Er information acceleration in abr traffic

Details Er information acceleration in abr traffic Er information acceleration in abr traffic

H - Electricity

04

L

H04L 12/24 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2238795

There is provided a method and a network element for feedback control of a rate of message transmission over a connection in a communications network. The source of message transmission is provided with instructions for setting a rate at which it will transmit messages. The instructions are transported by feedback messages received by the source. The received feedback messages contain an explicit rate of transmission which is the lowest of the explicit rates of transmission corresponding to those determined from states of congestion associated with each of the network elements along the connection. The method includes the step of receiving feedback messages from a backward message path at the network element. The explicit rate of transmission carried by each received feedback message is extracted and stored so that the rate pertaining to a last received feedback message is replaced by that pertaining to a currently received feedback message. The received feedback messages are then stored in a first-in first-out order. Each stored feedback message is retrieved in a first-in first-out order and, when so retrieved, is marked with an explicit rate of transmission. The marked rate of transmission is determined as a function of the stored rate and a rate determined from a state of congestion associated with a contention point of the network element. The retrieved feedback message, once so marked, is transmitted from the network switch over the backward message path.

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