Root Cause Analysis for Key Performance Indicators (KPI) from Ericsson

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Chunl1
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Root Cause Analysis for Key Performance Indicators (KPI) from Ericsson

Postby Chunl1 » 27 Dec 2016, 06:54

List of Contents
1. Structure of the document_________________________________________________________4
2. Random Access (RACH) Success_____________________________________________________5
2.1 Define_______________________________________________________________________________5
2.2 Measure_____________________________________________________________________________5
2.2.1 STS Counters and stats for monitoring Random Access Failure____________________________________5
2.2.2 STS Counters for monitoring the RA request type________________________________________________6
2.3 Analyze______________________________________________________________________________6
2.3.1 Fish Bone diagram for the root cause analysis of poor Random Access Success________________________6
2.3.2 Description of the root causes for poor RA Success Rate___________________________________________6
3. Paging (PCH) Success______________________________________________________________8
3.1 Define_______________________________________________________________________________8
3.1.1 Paging Process_____________________________________________________________________________8
3.1.2 Paging Capacity and Paging Group at the RBS__________________________________________________9
3.1.3 Paging Capacity at the BSC_________________________________________________________________10
3.1.4 Paging Strategies and MSC paging timers_____________________________________________________11
3.2 Measure____________________________________________________________________________12
3.2.1 STS counters and stats for measuring Paging performance_______________________________________12
3.2 Measure____________________________________________________________________________15
3.2.1 Fish bone diagram for the root cause analysis of poor Paging Success Rate__________________________15
4. Location Area updating (success rate)________________________________________________18
4.1. Define______________________________________________________________________________18
4.1.1. Location Area updating process_____________________________________________________________18
4.2. Measure____________________________________________________________________________18
4.2.1. Location Area Dimensioning (from paging capacity point)_______________________________________18
4.3 Analyze_____________________________________________________________________________21
4.2.1 Fish bone diagram for the root cause analysis of poor Location Area Updating_______________________21
5. SDCCH Congestion Rate___________________________________________________________23
5.1. Define______________________________________________________________________________23
5.1.1 Load in mErlang on SDCCH due to different events_____________________________________________23
5.2. Measure____________________________________________________________________________24
5.2.1 Traffic Theory____________________________________________________________________________24
5.2.2 STS counters for measuring SDCCH congestion Rate____________________________________________24
5.3 Analyze_____________________________________________________________________________25
5.3.1 Fish bone diagram for the root cause analysis high SDCCH congestion rate_________________________25
6. SDCCH Drop Rate________________________________________________________________27
6.1 Define______________________________________________________________________________27
6.2 Measure____________________________________________________________________________27
6.2.1 SDCCH Drop Rate_________________________________________________________________________27
6.2.2 SDCCH Drop Reason______________________________________________________________________27
6.3 Analyse_____________________________________________________________________________28
6.3.1 Fish bone diagram for the root cause analysis for high SDCCH drop rate___________________________28
7. TCH Congestion Rate_____________________________________________________________30
7.1 Define______________________________________________________________________________30
7.2 Measure____________________________________________________________________________30
7.2.1 STS counters and stats for TCH Congestion Rate_______________________________________________30
7.3 Analyze_____________________________________________________________________________31
7.3.1 Fish bone diagram for the root cause analysis for high TCH Congestion Rate________________________31
7.3.2 Half Rate Parameters______________________________________________________________________32
7.3.3 Mean Opinion scores for Half Rate___________________________________________________________33
7.3.4 Why Quality is so important?________________________________________________________________34
7.3.5 Parameters controlling CLS_________________________________________________________________35
7.3.6 Parameters controlling HCS_________________________________________________________________37
7.3.7 Parameters controlling Assignment to another cell______________________________________________38
8. TCH Drop Rate__________________________________________________________________40
8.1 Define______________________________________________________________________________40
8.2 Measure____________________________________________________________________________40
8.2.1 STS counters for TCH drop_________________________________________________________________41
8.3 Analyze________________________________________________________________________42
8.3.1 Fish bone diagram for the root cause analysis for high TCH Drop Rate______________________42
8.3.2 Power control parameters for MS____________________________________________________________46
8.3.3 Power control parameters for BS_____________________________________________________________46
9. Handover_______________________________________________________________________47
9.1 Define______________________________________________________________________________47
9.2 Measure____________________________________________________________________________47
9.2.1 STS counters and stats for handover performance_______________________________________________47
9.3 Analyze_____________________________________________________________________________48
9.3.1 Fish bone diagram for the root cause analysis for high handover failure rate_________________________48
9.3.2 E1 Algorithm for Locating (EVALTYPE=1)___________________________________________________49
9.3.3 E3 algorithm for Locating (EVALTYPE=3)____________________________________________________50
9.3.4 Urgency condition handover trigger parameters________________________________________________50
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l3p15
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Re: Root Cause Analysis for Key Performance Indicators (KPI) from Ericsson

Postby l3p15 » 02 Jan 2017, 16:39

Thanks 4 sharing gan..

//L3p15





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