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Informationen zum Autor Miikka Poikselkä , Program Manager, NSN, Finland. Harri Holma , Principal Engineer, NSN (NSN Fellow), Finland. Jukka Hongisto , Solution Architect, NSN, Finland. Juha Kallio , Architect, NSN, Finland. Antti Toskala , Head of 3GPP Radio Standardization, Finland. The authors are all with Nokia Siemens Networks (NSN) in Finland working on the cutting edge technologies for mobile communications today. They are involved with 3GPP Standardisation, and technical aspects, ensuring they are a in key position to write on this important topic. Klappentext Describes the technological solutions and standards which will enable the migration of voice and SMS services over to LTE/EPC networksMain drivers for the introduction of Long Term Evolution of UTRAN (LTE) is to provide far better end user experience for mobile broadband services. However, service providers also need to have a clear strategy of how to offer voice and messaging services for consumers and enterprises. The voice service over LTE is becoming increasingly important when the smartphone penetration is increasing rapidly. Smartphones require both good quality voice and high speed broadband data.This book provides the exhaustive view to industry-approved technologies and standards behind the Voice over LTE (VoLTE). Whether a decision maker or technology analyst, this book explains a topic of substantial global market interest. It provides a good introduction to the technology and is useful for operators who may be deploying VoLTE, product managers responsible for VoLTE products and those who work in implementation and standardization of related technologies.* Provides a comprehensive overview of industry-approved technologies and standards, providing vital information for decision makers and those working on the technology* Written by authors working at the cutting edge of mobile communications technology today, bringing a mix of standards and product background, guaranteeing in-depth practical and standards information* Covering the technical and practical elements of VoLTE, explaining the various approaches for providing voice services over LTE Zusammenfassung Describes the technological solutions and standards which will enable the migration of voice and SMS services over to LTE/EPC networks Main drivers for the introduction of Long Term Evolution of UTRAN (LTE) is to provide far better end user experience for mobile broadband services. Inhaltsverzeichnis Preface ix Acknowledgements xi List of Abbreviations xiii 1 Background 1 2 VoLTE Deployment Strategies 5 2.1 Common Networks Everywhere 5 2.2 GSM/WCDMA View 6 2.3 CDMA View 6 3 VoLTE System Architecture 9 3.1 Overview 9 3.2 LTE Radio 10 3.2.1 LTE Radio Background 10 3.2.2 LTE Radio Architecture 11 3.3 Evolved Packet Core 14 3.3.1 What is the Evolved Packet Core? 14 3.3.2 EPC Entities and Functionalities 14 3.3.3 EPS Mobility Management 17 3.3.4 EPS Session Management and QoS 20 3.4 Control 22 3.4.1 What is an IP Multimedia Subsystem? 22 3.4.2 IMS Development History 23 3.4.3 IMS Fundamentals 26 3.4.4 IMS Entities 32 3.4.5 Home Subscriber Server 42 3.4.6 Policy and Charging Rule Function 43 3.5 Summary 44 4 VoLTE Functionality 47 4.1 Overview 47 4.2 Radio Functionalities 47 4.2.1 Bearers and Scheduling 47 4.2.2 Mobility 49 4.2.3 Circuit Switched Fallback Handover 51 4.2.4 Mobility from 2G/3G Back to LTE 54 4.2.5 Power Saving Features 55 4.2.6 Positioning Solutions 56 4.2.7 UE Radio Access Capabilities for VoLTE 57 4.3 EPC Functionalities 58 4.3.1 LTE subscriber identification 59 4.3.2 PDN Connec...
