关键词: 组播, 应用层组播, 协议, 对等网络, 延迟

Abstract:

In the existing structured peer-to-peer (P2P) application layer multicast schemes , the end-to-end delay from the source to group members is high and the multicast delivelγtree is unstable. In order to overcome these demerits , this paper presents a new P2P application layer multicast protocol named DOMulti. In this protocol , the Tapestry routing and the data location service are utilized to construct a multicast delivelγtree with bounded depth and constrained out-degree of node. As there are no non-group members in the deliverγtree ， the transmission delay between the source and group members can be optimized and the stability of the tree can be improved. Simulated results indicate that , as compared with the existing protocol , DOMulti is of distinct advantages in terms of end-toend delay and is more suitable for the delay-sensitive multicast applications in P2P environment.

Key words: multicast, application layer multicast, protocol, peer-to-peer network, delay