W-Handover and Call Drop Problem Optimization

[xsdenied07]

Dear all,

W-Handover and Call Drop Problem Optimization Guide.
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Contents:-

1 Introduction .............................................................................................................................14
2 Handover and Call Drop Performance Indexes......................................................................16
2.1 Handover Performance Indexes ......................................................................................16
2.2 Call Drop Performance Indexes.......................................................................................19
3 Handover Index Optimization .................................................................................................20
3.1 DT/CQT Index Optimization Flow.....................................................................................20
3.1.1 SHO DT Index Optimization Flow...........................................................................20
3.1.2 HHO CQT Flow .....................................................................................................24
3.1.3 Inter-RAT Handover CQT Flow..............................................................................27
3.1.4 DT/CQT Flow for HSDPA Handover ......................................................................29
3.1.5 DT/CQT Flow for HSUPA Handover ......................................................................32
3.1.6 SHO Ratio Optimization.........................................................................................32
3.1.7 MBMS Mobility Optimization ..................................................................................32
3.2 Traffic Statistics Analysis Flow.........................................................................................34
3.2.1 Analysis Flow for SHO Traffic Statistics .................................................................35
3.2.2 Analysis Flow of HHO Traffic statistics...................................................................36
3.2.3 Traffic Statistics Analysis Flow for Inter-RAT Handover..........................................37
3.2.4 Traffic Statistics Analysis for HSDPA Handover .....................................................40
3.2.5 Traffic Statistics Analysis for HSUPA Handover .....................................................41
3.3 SHO Cost Optimization....................................................................................................43
4 CDR Index Optimization..........................................................................................................44
4.1 Definition of Call Drop and Traffic Statistics Indexes ........................................................44
4.1.1 Definition of DT Call Drop ......................................................................................44
4.1.2 Descriptions of Traffic Statistics Indexes ................................................................44
4.2 DT/CQT Optimization Flow..............................................................................................45
4.2.1 Call Drop Cause Analysis ......................................................................................46
4.2.2 Frequently-adjusted Non-handover Algorithm Parameters......................................48
4.2.3 Judgment Tree for Call Drop Causes .....................................................................49
4.3 Traffic Statistics Analysis Flow.........................................................................................50
4.3.1 Analyzing RNC CDR..............................................................................................51
4.3.2 Analyzing Causes to Call Drop...............................................................................51
4.3.3 Check Cells ...........................................................................................................52
4.3.4 Further DT for Relocating Problems.......................................................................52
4.4 Optimization Flow for Tracing Data..................................................................................52
4.4.1 Obtaining Single Subscriber Tracing Message .......................................................53
4.4.2 Obtaining Information about Call Drop Point ..........................................................53
4.4.3 Analyzing Call Drop due to SRB Reset ..................................................................54
4.4.4 Analyzing Call Drop due to TRB Reset...................................................................54
4.4.5 Analyzing Abnormal Call Drop ...............................................................................54
4.4.6 Performing CQT to Recheck Problems ..................................................................55
4.5 Optimization Process for MBMS Call Drop.......................................................................55
5 FAQs Analysis........................................................................................................................56
5.1 SHO Problems ................................................................................................................56
5.1.1 Over High SHO Rate due to Improper SHO Relative Threshold .............................56
5.1.2 Delayed Handover due to Over Great Intra-frequency Filter Coefficient..................57
5.1.3 Missing Neighbor Cell............................................................................................58
5.1.4 Redundant Neighbor Cells.....................................................................................62
5.1.5 Pilot Pollution.........................................................................................................65
5.1.6 Turning Corner Effect ............................................................................................71
5.1.7 Needlepoint Effect .................................................................................................74
5.1.8 Quick Change of Best server Signal.......................................................................75
5.2 HHO Problems ................................................................................................................77
5.2.1 Intra-frequency Ping-pong HHO due to Improperly Configured 1D Event Hysteresis77
5.2.2 Delayed Origination of Inter-frequency Measurement due to Improper Inter-frequency
Measurement Quantity ..................................................................................................78
5.3 Inter-RAT Handover Problems.........................................................................................80
5.3.1 Ping-pong Reselection...........................................................................................80
5.3.2 PS Inter-RAT Ping-pong Handoff ...........................................................................81
5.3.3 Failure in handoff from 3G to the 2G network .........................................................82
5.3.4 Inter-RAT Handover Call Drop ...............................................................................84
5.4 Call Drop Problems .........................................................................................................91
5.4.1 OverWeak Coverage ............................................................................................91
5.4.2 Uplink Interference ................................................................................................92
5.4.3 Abnormal Equipment .............................................................................................95
5.5 HSDPA-related Problems ................................................................................................97
5.5.1 HSDPA Handover Problems..................................................................................97
5.5.2 HSDPA Call Drop ..................................................................................................98
5.6 HSUPA Problems..........................................................................................................100
6 Summary...............................................................................................................................101
7 Appendix...............................................................................................................................102
7.1 SRB&TRB Reset ...........................................................................................................102
7.1.1 RAB ....................................................................................................................102
7.1.2 SRB ....................................................................................................................103
7.2 RL FAILURE .................................................................................................................104
7.3 SHO Flow......................................................................................................................109
7.3.1 Analyzing Signaling Flow for Adding Radio Link...................................................109
7.3.2 Analyzing Signaling Flow for Deleting Radio Link.................................................112
7.3.3 Analyzing Signaling Flow for Adding and Deleting Radio Link ..............................113
7.3.4 SHO Algorithm ....................................................................................................116
7.4 Ordinary HHO Flow.......................................................................................................123
7.4.1 Ordinary HHO (lur Interface and CELL_DCH State) .............................................123
7.4.2 Inter-CN HHO Flow..............................................................................................125
7.5 HHO Algorithm..............................................................................................................128
7.5.1 Intra-frequency HHO Algorithm............................................................................128
7.5.2 Inter-frequency HHO Algorithm............................................................................128
7.6 Concept and Classification of HSDPA Handover............................................................130
7.6.1 Concept of HSDPA Handover..............................................................................130
7.6.2 Classification of HSDPA Handover ......................................................................130
7.6.3 Signaling Flow and Message Analysis of HSDPA Handover.................................131
7.6.4 HS-PDSCH Serving Cell Update due to DPCH SHO............................................132
7.6.5 HS-PDSCH Serving Cell Update due to DPCH HHO............................................139
7.6.6 DPCH Intra-frequency HHO with HS-DSCH Serving Cell Update.........................140
7.6.7 DPCH Inter-frequency HHO with HS-DSCH Serving Cell Update.........................141
7.6.8 Handover Between HSDPA and R99 ...................................................................143
7.6.9 Handover between HSDPA and GPRS................................................................152
7.6.10 Direct Retry of HSDPA.......................................................................................152
7.6.11 Switch of Channel Type .....................................................................................154
7.7 Concept and Classification of HSUPA Handover............................................................157
7.7.1 Basic Concepts....................................................................................................157
7.7.2 Classification of HSUPA Handover ......................................................................157
7.7.3 Signaling Flow and Message Analysis of HSUPA Handover.................................158
7.7.4 SHO from a HSUPA Cell to a Non-HSUPA Cell ...................................................164
7.7.5 SHO from a Non-HSUPA Cell to a HSUPA Cell ...................................................169
7.7.6 Handover Between a HSUPA Cell and a GSM/GPRS Cell ...................................172
7.7.7 Direct Retry of HSUPA.........................................................................................172
7.7.8 Switch between Channel Types...........................................................................174
7.8 Handover from WCDMA to GSM...................................................................................175
7.9 Handover from GSM toWCDMA ...................................................................................179
7.10 Handover from WCDMA to GPRS................................................................................182
7.11 Handover from GRPS toWCDMA................................................................................186
7.12 Parameters of Handover from 3G to 2G Network .........................................................189
7.13 Data Configuration for Supporting Bi-directional Roaming and Handover Between WCDMA and
GSM/GPRS........................................................................................................................192

Optimization Guide.rar


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[ash_or]

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[honhungoc]

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[siankirene]

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[coursekec]

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[Blacktiger]

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[takeiteasy612]

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