Voice over LTE VoLTE

Describes the Voice over LTE (VoLTE) technological solutions and standards which will enable the migration of voice and SMS services over to LTE/SAE networks Covering radio, packet core and IMS, this book gives a holistic and system-wide view on how voice and SMS services will be provided in 4G mobile networks. Starting from the existing standards, it then gives readers an unbiased and end-to-end view of the standardized future voice technology. The various elements are described from a functional and logical perspective, before the authors explain how the system works from the perspective of call setup and mobility. It also takes an in-depth look at the most important technological issues, and allows readers to judge which of the different alternatives should be chosen for real network scenarios. Covering the technical and practical elements of Voice over LTE (VoLTE), this book explains the various approaches for providing voice services over LTE, a key network due for imminent roll out Focuses on the most important technological issues and allows readers to judge which of the different alternatives should be chosen for a real network Brings vital information for decision makers and those working on the technology and related products, as LTE has substantial cost-saving potential Authors bring a mixed of standards and product background, guaranteeing in-depth practical and standards information Whether a decision maker or technology analyst, this book explains a topic of substantial global market interest in the topic both now and in years to come. It gives a good technical introduction in the area of Voice over LTE and is useful for operators who think of deploying VoLTE, product managers responsible for VoLTE products and also those who work in implementation and standardization of related technologies.

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.

Preface	p. ix
Acknowledgements	p. xi
List of Abbreviations	p. xiii
Background	p. 1
VoLTE Deployment Strategies	p. 5
Common Networks Everywhere	p. 5
GSM/WCDMA View	p. 6
CDMA View	p. 6
VoLTE System Architecture	p. 9
Overview	p. 9
LTE Radio	p. 10
LTE Radio Background	p. 10
LTE Radio Architecture	p. 11
Evolved Packet Core	p. 14
What is the Evolved Packet Core?	p. 14
EPC Entities and Functionalities	p. 14
EPS Mobility Management	p. 17
EPS Session Management and QoS	p. 20
Control	p. 22
What is an IP Multimedia Subsystem?	p. 22
IMS Development History	p. 23
IMS Fundamentals	p. 26
IMS Entities	p. 32
Home Subscriber Server	p. 42
Policy and Charging Rule Function	p. 43
Summary	p. 44
VoLTE Functionality	p. 47
Overview	p. 47
Radio Functionalities	p. 47
Bearers and Scheduling	p. 47
Mobility	p. 49
Circuit Switched Fallback Handover	p. 51
Mobility from 2G/3G Back to LTE	p. 54
Power Saving Features	p. 55
Positioning Solutions	p. 56
UE Radio Access Capabilities for VoLTE	p. 57
EPC Functionalities	p. 58
LTE subscriber identification	p. 59
PDN Connectivity Establishment for the VoLTE User	p. 60
EPS Dedicated Bearer Setup	p. 65
IMS Identification	p. 65
IP Multimedia Services Identity Module	p. 66
Public User Identity	p. 67
Private User Identity	p. 67
Relationship between Private and Public User Identities	p. 67
Identification of User's Device	p. 68
Identification of Network Entities	p. 70
Identification of Services (Public Service Identities)	p. 70
Identification Without ISIM	p. 70
IMS Service Provisioning	p. 71
Enforcement of Allowed Services	p. 72
Service-Triggering Information	p. 73
Selection of AS	p. 75
AS Behaviour	p. 75
Service Provisioning in Action	p. 76
IMS Multimedia Telephony	p. 79
Introduction	p. 79
Multimedia Communication	p. 80
Supplementary Services	p. 81
VoLTE End to End and Signalling	p. 99
Overview	p. 99
VoLTE Subscription and Device Configuration	p. 100
EPS Attach for CSFB/IMS VoIP and Default Bearer Activation	p. 102
IMS Registration	p. 107
Constructing the REGISTER Request	p. 109
From the UE to the P-CSCF	p. HO
From the P-CSCF to the I-CSCF	p. 110
From the I-CSCF to the S-CSCF	p. 111
S-CSCF Challenges the UE	p. 111
UE's Response to the Challenge	p. 112
Registration at the S-CSCF	p. 113
The 200 (OK) Response	p. 113
Third-Party Registration to Application Servers	p. 114
Subscription to Registration Event Package	p. 115
Re-Registration and Re-Authentication	p. 115
De-Registration	p. 116
Related Standards	p. 117
IMS VoIP Session	p. 118
Constructing the INVITE Request	p. 120
Routing	p. 122
Media Negotiation	p. 127
Media Resource Reservation and Policy Control	p. 129
Charging	p. 135
Session Release	p. 141
Related Standards	p. 143
Voice Continuity	p. 144
PS-PS Intersystem Handover	p. 144
Single Radio Voice Call Continuity	p. 145
Summary	p. 157
IMS Emergency Session	p. 160
PDN Connection Setup for Emergency Session	p. 160
Emergency Registration	p. 161
Emergency Session	p. 163
CS Fallback for Evolved Packet System Call Case(s)	p. 164
Architecture of CS Fallback for EPS	p. 166
Description of SGs Interface	p. 168
Idle Mode Signalling Reduction and Use of CS Fallback for EPS	p. 169
Idle Mode versus Active Mode UE with CS Fallback for EPS	p. 111
CS Fallback Attachment	p. 173
Mobile Originating Call Using CSFB	p. 174
Mobile Terminating Call Using CSFB	p. 180
Call Unrelated CSFB Procedures	p. 187
Mobile Terminating Roaming Retry and Forwarding	p. 189
Summary	p. 193
VoLTE Messaging	p. 194
Native IMS Messaging	p. 194
SMS Interworking	p. 196
Multimedia Messaging Service	p. 214
Unstructured Supplementary Services Data Simulation in IMS	p. 214
Summary	p. 215
IMS Centralized Services	p. 217
VoLTE Radio Performance	p. 223
Coverage	p. 223
Capacity	p. 224
Latency	p. 226
Summary	p. 228
HSPA Voice over IP	p. 229
References	p. 233
Index	p. 237
Table of Contents provided by Ingram. All Rights Reserved.

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