Its characteristic is that the system organizes data flow according to channel,and each channel contains information that is needed by clients to join application layer multicast or IP multicast,host may decide to adopt IP multicast or application layer multicast to receive streaming media data according to channel information.

Then the network-layer anycast is given according to the limitations of application-layer anycast.

Network layer multicast can effectively implement the one-to-many communication,and how to use network layer multicast technology to carry out the stream media living broadcast system is one of the currently hotspots.

A new router-aided multicast network tomography method is proposed to estimate the spatial-temporal distribution of network performance.

The arithmetic described in this paper is based on multicast network tomography end-to-end measurement,computing the loss rate.

This paper introduces matroid into network coding,transforms an arbitrary network to a multiple-unicast network which has the same solvability property,and replaces the complicated nodes in the network with a gadget,made all the nodes in the network have the same form.