On the use of dispersity routing for fault tolerant realtime channels

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Abstract
This paper presents a taxonomy of dispersity routing schemes designed to provide fault‐tolerant realtime communication. Our model involves the provision of dispersity at the application level, rather than in the physical layer as in traditional uses of dispersity. We assume a connection oriented realtime communication service such as that provided by the Tenet Suite 1 or Asynchronous Transfer Mode (ATM) networks. We use the ideas of dispersity routing, redundancy, disjoint paths, and hot and cold standbys to design and classify a set of schemes that can provide a range of fault‐tolerant realtime services. The classification provides a convenient framework, which we use to discuss the properties of the schemes and to conduct simulation experiments. We compare the service provided and the costs of our schemes to other approaches to fault‐tolerant realtime communication, such as the Internet approach. We conclude that dispersity routing is a flexible approach to increasing the fault tolerance of realtime connections, which can provide a range of improvements in service with a corresponding range of costs.

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