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Wiley the IMS IP multimedia concepts and services in the mobile domain (2004) DDU
[...]... peer-to-peer IP connections of applications Figure 1.2 The IMS and its relationship with existing communication systems Figure 1.2 shows a consolidated network where the IMS introduces multimedia session control in the packet-switched domain and at the same time brings circuitswitched functionality in the packet-switched domain The IMS is a key technology for network consolidation Traditionally, the mobile. .. and layering architecture Structure of HSS Relationship between different AS types Signalling conversion in the SGW IMS architecture HSS resolution using the SLF A high-level IMS registrationflow A high-level IMS session establishment flow Relationship between user identities IP Multimedia Services Identity Module Security architecture of the IMS Security domains underlining the IMS NDS /IP and SEGs... Preface the book shows how different protocols are built up, how they work and why they are applied within the IMS Finally, the last part gives an introduction to some of the advanced services in IMS with call flows This part proves that the convergence of services and networks is not a myth, but a real added value for the user The Third Generation Partnership Project (3GPP) and the IETF have worked together... affecting the quality of voice xviii Foreword ment through their work in the standardization arena This book provides the essential insight into the architecture and structure of these new networks Petri Poyhonen Vice President Nokia Networks Preface The Internet Protocol (IP) Multimedia Subsystem, better known as "The IMS" , is based on the specification of the Session Initiation Protocol (SIP) as standardized... 5.8 Initial IMS registration flow Routing during registration Third-party registration by S-CSCF Authentication information flows during IMS registration SA establishment during initial registration Two sets of SAs during re-authentication Taking a new set of SAs into use and dropping an old set of SAs Request and response routing between the UE and the P-CSCF over UDP Request and response routing... packet-switched domain This book was written to provide detailed insights about what the IMS is, its concepts, architecture, protocols and services Its intended audience ranges from marketing managers, research and development engineers, test engineers to university students The book is written in a manner that allows readers to choose the level of knowledge they need and the depth in understanding they desire... critical IP connectivity capability is offered only in isolated and single-service provider environments in the Internet We need a global system the IMS It enables applications in mobile devices to establish peer-to-peer connections True integration of voice and data services increases productivity and overall effectiveness, while the development of innovative applications integrating voice, data and multimedia. .. create demands for new services, such as presence, multimedia chat, conferencing, push to talk and conferencing The skill to combine mobility and the IP network will be crucial to service success in the future The IMS Miikka Poikselka, Georg Mayer, Hisham Khartabil and Aki Niemi Copyright 2004 by John Wiley & Sons, Ltd ISBN 0-470-87113-X 4 The IMS Figure 1.1 The key ingredient to new, enriching user... about the IMS The book is also very well suited as a reference The first few chapters in Part I provide a detailed overview of the system architecture and the entities that, when combined, provide the IMS The chapters also present the reference points (interfaces) between those entitites and introduces the protocols assigned to those interfaces As with every communication system, the IMS is built on concepts. .. System for Mobile Communications (GSM) during the late 1980s and 1990s ETSI also defined the GPRS network architecture The last GSM-only standard was produced in 1998, and in the same year the 3GPP was founded by standardization bodies from Europe, Japan, South Korea, the USA and China to specify a third-generation mobile system comprising Wideband Code Division Multiple Access (WCDMA) and Time Division/Code . page intentionally left blank h IMS This page intentionally left blank THE IMS IP Multimedia Concepts and Services in the Mobile Domain Miikka Poikselka, Georg Mayer, Hisham Khartabil and. 62 3.6.3 Network domain security 62 3.6.4 IMS access security for SIP-based services 66 3.6.5 IMS access security for HTTP-based services 70 3.7 Discovering the IMS entry point 72 3.8 . Establishing an SA during initial registration 144 5.7.3 Handling of multiple sets of SAs in case of re-authentication 146 5.7.4 SA lifetime 149 5.7.5 Port setting and routing 150 5.7.6