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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
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
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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
I N T E
R - A C T
I V E
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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
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
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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
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
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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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Let’s 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 goodÆThere is still room to reduce power in
ULMore aggressive UL PCsettings
Enable “MS Power Optimization” 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? Hasn’t everything been done
during planning phase?
NO!