Method for controlling data traffic in an ATM network
First Claim
1. A method of controlling data traffic in an ATM network including plural nodes connected via a closed loop, each node being equipped with a number of access ports for sending and receiving ATM cells, the method comprising the steps of:
- a) in each node, processing ATM cells of different QoS classification separately based on stipulated QoS classification;
b) for each access port, establishing a separate queue for each classification of QoS;
c) in each node, monitoring the data traffic in the closed loop by means of a cell monitor separately for each classification of QoS; and
d) in each node, generating back-pressure signals for one or more of queues of the node in order to suppress an insert data stream if a performance characteristic of a QoS classification is not fulfilled.
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Abstract
For controlling the data traffic in an ATM network, in which a number of nodes are connected via a closed loop, and in which each node may be equipped with a number of access ports for sending and receiving ATM cells, the ATM cells are processed separately in each node based upon their assignment to a QoS (quality of service) class in a predefined QoS classification. In each access port, each QoS class is assigned a separate queue. The data traffic in the closed loop is monitored separately, based upon QoS class, by a cell monitor. If a performance characteristic of a QoS class is not fulfilled in the closed loop, then at least one back-pressure signal will be generated, which will serve to suppress at least one assigned queue of the access port. The monitoring of the data traffic can be implemented via a leaky-bucket system.
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Citations
10 Claims
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1. A method of controlling data traffic in an ATM network including plural nodes connected via a closed loop, each node being equipped with a number of access ports for sending and receiving ATM cells, the method comprising the steps of:
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a) in each node, processing ATM cells of different QoS classification separately based on stipulated QoS classification; b) for each access port, establishing a separate queue for each classification of QoS; c) in each node, monitoring the data traffic in the closed loop by means of a cell monitor separately for each classification of QoS; and d) in each node, generating back-pressure signals for one or more of queues of the node in order to suppress an insert data stream if a performance characteristic of a QoS classification is not fulfilled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A node configuration for an ATM network, comprising:
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a demultiplexer/multiplexer for extracting and inserting ATM cells out of and into the ATM network; at least one access port having several queues for the intermediate storage of ATM cells to be transmitted, wherein ATM cells to be inserted belong to QoS classes and are separated based upon corresponding QoS class; at least one cell monitor for monitoring a data stream on the ATM network; and a back-pressure generator for generating a back-pressure signal, based upon the monitored data stream and specifically for one or several queues, for suppressing insertion of ATM cells into the ATM network. - View Dependent Claims (10)
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Specification