, Data, Fax

• HSCSD, GPRS, WAP• Customer Care

• Faulty H/W or S/W• Mobile Quality• Misuse of Equipment

• H/W Costs• Subscription/Airtime costs• Additional Services Costs

• Network Equipment Costs• Maintenance Costs• Site Leasing Costs• Transmission Link Costs



7 © 2006 Nokia 13-468258 v1.0


Who sets the targets ?

• Quality targets could be set by :

• General director

• Marketing director

• License obligations via regulator

• Competitors

• Customer complaints

• …..

• Quality targets are NOT set by network optimisation engineers !



8 © 2006 Nokia 13-468258 v1.0


Changing Targets

• Weight of quality targets changes in time :

Quality

Capacity

Coverage

Time



9 © 2006 Nokia 13-468258 v1.0


How to monitor the network?

• Three main forms to monitor and detect the needs of optimization:

Customer Complaints

• Can detect problems in certain

regions that are masked by statistics.

• A bit too late!!!

Customer Complaints

• Can detect problems in certain

regions that are masked by statistics.

• A bit too late!!!

Field Tests

• Geographically locate problems

• Supplies mostly DL information• Expensive and time consuming!

Field Tests

• Geographically locate problems

• Supplies mostly DL information

• Expensive and time consuming!

OSS

• Nokia NetAct (Network Management

System)

• Allows centralized data collection

• A cost efficient way to monitor

network quality

OSS

• Nokia NetAct (Network ManagementSystem)

• Allows centralized data collection

• A cost efficient way to monitor

network quality



10 © 2006 Nokia 13-468258 v1.0


Before starting the optimization …

• Actual Network Status:

• Status of the network, actual performance

• Target Performance:

• Defining the parameters that will serve to determinate the grade of success of the

optimisation

• Can be based on Key Performance Indicators (KPIs) from statistics and,optionally, on Drive Tests results.



11 © 2006 Nokia 13-468258 v1.0


Pre-Optimization Issues …

• Scope:• Radio, Core or Transmission Optimization

• Work scope is data analysis and change proposal, or includes collecting data(statistics and drive tests) and implementing the changes (software and/or hardware).

• Target Area:• Geographical area included in the project, number of BSCs and sites

• Timeframe:

• Timeframe for the completion of the project

• Methodology:

• Arranging the reporting

• The process to implement the Change Requests

• Tools:• Choice and preparation of all the necessary tools to develop the optimisation process



12 © 2006 Nokia 13-468258 v1.0


Pre-Optimization Issues …

• Share Of Responsibilities;

• Agreeing who (Nokia or the Operator) is responsible for every task

• Project Organization:

• Organisation of the whole project team, resource dimensioning

• Features and Strategies:

• Features that are currently in use, and what others can be implemented if needed in

order to improve the target indicators (E.g. Half Rate, Dynamic SDCCH etc.)

• Operator HO/Adjacency, Traffic, GPRS strategy in order to check if the parameters arecorrectly set for that purpose

• Software or hardware upgrades:

• How to deal with them.



13 © 2006 Nokia 13-468258 v1.0


Let’s optimize!!!



14 © 2006 Nokia 13-468258 v1.0


OPTIMIZATION EXAMPLE

1. QUALITY DEFINITION

• The operator should define what is “quality” according to its focus

To offer much coverage as possible

To maintain the best speech quality

Etc.

Quality?

Operator A wants to offer the bestspeech quality



15 © 2006 Nokia 13-468258 v1.0



2. QUALITY TARGETS

• Based on the quality definition the targets to achieve should be defined

accordingly, e.g:

DCR < x% (e.g2%)

(% samples having RxQual > 4)< x

Call success setup ratio >

x%

(% samples having FER > y)

< x

Operator A sets:

• DCR < 2%

• (% samples having FER >5%) < 5%



17 © 2006 Nokia 13-468258 v1.0



4. ALARM ANALYSIS

• Faulty behaviors should be detected since they may prevent the network from

accomplishing the quality targets

• The basic monitoring tasks may include:

Alarm monitoring

Real time traffic monitoring and troubleshooting

Operator A monitors the alarmsand no critical alarms are found.

New parameters or functionalities

have not been activated lately



18 © 2006 Nokia 13-468258 v1.0



5. CONFIGURATION ANALYSIS

Operator A checks theparameters consistency and allthe parameters are according toplanned



20 © 2006 Nokia 13-468258 v1.0



7. CHANGE REQUEST

Objective: ReduceDCR

Reduce interference

DCR due toradio

reasons(interference)

In UL the quality is much better than inDL and RXLEV values are goodÆThere is still room to reduce power in

ULMore aggressive UL PCsettings

Enable “MS Power Optimization” feature



21 © 2006 Nokia 13-468258 v1.0



7. QUALITY IMPROVEMENT

• After the changes have been made the next phase is to start monitoring the

network (back to step 3!) to check if there is some negative impact and continue

the “Network Optimization Cycle” again.

The second option is chosen to

ensured that the transmission atmaximum power is reduced as muchas possible.



22 © 2006 Nokia 13-468258 v1.0


Lastly …

• Parameters set during the planning phase must be reviewed

according to network statistics

• As number of users increase, network expansions must beconsidered as well as new strategies

• Frequency plan may have to be altered in order to avoid

interference and network quality degradation during network

growth

Why optimize a network? Hasn’t everything been done

during planning phase?

NO!