Architectural and protocol frameworks for multicast data transport in multi-service networks

The paper presents architectural and protocol techniques for multicast transport of multi-service data (such as video, audio and graphics). A tree-structured channel in the network is employed as building block for constructing multicast transport services. Data from different sources are multiplexed over a shared tree channel for reaching destinations through intermediate network nodes and links. The choice of multicast architecture is based on the extent of sharing of common links in a tree across multi-source data flows to allow finer degree of link bandwidth allocation control and reduce the fixed cost of links for data transport. The canonical network substrate so constructed exemplifies a 'programmable network' that may be 'plugged-in' with QOS and flow parameters to instantiate the network behavior for matching the needs of each application. This philosophy is in alignment with the evolving 'Internet Service Layer' functionalities. The paper describes the functional and protocol elements of multicast architectures to support the 'programmable network' view. It also describes the salient features of an implementation embedding these architectures.

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