The Third Generation Partnership Project specifies a solution to handle the heterogeneity of future networks, including quality of service (QoS) and charging aspects. This solution utilizes a policy-based approach based on the policy and charging control (PCC) architecture, which is an integral component of the evolved packet system (EPS). The specifications for EPS are being finalized with the evolved packet core (EPC) central to this framework. The EPC is a simplified, flat, all IP-based architecture that supports mobility between heterogeneous access networks and incorporates an evolved QoS concept based on the PCC framework. A critical open issue within EPS is the provisioning of end-to-end QoS enabled paths. This article proposes enhancements to the EPC/PCC framework that extend the end-to-end inter-domain mechanisms to discover the signaling routes at the service control layer, and use this information to determine the paths traversed by the media at the resource control layer. Because the approach operates at these layers, it is compatible with existing transport networks and exploits already existing QoS control mechanisms. A real testbed implementation, comprising free and open source software, is used to evaluate the proposed mechanisms. The obtained results show that the framework has an acceptable effect on session setup delay and core traffic overhead in a range of scenario ranging from simple, to typical, to worst case
This paper describes the IP Multimedia Subsystem (IMS), a Service Delivery Platform architecture for providing multimedia applications in converging fixed and mobile IP networks, called Next Generation Networks (NGN). It introduces the IMS architecture, which represents a combination of the classic Intelligent Network concept of the telecom world and current Internet protocols, and highlights the main IMS components and control features for the provision of multimedia information and communication services. Furthermore, the paper is focusing on the IMS Quality of Service (QoS) aspects defined within 3GPP IMS and ETSI TISPAN NGN.
IMS als Dienstplattform fü r Next Generation Networks.Dieser Artikel beschreibt die IP-Multimedia-Subsystem(IMS)-Architektur als Dienstplattform fü r multimediale Informations-und Kommunikationsanwendungen in konvergierenden Netzen, auch Next Generation Networks (NGN) genannt. Nach einer Einfü hrung der IMS-Architektur, die auf einer Kombination der klassischen Intelligenten Netze-und aktuellen Internetprotokollen basiert, werden die IMS-Hauptkomponenten sowie die Kontrollflü sse zur Bereitstellung von Multimediadiensten beleuchtet. Weiterhin konzentriert sich der Artikel auf die in der 3GPP und ETSI TISPAN NGN standardisierten IMS-Dienstgü teaspekte.
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