基于二维网状结构的应用层组播协议研究  

RESEARCH ON APPLICATION LAYER MULTICAST PROTOCOL BASED ON TWO LAYER NETWORK ARCHITECTURE

作　　者：许建真[1] 王明[1] 梁克会[1] 

机构地区：[1]南京邮电大学计算机学院,江苏南京210003

出　　处：《计算机应用与软件》2011年第9期198-200,288,共4页Computer Applications and Software

摘　　要：为了改善网状优先的应用层组播协议可扩展性差等缺点,提出一种新的应用组播协议,协议采用特殊的二维层次结构。在低层,将距离近的结点划分为同一个域,域内成员组织成车轮状,域成员只和邻居结点交换信息,减少了维护通信量。在高层,将距离较远的域首组织成网状结构,上下层通过不同的路由算法并行地传输数据,使得数据可以尽快到达远处的结点,提高了传输效率。仿真结果表明,该组播协议具有较小的控制开销、链路压力和端到端延迟。To remedy the poor scalability of mesh-first Application Layer Multicast（ALM） protocol,the paper proposes a new ALM protocol that uses a special two-layer hierarchy.At the lower layer,nearby nodes are clustered together to form a wheel,inside which each member exchanges information only with its neighbors,so that the amount of maintenance information is reduced.At the higher layer,cluster leaders that are distant from each other are organized to a mesh structure.The two layers parallelly transfer data with different router algorithms to help them reach distant destinations as soon as possible.Simulation results show that the multicast protocol saves control cost,relieves link stress and speeds up end-to-end communication.

关 键 词：应用层组播 网状结构 二维网状 车轮结构 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]