【資料名稱】：Radio Network Performance Monitoring and Optimization

【資料作者】：不詳

【資料日期】：2003

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

1 Introduction .......................................................................6
1.1 Overview ...............................................................................................6
1.2 Prerequisites .........................................................................................6
1.3 Denotations ...........................................................................................6
1.4 Abbreviations ........................................................................................7
2 The optimization process .................................................8
Performance data handling...................................................9
3 Tools...................................................................................9
3.1 Overview ...............................................................................................9
3.2 Test terminal .........................................................................................9
3.3 Pilot scanner .......................................................................................10
3.4 Spectrum analyzer ..............................................................................10
3.5 WCDMA performance analyzer ..........................................................11
3.6 WCDMA NeXplorer .............................................................................11
4 Input data .........................................................................11
4.1 Overview .............................................................................................11
4.2 Performance statistics.........................................................................12
4.3 Performance recording .......................................................................12
4.4 Fault logs from RNC and RBS............................................................12
4.5 Parameter data ...................................................................................13
5 Considerations ................................................................13
5.1 Timing..................................................................................................13
5.2 Physical channel characteristics .........................................................16
5.3 Defining cluster ...................................................................................17
5.4 Packet data .........................................................................................17
5.5 Drive test .............................................................................................19
6 Useful indicators .............................................................20
6.1 WCDMA radio characteristics .............................................................21
6.2 WCDMA functions...............................................................................31
WCDMA optimization issues...............................................37
7 Basic understanding .......................................................37
7.1 Radio environment..............................................................................37
7.2 Traffic profile .......................................................................................38
7.3 WCDMA radio characteristics .............................................................38
7.4 Review of the radio network plan........................................................44
8 Optimization issues.........................................................44
8.1 Pilot channel failure - high downlink interference ...............................44
8.2 Pilot channel failure - out of pilot coverage.........................................51
8.3 Pilot channel failure - inter-RAT mobility problem...............................54
8.4 Pilot pollution.......................................................................................55
RADIO NETWORK PERFORMANCE MONITORING AND OPTIMIZATION GUIDELINE
4(174) LIMITED INTERNAL INFORMATION 24/1551-HSD 101 02/1 Rev B 2003-01-17
8.5 Uplink and pilot coverage imbalance ..................................................57
8.6 Transmitting max DL code power – full coverage...............................60
8.7 Transmitting max DL code power – not full coverage.........................61
8.8 Downlink CCHs and pilot coverage imbalance...................................64
8.9 Insufficient received UL DPCH power.................................................65
8.10 Rapidly changing radio environment...................................................66
8.11 Swapped feeders ................................................................................68
8.12 Uneven load distribution......................................................................70
8.13 High downlink Tx power......................................................................74
8.14 High uplink RSSI.................................................................................77
8.15 Out of TXB resource ...........................................................................83
8.16 Out of RAXB resource.........................................................................84
8.17 Many downlink congestion events ......................................................86
8.18 Many uplink congestion events...........................................................88
8.19 High blocking rate due to admission control .......................................90
8.20 Service differentiation – high blocking rate to non-guaranteed user ..96
8.21 Many down-switches due to admission control ..................................99
8.22 Many down-switches due to coverage triggering................................99
8.23 Many down-switches in soft or softer handover............................... 100
8.24 Many down-switches due to congestion control .............................. 100
8.25 Many terminations due to congestion control .................................. 100
8.26 High FACH usage ............................................................................ 101
8.27 High switching rates between dedicated and common channels.... 103
8.28 Low data throughput ........................................................................ 104
8.29 Abnormal disconnection in soft or softer handover.......................... 105
8.30 Handover event detection failure ..................................................... 107
8.31 Handover function failure ................................................................. 111
8.32 High active set update rate .............................................................. 115
8.33 No suitable cell................................................................................. 116
8.34 Cell re-selection failure - UE in idle or cell_FACH mode ................. 121
8.35 Cell update procedure failure........................................................... 124
8.36 Random access procedure problem................................................ 126
8.37 Many intra-frequency cell re-selections ........................................... 131
8.38 Many inter-frequency cell re-selections ........................................... 132
8.39 Many outgoing inter-RAT cell re-selections ..................................... 134
8.40 Many cell update attempts ............................................................... 135
8.41 Many location area or routing area updates .................................... 135
8.42 Abnormal disconnection in inter-RAT handover or cell change....... 136
8.43 Compressed mode function failure .................................................. 137
8.44 Outgoing inter-RAT mobility event detection failure ........................ 139
8.45 Outgoing inter-RAT handover function failure ................................. 142
8.46 Outgoing inter-RAT cell change function failure .............................. 144
8.47 Many outgoing inter-RAT mobility - high downlink interference ...... 145
8.48 Many outgoing inter-RAT mobility – out of pilot coverage ............... 146
8.49 Many outgoing inter-RAT mobility – wrong parameter settings....... 147
8.50 Many compressed mode users........................................................ 147
ERICSSON WCDMA RADIO ACCESS NETWORK
24/1551-HSD 101 02/1 Rev B 2003-01-17 LIMITED INTERNAL INFORMATION 5(174)
8.51 RRC connection establishment failure............................................. 149
8.52 Dedicated radio link setup failure..................................................... 153
8.53 Uplink dedicated radio link synchronization failure – call setup....... 154
8.54 Downlink dedicated radio link synchronization failure – call setup.. 156
8.55 Signaling connection establishment failure...................................... 158
8.56 Radio access bearer establishment failure...................................... 158
8.57 Radio bearer establishment failure – SRB - DCH to RAB - DCH .... 159
8.58 Radio bearer establishment failure – SRB - DCH to RAB - RA/FA . 160
8.59 Radio bearer establishment failure – RAB - RA/FA to RAB – DCH 161
8.60 Poor quality in uplink ........................................................................ 163
8.61 Poor quality in downlink ................................................................... 164
9 References .....................................................................165
Appendix A - Interference from other cells......................166
Downlink................................................................................................... 166
Uplink........................................................................................................ 167
Appendix B – Modification of the pilot power .................170
Uplink non-optimized................................................................................ 170
Margin for pilot power modification .......................................................... 171
Example.................................................................................................... 173
Planning issues ........................................................................................ 173
Appendix C – Some drop cases in drive test...................174