Network Optimization Principles

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    1 2006 Nokia 13-468258 v1.0

    Company Confidential

    RANOP Radio Network

    Optimization

    RANOP / 2006

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    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

    Case

    Studies

    P

    ractic

    alExam

    ples

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    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

    INTE

    R-ACT

    IVE

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    Maximize network quality :

    as perceived by the subscriber

    as perceived by the operator

    Balance investment versus achieved quality

    What is Network Optimization?

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    What is Network Quality ?

    O

    P

    E

    RA

    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

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    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

    RA

    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

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    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 !

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    Changing Targets

    Weight of quality targets changes in time :

    Quality

    Capacity

    Coverage

    Time

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    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

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    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.

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    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

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    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.

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    Lets optimize!!!

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    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

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    OPTIMIZATION EXAMPLE

    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%

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    OPTIMIZATION EXAMPLE

    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

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    OPTIMIZATION EXAMPLE

    5. CONFIGURATION ANALYSIS

    Operator A checks theparameters consistency and allthe parameters are according toplanned

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    OPTIMIZATION EXAMPLE

    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 goodThere is still room to reduce power in

    ULMore aggressive UL PCsettings

    Enable MS PowerOptimization feature

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    OPTIMIZATION EXAMPLE

    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.

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    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? Hasnt everything been done

    during planning phase?

    NO!