Showing papers on "IP Multimedia Subsystem published in 1996"

Packet mode multimedia conferencing services over an isdn wide area network

Abstract: Real-time multimedia services are transmitted over a hybrid network including a nonguaranteed quality of service packet switched local area network and a circuit switched ISDN wide area network having a centralized multimedia bridge located within the wide area network. The local area networks and multimedia bridge are interconnected via ISDN routers. An algorithm executed by the multimedia bridge receives signals from the packet switched network and detects the absence of properties needed for real-time audio visual services. The data signals are processed to compensate for the absence of the properties and then are transmitted over the wide area network to enable real-time audio visual services.

Transport and control issues in multimedia wireless networks

Abstract: It is not an easy task in the UMTS environment to effectively design the transport and the management of traffic belonging to multimedia teleservices among those defined by ITURecommendations, due to the hard communication requirements which this kind of application can call for. In this paper the results of an overall research work, dealing with an effective management of “multimedia” and “multi-requirement” services in enhanced third-generation mobile radio systems, are presented. The contemporary use of several bearers, one for each traffic component of the service, is proposed as a reference scenario for the transport of multimedia services in future mobile radio environments. The effectiveness of this choice is guaranteed by providing for innovative control techniques, on top of a PRMA-based access protocol, ad-hoc developed to recognise and jointly manage the different parts of a unique multimedia traffic. For this aim, a two-level priority (static and dynamic priorities) mechanism is proposed to be adopted by the higher protocol levels of UMTS for the adaptation of call set-up, channel access, handover, and admission control procedures to the nature of multimedia services and for optimising the sharing of radio channel resources and the management of the reservation buffer. Achieved results demonstrate that the priority-based mechanism shows good performance especially during periods in which the system traffic load is high and well reacts to the worsening of multimedia service quality, both in terms of information loss and synchronisation of its different traffic components.

Infoscopes: Multimedia Information Systems

Abstract: Infoscopes will be the microscopes and telescopes of the information systems of the future. The emergence of information highways and multimedia computing has resulted in exponential growth in the availability of multimedia data. Most information in computers used to be alphanumeric. Increasingly information has been appearing in graphic, image, audio, and video forms. Many approaches are being proposed for storing, retrieving, assimilating, harvesting, and prospecting information from disparate data sources. Infoscopes will allow users to access information independent of the locations and types of data sources and will provide a unified picture of information to a user. Due to their ability to represent information at different levels of abstractions these systems must recover and assimilate information from disparate sources. In this chapter, we discuss requirements of these emerging information systems. We discuss basic architecture and data models for these systems. Finally, we briefly present a few examples of early infoscopes.

Mobility management in IP networks providing real-time services

Abstract: The evolution of IP toward the complete interworking among fixed and mobile hosts is called mobile IP. Several issues related to different aspects of the mobile IP definition have been singled out: impact of mobility on TCP/IP performance, route optimisation, authentication, reliability, location, addressing, etc. An important topic in the IP evolution is the provisioning of real-time services by employing signalling protocols like RSVP. A further step in this evolution will be to allow such real-time communications also between mobile hosts. This issue is addressed and a proposal for extending real-time services also to mobile hosts is presented.

Multimedia over the Internet

Abstract: The paper discusses the motivation, requirements, and the emerging technologies to carry multimedia services over the Internet.

A Model for Specification and Synchronization of Data for Distributed Multimedia Applications

Abstract: As network technology provides the capability to handle multimedia traffic and the demand of multimedia services increases, protocols are required for effective communication of multimedia data in a distributed environment. Synchronization is one of the key issues in a multimedia system. Most of the current approaches do not support an integrated solution to the problem of synchronization. In this paper we propose a mechanism for synchronization of multimedia data in distributed environment where the accuracy of the protocol can be tailored to the application. The system model supports live and video-on-demand service. We present a scheme where the specification of the temporal requirements provided by the application can be directly mapped to obtain the information necessary to enforce the synchronization required. We present two examples of specifying the temporal requirements and process of obtaining the information and present performance results of our simulation studies.

A layered approach for IN call modelling for the support of multimedia services in a B-ISDN environment

Abstract: This paper deals with the integration between the intelligent network and the B-ISDN for the support of advanced multimedia services. The intelligent network (IN) introduces new capabilities for service provisioning and service handling. On the other hand, significant steps in the B-ISDN standardisation have been made, promoting an advanced signalling system to support multimedia services. These services call for new requirements and introduce more complexity on the control protocols. For these reasons, it is evident that an integration of these two architectures will be very useful for the realisation of a global network, service independent, flexible and efficient in resource utilisation. We investigate the different possibilities for an IN/B-ISDN interaction; in particular we propose a new architecture for the basic call state model and for the service switching function, in order to fully exploit the advantages introduced by B-ISDN signalling.

Management of multimedia resources: from a generic information model to its application to an MPEG2 video codec

Abstract: New open service architectures provide a management framework for telecommunications services, telecommunications networks and computing resources. However, the introduction of multimedia applications in these architectures will require the management of the underlying multimedia resources (e.g., codecs, converters, etc). Multimedia resources are the basic components that support multimedia communications. In this paper, we tackle this issue by proposing a generic management information model for multimedia resources and then instantiate it for the management of an MPEG2 video codec. This information model provides a data representation of the multimedia resources in order to manage them efficiently.

Features of the ACCOPI Multimedia Transport Service

Abstract: In this paper, we present early considerations on the design of a multimedia transport service. The proposed design provides not only support for Quality of Service (QoS) and group communications, but also has the property to treat multimedia communications “as a whole”. This differs from most of the current transport services which transfer multimedia data as several independent monomedia.

A multimedia communication system

Abstract: In order to serve, to each of client terminals (221, 222, ...), programs and data most suitable for performance of the terminal (221), a server station (21) of a multimedia communication system of the invention sends a check program (51) before delivering data called from the client terminal (221). The terminal (221) performs certain calculations and graphic display according to the check program (51) and reports times needed for the check program (51) to the server station (21). The server station (21) selects programs and data most suitable for the terminal (221), enabling the terminal (221) to enjoy its high performance.

Animation within Mobile Multimedia On-line Services

Abstract: Suitable concepts have to be identified or developed that guarantee the effective usability of mobile multimedia information and services. A platform dedicated to the mobile infrastructure that bundles such concepts is currently being developed within the European ACTS project Mobile Media and ENTertainment Services (MOMENTS). The platform will offer multimedia products — information and services — to end users within service trials in a GSM-/DCS-1800-based mobile infrastructure. Further advanced developments, like wide band user channels, will be shown in a Technological Demonstrator. This paper concentrates on the handling of animation within wireless multimedia services.

Issues in networked multimedia services

Abstract: Future multimedia network services will provide integrated voice, graphics, text and video seamlessly on integrated transport networks. Key issues in this new paradigm are the need for application interoperability and quality of service. Issues of transport requirements and access networks have been investigated and a generic architecture for multimedia network services is described.

Multimedia service delivery with guaranteed quality of service

Abstract: Multimedia services, such as videoconferencing require network and systems performance guarantees in terms of throughput, delay, jitter etc. These parameters, also known as quality of service (QoS), factors vary from user to user and application to application. Existing networking infrastructures such as the Internet do not yet support guarantees of QoS. However we can expect such support in the future. This paper presents our research in experimentation and modelling of schemes for providing multimedia services with guaranteed QoS.

Networking multimedia system

Abstract: This paper is concerned with networked multimedia technologies. It describes the characteristics of the multimedia systems. It studies the World Wide Web for distributed multimedia data. It also presents a useful language Java used to support multimedia information. It presents the author's work on Java to interact with audio files.

Multimedia network integration and management

Abstract: Multimedia and its mystics multimedia technology and tools applications requirements network architectures network control techniques network management across divergent networks multimedia network control systems examples of multimedia network managment.

Teleservices and multimedia communications : Second International COST 237 Workshop, Copenhagen, Denmark, November 20-22, 1995 : proceedings

Abstract: Group support in multimedia communications systems.- Object-oriented framework for a scalable multicast Call modelling.- M-connection service: A multicast service for distributed multimedia applications.- GLASS: A distributed MHEG-based multimedia system.- Performance evaluation of the CSCW application JVTOS.- Multimedia teleservices modelled with the OSI application layer structure.- Service definition of a multimedia partial order connection.- Network support for multimedia communications using distributed media scaling.- The ACCOPI Multimedia Transport Service over ATM.- Towards a hybrid scheme for application adaptivity.- Admission control for end-to-end distributed bindings.- An enhanced admission control scheme for deterministic and predictive services.- Equitable conditional access and copyright protection for image based on trusted third parties.- Designing point-to-point interactive video applications.- RIVUS: A stream template language for capturing multimedia requirements.

Multimedia networks: the role of the network operator

Abstract: In the fast growing market of multimedia networks and services, acceptance-and hence commercial success-of a system will largely be determined by the quality, flexibility and extendibility of the services offered by it. This paper outlines the role an operator of a (public) network can play in offering multimedia services. It introduces the Level 1 Gateway as a means for the network operator to enter the services business. The target multimedia network provides a managed end-to-end switched, interactive service using broadband (ATM) technology.

Multimedia Call Control: A Centralized Approach

Abstract: To support multimedia services on a large scale, a powerful signaling system for broadband networks has to be provided. It has to enable arbitrary complex multimedia services with several participants, involving several media and heterogeneous terminal equipment. This paper describes a framework for an overall signaling architecture that fulfils those requirements. One of its basic principles is to perform call and resource control in a centralized manner, which is contrary to other advanced and traditional approaches. Another key feature of the proposed framework is an independent signaling system for connection control. One of the advantages of the new design is that no NNI signaling for call and resource control is required. Call control and the determination of special resources, like converters and conference bridges, is simplified. A cost optimization can be performed when locating the special resources. The architecture enables a straight forward inclusion of external providers of resource services. The autonomous connection control yields independence from the underlying switching and transmission technology, and it completely separates signaling for call and resource control from connection control. Hence it is feasible to have different providers for telecommunication services, resource services and bearer services.

Multimedia Application Services

Abstract: Progress in the field of semi-conductors and LSIs has made the size of computers smaller and smaller and brought us very powerful workstations (WSs) and personal computers (PCs). Digital switching and transmission technologies have realized an ISDN that provides various attractive telecommunication services. These computers and communication networks have become one of the most important social infrastructures for the 21st century. Computer systems were initially limited to character-based information, but recent WSs and PCs can easily manipulate multimedia information such as characters, figures, sound and image data. B-ISDN, which will be realized by ATM switching and optical transmission technologies, can effectively transmit multimedia data include audio and video.

Personal multimedia desktop system (PMDS)

Abstract: Developing multimedia audio and video services in LAN or VAN networks, especially group or personal desktop visual conference, audio and video broadcast and multimedia E-mail services, is one of the distinctive characteristics in the initial stage of the multimedia communication development. According to the service requirements of the FDDI campus network and the railway data network we researched into the constructions, combined models, and access performance of the multimedia desktop system (MDS) using personal computers (PCs) as our platforms. In addition, we developed an experimental MDS which can provide access to the network and realize various multimedia services. However, these are our initial work.

Modeling Service Activation in a Multimedia Environment

Abstract: The emergence of multimedia applications requires appropriate management and control activities to be provided and organized in an integrated framework. This article presents an architectural approach to the modeling of service activation processing in a multimedia environment.