SATNAC 2009 Conference Papers
The Intelligent IP Edge
Authors: Lesang Dikgole (
Abstract: Research has highlighted a need for a comprehensive interactivity framework for Internet Protocol Television (IPTV) services. Standardized IPTV architectures do not adequately address this need. Current video access techniques deployed over the Internet such as download and content-caching techniques offer limited video interactivity functions. This paper presents an advanced interactivity framework for IPTV services. The proposed framework is designed over the IP Multimedia Subsystem (IMS) architecture. The IMS based interactivity platform demonstrates that the advanced interactivity framework can be implemented using standardized protocols such as SIP and RTSP over the IMS based IPTV system.
Abstract: The IP Multimedia Subsystem (IMS) has been standardized as a Service Delivery Platform (SDP) positioned in the control layer of the Next Generation Network (NGN) infrastructure. To meet the diverse demands from NGN customers, it is effective to integrate different technologies, such as telecommunication, mobile, and Internet to enrich offered services. To integrate these domains the Service Oriented Architecture (SOA) concept developed for enterprise networks, can be applied into the IMS architecture. In this paper we overview the service control methods in IMS, discuss the concept of using a Service Broker (SB) to control and orchestrate service executions, and address some main issues of the integration of the SB component in the IMS architecture.
Authors: Vitalis Ozianyi (
Abstract: Resource sharing in commercial mobile networks may present operators with options to cut costs and prevent network churn. In resource sharing, when the network experiences resource constraints, the operator would negotiate with other reachable networks to outsource the provision of network access to users. The revenues earned from user payments would be shared by the home operator and the serving operator. Operators participating in service outsourcing are faced with financial challenges with regard to network resource sharing. Moreover, an operator’s users are placed under service control of the visited operator, a situation that may impact customer experience. On the other hand, the visited operator allocates network resources to visiting users, thus there is a risk of service blockage for home users. In this paper we explore resource sharing in inter-domain frameworks, and investigate factors that influence revenue distribution amongst involved operators. We develop strategies for use by operators to maximize revenues from resource sharing. The work is done in the domain of IP Multimedia Subsystem communications.
Authors: Richard Spiers (
Abstract: Telecommunication operators have begun moving to an all IP-based Next Generation Network (NGN) to save costs as well as enabling the rapid development of new services. A NGN is defined as a packet-based network where the service functionality is independent of the underlying transport technologies. The IP Multimedia Subsystem (IMS) is considered to be an intrinsic part of a NGN, and it provides mechanisms such as user authentication, Quality of Service (QoS) and charging. Traditionally, these mechanisms had to be created for each new service that the network operator wished to offer. The ability to reuse these features greatly speeds up the development of new services. This, together with the open protocols being used for the control signalling, is predicted to create a vast increase in the number of services being offered by the network operator as specialised telephony knowledge is no longer needed to develop new services. This increase in the number of potential services on offer has exacerbated the traditional problem of service conflict detection and resolution. This paper describes the current state of research in this area, discussing the advantages and disadvantages of current systems, as well as proposing a novel design that aims to address this issue.
Authors: Mosiuoa Tsietsi (Rhodes University), Alfredo Terzoli (Rhodes University), George Wells (Rhodes University)
Abstract: The OpenIMSCore is a testbed environment that allows researchers to experiment with components of a Next Generation Network, providing open source implementations of the IP Multimedia Subsystem Call Session Control Functions, as well as a Home Subscriber Server. As a control platform for IP communications, IMS behaves as a docking station for multimedia services which can be developed using various programming languages. Open source implementations of certain multimedia servers do currently exist which are based on different programming platforms and have been used by developers to enhance their testbeds. However, there is a practical downside to a heterogeneous service deployment strategy that employs disparate communication services in an expanding testbed. In order to reduce time-to-market, a consistent service deployment environment is needed, which is comprehensive enough to deliver most of the services currently available, but in a unified manner. The Mobicents platform is a suitable candidate for this requirement, bundling a number of multimedia servers and possessing interfaces to several popular IP protocols, all within the context of a common JAIN SLEE standard-compliant infrastructure, allowing a more consistent service development and deployment experience for developers. This paper compares the various components of Mobicents with a few popular open source servers that have been used in conjunction with the OpenIMSCore, and shows the benefits of its use as a service deployment platform.