In this paper, we designed a new multicast tree construction mechanism in order to support overlay multicast with scalability and QoS. The architecture we introduce efficiently transmits streaming data to the users from multicast source in an environment in which non-multicast network and multicast network. We have introduced loosely-coupled TCP connection in order to support efficient and reliable overlay multicast. Besides, by defining a new service type to flow label of IPv6 header, a selective adoption of FEC and a distinctive transmission became possible. In order to verify the effect of the solution we suggested, we embodied an environment which is similar to the actual service environment by a simulator and tested it. The result of the test shows that the proposed method is more efficient than the traditional unicast approach method and the existing overlay multicast.
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