Multiplex communications – Data flow congestion prevention or control – Flow control of data transmission through a network
Patent
1996-05-29
1998-07-28
Hsu, Alpus H.
Multiplex communications
Data flow congestion prevention or control
Flow control of data transmission through a network
370396, 370412, H04L 1256
Patent
active
057870730
ABSTRACT:
In an asynchronous transfer mode switched network, a source terminal sends a burst of data cells and a control cell at periodic intervals through network nodes to a destination terminal. Each network node includes a first buffer and a second buffer, and incoming data cells are stored into the first buffer and incoming control cells are stored into the second buffer. A transmit controller is connected to the first and second buffers for forwarding cells in the first and second buffers in a downstream direction with priority given to the control cells in the second buffer over the data cells in the first buffer. A congestion detector is connected to the first buffer for writing a congestion indication into a control cell which is either stored in or forwarded from the second buffer when the first buffer is filled to a predetermined storage level. The destination terminal copies the congestion indication on receiving a control cell from the network and returns a control cell that contains the copied congestion indication toward the source terminal. On receiving a control cell containing the copied congestion indication, the source terminal reduces the data cell transmission rate.
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Hsu Alpus H.
NEC Corporation
Yao Kwang B.
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