Managing Group Dynamics and Failures in QoS Multicasting

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The recent proliferation of QoS-aware group applications over the Internet has accelerated the need for scalable and efficient multicast support. In this article, we present a multicast "life-cycle" model which identifies the various issues that are involved in a typical multicast session. During the life-cycle of a multicast session, three important events can occur: group dynamics, network dynamics, and traffic dynamics. The first two aspects are concerned with maintaining a good quality (e.g., cost) multicast tree taking into account member join/leave and changes in the network topology due to link/node failures/additions, respectively. The third aspect is concerned with flow, congestion, and error control. In this article, we examine various issues and solutions for managing group dynamics and failure handling in QoS multicasting and outline several future research directions.

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Available from: Manimaran Govindarasu, Dec 04, 2014
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    • "QoS routing consists of determining a path through the network which has adequate resources to satisfy the QoS requirements of a connection, while simultaneously achieving global efficiency in network resource utilization. QoS routing can be classified into unicast routing and multicast routing [28] [33] [36] [41] [43] [51] [77] [78] [82] [83] [91] [102] [103] [106] [122] [128] [133] [135] [142] [143] [145] [147] [152] [155] [158] [159] [161] [163] [166]. It can be further classified as intra-domain routing and inter-domain routing. "

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    ABSTRACT: The migration of classic Internet to support real time and multimedia applications (videoconference, VoIP) require improvement of the network level service. Since several real-time and multimedia applications are multicast, our interest is to integrate Diffserv and multicasting in order to satisfy QoS requirements of the multicast group. The problem on which we are concentrating in this paper is related to providing QoS requirements for multicast applications using Diffserv and principally on overload traffic, which may be created by replication of multicast packets in Diffserv domain. In this case, the policing component in Diffserv routers may perform dropping packets and because core routers are working by aggregation, thus other traffic (the rest of traffic) may be affected. In this paper, we present a new protocol called control for QoS-based multicasting in Diffserv (CQMD) to resolve the multicast and Diffserv integration problem. This paper shows under what conditions the new member can be accepted into the multicast group in Diffserv domain. In addition CQMD can achieve QoS-satisfaction, ensure protection for other traffic in the Diffserv domain, good resources management and incur less message overhead.
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