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| Preface | |
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| Acknowledgements | |
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| List of Abbreviations | |
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| Background | |
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| VoLTE Deployment Strategies | |
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| Common Networks Everywhere | |
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| GSM/WCDMA View | |
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| CDMA View | |
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| VoLTE System Architecture | |
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| Overview | |
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| LTE Radio | |
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| LTE Radio Background | |
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| LTE Radio Architecture | |
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| Evolved Packet Core | |
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| What is the Evolved Packet Core? | |
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| EPC Entities and Functionalities | |
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| EPS Mobility Management | |
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| EPS Session Management and QoS | |
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| Control | |
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| What is an IP Multimedia Subsystem? | |
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| IMS Development History | |
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| IMS Fundamentals | |
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| IMS Entities | |
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| Home Subscriber Server | |
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| Policy and Charging Rule Function | |
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| Summary | |
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| VoLTE Functionality | |
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| Overview | |
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| Radio Functionalities | |
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| Bearers and Scheduling | |
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| Mobility | |
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| Circuit Switched Fallback Handover | |
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| Mobility from 2G/3G Back to LTE | |
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| Power Saving Features | |
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| Positioning Solutions | |
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| UE Radio Access Capabilities for VoLTE | |
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| EPC Functionalities | |
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| LTE subscriber identification | |
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| PDN Connectivity Establishment for the VoLTE User | |
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| EPS Dedicated Bearer Setup | |
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| IMS Identification | |
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| IP Multimedia Services Identity Module | |
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| Public User Identity | |
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| Private User Identity | |
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| Relationship between Private and Public User Identities | |
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| Identification of User's Device | |
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| Identification of Network Entities | |
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| Identification of Services (Public Service Identities) | |
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| Identification Without ISIM | |
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| IMS Service Provisioning | |
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| Enforcement of Allowed Services | |
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| Service-Triggering Information | |
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| Selection of AS | |
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| AS Behaviour | |
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| Service Provisioning in Action | |
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| IMS Multimedia Telephony | |
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| Introduction | |
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| Multimedia Communication | |
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| Supplementary Services | |
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| VoLTE End to End and Signalling | |
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| Overview | |
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| VoLTE Subscription and Device Configuration | |
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| EPS Attach for CSFB/IMS VoIP and Default Bearer Activation | |
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| IMS Registration | |
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| Constructing the REGISTER Request | |
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| From the UE to the P-CSCF | |
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| From the P-CSCF to the I-CSCF | |
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| From the I-CSCF to the S-CSCF | |
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| S-CSCF Challenges the UE | |
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| UE's Response to the Challenge | |
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| Registration at the S-CSCF | |
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| The 200 (OK) Response | |
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| Third-Party Registration to Application Servers | |
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| Subscription to Registration Event Package | |
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| Re-Registration and Re-Authentication | |
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| De-Registration | |
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| Related Standards | |
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| IMS VoIP Session | |
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| Constructing the INVITE Request | |
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| Routing | |
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| Media Negotiation | |
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| Media Resource Reservation and Policy Control | |
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| Charging | |
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| Session Release | |
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| Related Standards | |
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| Voice Continuity | |
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| PS-PS Intersystem Handover | |
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| Single Radio Voice Call Continuity | |
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| Summary | |
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| IMS Emergency Session | |
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| PDN Connection Setup for Emergency Session | |
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| Emergency Registration | |
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| Emergency Session | |
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| CS Fallback for Evolved Packet System Call Case(s) | |
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| Architecture of CS Fallback for EPS | |
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| Description of SGs Interface | |
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| Idle Mode Signalling Reduction and Use of CS Fallback for EPS | |
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| Idle Mode versus Active Mode UE with CS Fallback for EPS | |
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| CS Fallback Attachment | |
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| Mobile Originating Call Using CSFB | |
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| Mobile Terminating Call Using CSFB | |
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| Call Unrelated CSFB Procedures | |
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| Mobile Terminating Roaming Retry and Forwarding | |
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| Summary | |
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| VoLTE Messaging | |
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| Native IMS Messaging | |
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| SMS Interworking | |
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| Multimedia Messaging Service | |
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| Unstructured Supplementary Services Data Simulation in IMS | |
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| Summary | |
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| IMS Centralized Services | |
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| VoLTE Radio Performance | |
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| Coverage | |
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| Capacity | |
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| Latency | |
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| Summary | |
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| HSPA Voice over IP | |
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| References | |
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| Index | |