Radio network trouble shooting guideline
Contents
1 Introduction 5
1.1 Overview 5
1.2 Denotations 5
1.3 Abbreviations 6
2 Call setup problems 8
2.1 Overview 8
2.2 Random access procedure problems 9
2.3 RRC Connection Setup problems 13
2.4 Signaling Connection Establishment Failures 18
2.5 RAB and RB Establishment or Release problems 19
3 Congestion and Admission 22
3.1 Overview 22
3.2 Downlink congestion 23
3.3 Uplink congestion 26
3.4 High blocking rate due to admission control 27
3.5 Service differentiation high blocking rate to non-guaranteed user 34
3.6 High Congestion and Admission reject in an isolated cell 37
4 Handover or cell update problems 41
4.1 Theory 41
4.2 Overview 42
4.3 Dropped Calls in soft or softer handover 46
4.4 Missing Measurement reports 48
4.5 Handover function failure 51
4.6 High active set update rate 55
4.7 No suitable cell 56
4.8 Cell re-selection failure - UE in idle or cell_FACH mode 60
4.9 Cell update procedure failure 63
4.10 Many intra-frequency cell re-selections 64
4.11 Many inter-frequency cell re-selections 65
4.12 Many cell update attempts 67
5 Hardware problems 68
5.1 Overview 68
5.2 Swapped feeders 68
5.3 Out of TXB resource 71
5.4 Out of RAXB resource 73
6 IRAT Handover 74
6.1 Overview 74
6.2 Outgoing inter-RAT handover function failure 75
6.3 Many outgoing IRAT Handovers/Cell reselections 80
6.4 Compressed Mode problems 82
7 Location Area and Routing Area 87
7.1 Overview 87
7.2 Fault Cases 87
7.3 Solutions 87
8 Low Packet data throughput 88
8.1 Overview 88
8.2 Poor throughput due to capacity problems 88
8.3 Channel Switching tuning 89
9 Pilot channel problems 90
9.1 Definitions 90
9.2 Overview 92
9.3 Fault Cases 94
9.4 Solutions 98
10 Power Control-Rapidly changing radio environment 106
10.1 Overview 106
10.2 Fault Cases 107
10.3 Solutions 107
11 Power problems 108
11.1 Overview 108
11.2 Fault Cases 111
11.3 Solutions 118
12 References 122
Appendix A - Interference from other cells 123
Downlink 123
Uplink 125
Appendix B Modification of the pilot power 127
Uplink non-optimized 127
Margin for pilot power modification 128
Example 130
Planning issues 130
Appendix C Some drop cases in drive test 131
Appendix D UL and DL DCH optimization, theory 132

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