DOMulti:一种延迟优化的P2P应用层组播协议

DOMulti:A Delay-Optimized P2P Application Layer Multicast Protocol

为克服现有P2P应用层组播方案中存在的转发延迟较大、组播转发树结构不稳定等问题,提出一种新的P2P应用层组播协议——DOMulti.该协议利用Tapestry路由和定位机制构建了深度有界且节点出度受限的组播转发树,该转发树不包含非组成员节点,从而优化了源到组成员节点间的传输延迟,提高了组播转发树结构的稳定性.仿真结果表明,与现有方案相比,DOMulti在端到端延迟方面有明显的优势,更适合于P2P环境中的延迟敏感型组播应用.

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 delivery tree 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 delivery tree with bounded depth and constrained out-degree of node.As there are no non-group members in the delivery tree,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-to-end delay and is more suitable for the delay-sensitive multicast applications in P2P environment.