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AssigneeLucent Technologies Inc.
InventorsLofti Benmohamed, Yung-Terng Wang, Wing Cheong Lau
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An improved flow control method for ABR service in an ATM network. In particular, a dual local/global ingress flow control method for ABR service in a distributed ingress queueing switch including a plurality of ingress buffer-pools, at least one shared buffer-pool and a plurality of egress buffer-pools. Utilization of the egress port of each shared buffer-pool is periodically measured and together with the current state of the global-ingress control forms the basis for toggling global-ingress control in an active/inactive state. Queue-length based flow control algorithms such as DMRCA are applied to each resource management cell for the egress subport queue and ingress flow queue through which the resource management cell passes to determine the egress and local-ingress congestion marking values, respectively, for the resource management cell. In addition, global-ingress congestion is detected by applying a queue-length based flow control algorithm to the summation of the ingress flow queues contributing to the shared buffer-pool egress port through which the resource management cell passed. If global-ingress control is active then the resource management cell is marked based on the merged egress, global-ingress, local-ingress congestion marking values and the congestion marking values originally carried by the resource management cell. Otherwise the resource management cell is marked based on the merged egress, local-ingress congestion marking values and the congestion marking values originally carried by the resource management cell.
A dual flow control method for available bit rate service in a distributed ingress queueing switch architecture using resource management cells carrying original congestion marking values, said switch including a plurality of egress buffer-pools each having at least one egress subport, at least one shared buffer-pool feeding into said egress buffer-pools, and a plurality of ingress buffer-pools feeding into said shared buffer-pool, wherein each ingress buffer-pool has a flow queue corresponding to each egress buffer-pool and each shared buffer-pool has at least one egress port, said method comprising the steps of:
A dual flow control method for available bit rate service in a distributed ingress queueing switch architecture using resource management cells carrying original congestion marking values, said switch including a plurality of egress buffer-pools each having at least one egress subport, at least one shared buffer-pool feeding into said egress buffer-pools, and a plurality of ingress buffer-pools feeding into said shared buffer-pool, wherein each shared buffer-pool has at least one egress port, and wherein each ingress buffer-pool has a plurality of flow queues corresponding to each egress port of the shared buffer-pool, said method comprising the steps of:
Dependencies are inferred from the claim text.