A Group Communication Framework

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ABSTRACT This paper presents a general architectural model for group communications which are communications that may involve more than two parties. The concept of group is presented and the concept of group association, which is an instance of group communication, is analysed. Those group associations are modelled as a set of basic components called multicast conversations. At the service boundery, new architectural concepts are introduced to identify a group association as well as its multicast conversations. Then, facilities to handle the group associations and the multicast conversations are defined and the properties of data transfer on a group association are examined. Finally, the paper deals with aspects of group management. 1. Introduction One of the key issues to fulfil the requirements of modern distributed applications such as teleconferencing, multimedia distribution or client/server applications, is the efficient exchange of information between multiple entities, that is group or...

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    ABSTRACT: Despite its obvious suitability for distributed multimedia applications, multicasting has not yet found widespread application. Having analyzed shortcomings of today's approaches, we devise in the GCAP project a new end-to-end transport architecture for multimedia multicasting that supports partial order and partial reliability. In this paper, we argue that, at the network layer, single-source multicasting (PIM-SSM) should be chosen. Consequently, our Monomedia Multicast protocol provides, along with reliability and QoS monitoring functionality, an ALM based multicast solution referred to as TBCP (Tree Building Control Protocol), to be used as back channel for SSM, e.g. for retransmission requests. On top of the Monomedia protocol, our Multimedia Multicast protocol handles multimedia sessions composed of multiple monomedia connections: The FPTP (Fully Programmable Transport Protocol) allows applications to specify, through its API, the (global) synchronization and (individual) reliability requirements within a multimedia session. Our group management approach is focused on group integrity.
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    ABSTRACT: : In recent years computers have developed very rapidly from simple processing machines to sophisticated communication systems employing multiple media. Computers are imcreasingly used for all kinds of man-machine and interpersonal communication and co-operation. Many of these applications involve multiple communicating entities as well as multimedia. However, in general no sufficient support for multimedia group communication is yet available. In this paper we first analyse existing systems offering group support at different levels of the system and communication architecture. Subsequently a study on multimedia group application requirements is described. It is mainly concerned with highly interactive applications such as CSCW. The study is based on the examination of existing systems, system scenarios and ethnographical studies. To describe the multitude of characteristics and requirements of these applications in a structured and comprehensive way a set of group application charact...

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Jun 4, 2014