WIRELESS NETWORKS

ljzhang

Contents
Preface xv
1 Introduction to Wireless Networks 1
1.1 Evolution of Wireless Networks 2
1.1.1 Early Mobile Telephony 2
1.1.2 Analog Cellular Telephony 3
1.1.3 Digital Cellular Telephony 4
1.1.4 Cordless Phones 7
1.1.5 Wireless Data Systems
1.1.6 Fixed Wireless Links 11
1.1.7 Satellite Communication Systems 11
1.1.8 Third Generation Cellular Systems and Beyond 12
1.2 Challenges 12
1.2.1 Wireless Medium Unreliability 13
1.2.2 Spectrum Use 13
1.2.3 Power Management 13
1.2.4 Security 14
1.2.5 Location/Routing 14
1.2.6 Interfacing with Wired Networks 14
1.2.7 Health Concerns 14
1.3 Overview 15
1.3.1 Chapter 2: Wireless Communications Principles and Fundamentals 15
1.3.2 Chapter 3: First Generation (1G) Cellular Systems 16
1.3.3 Chapter 4: Second Generation (2G) Cellular Systems 16
1.3.4 Chapter 5: Third Generation (3G) Cellular Systems 17
1.3.5 Chapter 6: Future Trends: Fourth Generation (4G) Systems and Beyond 18
1.3.6 Chapter 7: Satellite Networks 19
1.3.7 Chapter 8: Fixed Wireless Access Systems 19
1.3.8 Chapter 9: Wireless Local Area Networks 20
1.3.9 Chapter 10: Wireless ATM and Ad Hoc Routing 21
1.3.10 Chapter 11: Personal Area Networks (PANs) 21
1.3.11 Chapter 12: Security Issues in Wireless Systems 22
1.3.12 Chapter 13: Simulation of Wireless Network Systems 22
1.3.13 Chapter 14: Economics of Wireless Networks 23
WWW Resources 23
References 23
2 Wireless Communications Principles and Fundamentals 25
2.1 Introduction 25
2.1.1 Scope of the Chapter 26
2.2 The Electromagnetic Spectrum 26
2.2.1 Transmission Bands and their Characteristics 27
2.2.2 Spectrum Regulation 30
2.3 Wireless Propagation Characteristics and Modeling 32
2.3.1 The Physics of Propagation 32
2.3.2 Wireless Propagation Modeling 36
2.3.3 Bit Error Rate (BER) Modeling of Wireless Channels 41
2.4 Analog and Digital Data Transmission 41
2.4.1 Voice Coding 43
2.5 Modulation Techniques for Wireless Systems 46
2.5.1 Analog Modulation 47
2.5.2 Digital Modulation 49
2.6 Multiple Access for Wireless Systems 54
2.6.1 Frequency Division Multiple Access (FDMA) 55
2.6.2 Time Division Multiple Access (TDMA) 56
2.6.3 Code Division Multiple Access (CDMA) 58
2.6.4 ALOHA-Carrier Sense Multiple Access (CSMA) 59
2.6.5 Polling Protocols 61
2.7 Performance Increasing Techniques for Wireless Networks 67
2.7.1 Diversity Techniques 67
2.7.2 Coding 71
2.7.3 Equalization 74
2.7.4 Power Control 75
2.7.5 Multisubcarrier Modulation 76
2.8 The Cellular Concept 77
2.8.1 Mobility Issues: Location and Handoff 80
2.9 The Ad Hoc and Semi Ad Hoc Concepts 81
2.9.1 Network Topology Determination 82
2.9.2 Connectivity Maintenance 83
2.9.3 Packet Routing 84
2.9.4 The Semi Ad Hoc Concept 84
2.10 Wireless Services: Circuit and Data (Packet) Mode 85
2.10.1 Circuit Switching 85
2.10.2 Packet Switching 86
2.11 Data Delivery Approaches 87
2.11.1 Pull and Hybrid Systems 88
2.11.2 Push Systems 88
2.11.3 The Adaptive Push System 89
2.12 Overview of Basic Techniques and Interactions Between the Different Network Layers 90
2.13 Summary 92
WWW Resources 92
References 93
Further Reading 94
3 First Generation (1G) Cellular Systems 95
3.1 Introduction 95
3.1.1 Analog Cellular Systems 96
3.1.2 Scope of the Chapter 97
3.2 Advanced Mobile Phone System (AMPS) 97
3.2.1 AMPS Frequency Allocations 97
3.2.2 AMPS Channels 98
3.2.3 Network Operations 99
3.3 Nordic Mobile Telephony (NMT) 102
3.3.1 NMT Architecture 102
3.3.2 NMT Frequency Allocations 103
3.3.3 NMT Channels 103
3.3.4 Network Operations: Mobility Management 104
3.3.5 Network Operations 106
viii Contents
3.3.6 NMT Security 107
3.4 Summary 109
WWW Resources 109
References 109
4 Second Generation (2G) Cellular Systems 111
4.1 Introduction 111
4.1.1 Scope of the Chapter 113
4.2 D-AMPS 113
4.2.1 Speech Coding 114
4.2.2 Radio Transmission Characteristics 114
4.2.3 Channels 115
4.2.4 IS-136 116
4.3 cdmaOne (IS-95) 117
4.3.1 cdmaOne Protocol Architecture 117
4.3.2 Network Architecture-Radio Transmission 118
4.3.3 Channels 118
4.3.4 Network Operations 120
4.4 GSM 121
4.4.1 Network Architecture 122
4.4.2 Speech Coding 125
4.4.3 Radio Transmission Characteristics 125
4.4.4 Channels 129
4.4.5 Network Operations 129
4.4.6 GSM Authentication and Security 132
4.5 IS-41 133
4.5.1 Network Architecture 133
4.5.2 Inter-system Handoff 134
4.5.3 Automatic Roaming 135
4.6 Data Operations 136
4.6.1 CDPD 136
4.6.2 HCSD 138
4.6.3 GPRS 138
4.6.4 D-AMPS1 139
4.6.5 cdmaTwo (IS-95b) 140
4.6.6 TCP/IP on Wireless-Mobile IP 140
4.6.7 WAP 142
4.7 Cordless Telephony (CT) 143
4.7.1 Analog CT 143
4.7.2 Digital CT 144
4.7.3 Digital Enhanced Cordless Telecommunications Standard (DECT) 144
4.7.4 The Personal Handyphone System (PHS) 147
4.8 Summary 147
WWW Resources 148
References 148
5 Third Generation (3G) Cellular Systems 151
5.1 Introduction 151
5.1.1 3G Concerns 153
5.1.2 Scope of the Chapter 154
5.2 3G Spectrum Allocation 154
5.2.1 Spectrum Requirements 154
5.2.2 Enabling Technologies 157
5.3 Third Generation Service Classes and Applications 158
Contents ix
5.3.1 Third Generation Service Classes 159
5.3.2 Third Generation Applications 160
5.4 Third Generation Standards 161
5.4.1 Standardization Activities: IMT-2000 161
5.4.2 Radio Access Standards 162
5.4.3 Fixed Network Evolution 183
5.5 Summary 185
WWW Resources 186
References 186
Further Reading 188
6 Future Trends: Fourth Generation (4G) Systems and Beyond 189
6.1 Introduction 189
6.1.2 Scope of the Chapter 190
6.2 Design Goals for 4G and Beyond and Related Research Issues 190
6.2.1 Orthogonal Frequency Division Multiplexing (OFDM) 192
6.3 4G Services and Applications 195
6.4 Challenges: Predicting the Future of Wireless Systems 196
6.4.1 Scenarios: Visions of the Future 197
6.4.2 Trends for Next-generation Wireless Networks 197
6.4.3 Scenario 1: Anything Goes 198
6.4.4 Scenario 2: Big Brother 199
6.4.5 Scenario 3: Pocket Computing 200
6.5 Summary 200
WWW Resources 201
References 201
7 Satellite Networks 203
7.1 Introduction 203
7.1.1 Historical Overview 203
7.1.2 Satellite Communications Characteristics 204
7.1.3 Spectrum Issues 205
7.1.4 Applications of Satellite Communications 206
7.1.5 Scope of the Chapter 207
7.2 Satellite Systems 207
7.2.1 Low Earth Orbit (LEO) 208
7.2.2 Medium Earth Orbit (MEO) 209
7.2.3 Geosynchronous Earth Orbit (GEO) 210
7.2.4 Elliptical Orbits 212
7.3 VSAT Systems 213
7.4 Examples of Satellite-based Mobile Telephony Systems 215
7.4.1 Iridium 215
7.4.2 Globalstar 220
7.5 Satellite-based Internet Access 222
7.5.1 Architectures 222
7.5.2 Routing Issues 224
7.5.3 TCP Enhancements 225
7.6 Summary 226
WWW Resources 227
References 228
Further Reading 228
x Contents
8 Fixed Wireless Access Systems 229
8.1 Wireless Local Loop versus Wired Access 229
8.2 Wireless Local Loop 231
8.2.1 Multichannel Multipoint Distribution Service (MMDS) 231
8.2.2 Local Multipoint Distribution Service (LMDS) 232
8.3 Wireless Local Loop Subscriber Terminals (WLL) 234
8.4 Wireless Local Loop Interfaces to the PSTN 234
8.5 IEEE 802.16 Standards 235
8.6 Summary 237
References 238
9 Wireless Local Area Networks 239
9.1 Introduction 239
9.1.1 Benefits of Wireless LANs 240
9.1.2 Wireless LAN Applications 240
9.1.3 Wireless LAN Concerns 241
9.1.4 Scope of the Chapter 243
9.2 Wireless LAN Topologies 243
9.3 Wireless LAN Requirements 245
9.4 The Physical Layer 247
9.4.1 The Infrared Physical Layer 247
9.4.2 Microwave-based Physical Layer Alternatives 249
9.5 The Medium Access Control (MAC) Layer 256
9.5.1 The HIPERLAN 1 MAC Sublayer 257
9.5.2 The IEEE 802.11 MAC Sublayer 260
9.6 Latest Developments 267
9.6.1 802.11a 267
9.6.2 802.11b 267
9.6.3 802.11g 268
9.6.4 Other Ongoing Activities within Working Group 802.11 268
9.7 Summary 269
WWW Resources 271
References 271
Further Reading 272
10 Wireless ATM and Ad Hoc Routing 273
10.1 Introduction 273
10.1.1 ATM 273
10.1.2 Wireless ATM 275
10.1.3 Scope of the Chapter 276
10.2 Wireless ATM Architecture 276
10.2.1 The Radio Access Layer 277
10.2.2 Mobile ATM 278
10.3 HIPERLAN 2: An ATM Compatible WLAN 280
10.3.1 Network Architecture 280
10.3.2 The HIPERLAN 2 Protocol Stack 281
10.4 Routing in Wireless Ad Hoc Networks 287
10.4.1 Table-driven Routing Protocols 288
10.4.2 On-demand Routing Protocols 291
10.5 Summary 295
WWW Resources 296
References 296
Contents xi
11 Personal Area Networks (PANs) 299
11.1 Introduction to PAN Technology and Applications 299
11.1.1 Historical Overview 299
11.1.2 PAN Concerns 301
11.1.3 PAN Applications 302
11.1.4 Scope of the Chapter 303
11.2 Commercial Alternatives: Bluetooth 303
11.2.1 The Bluetooth Specification 303
11.2.2 The Bluetooth Radio Channel 306
11.2.3 Piconets and Scatternets 307
11.2.4 Inquiry, Paging and Link Establishment 309
11.2.5 Packet Format 310
11.2.6 Link Types 311
11.2.7 Power Management 313
11.2.8 Security 314
11.3 Commercial Alternatives: HomeRF 315
11.3.1 HomeRF Network Topology 316
11.3.2 The HomeRF Physical Layer 318
11.3.3 The HomeRF MAC Layer 318
11.4 Summary 323
WWW Resources 325
References 325
Further Reading 325
12 Security Issues in Wireless Systems 327
12.1 The Need for Wireless Network Security 327
12.2 Attacks on Wireless Networks 328
12.3 Security Services 330
12.4 Wired Equivalent Privacy (WEP) Protocol 331
12.5 Mobile IP 334
12.6 Weaknesses in the WEP Scheme 335
12.7 Virtual Private Network (VPN) 336
12.7.1 Point-to-Point Tunneling Protocol (PPTP) 337
12.7.2 Layer-2 Transport Protocol (L2TP) 337
12.7.3 Internet Protocol Security (IPSec) 338
12.8 Summary 338
References 339
13 Simulation of Wireless Network Systems 341
13.1 Basics of Discrete-Event Simulation 341
13.1.1 Subsystem Modeling 344
13.1.2 Variable and Parameter Estimation 344
13.1.3 Selection of a Programming Language/Package 344
13.1.4 Verification and Validation (V&V) 344
13.1.5 Applications and Experimentation 345
13.2 Simulation Models 346
13.3 Common Probability Distributions Used in Simulation 348
13.4 Random Number Generation 351
13.4.1 Linear-Congruential Generators (LCG) 351
13.4.2 Midsquare Method 352
13.4.3 Tausworthe Method 352
13.4.4 Extended Fibonacci Method 352
13.5 Testing Random Number Generators 353
13.6 Random Variate Generation 354
xii Contents
13.6.1 The Inverse Transformation Technique 355
13.6.2 Rejection Method 355
13.6.3 Composition Technique 356
13.6.4 Convolution Technique 356
13.6.5 Characterization Technique 357
13.7 Case Studies 357
13.7.1 Example 1: Performance Evaluation of IEEE 802.11 WLAN Configurations Using
Simulation 357
13.7.2 Example 2: Simulation Analysis of the QoS in IEEE 802.11 WLAN System 360
13.7.3 Example 3: Simulation Comparison of the TRAP and RAP Wireless LANs Protocols 366
13.7.4 Example 4: Simulation Modeling of Topology Broadcast Based on Reverse-Path
Forwarding (TBRPF) Protocol Using an 802.11 WLAN-based MONET Model 372
13.7 Summary 378
References 378
14 Economics of Wireless Networks 381
14.1 Introduction 381
14.1.1 Scope of the Chapter 382
14.2 Economic Benefits of Wireless Networks 382
14.3 The Changing Economics of the Wireless Industry 383
14.3.1 Terminal Manufacturers 383
14.3.2 Role of Governments 384
14.3.3 Infrastructure Manufacturers 385
14.3.4 Mobile Carriers 385
14.4 Wireless Data Forecast 387
14.4.1 Enabling Applications 387
14.4.2 Technological Alternatives and their Economics 388
14.5 Charging Issues 388
14.5.1 Mobility Charges 389
14.5.2 Roaming Charges 391
14.5.3 Billing: Contracts versus Prepaid Time 391
14.5.4 Charging 393
14.6 Summary 396
References 397
Further Reading 397
Index 399
part 1

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