一种分层分簇的应用层组播方案  

Application-layer multicast scheme based on layered and clustering

作　　者：张云[1] 禹继国[1] 任庆杰[1] 

机构地区：[1]曲阜师范大学计算机科学学院,山东日照276826

出　　处：《计算机工程与应用》2010年第35期78-82,共5页Computer Engineering and Applications

基　　金：国家自然科学基金(No.60373012);山东省自然科学基金(No.ZR2009GM009;No.ZR2009AM013);山东省中青年科学家奖励基金(No.BS2009DX024)~~

摘　　要：在对NICE应用层组播协议研究的基础上,提出了一种新的应用层组播方案LCcast。它采取分层分簇的结构特征,从簇中选择出能力强的领导节点用Chord环组织起来。在数据传输方面,使用Chord环中定义的指向表并结合Dijkstra算法生成最小延迟的组播树,从而减少了传输延迟。同时,为了防止数据包丢失,对每一个簇选择了一个备用领导节点集合。仿真结果表明,LCcast组播方案在一定程度上减少了时间延迟,提高了平均数据传输率,降低了控制开销和领导节点的负载。This paper proposes LCcast,a novel scheme based on NICE,which gives P2P application-layer for multicast.It us-es the hierarchical clustering structure,and makes the powerful leader nodes from all the clusters organized by the Chord in the result of extracting an implicit multicast tree easily.It uses the finger table defined in the Chord and the Dijkstra algo-rithm to establish the minimum delay multicast tree,and chooses a number of backup leader nodes in the cluster to form a stack in order to prevent the packet loss.Simulation results indicate that the scheme can improve the data transmission rate and reduce the control overhead and the load of the leader node.

关 键 词：NICE 应用层组播 LCcast 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]