IP Multimedia Subsystem

About: IP Multimedia Subsystem is a research topic. Over the lifetime, 4398 publications have been published within this topic receiving 43698 citations.

Converged wireline-wireless network evolution: Opportunities and challenges

Abstract: Wireline-wireless convergence has become an important trend in the telecommunications industry as service providers (SPs) look for ways to increase average revenue per user (ARPU) and continue to reduce their costs. Most SPs believe they can expand their customer base efficiently by offering integrated services that are convenient for end users and that allow them to increase their productivity. SPs with multiple networks also want to eliminate redundancy and further reduce their costs. The emergence of Internet Protocol (IP)-based services, new broadband access technologies, and access-agnostic core architectures made possible by the development of new protocols and based on the IP Multimedia Subsystem (IMS) have created new network and service convergence dynamics that will enable SPs to deliver a broad range of converged services and truly enrich end users' experiences. This paper discusses the convergence opportunities and the key technical challenges and solutions (e.g., intelligent network [IN]/SIP interworking, operations convergence and quality of service [QoS]) that will enable wireline-wireless convergence to become a reality. It also presents a converged network evolution case study for an incumbent SP with separate wireless and wireline networks.

IMS: Model and calculation method of telecommunication network's capacity

Abstract: Solving the problems of convergence networks of various technologies, ensuring their compatibility at the level of control, signaling and traffic flows is connected with bringing the networks in compliance with the requirements of the IMS (IP Multimedia Subsystem) architecture. In the process of network pairing, two main tasks must be solved. The first is the interconnection of networks of different technologies for signaling. The second task is to ensure the interaction of networks at the level of traffic flows. When solving the first task, all kinds of signaling are transferred to the use of the SIP protocol. And when solving the second task, all types of transport streams are transferred to the stack protocols of IP network. All pairing tasks are addressed at the element management level CSCF (Call Session Control Function), P-CSCF (Proxy Call Session Control Function), I-CSCF (Interrogating CSCF), S-CSCF (Serving-CSCF). When designing the IMS management layer, it is necessary to determine the amount of traffic that will be served by CSCF elements. And then calculate the necessary performance of the branches of the telecommunications network to handle the signal and transport load. The article analyzes the functioning of the IMS core in solving the problems of conjugation of transport and signal flows. A list of the main elements involved in the management process has been determined. A model is proposed that allows to calculate the volume of incoming traffic from heterogeneous networks and its value after conversion to a standard form in accordance with the requirements of the IMS architecture. The requirements for the telecommunications component of the IMS architecture are defined.

User-centric analysis of perceived QoS in 4G IP mobile/wireless networks

Abstract: This paper presents the emerging requirements users are imposing upon the evolving world of heterogeneous 4G mobile/wireless networks through their perception of final services The mapping proposed in this paper groups together these user requirements in three main and distinguishable categories: service provision, connectivity, and adaptability and reconfigurability, by describing system concepts for each category from user terminal to network and services/applications

Multi-Technology Service Composition for the Telecommunication Domain - Concepts and Experiences

Abstract: Telecommunication networks are service centric and therefore benefit from service composition techniques in accordance to Service Oriented Architecture (SOA) principles. Furthermore, services in the telecommunication domain are subject to specific requirements such as support for end-to-end communication sessions and mechanisms for service interaction across technological borders including telecom, enterprise and Internet services. The presented approach uses a technology-agnostic core composition function, which is comprised of high-level abstraction in the description of heterogeneous services, constraint-based dynamic service selection and step-by-step instantiation of abstract composite application models. In order to better support telecommunication services, these concepts were combined with support for sessions, integration with IP multimedia subsystem (IMS) and support for legacy telecommunication technologies such as Intelligent Networks (IN) [1]. The presented composition approach has become part of products and solutions. This paper reports our experiences regarding the applicability of the technology, efficiency of the composite service development and performance of services composed using this approach.

Towards a Real Time Charging Framework for Complex Applications in 3GPP IP Multimedia System (IMS) Environment

Abstract: Real time charging is crucial to telecom operators who base their return on investment on this type of billing that still seems both attractive and fair to customers. In the context of the shift of network technology to the all-IP paradigm under the IMS umbrella, and the consequent revolution in terms of services, the concept of real-time charging evolved as well to tackle the challenges of multimedia services and packet switching technologies. However, IMS adds the notion of service composition by the service session concept that adds further complexity to the charging task. In order to handle this complexity, the present contribution suggests a framework to model applications and real-time charging policies according to involved services and their characteristics. Also, it introduces the concept of multi-definition of the single service in IMS charging paradigm.