WCDMA RAN handover

[koti123]

Good document on WCDMA RAN Handover

[telecom.santosh]

Contents
1 Introduction 1
1.1 Target Groups 1
1.2 Revision Information 1
2 Overview 3
2.1 Soft/Softer Handover 3
2.2 Inter-Frequency Handover 5
2.3 Inter-RAT Handover 5
2.4 Service Based Handover 5
2.5 Inter-RAT Cell Change 5
2.6 Core Network Hard Handover 5
2.7 HSDPA Mobility 6
2.8 HSDPA and EUL Mobility 6
2.9 Connection Quality Monitoring 6
2.10 Frequency Handling 7
3 Technical Overview and Concepts Used 9
3.1 Evaluation and Measurement Handing 11
3.2 Measurement Handling (Meas_Handl) 11
3.3 3GPP-defined UE Associated Cell sets for Measurement 12
3.4 Hysteresis and Time to Trigger Concept 13
3.5 Filtering, Offsetting, and Weighting before Reporting 14
3.6 Compressed Mode 15
3.7 UE Capability Handling 16
3.8 Adjacent Cell Configuration 16
3.9 HSDPA and EUL Mobility Concepts 17
4 Soft and Softer Handover 19
4.1 Algorithms for Cell Sets and Lists 19
4.1.1 Cell Sets, Subsets and Lists 19
4.1.2 Monitored Set Creation 21
4.2 Soft and Softer Handover Evaluation 27
4.2.1 Configuring the UE for Soft/Softer Handover (Events
1a,1b,1c and 1d) 28
4.2.2 Measurement report message format for Event 1a,1b,1c
and 1d 29
4.2.3 Event 1a 29
4.2.4 Event 1b 32
4.2.5 Event 1c 33
4.2.6 Event 1d 36
4.2.7 Buffering and Queuing 39
4.3 Soft and Softer Handover Execution 39
4.3.1 Soft/Softer Handover Scenarios 40
4.3.2 Radio Link Addition 42
4.3.3 Radio Link Removal 43
4.3.4 Radio link Replacement 44
4.3.5 Exception Handling 44
5 Connection Quality Monitoring 45
5.1 General 45
5.2 Decision on Handover Type 46
5.3 Event 2d/2f Quality Monitoring 47
5.4 UE Tx Power Monitoring (Event 6d/6b) 49
6 IRAT HO 51
6.1 General 51
6.2 Configuring the UE for Evaluation (3a Event) 51
6.3 Inter-RAT Handover Evaluation 53
6.3.1 General 53
6.3.2 Event 3a handling by RNC 53
6.4 Inter-RAT Handover Execution 55
6.4.1 Services 56
6.4.2 Interaction with Other Functions 56
6.4.3 Actions Taken by Inter-RAT Handover Function 56
6.4.4 Exception Handling 58
6.5 Inter-RAT Cell Change Execution 58
6.5.1 Services 59
6.5.2 Interactions with Other Functions 60
6.5.3 Scenarios 60
6.5.4 IRATCC from WCDMA RAN to GPRS, UE on Dedicated
Channel 61
6.5.5 IRATCC from WCDMA RAN to GPRS, UE on Common
Channel 63
6.5.6 IRATCC from GPRS to WCDMA RAN 63
7 Inter Frequency HO 65
7.1 General on Inter-Frequency Handover Evaluation and
Execution 65
7.2 Configuring the UE for Evaluation (Event 2b) 65
7.3 Inter-Frequency Handover Evaluation 66
7.3.1 General 66
7.3.2 Event 2b handling by RNC 67
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7.4 Inter-Frequency Handover Execution 68
7.4.1 Services 69
7.4.2 Interactions with Other Functions 69
7.4.3 Scenarios 69
7.4.4 Actions taken by the Inter-Frequency Handover Function. 70
7.4.5 Exception Handling 72
8 HSDPA 73
8.1 Measurements for HSDPA Mobility Handling 73
8.2 HS-DSCH Mobility 75
8.2.1 Iur support 75
8.2.2 HS-DSCH Cell Change 76
8.2.3 Coverage Triggered Downswitch from HS-DSCH 78
8.2.4 No configured Iur support 78
8.2.5 HS-DSCH Cell Selection 79
8.2.6 HSDPA execution part 80
9 HSDPA and EUL Mobility 83
9.1 General 83
9.1.1 Iur support 83
9.1.2 E-DCH Soft/softer HO 84
9.1.3 E-DCH/HS-DSCH Cell Change 84
9.1.4 Leaving EUL coverage 86
9.1.5 Coverage Triggered Downswitch from E-DCH/HS-DSCH 87
9.1.6 E-DCH/HS-DSCH Cell Selection 87
10 Core Network Hard Handover 89
10.1 Measurement Handling for Core Network Hard Handover 89
10.2 Core Network Hard Handover Evaluation 90
10.2.1 Intra Frequency Core Network Hard Handover Evaluation 90
10.2.2 Inter Frequency Core Network Hard Handover Evaluation 91
10.3 Core Network Hard Handover Execution 92
10.3.1 Actions taken by Core Network Hard Handover 92
10.3.2 Exception Handling 94
11 Service-Based Handover 95
11.1 Description 95
11.2 Service Based Handover Execution 96
11.2.1 Interactions with Other Functions 96
11.2.2 Actions taken by Service Based Handover Execution 96
11.2.3 Exception Handling 97
12 Engineering Guidelines 99
12.1 Soft/Softer Handover 99
12.1.1 Cell Plan Importance for Handover Behavior 99
12.1.2 Determining Neighbor Cell Lists 100
12.1.3 Reducing Dropped Calls 101
12.1.4 Soft/Softer Handover Parameters 102
12.2 IRAT and IFHO Introduction 103
12.2.1 Connection Quality Monitoring 104
12.2.2 Enabling IRAT or IFHO Functions 104
12.2.3 General Tuning Procedure 104
12.3 IRAT Handover 105
12.3.1 GSM Neighbor Cell Lists 105
12.3.2 WCDMA to GSM HO Parameters 106
12.3.3 GSM to WCDMA Handover Parameters 108
12.3.4 WCDMA to GSM Cell Change for PS Interactive Services 109
12.3.5 GSM to WCDMA Cell Reselction for PS Interactive Services 109
12.4 IFHO 110
12.4.1 IFHO Neighbor Cell Lists 110
12.4.2 IFHO Parameters 111
12.5 Service-Based Handover 112
12.6 HSDPA Mobility Phase 1 and 2 113
12.6.1 Triggering Conditions 113
12.6.2 General Remarks 114
12.7 HSDPA and EUL Mobility 115
12.7.1 Serving Cell Change 115
12.7.2 Leaving EUL Coverage 115
13 Parameters 117
13.1 Descriptions 146
13.1.1 General 146
13.1.2 Intra Frequency Handover 146
13.1.3 Inter-Frequency and IRAT Handover 148
13.1.4 Inter-Frequency Handover only 150
13.1.5 Inter RAT Handover only 151
13.1.6 Core Network Hard Handover 152
13.1.7 HSDPA and EUL Mobility 153
13.2 Values and Ranges 154
14 Constants 161
15 Timers 163
16 Feature Control 165
16.1 IRAT HO 165
16.2 IF HO 165
16.3 HSDPA Mobility 165
16.4 EUL Mobility 165
16.5 Service Based HO 166
16.6 Core Network Hard Handover 166
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17 Glossary 167
Reference List 169
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