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Communication among multiple entities is becoming more and more widespread in computing and telecommunications. Although many existing communications protocols and services do offer some limited support for multicast or group communication, the new requirements of multipeer applications make it difficult to find efficient and comprehensive solutions. In this paper we discuss the required characteristics...
The proposed approach for the multicast Call modelling framework considers logical entities participating in the Call process. A new mediator for the multicast Call establishment is introduced — the multicast agent (MCA), which is a software object moving across the internetwork and delivering to all members of the group all functionalities needed for reliable and flexible participation in a multicast...
New high speed networks and the requirements of users for the support of interpersonal communication in a computerised heterogeneous environment demand for new communication services. These services have to provide support for multimedia group communication. In this paper we introduce a multicast transport service for multimedia group applications called M-Connection Service. It is a protocol independent...
This paper is about GLASS, a distributed multimedia system that is currently under development. The multimedia department of the IBM European Networking Center in Heidelberg, Germany, participates in the project along with other industrial and university partners. GLASS is an acronym for Globally Accessible Services, expressing the system's wide range of possible applications. Interactive TV scenarios...
The primary contribution of this paper is an experimental evaluation of the architectural design of an application for computer supported cooperative work (CSCW) as well as an investigation of the traffic pattern generated by the application. The evaluation is done in a local area ATM network based on instrumentation of the main data path combined with resource monitoring of the end-system. The evaluation...
This paper looks into the communications capabilities that are required by distributed multimedia applications to achieve relation preserving information exchange. These capabilities are derived by analyzing the notion of ‘information exchange’ and are embodied in communications functionalities. To emphasize the importance of the users' view, a top-down approach is applied. The (revised) OSI Application...
Starting from a new concept of connection, the partial order connection (POC), we introduce the design principles of a multimedia partial order Transport connection (MM-POC), that allows one to define a multimedia QoS consistent with multimedia application requirements. A complete definition of the proposed multimedia partial order service (MM-POS) is provided including complete definition of the...
This paper focuses on the transmission of continuous multimedia streams in packet switched networks, through the use of distributed media scaling techniques. These techniques make it possible for any receiver of a multicast stream to get best possible quality, while avoiding any waste of network resources. Enabling distributed media scaling requires to design network nodes with media scaling capabilities,...
This paper discusses some of the issues in mapping the ACCOPI Multimedia Transport Service (AMTS) over the ATM (Asynchronous Transfer Mode) network technology. The AMTS is a transport service mainly designed to support multimedia applications. ATM offers two important characteristics required by multimedia applications (namely QoS and multicast). We first discuss general architectural issues such...
This paper presents a framework for providing the infrastructure necessary to support adaptive applications. The suitability of the proposed framework is demonstrated by first analysing some advantages and disadvantages of methods reported in the literature for the development of adaptive applications. We report on some experiments that support our analysis. We define some requirements for adaptive...
The paper presents an admission control scheme for distributed bindings with guaranteed end-to-end transfer delay in an object-based architecture for real-time heterogeneous distributed sytems. The scheme is based on recent results on fixed priority scheduling by Tindell [15, 16].
Providing guaranteed Quality of Service in a packet switched network is still a research issue. In particular, real-time video and audio applications require deterministic end-to-end delay bounds and a limitation of the delay jitter. The scheduling disciplines used within the network nodes must be able to provide local delay bounds. Admission control algorithms verify whether the scheduler can accept...
Image communication needs new cryptological tools for conditional access, copyright protection and image authentication. The aim of this paper is to overview the corresponding systems' features. The design of efficient copyright protection by watermarking images and image authentication by signatures is also briefly discussed. It is shown that equitable systems need the use of a Trusted Third Party,...
High speed networks provide sufficient bandwidth for VBR video applications. Interactive point to point video such as tele-teaching needs a reduced gap between the coding and decoding procedures in software based tools. Efficient algorithms for video coding do not satisfy this requirement. This paper presents a video compression algorithm based on multi dimensional Discrete Cosine Transform...
Object based architectures, such as the standardized reference model for Open Distributed Processing (ODP), must not only provide for the simple client-server styles of interaction found in data processing, but must also support the rich variety of different communication configurations and dependencies that are found in multimedia applications. To do this, ODP defines both simple two-party communication...
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