A multicast routing protocol supporting multiple QoS constraints

The main goal of QoS multicast routing is to construct a multicast connection (usually in the form of a shared tree) meeting multiple QoS constraints. Unfortunately, QoS routing is generally a NP-complete problem when there are multiple routing objectives to meet. In this paper, we propose a new QoS multicast routing protocol, in which a multicast tree meeting multiple QoS constraints can be constructed in a distributed fashion using local network states at routers. We compare the performance of our scheme with other QoS multicast routing protocols through extensive simulations, and find that our protocol always performs better than them in terms of blocking probability and set-up latency, and it generates fewer overheads at heavy network loads.