TapMulti: A scalable and low-delay application-layer multicast protocol on tapestry overlay network

In this study, we propose a low-delay ALM protocol named Tap Multi on Tapestry to achieve scalability and low-delay., In Tap Multi protocol, a delivery tree is designed to reduce end-to-end delay and improve stability of multicast system. This low-delay delivery tree is constructed on Tapestry and it can guarantee a tradeoff between delay and network-traffic load of multicast system by constraining width (maximal out-degree of node in the delivery tree) and depth of the delivery tree. Moreover, the efficient and proportional route mechanism of Tapestry is exploited to decrease the control cost to maintain multicast delivery tree. Simulated results indicate that, compared with other existing ALM approaches on Tapestry, Tap Multi is of distinct advantages in aspects of end-to-end delay and control cost.