Performance analysis of application-level multicast routing algorithms for supporting multipoint interaction synchronization

Multipoint Video Conferencing (MVC) where multiple participants can be simultaneous sources of video requires low delay, low packet loss and multipoint interaction synchronization. However, the synchronization issue is ignored by existing application-level multicast schemes and usually, it is addressed by a dedicated synchronizing controller at each peer. The controller needs to implement complicated time-consuming operations to synchronize multiple interactive media streams. Unlike the existing application-level multicast schemes, this paper introduces an idea that the synchronization problem is solved in the process of application-level multicast routing, without using the dedicated synchronizing controller. Furthermore, the lowdelay multicast communication is achieved on base of the idea. The contributions of this paper include: 1.the concept that application-level multicast routing algorithms support multipoint interaction synchronization is defined by us; 2.an effective lowdelay multicast routing algorithm that supports multipoint interaction synchronization is proposed; 3.performance analysis of our algorithm and the existing similar algorithm is carried out. Finally, simulation experiments demonstrate our algorithm is correct and effective.