Introduction to Wireless Local Loop

William E. Webb, William Webb0890067023, 9780890067024

Here’s a comprehensive, easy-to-understand guide to the underlying technologies, key selection criteria, and design and deployment processes behind wireless local loop (WLL) systems. The book helps technical professionals develop a sound understanding of WLL system design procedures, and provides practical guidance on choosing the best WLL and access technologies. It’s unique in its clear presentation of both the technical and business issues associated with wireless in the local loop.If you’re a WLL engineer, or a non-technical manager, marketer, or regulator involved in WLL system development, you’ll find the information in this book invaluable. Well written introductory chapters discuss the main areas of the telecommunications environment, and the concepts of convergence and access technologies. You learn why wireless in the local loop is seriously challenging the use of traditional copper cable, the economic issues behind wired and wireless interconnection, and even some expert WLL market forecasts. Other advanced, practical sections…• Identify and describe key WLL parameters, including range and capacity• Evaluate various access technologies, and guide you in the selection process• Examine the CDMA/TDMA debate, and consider which represents a better access technique• Detail the network deployment process, with the help of an actual case study• Show you how to effectively target your telecom service in a wide range of environments• Describe how to apply for a license, choose a service offering, and develop the business case• Discuss critical customer service issues

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Table of contents :
Contents……Page 5
Preface……Page 13
Acknowledgments xiv……Page 14
I Setting the Scene……Page 16
1 What is Wireless Local Loop?……Page 17
1.1 Why a book on wireless local loop? 5……Page 19
1.2 Acronyms and terminology 6……Page 20
1.3 How to read this book 7……Page 21
2 The Converging World of Telephony, TV, and Computers……Page 23
2.1 Telecommunications 11……Page 25
2.2 Broadcasting 13……Page 27
2.3 Computing 15……Page 29
2.4 The new competing environment 16……Page 30
3 Access Technologies……Page 33
3.1 Access via twisted pair 20……Page 34
3.2 Access via coax 26……Page 40
3.3 Access via coax 29……Page 43
3.4 Access via mobile radio 30……Page 44
3.5 Access via WLL 31……Page 45
3.6 Summary of access technologies 32……Page 46
II Why Wireless?……Page 49
4 Telecommunications Environments Worldwide……Page 51
4.1 Developing countries……Page 53
4.2 Eastern Europe……Page 57
4.3 First world countries……Page 59
4.4 History of WLL……Page 67
4.5 The business of subsidization……Page 71
5 The Economics of Wireless Versus Fixed……Page 73
5.1 The cost of wired systems 61……Page 75
5.2 The cost of wireless systems 63……Page 77
5.4 Market forecasts 67……Page 81
III Technical Information About Wireless……Page 83
6.1 The environment of mobile radio propagation 71……Page 85
6.2 The line-of-sight channel 76……Page 90
6.3 Time variation in channels 81……Page 95
6.4 Wideband channels 82……Page 96
6.5 Frequencies for WLL 83……Page 97
6.6 Predicting WLL coverage 86……Page 100
7.1 Speech coding 89……Page 102
7.2 Ciphering 94……Page 107
7.3 Error-correction coding and interleaving 96……Page 109
7.4 Modulation 100……Page 113
7.5 Multiple access 102……Page 115
7.6 The use of spreading codes in a CDMA system 111……Page 124
7.7 Packet and circuit switching 117……Page 130
8 TDMA or CDMA?……Page 132
8.1 Capacity comparison 120……Page 133
8.2 Comparison of other factors 124……Page 137
8.3 Summary 129……Page 142
IV Wireless Radio Technologies……Page 144
9.1 Why so many choices? 133……Page 146
9.2 Standardization activities 135……Page 148
9.3 Segmenting the technologies 138……Page 151
9.4 Matching the technology to the requirement 139……Page 152
9.5 The important information 140……Page 153
10 The Cordless Technologies……Page 155
10.1 DECT 145……Page 157
10.2 PHS 150……Page 162
10.3 CT-2 151……Page 163
10.4 Summary of cordless systems 152……Page 164
11 The Cellular Technologies……Page 168
11.1 Analog cellular 158……Page 169
11.2 Digital cellular 160……Page 171
11.3 Future cellular systems 164……Page 175
11.4 Summary of cellular systems 167……Page 178
12 The Proprietary Technologies……Page 181
12.1 The TDMA technologies 172……Page 182
12.2 The CDMA technologies 174……Page 184
12.3 Other technologies 178……Page 188
12.4 Summary of proprietary technologies 182……Page 192
13.1 Capacity comparison 185……Page 195
13.2 Cost comparison 186……Page 196
13.4 Summary 188……Page 198
V Deploying Wireless Local Loop Systems……Page 202
14.1 The opportunities 195……Page 203
14.2 The license application 200……Page 208
14.3 Radio spectrum issues 202……Page 210
15 Choosing a Service Offering……Page 228
15.1 Possible components of the service offering 222……Page 229
15.2 Mobility in the local loop 227……Page 234
16.1 The overall structure of the business case……Page 240
16.2 The network build costs……Page 242
16.3 The on-going costs……Page 248
16.4 Predicting revenue……Page 250
16.5 Financing arrangements……Page 252
16.6 Summary financial statistics……Page 254
16.7 Tariffing policies……Page 257
17 Rolling Out the Network……Page 259
17.1 Selecting the number of cells 255……Page 261
17.2 Selecting the cell sites 258……Page 264
17.3 Connecting the cells to the switch 263……Page 269
17.4 Installing the subscriber units 272……Page 278
17.6 Summary 273……Page 279
18.1 Market demand forecast 275……Page 281
18.2 System grade of service 280……Page 286
18.4 Radio Spectrum Requirements 281……Page 287
18.5 Numbering requirements 285……Page 291
18.7 Network configuration 286……Page 292
18.8 Traffic matrix and routing 290……Page 296
18.9 Summary 291……Page 297
19 The Future……Page 299
19.1 Technical advances in WLL 294……Page 300
19.2 Technical advances in other access techniques 295……Page 301
19.3 Changing user demand 297……Page 303
19.4 The future for WLL 299……Page 305
List of Acronyms……Page 307
About the Author……Page 311
Index……Page 312