Showing papers on "IP Multimedia Subsystem published in 1994"

Multimedia Telecommunications Network and Service

Abstract: A multimedia telecommunications network (10) provides telephone service which may involve one or more of audio, video and data communications. In one example of the invention, the multimedia telecommunications network (10) contains a virtual meeting services complex (28) which provides multimedia telecommunications service to subscribers of the network (10). Multimedia telephone calls can be completed automatically by the virtual meeting services complex (28) in a manner similar to that now used to complete conventional audio telephone calls. The multimedia telecommunications network (10) containing this virtual meeting services complex (28) is able to connect together users having diverse equipment and is able to handle integrated and nonintegrated network access mechanisms.

Intelligent peripheral in video dial tone network

Abstract: A peripheral platform, such as an Intelligent Peripheral (IP), is a network subsystem for use in the Advanced Intelligent Network (AIN). The IP will assume some functions presently performed by the Integrated Service Control Point (ISCP) and central office switches. In an integrated network offering interactive broadband services as well as voice telephone services, the IP also performs gateway and/or server functions for broadband communications. Among its functional capabilities will be voice announcement and digit collection. The IP also offers speech recognition capabilities and an array of other enhanced telephone call processing features, such as voice or facsimile messaging. The peripheral platform or IP will be a separate network component that will communicate with the ISCP, which controls the AIN, through a data communication network that in the preferred embodiments is distinct from the telephone company switching offices, trunk networks and any associated interoffice signalling network. Gateway functionalities performed by the IP include communications port management of transmissions of information between subscribers and broadband servers, processing of billing information and session management.

Architectures for personalized multimedia

Abstract: Personalized multimedia on-demand services are fast evolving from a symbiosis of storage, network, and content providers. A major obstacle to their practical realization is the unprecedented cost of storage and transmission. Architectures and caching techniques can minimize the costs of delivering personalized multimedia programs across metropolitan networks. >

Improving utilization for deterministic service in multimedia communication

Abstract: Network-based real-time multimedia applications require guaranteed performance communication services. To provide guaranteed service, resources have to be reserved within the network. If reservation is based on the peak rate of each connection, the network will be under-utilized by guaranteed service traffic when the traffic is bursty. We first show that local deterministic delay bounds can be guaranteed over a link for bursty traffic even when the sum of the peak rates of all the connections is greater than the link speed. Compared to previous admission control conditions, the new result allows a multi-fold increase in the number of admitted connections when the traffic is bursty. We then show that this new result can be efficiently extended from a single switch to a network of arbitrary topology by using rate-controlled service disciplines at the switches. >

Communication systems supporting multimedia multi-user applications

Abstract: Multimedia multi-user applications are becoming more and more important. Intensive research is underway on the design of protocols and protocol entities for future communication systems supporting multimedia multi-user applications. The development of a service description ensures that protocol designs actually produce the required functional behavior. The authors explain the approach to the description of a multimedia multi-user service. An example illustrates the use of the service description in the design of communication systems. Next, they present the basic requirements of multimedia and multi-user communications. A call model underlies and structures the service description. Finally, the authors describe the service in terms of service elements. >

Resource Management in Multimedia Networked Systems

Abstract: Error-free multimedia data processing and communication includes providing guaranteed services such as the colloquial telephone. A set of problems have to be solved and handled in the control-management level of the host and underlying network architectures. We discuss in this paper 'resource management' at the host and network level, and their cooperation to achieve global guaranteed transmission and presentation services, which means end-to-end guarantees. The emphasize is on 'network resources' (e.g., bandwidth, buffer space) and 'host resources' (e.g., CPU processing time) which need to be controlled in order to satisfy the Quality of Service (QoS) requirements set by the users of the multimedia networked system. The control of the specified resources involves three actions: (1) properly allocate resources (end-to-end) during the multimedia call establishment, so that traffic can flow according to the QoS specification; (2) control resource allocation during the multimedia transmission; (3) adapt to changes when degradation of system components occurs. These actions imply the necessity of: (a) new services, such as admission services, at the hosts and intermediate network nodes; (b) new protocols for establishing connections which satisfy QoS requirements along the path from send to receiver(s), such as resource reservation protocol; (c) new control algorithms for delay, rate and error control; (d) new resource monitoring protocols for reporting system changes, such as resource administration protocol; (e) new adaptive schemes for dynamic resource allocation to respond to system changes; and (f) new architectures at the hosts and switches to accommodate the resource management entities. This article gives an overview of services, mechanisms and protocols for resource management as outlined above.

Network Layer Scaling: Congestion Control in Multimedia Communication with Heterogeneous Networks and Receivers

Abstract: Because of the admission control schemes in computer networks, in many multimedia communication scenarios it is not possible to get guaranteed quality of service for data transmission along the entire route from sender to receiver. In such cases scaling mechanisms can be used to overcome problems caused by resource congestion. Whenever resource bottlenecks are noticed, the multimedia traffic through these resources will be reduced for a limited time. The scaling scheme described in this paper uses mechanisms in the network layer to enable short delay times between detection of overload and the reduction of multimedia traffic. Network layer scaling allows priority-controlled regulation of multimedia traffic over network resources and adaptive handling of various paths and receivers. The monitoring and scaling strategies in the network layer and a prioritization scheme for multimedia stream packets are described.

Real-time multimedia systems

Abstract: The expansion of multimedia networks and systems depends on real-time support for media streams and interactive multimedia services. Multimedia data are essentially continuous, heterogeneous, and isochronous, three characteristics with strong real-time implications when combined. At the same time, some multimedia services, like video-on-demand or distributed simulation, are real-time applications with sophisticated temporal functionalities in their user interface. We analyze the main problems in building such real-time multimedia systems, and we discuss-under an architectural prospect-some technological solutions especially those regarding determinism and efficient synchronization in the storage, processing, and communication of audio and video data. >

GRAMS: a distributed multimedia service system

Abstract: This paper is on the design and implementation of GRAMS (Gopher-style Real-time ATM Multimedia Services), a multimedia system designed for a star configuration ATM LAN with the central server providing multimedia services to multiple users in real-time. It is also the initial step towards and the essential part of a distributed multimedia system over larger area networks.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

A distributed platform for interactive multimedia

Abstract: We describe a multimedia information and communications system called MEDIABASE. The system is under development at the Multimedia Information Laboratory at the University of Ottawa. MEDIABASE comprises three components: a multimedia user interface, a multimedia database client and server for storing, retrieving and updating multimedia documents, and a production server to capture video data and to create multimedia documents. All these components are integrated through a multimedia communications architecture using FDDI and ATM networks. >

A model for multimedia service creation and activation

Abstract: The emergence of multimedia applications requires appropriate management and control activities to be provided and organized in an integrated framework. This paper presents an architectural approach for the modeling of service activation processing in a multimedia environment. In particular, activation processes complying with this model provide the user with the capability of devising, creating and controlling the required composite multimedia service by using elementary services provided by the network as building blocks. The model introduced in the paper has been effectively used as a basis for the development of a network environment providing prototypal services of Multimedia Cooperative Editing (MCE). >

The impact of distributed multimedia systems on computer support for co-operative work

Abstract: Neil Williams, Gordon S. Blair, Geoff Coulson,Nigel Davies and Tom RoddenComputing Department,Lancaster University,Bailrigg, Lancaster,LA1 4YR,UK.Tel. +524 593054email [nw,gordon,geoff,nigel,tam]@comp.lancs.ac.ukABSTRACTRecent advances in distributed multimedia technologies are likely to have asignificant impact on the co-operative work practices of organisations.However, at present there is little practical experience with distributedmultimedia systems. This paper examines the potential for multimedia systemswithin a particular end user organisation. A pilot multimedia informationsystem is described which has been designed to support a specific co-operativeworking scenario identified within the organisation. The paper concludes thatmultimedia can have a significant impact on co-operative working. However,considerable attention must be given to the required system support for suchapplications. The development of integrated multimedia information systems isseen as particularly important. Without this, the full potential of multimedia andco-operative working cannot be fully realised.1. INTRODUCTIONCo-operative working involves a number of people working together to achieve acommon goal. The distribution of organisations, however, often requires that personnel areforced to work with colleagues who are situated remotely. The geographic distancebetween personnel constrains the degree to which they can collaborate. Communicationstechnologies are important in helping to overcome these constraints and achieve the desiredlevel of remote co-operation. Until recently, however, communications technologies havefailed to provide the required level of support for remote user interaction. For example,technology constraints have restricted computer support for co-operative working (CSCW)to a limited set of media types. The majority of applications have been restricted to text andgraphics communication, but have not been able to exploit media types such as audio andvideo. Those systems developed to provide co-operative working in conjunction with audioand video have been forced to use non-digital networks for these more demanding forms ofmedia. Such systems present the user with a non-integrated information system.However, advances in networking technology and the availability of multimediaworkstations have led to the emergence of distributed multimedia systems. Such systemsare able to support a full range of media including text, graphics, image, audio and video in

Multimedia communication networking architecture model for high speed network

Abstract: This paper describes and discusses the modeling of multimedia communication networking architecture suitable to high speed networks such as LAN, B-ISDN, etc. for the flexible management and rapid introduction of services. In this model, the applications are deployed in units of software building blocks called group call server, service control server, resource management server and client agent. Each building block provides a layered view for the effective management of the multimedia network resources and services. In this paper, we propose a service scenario scheme and multimedia logical devices model for the flexible generation and effective management of services, and abstracting the network resources, respectively. Finally, this paper presents an architecture evolution model toward interoperability in a distributed processing environment (DPE). This can be applied for interoperability between multimedia network resources provided by different vendors. >

From Broadband Network Services to a Distributed Multimedia Support-Environment

Abstract: We are on the brink of another major step in the age of “information”, stimulated by: Firstly multimedia computing characterized by a wide range of potential applications that combine information sources such as voice, graphics, hifi quality audio and video. Secondly advances in network technology which have made it feasible to build high-speed networks operating at hundreds of Mbit/s over long distances. Consequently distributed processing in the new information age will have to support the Quality of Service (QoS) requirements of the new multimedia applications and be able to exploit in full the increasing capabilities of the new broadband networks.

A terminal-based approach to multimedia service provision

Abstract: We describe an architecture that supports networked multimedia applications. The architecture is based on a separation of multimedia stream processing and application processing. Applications reside in application pools whereas media stream processing is performed in multimedia terminals. An application controls a set of terminals that exchange multimedia data streams-directly between each other A tele-teaching and a home shopping example demonstrate important aspects of our architecture. >

Multimedia networking: applications and challenges

Abstract: This paper summarizes a talk given at the Twelfth Annual ACM Symposium on Distributed Computing, It presents a perspective on the evolving National Information Infrastructure, focussing on some of the multimedia applications and associated technical issues and challenges. The talk was illustrated by several video clips which, due to the constraint of the publishing format, could not be included in this paper.

Multimedia system architectures

Abstract: In this paper, we describe a multimedia system architecture consisting of: (1) an information management subsystem, (2) a storage subsystem, and (3) a network subsystem. Whereas the information management subsystem provides means for identifying the set of multimedia objects that may be pertinent to a client’s query, the storage subsystem ensures that multimedia objects are efficiently stored and retrieved from secondary storage devices. The network subsystem, on the other hand, guarantees timely delivery of the multimedia objects accessed by the storage subsystem to each of the client sites. The main goal of this paper is to identify and discuss the research issues involved in designing each of these three subsystems.

An Interactive Cable Television Network for Multimedia Applications

Abstract: Nowadays there is a lot of interest in how to utilize the huge data capacity of existing cable television networks for providing a range of new services. In this report we will briefly look at what kinds of new services need to be provided and then go on to describe a network architecture that can facilitate their quick deployment with low initial infrastructure costs, while providing enough flexibility to adapt to future changes to both capacity requirements and network infrastructure.

Requirements and solutions for integration of multimedia services on the desktop

Abstract: The use of networked multimedia by various industry sectors, in relation to particular business activities. Effective multimedia systems are required to handle very large amounts of information represented in a variety of forms, from unformated text through to full motion video. Full desktop multimedia solutions will require development work in areas beyond the PC or workstation itself namely; LANs, network multimedia servers, and software tools. Also, the communication networks must provide several key features such as high capacity, variable bandwidth, synchronisation of different types of traffic and support for different types of data flow (isochronous and asynchronous). >

Multimedia transport and teleservices : International COST 237 Workshop, Vienna, Austria, November 13-15, 1994 : proceedings

Abstract: Towards a complete multimedia mail: Use of MHEG in standard messaging systems.- A mail-based teleservice architecture for archiving and retrieving dynamically composable multimedia documents.- The global store server - a multimedia teleservice component.- From broadband network services to a distributed multimedia support-environment.- Managing shared ephemeral teleconferencing state: Policy and mechanism.- Computational components for synchronous cooperation on multimedia information.- A binding architecture for multimedia networks.- Implementation of a end-to-end quality of service management scheme.- A formal description technique supporting expression of quality of service and media synchronization.- On the synchronization mechanisms for multimedia integrated services networks.- Efficient support for multiparty communication.- QoS negotiation for multicast communications.- Support for high-performance multipoint multimedia services.- Providing support for data transfer in a new networking environment.- Congestion avoidance for video over IP networks.- Network layer scaling: Congestion Control in multimedia communication with heterogenous networks and receivers.- Resource requirements for VBR Mpeg traffic in interactive applications.- Transmission of MPEG2 applications over ATM networks.- Protocols for multimedia conferencing - an introduction to the ITU-T T.120 series.- A platform for multimedia telecooperation bridging endsystem heterogeneity.- A scheme for multimedia and hypermedia synchronization.- Integration of existing applications into a conference system.- The CIO multimedia communication platform.- Broadband multimedia and collaboration tools. IDEA project.

A Multimedia Application Adaption Layer (MAAL) Protocol

Abstract: The goal of this research is to resolve the difference between variable-sized packets (or frames) in multimedia application and fixed and small size cells in Broadband Integrated-Services Digital Networks (B-ISDN) with Asynchronous Transfer Mode (ATM). In particular, I propose a new operation mode of multimedia application adaptation layer (MAAL) as a supplement of existing four AAL types. The new AAL protocol supports streams of co-related cells in order to reduce the processing overhead and simplify the traffic scheduling at the application level. Furthermore it re-synchronizes the multimedia traffics through the Asynchronous Transfer Mode network interface.

Interfaces for handling multimedia communications systems

Abstract: This paper aims to address interface considerations for multimedia conferencing facilities.

The CIO Multimedia Communication Platform

Abstract: Within the context of an european networking project (RACE 2060 CIO) the University of Stuttgart is developing a common “Communication Platform” which can be used for (real-time multimedia) data transmission and runs on top of several operating and transport systems. Primary intention is to allow for development of multimedia applications that make use of advanced networking features which will soon become available. While early implementations of the Communication Platform will have to simulate any features missing in current transport protocols, future advances in network research may be included without a need for changing the service, its programming interface, or any applications relying on the CIO Platform. Beginning with a short overview of the whole project this paper briefly describes the Communication Service and its interface focusing on special characteristics of the CIO Communication Platform.