ATM NETWORK CONGESTION CONTROL SYSTEM USING EXPLICIT RATE CELL MARKING

摘要

An explicit rate algorithm for use in an end-to-end closed-loop flow control algorithm for ATM networks transmitting at least fixed bit rate (CBR) traffic, variable bit rate (VBR) traffic, and adjustable bit rate (ABR) . The algorithm determines the amount of bandwidth available for ABR traffic on the output link from the node and generates an explicit rate variable that can be sent to the source for ABR traffic. And determines the maximum and minimum bandwidths already reserved for all connections on the output link. A value of one reserved bandwidth is selected within a range defined by the values of the maximum and minimum reserved bandwidths. The current utilization of the ABR input buffer for the node is also determined. The explicit rate variable is generated as a function of the link capacity, the value of the reserved bandwidth, and the current utilization of the ABR input buffer. The explicit rate variable is recorded in the resource management cell to be delivered to the ABR traffic source through the network. The explicit rate variable is intended to change the input rate of the ABR source to make more use of the ABR input buffer.