LTE Self-Organising Networks (SON): Network Management Automation for Operational Efficiency

422 Pages·6.396 MB·English

by  Hämäläinen S., Sanneck H., Sartori C. (Eds.)

LTE SELF-ORGANISING
NETWORKS (SON)
NETWORK MANAGEMENT
AUTOMATION FOR
OPERATIONAL EFFICIENCY
Edited By
Seppo Ha¨ma¨la¨inen, Henning Sanneck, Cinzia Sartori
Nokia Siemens Networks
Thiseditionfirstpublished2012
(cid:2)2012JohnWiley&Sons,Ltd
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LibraryofCongressCataloging-in-PublicationData
LTEself-organisingnetworks(SON):networkmanagementautomationforoperationalefficiency/editedby
SeppoH€am€al€ainen,HenningSanneck,CinziaSartori.
p.cm.
Includesbibliographicalreferencesandindex.
ISBN978-1-119-97067-5(cloth)
1. Self-organisingnetworks. I. Ha¨ma¨la¨inen,Seppo,1969– II. Sanneck,Henning,1968– III. Sartori,Cinzia,1960–
TK7872.D48L742012
6810.2–dc23 2011032030
AcataloguerecordforthisbookisavailablefromtheBritishLibrary.
PrintISBN:9781119970675
Setin10/12ptTimesbyThomsonDigital,Noida,India
PrintedandBoundinGreatBritainbyAntonyRoweLtd,Chippenham,Wiltshire.
To Leevi, Lina-Maria and Terja
In memory of Dr.-Ing. Hugo Sanneck (1932-2011)
To Nikos and Marika
Contents
Foreword xiii
Preface xv
List of Contributors xix
Acknowledgements xxi
List of Abbreviations xxiii
1. Introduction 1
1.1 Self-Organising Networks (SON) 3
1.2 The Transition from ConventionalNetworkOperation toSON 6
1.2.1 Automationof the Network Rollout 9
1.2.2 Automationof Network Optimisation andTroubleshooting 10
1.2.3 SON Characteristics and Challenges 11
References 12
2. LTE Overview 13
2.1 Introduction toLTE andSAE 13
2.1.1 3GPP Structure, Timeline and LTE Specifications 14
2.1.2 LTE Requirements 16
2.1.3 System ArchitectureOverview 16
2.1.4 Evolved UTRAN 18
2.1.5 E-UTRAN Functional Elements 19
2.1.6 Evolved Packet Core 21
2.1.7 Voice over LTE(VoLTE) 24
2.1.8 LTE-Advanced 24
2.1.9 Network Management 30
2.2 LTE Radio Access Network Scenariosand Their Evolution 33
2.2.1 LTE RadioCoverage Scenario 33
2.2.2 LTE for Capacity Enhancement in Existing GERAN/UTRAN 34
2.2.3 Enhancing LTE Capacity, the Multi-Layer LTE 34
2.2.4 Data Offloading, LIPA-SIPTO 35
2.2.5 Multi-Radio Access Network Scenarios or non-GPP 36
References 37
3. Self-Organising Networks (SON) 39
3.1 Vision 39
3.2 NGMN Operator Use Cases and3GPP SON Use Cases 42
viii Contents
3.2.1 Operational Use Cases 42
3.2.2 NGMN SON Use Casesand Requirements 47
3.2.3 SON Use Cases in 3GPP 50
3.3 Foundations for SON 52
3.3.1 Control Engineering:Feedback Loops 53
3.3.2 Autonomic ComputingandAutonomic Management 55
3.3.3 SON ResearchProjects 57
3.4 Architecture 60
3.4.1 Use-Case Related Criteria 62
3.4.2 System-Level Criteria 64
3.5 BusinessValue 65
3.5.1 The Economicsof eNB Sites 65
3.5.2 General Mode ofOperation ofSON 68
3.5.3 Installation and Planning 71
3.5.4 Network Optimisation 72
3.5.5 Fault Management 73
3.5.6 Conclusions 74
3.6 SON Operational and Technical Challenges 75
3.6.1 Transitionof OperationalProcessestoSON 75
3.6.2 Technical (Engineering) Challenges 78
References 80
4. Self-Configuration (‘Plug-and-Play’) 81
4.1 Auto-Connectivity and -Commissioning 82
4.1.1 Preparation 85
4.1.2 Connectivity Setup, Site-Identification and
Auto-Commissioning 87
4.1.3 LTE-A Relay Auto-Connectivity 93
4.1.4 Conclusions 100
4.2 Dynamic Radio Configuration 100
4.2.1 GenerationofInitial Transmission Parameters 106
4.2.2 Physical Cell-IDAllocation 111
4.2.3 Automatic Neighbour Relationship Setup (ANR) 118
4.2.4 DRC Architecture 130
4.2.5 Conclusions 132
References 133
5. Self-Optimisation 135
5.1 Mobility RobustnessOptimisation 136
5.1.1 Goals ofMRO 136
5.1.2 Cell Changes and Interference Challenges 137
5.1.3 MRO RelevantParameters 140
5.1.4 Causes for MobilityProblems 144
5.1.5 MRO Solutions 146
5.1.6 MROTime Scales 151
5.1.7 MRO Performance 152
Contents ix
5.2 MobilityLoad Balancingand TrafficSteering 157
5.2.1 Introduction toTrafficSteering 157
5.2.2 SON Policies for Mobility Load Balancing 159
5.2.3 ATheoretical ViewofLoadBalancing 160
5.2.4 Standardised Features and Procedures toDirect UEs
tothe DesiredLayer 166
5.2.5 Exemplary Results ofMLB 182
5.2.6 UplinkLoadBalancing 189
5.2.7 Interactions Between TS/MLB and MRO 190
5.3 EnergySaving 193
5.3.1 Introduction 193
5.3.2 Requirements 195
5.3.3 Energy SavingManagement 195
5.3.4 eNB OverlaidScenario 196
5.3.5 Capacity-Limited Network 198
5.3.6 Equipment/Local ES 200
5.3.7 Example Scenarios andExpected Gains 201
5.3.8 Summary 204
5.4 Coverage andCapacity Optimisation 204
5.4.1 CCO with AdaptiveAntennas 205
5.4.2 Performance Analysis for Antenna Parameter Optimisation
Based CCO 208
5.4.3 CCO with TX Power 216
5.5 RACH Optimisation 217
5.5.1 General 217
5.5.2 PRACH Configuration 218
5.5.3 RACHConfiguration 219
5.5.4 RACH/PRACH ConfigurationExample 221
5.5.5 RA Performance 222
5.5.6 Self-Optimisation Framework 223
5.5.7 UE Reporting 223
5.5.8 Inter-eNB Communication 225
5.6 RRM and SON (Interference Coordination, P0 Optimisation) 226
5.6.1 Interference Coordination 226
5.6.2 P0 Optimisation 230
References 232
6. Self-Healing 235
6.1 Introduction 236
6.1.1 3GPP Use Cases 236
6.1.2 3GPP Self-Healing Process andits Management 237
6.1.3 Cell DegradationManagement 238
6.2 Cell Degradation Detection 242
6.3 Cell Degradation Diagnosis and Prediction 248
6.3.1 Rule Based Systems 250
6.3.2 Bayesian Networks 251
x Contents
6.3.3 Case Based Reasoning 253
6.3.4 NeuralNetworks 255
6.3.5 Active Measurements 256
6.3.6 Prediction 257
6.4 Cell Outage Compensation 259
6.4.1 Activation ofCell Outage Compensation 260
6.4.2 MeansofCellOutageCompensation 260
6.4.3 Interaction between Cell Outage Compensation
and Self-Configuration Functions 263
References 264
7. Supporting Function: Minimisation of Drive Tests (MDT) 267
7.1 Introduction 267
7.1.1 General 267
7.1.2 History and Background 269
7.2 Relationto SON 272
7.3 Requirements 273
7.4 Use Cases 275
7.4.1 Operator Scenarios 276
7.4.2 Coverage Optimisation 277
7.4.3 MobilityOptimisation 281
7.4.4 Capacity Optimisation 281
7.4.5 Parameterisation for Common Channels 282
7.4.6 QoS Verification 282
7.5 OverallArchitecture 283
7.6 Managing MDT 285
7.6.1 Subscriberand EquipmentTrace 285
7.6.2 MDT Configuration Parameters 285
7.6.3 Subscription Based MDT 287
7.6.4 Area Based MDT 292
7.6.5 Supporting Functionality inthe Management System 293
7.6.6 MDT Reporting 293
7.7 MDT RadioInterface Procedures 295
7.7.1 Immediate MDT 296
7.7.2 Logged MDT 298
7.7.3 RLF Reporting 303
7.7.4 Measurement Parameters 305
7.7.5 LocationInformation 308
7.8 Conclusion 309
References 310
8. SON for Core Networks 311
8.1 Introduction 311
8.2 SON for Packet Core Networks 311
8.2.1 PacketCore Element Auto-Configuration 311
8.2.2 Automatic Neighbour Relation 313
Contents xi
8.2.3 S1 Flex(MME Pooling) 314
8.2.4 Signalling Optimisation 315
8.2.5 LatencyOptimisation 317
8.2.6 Fast GatewayConvergencewith Bidirectional
ForwardDetection 318
8.2.7 DynamicIP PoolAllocation 318
8.2.8 Energy Saving 319
8.3 SON for Voice Core Networks 319
8.3.1 Voice Over IPQuality Monitoring
and Management 319
8.3.2 Resource OptimisationinVoice Core Network 320
References 321
9. SON Operation 322
9.1 SON FunctionInteractions 323
9.1.1 Spatial Characteristic 324
9.1.2 TemporalCharacteristic 324
9.1.3 CategoriesofSON Conflicts 326
9.1.4 Network ParametersRelated toSON Functions 329
9.1.5 Examples for Conflicts between SON Functions 330
9.2 Coordination of SON Functions 334
9.2.1 Basic Optionsfor SON Coordination 334
9.2.2 Goals ofSON Function Coordination 338
9.2.3 SON Coordination FunctionConcept 340
9.2.4 Coordination Schemes 346
9.2.5 Related Work 352
9.2.6 SON Function CoordinationExample 352
9.3 Conclusions 355
References 356
10. SON for Heterogeneous Networks (HetNet) 357
10.1 Introduction 357
10.2 Standardisationand Network Architecture 359
10.2.1 Network Architecture for HetNet 361
10.3 Self-Configuration 362
10.3.1 Auto-Connectivityand -Commissioning 363
10.3.2 AutomaticSite Identificationand Hardware-to-SiteMapping 364
10.3.3 AutomaticNeighbour Relations (ANR) 365
10.4 Self-Optimisation: Interference Management 365
10.4.1 Interference Characteristics inHetNet Scenarios 365
10.4.2 Basic Interference Management Techniques 366
10.4.3 Scenarios with Macro eNBs and Micro/PicoeNBs 369
10.4.4 Enhanced Time-DomainInterference
Management: eICIC 370
10.4.5 Outlookon FurtherInterference Management Innovations 374