Patent ID: 6754177
Filing Date: 2004-06-22
Classification: H04L,H04Q

Abstract:
A congestion control method for a network, said method comprising the steps of:allocating, for a pre-determined interval of time, a set of virtual paths between a set of source node and destination node pairs in the network; allocating, for the pre-determined interval of time, a set of maximum permitted rates to the allocated set of virtual paths, respectively; assigning, for the pre-determined interval of time, a set of burst access thresholds to a set of service classes, respectively, wherein the assigned burst access thresholds are less than or equal to the corresponding allocated maximum permitted rates; and determining, at one of the source nodes in the network, whether to admit at burst level on one of the allocated set of virtual paths a burst in traffic using a reserved bandwidth equal to a peak cell rate of the burst based on the allocated set of maximum permitted rates and the assigned set of burst access thresholds; wherein determining further comprises: detecting, at one of the source nodes, a beginning of the burst in the traffic; identifying, from among the allocated set of virtual paths, the allocated virtual path corresponding to the detected burst; identifying, from among the set of service classes, the service class corresponding to the detected burst; identifying, from among the assigned set of burst access thresholds, the burst access threshold corresponding to the identified service class; admitting the detected burst when the total reserved peak cell rate for all bursts that are in progress in the identified allocated virtual path plus the peak cell rate of the detected burst is less than or equal to the identified burst access threshold; and rejecting the detected burst when the total reserved peak cell rate for all bursts that are in progress in the identified allocated virtual path plus the peak cell rate of the detected burst is greater than the identified burst access threshold.