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An Algorithm of Constructing Multiple Tree for Group Multicast with Bandwidth Constraint  

구봉규 (KT 기술연구소 네트워크 서비스 개발팀)
박태근 (포항공과대학교 컴퓨터공학과 네트워크 및 분산시스템 연구실)
김치하 (포항공과대학교 컴퓨터공학과 네트워크 및 분산시스템 연구실)
Abstract
Group multicast refers to the kind of multicast in which every member of a group is allowed to transmit data to the group. The goal of routing algorithms for group multicast is to construct a set of low cost multicast trees including all the group members with QoS (e.g., bandwidth) constraint. There have been several algorithms proposed: source tree and shared tree approaches. However, the latter approach has a low success rate in constructing a shared multicast tree, and the former approach suffers from high control overhead and low scalability as stoup size increases. In this paper, we present a heuristic algorithm which varies the number of multicast trees according to the network load. The simulation results show not only that our algorithm outperforms the shared tree approach in terms of the success rate, but also that it has lower control overhead than the source tree approach while guaranteeing the same success rate.
Keywords
Group Multicast; Source Tree; Shared Tree; Hybrid Algorithm;
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