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: Existing multicast group management solutions fall short of providing adequate support for secure group integrity maintenance. This is especially true in the multimedia context, where, on top of intra-group integrity, inter-group (i.e. inter-media) considerations have to be taken into account. We demonstrate, along a comprehensive example, the applicability of our integrity framework for multicast groups, which includes integrity conditions imposed on groups describing valid group states and state transitions as well as action and transition policies for maintaining integrity. Related security issues are analyzed and discussed for data and control plane.
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    ABSTRACT: Observing that the ever-increasing availability of WiFi-enabled gadgets is forming a technological basis for networked ad-hoc communities, and noting that such communities are actually user groups calling for group management schemes, we propose in this position paper a new group integrity management approach in support of mobile ad-hoc communities. This approach, based on our earlier work in the multicast domain, provides for a powerful yet flexible way to express and enforce integrity conditions to be imposed on groups, such as mandatory rules for group membership composition. Along real-world examples, we survey requirements, discuss our group integrity management scheme, and sketch an appropriate system architecture.
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    ABSTRACT: This paper deals with the Quality of Service (QoS) negotiation for multicast connections. First, we show that in the multicast case, the QoS parameters may be separated into two classes, namely the parameters whose scope is the whole multicast connection and those whose scope is limited to each receiver separately. Then, after a brief presentation of the enhanced QoS defined in the OSI95 transport service, we examine how the QoS negotiation schemes used in the peer-to-peer ISO and OSI95 transport services can be extended to multicast connections. Finally, a practical issue about QoS negotiation for multicast connections is presented.
    01/2006: pages 199-218;

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