摘要
视频会议和其它对等式实时分布应用要求实时对称的多点传输．各方独立的Ｍｕｌｔｉｃａｓｔ树将消耗大量的资源，不能完全满足对称的多点传输要求，为此文中提出一种连接体系，将各方独立的树合并起来形成多点连接，而对于具体的多点传输，它的Ｍｕｌｔｉｃａｓｔ路由树在这个多点连接上构成．这种体系较好地满足了视频会议中多点会话对称的传输要求，具有较高的效率．同时，文中采用网络的分层图表达来简化和降低多点连接构成的运算复杂度，并给出了相应的多点连接构成算法．
Videoconferencing and other peer to peer real time distributed applications require real time symmetrical multipoint transfer. Multicast trees of each participants will consume a large quantity of resources, and cannot meet fully the need of symmetrical multipoint transfer in the “closed type” group communication. Therefore, a multipoint connection (MC) architecture is proposed in the paper. An MC which connects all participants may be regarded as being constituted by “merging all directed multicast trees”. A multicast tree is built on the MC when a participant multicasts data to others. Hence, multicast routing procedure is divided into two parts in order, that is to say, building MC on the backbone and building multicast tree on the MC. The manner reduces greatly the whole complexity of building multicast trees during the multipoint session and supports well the rapid switch of floor. The architecture meets well the need of symmetrical transfer in the multipoint session like videoconferencing, and is efficient. The paper also takes advantage of the hierarchical graph representation of networks to simplify and reduce the computational complexity of building MC, and an algorithm for building MC based on the hierarchical graph representation is proposed in the appendix of the paper.
出处
《计算机研究与发展》
EI
CSCD
北大核心
1999年第2期175-181,共7页
Journal of Computer Research and Development
关键词
组通信
Multicast树
多点连接
视频会议
多媒体
group communication, multicast tree, hierarchical graph representation, multipoint connection
