Importance

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Abstract

The invention provides a method and system for selecting routes in a switching network with resource reservation, such as an ATM network. A set of routes are periodically precomputed, so that routes are known between any sending node and any receiving node, subject to resource reservation requirements. Each incoming call has its resource requirements, such as call size, compared with a selected threshold, and if the requirements exceed the threshold, a route is dynamically recomputed for the call. Other aspects of routing may be responsive to the calls' resource requirements. For example, a ratio of required resources with quality-of-service restrictions to required resources without such restrictions may be used to determine whether to reject the call, responsive to the call's resource requirements. The call size may be compared against another selected threshold, and the decision to determine whether to use that ratio to reject the call may be made responsive to comparisons against one or both thresholds.

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First Claim