【資料名稱】：Root Cause Analysis for Key Performance Indicators (KPI)

【資料作者】：Ericsson

【資料日期】：2006

【資料語言】：中文

【資料格式】：PDF

【資料目錄和簡介】：

Root Cause Analysis for Key Performance Indicators (KPI) for GSM Networks


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