Due to the existing defects of IP multicast, which is difficult to be expanded and managed, the researchers put forward application layer multicast. Real-time transmission is an important application field of application layer multicast technology. However, it has strict requirements for the network delay. This paper firstly analyses the delay's composition of application layer multicast and the rule of the distribution of the nodes' session time. And then, according to these factors, we propose a multicast tree construction algorithm concernin...
