Synchronizing 5G Mobile Networks

Dennis Hagarty is an experienced technical specialist in the fields of information technology and telecommunications. He has led presales, consulting, and engineering efforts for major utilities, corporations, and service providers in Australasia and Europe. Having worked in numerous technical areas, Dennis has concentrated on the mobile space for almost 30 years and has specialized in timing and synchronization for the last 12 years. In his current role, Dennis is the Cisco communications interface between engineering, field sales teams, and the global Cisco customer community for all matters related to 5G timing and synchronization. This mandate sees him talking with many large service providers, including most of the world's tier 1 mobile operators. Shahid Ajmeri is a senior product manager at Cisco with responsibility for leading its 5G transport and mobile edge architecture strategy. He has more than 20 years of experience in the service provider industry, focusing on various technologies ranging from 3G/4G to 5G mobile networks, mobile edge computing, telco data center, service provider security, time synchronization, and end-to-end network design. Shahid has been instrumental in driving network transformation projects and architecting next-generation networks for customers across the globe. He currently works across disciplines, bringing together engineering, standards development organizations, and customers to develop and translate product requirements from industry and standard-setting bodies to the market. Anshul Tanwar is a principal engineer at Cisco Systems, where he is known as a technologist with a combination of R&D expertise and business sensibility. During his tenure of more than 20 years at Cisco, Anshul has architected many routing and switching products used by large tier 1 mobile and Metro Ethernet service providers across the world. He has led the SyncE and PTP architecture definition and implementation for multiple access and pre-aggregation routers in Cisco. In his most recent role, Anshul was responsible for defining the deployment architecture of phase timing synchronization for one of the world's largest service provider LTE/LTE-A networks. He is also a co-inventor on three patents, including one covering synchronization.

Foreword xxi Introduction xxiii Part I Fundamentals of Synchronization and Timing Chapter 1 Introduction to Synchronization and Timing 1 Overview of Time Synchronization 1 What Is Synchronization and Why Is It Needed? 3 What Is Time? 10 How Can GPS Provide Timing and Synchronization? 13 Accuracy Versus Precision Versus Stability 15 Summary 16 References in This Chapter 16 Chapter 1 Acronyms Key 16 Further Reading 17 Chapter 2 Usage of Synchronization and Timing 19 Use of Synchronization in Telecommunications 20 Use of Time Synchronization in Finance, Business, and Enterprise 28 Industrial Uses of Time-Power Industry 33 Summary 34 References in This Chapter 34 Chapter 2 Acronyms Key 35 Chapter 3 Synchronization and Timing Concepts 39 Synchronous Networks Overview 40 Clocks 54 Sources of Frequency, Phase, and Time 66 Timing Distribution Network 82 Consumer of Time and Sync (the End Application) 88 Summary 89 References in This Chapter 89 Chapter 3 Acronyms Key 92 Further Reading 95 Part II SDOs, Clocks, and Timing Protocols Chapter 4 Standards Development Organizations 97 International Telecommunication Union 98 International Mobile Telecommunications 104 3rd Generation Partnership Project 106 Institute of Electrical and Electronics Engineers 109 European Telecommunications Standards Institute 116 Internet Engineering Task Force 118 Radio Access Network 120 MEF Forum 126 Society of Motion Picture and Television Engineers and Audio Engineering Society 127 Summary 128 References in This Chapter 129 Chapter 4 Acronyms Key 132 Further Reading 137 Chapter 5 Clocks, Time Error, and Noise 139 Clocks 139 Time Error 154 Holdover Performance 169 Transient Response 172 Measuring Time Error 173 References in This Chapter 175 Chapter 5 Acronyms Key 175 Further Reading 177 Chapter 6 Physical Frequency Synchronization 179 Evolution of Frequency Synchronization 180 BITS and SSU 181 Clocking Hierarchy 185 Synchronous Ethernet 187 Enhanced Synchronous Ethernet 189 Clock Traceability 189 Synchronization Network Chain 197 Clock Selection Process 199 Timing Loops 201 Standardization 207 Summary 207 References in This Chapter 208 Chapter 6 Acronyms Key 209 Further Reading 211 Chapter 7 Precision Time Protocol 213 History and Overview of PTP 214 PTP Versus NTP 215 IEEE 1588-2008 (PTPv2) 216 PTP Clocks 242 Profiles 250 PTP Security 273 IEEE 1588-2019 (PTPv2.1) 275 Summary 280 References in This Chapter 280 Chapter 7 Acronyms Key 283 Part III Standards, Recommendations, and Deployment Considerations Chapter 8 ITU-T Timing Recommendations 289 Overview of the ITU 290 ITU-T Study Group 15 and Question 13 291 Reading the Recommendations 299 ITU-T Physical and TDM Timing Recommendations 299 ITU-T Recommendations for Frequency in Packet Networks 310 ITU-T Packet-Based Timing Recommendations 316 Possible Future Changes in Recommendations 340 Summary 341 References in This Chapter 341 Chapter 8 Acronyms Key 342 Furthe