一种适用于动态/移动环境的新的组播协议

组播协议由于能够有效的利用网络带宽并降低服务器的负担因而受到广泛的关注.其中的共享树组播协议由于具有良好的扩展性而得到更多的支持,然而目前的共享树组播协议在动态移动环境中的性能很差,一些改进协议(单核移动协议)虽然可以很好的提高原有协议的性能但是所需要的额外开销很大.针对这种情况,本文提出了一种新的共享树组播协议-动态多核协议,该协议能够根据组播成员的分布动态的渐进的调整组播树的形状,从而能够在低开销的情况下为移动用户提供良好的性能.计算机仿真和数学分析都表明动态多核协议要明显优于共享树组播协议和单核移动协议.

A New Multicast Protocol for Dynamic/Mobile Environment

Multicasting has gained much attention in recent years because it can efficiently utilize network bandwidth and reduce the load at application servers.The shared tree multicast protocol is more preferable due to its good scalability. At the same time, more and more mobile users require to participate in multicast communication. However, current shared tree multicast protocol performs poorly in dynamic/mobile environment. Some proposed protocols-one core migration protocol, improves the performance of shared tree protocol at the expense of large overhead in tree adjustment. This paper presents a new shared tree multicast protocol-dynamic multi-core protocol. This protocol can adjust the multicast tree according to the locations of multicast group membership gradually and thus provide good performance to group members with low cost. Computer simulation and mathematical analysis both show that dynamic multi-core protocol outperforms old shared tree protocol and one core migration protocol.