Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Patent
1997-03-07
2000-07-25
Hsu, Alpus H.
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
370249, 370252, H04L 1226, H04L 1256
Patent
active
060944188
ABSTRACT:
Specific ABR control capability for implementing an ABR service in an ATM switching system. A subscriber line processing device has a capability for calculating a turnaround delay time of a cell, based on a period during which the cell loops back at a terminal and returns. A switch or demultiplexer has a capability for detecting congestion. A rate calculator calculates a transmission rate corresponding to an output channel, and writes the calculated rate to the cell. A rate changer suitably changes the transmission rate according to the degree of occurrence of congestion. Additionally, the rate changer counts the number of communicating connections. At this time, the number of communicating connections which should exist in a certain predetermined period is estimated based on the counted number of communicating connections, which is counted in a period shorter than the predetermined period according to a predetermined method. Additionally, a coefficient is determined based on the number of communicating connections so estimated and an actual number of communicating connections, and a next estimated value is estimated to be a more suitable value using the coefficient.
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Kawarai Kenichi
Kawasaki Takeshi
Kusayanagi Michio
Nakamichi Koji
Soumiya Toshio
Fujitsu Limited
Hsu Alpus H.
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