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Computer Networks, the Internet and Next Generation Networks

A Protocol-based and Architecture-based Perspective


Thi-Thanh-Mai Hoang

Most computer network books are described based on a top-down or button-up layer-based perspective – allowing readers to learn about concepts and protocols in one layer as a part of a complex system. At each layer, the books illustrated the mechanisms and protocols provided at this layer to its upper layer. Unlike other computer network books, this book additionally provides protocol-based and architecture-based perspective to study the computer networks, the Internet and Next Generation Networks. The book starts with a short introduction to the computer network and their design – covering the basic reference models, the multimedia networking, Next Generation Networking and Mobile Networking as well as network planning considerations. Fundamental techniques are described – covering mechanisms, protocols, architectures and services to control the traffic and ensure the QoS for data and multimedia applications. For each technique, the author formulates the problem statement and illustrates complete solution – including basic idea, concept, architecture, protocol behaviour, their advantages and disadvantages.


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5. Next Generation Networks and the IPMultimedia Subsystem


5. Next Generation Networks and the IP Multimedia Subsystem 5.1 Introduction A Next Generation Network (NGN) is a packet-based network that enables on the one hand the deployment of access independent services over converged fixed and mobile networks, and on the other hand the use of multiple broadband and QoS-enabled transport technologies in which service-related functions are independent from underlying transport-related technologies [TR-180.000]. NGN is one of four current solutions (GAN – cellular integration; 3GPP – WLAN internetworking; Femtocells; NGNs) for the Fixed Mobile Convergence (FMC), which is the convergence technology offering a way to connect a mobile phone to a fixed line infrastructure so that operators can provide services to their users irrespective of their location, access technology and end terminal. Next Generation Networks are based on Internet technologies including Internet Protocol (IP) and Multiprotocol Label Switching (MPLS) as the transport technology, and Session Initiation Protocol (SIP) at the application layer. Based on these technologies, NGNs allow the transport of various types of traffic (voice, video, data and signalling). Triple play services (Voice, Internet and TV) are available via Cable and xDSL already. The NGN brings mobility in to the picture and the opportunity for further bundling of high revenue services for customers. At the core of a NGN is the IP Multimedia Subsystem (IMS), which is defined by 3GPP and 3GPP2 standards and organisations and is based on Session Initiation Protocol 8SIP). IMS is a framework consisting of a set of specifications that describe the NGN architecture for implementing Voice...

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