WCDMA-Access Problem Optimization Guide

**honhungoc** · 2011-01-07, 12:59 PM

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**comm123** · 2011-01-08, 05:05 AM

its an important doc for monitring the KPI's in 3G many thx for this doc

**Hamid714** · 2011-01-11, 06:14 AM

Hi dear I am unable to download this document can any one please send me this document via email
Thanks alot.

"hamid714@gmail.com"

**zeezzoo** · 2011-04-03, 10:15 PM

many thanks for the share
but dears can you share it on 4shared so all the juniors can download it because it seems to be very useful .
BR,

**arege17** · 2011-04-05, 03:40 AM

Thanks for sharing..and bigger thanks for not attaching with the post and sharing on other website

**learnumts.1987** · 2011-05-22, 06:20 AM

Originally Posted by tareq1010

Dears,
the attached documents is vey good to truobleshoot the access problems in 3G.

Chapter 1 Introduction........................................................................................................... 10
Chapter 2 Evaluating Access Performance............................................................................. 11
2.1 Accessibility............................................................................................................... 11
2.2 System Availability..................................................................................................... 11
2.3 Access Delay............................................................................................................. 12
Chapter 3 Analyzing DT/CQT Data.......................................................................................... 13
3.1 Data Analysis Software............................................................................................... 13
3.2 Definition of Access Failure........................................................................................ 13
3.2.1 Definition of Call Failure by GENEX Assistant.................................................... 13
3.2.2 Definition of Actix Analyzer............................................................................... 15
3.2.3 Definition of TEMS........................................................................................... 15
3.3 Flow and Methods for Analyzing Access Failure Problems............................................ 15
3.3.1 Overall Flow for Analyzing Call Failure Problems................................................. 15
3.3.2 Analyzing Paging Problems............................................................................... 16
Figure 3-2 Signaling flow of originated UE in locating paging problems................................ 17
3.3.3 Analyzing RRC Connection Setup Problems....................................................... 19
3.3.4 Analyzing Authentication Problems.................................................................... 22
3.3.5 Analyzing Security Mode Problems.................................................................... 24
3.3.6 Analyzing PDP Activation Failure Problems........................................................ 25
3.3.7 Analyzing RAB or RB Setup Problems............................................................... 25
3.4 Processing Access Delay Problems............................................................................ 28
3.4.1 Configuration of Discontinuous Cyclic Period Duration Factor DRX..................... 28
3.4.2 Whether to Disable Authentication and Encryption Flow...................................... 28
3.4.3 Implementing Early or Late Assignment.............................................................. 29
3.4.4 Whether the RRC Connection Is Set up on FACH and DCH.................................. 29
Chapter 4 Analyzing Traffic Statistics Data............................................................................. 30
4.1 Tool for Analyzing Data............................................................................................... 30
4.2 General Methods for Analyzing Traffic Statistics Data................................................... 30
4.2.1 Flow for Analyzing RNC-level Traffic Statistics Data............................................ 30
4.2.2 Flow for Analyzing Cell-level Traffic Statistics Data............................................. 31
4.3 Accessibility Indexes.................................................................................................. 32
4.3.1 Paging Traffic Statistics Indexes........................................................................ 32
4.3.2 Low Success Rate of RRC Setup....................................................................... 36
4.3.3 Low Success Rate of CS RAB Setup................................................................. 39
4.3.4 Lower Success Rate of PS RAB Setup.............................................................. 42
4.3.5 Low Success Rate of RB Setup......................................................................... 46
4.4 System Availability Index............................................................................................ 48
4.4.1 High Admission Rejection Rate.......................................................................... 48
4.4.2 High Paging Congestion Rate............................................................................ 48
4.4.3 High Rate of Congested Cell............................................................................. 48
Chapter 5 Solving Access Problems...................................................................................... 49
5.1 Paging Problems........................................................................................................ 49
5.1.1 Improper Power Configuration of Paging-related Channels.................................. 49
5.1.2 Paging Failure due to UE Location Area Update................................................. 49
5.1.3 Paging Failure due Implicit Detach of UE........................................................... 51
5.2 Cell Selection and Reselection Problem....................................................................... 51
5.2.1 Repeating to Send the RRC Connection Request Message due to Cell Reselection 51
5.3 RRC Setup Problems.................................................................................................. 54
5.3.1 Improper Configuration of Parameters of Uplink Access Channel......................... 54
5.3.2 Improper Configuration of AICH Power............................................................... 57
5.3.3 Improper Configuration of FACH Power............................................................. 57
5.3.4 Multiple Times of RRC Connection Request (for Service) and No RAB Assignment Request 59
5.3.5 RRC Connection of HSDPA Subscribers Rejected due to Inadequate Code Resource 63
5.4 RAB and RB Setup Problems...................................................................................... 65
5.4.1 RAB Setup Failure due to Inadequate Resource.................................................. 65
5.4.2 Handover Failure before Completion of Signaling Flow....................................... 66
5.4.3 Admission Failure due to HSDPA Total Bit Rate Threshold Exceeded by HSDPA Bit Rate of Cell 68
5.5 Authentication Problems............................................................................................. 69
5.6 Security Mode Problems............................................................................................. 69
5.7 Abnormal Equipment Problems................................................................................... 71
5.7.1 Abnormal NodeB.............................................................................................. 71
5.7.2 Abnormal UE.................................................................................................... 72
Chapter 6 Summary............................................................................................................... 75
Chapter 7 Appendix 1: Paging Process.................................................................................. 76
7.1 Paging Origination...................................................................................................... 76
7.1.1 Paging by CN................................................................................................... 76
7.1.2 Paging by UTRAN............................................................................................. 76
7.2 Paging Flow............................................................................................................... 76
7.2.1 Paging Type 1.................................................................................................. 76
7.2.2 Paging Type 2.................................................................................................. 77
7.3 Behaviors of UE after Receiving Paging...................................................................... 78
7.3.1 UE in Idle Mode................................................................................................ 78
7.3.2 UE in Connected Mode..................................................................................... 78
7.4 DRX Process of UE.................................................................................................... 79
7.4.1 DRX Cyclic Length and Paging Occasion........................................................... 79
7.4.2 Relationship of PICH and SCCPCH.................................................................... 80
7.4.3 PCH Selection.................................................................................................. 81
7.4.4 DRX Examples of UE....................................................................................... 82
Chapter 8 Appendix 2: Access Process Analysis.................................................................... 83
8.1 Cell Search................................................................................................................. 83
8.1.1 Timeslot Synchronization................................................................................... 83
8.1.2 Frame Synchronization and Scramble Group Identification.................................. 83
8.1.3 Identification of Cell Primary Scramble............................................................... 84
8.2 Cell Selection and Reselection..................................................................................... 84
8.2.1 Cell Selection.................................................................................................... 84
8.2.2 Judgment Criterion (Criterion S)......................................................................... 85
8.2.3 Cell Reselection................................................................................................ 87
8.3 Random Access......................................................................................................... 92
8.3.1 Random Access Channel................................................................................... 92
8.3.2 Random Access Process.................................................................................. 94
Chapter 9 Appendix 3: Authentication Flow............................................................................ 98
Chapter 10 Appendix 4: Description of Access-related Parameters........................................ 100
10.1 Engineering Parameters........................................................................................... 100
10.2 Cell Parameters....................................................................................................... 100
10.2.1 Transmit Power of FACH................................................................................ 100
10.2.2 Transmit Power of PCH.................................................................................. 100
10.2.3 Transmit Power of PICH................................................................................. 100
10.2.4 Cell Reselection Parameter: Measurement Hysteresis 2 (Qhyst2s).................... 101
10.2.5 Cell Reselection Parameter: Reselection Hysteresis Time (Treselections).......... 101
10.2.6 Cell Reselection Parameter: Sintrasearch........................................................ 101
10.2.7 Cell Reselection Parameter: Qoffset2............................................................. 101
10.2.8 Transmit Power of AICH................................................................................. 101
10.2.9 PRACH-related Parameters............................................................................ 101

can you please email me this document to learnumts.1987@gmail.com since i am a junior member I am not able to download.

Thanks in advance.