ATM exchange performing traffic flow control

Details ATM exchange performing traffic flow control ATM exchange performing traffic flow control

1997-05-15

1999-06-22

Jung, Min

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

370244, H04L 1256

Patent

active

059149361

ABSTRACT:
An ATM exchange for performing the flow control adaptively in accordance with the seriousness of congestion, provided with a first threshold comparing circuit and a second threshold comparing circuit for comparing a cell queue length in a buffer of the exchange with a first and a second threshold, a timer counter which starts counting when the queue length exceeds the first threshold and is cleared to zero when the the queue length becomes smaller than the second threshold, a permissible time comparing circuit for comparing the count value with a permissible time, and a congestion counter for counting the output of the comparing circuit. The ATM exchange sets the first threshold, second threshold, and permissible time from the number of multiplexings of standard traffic, mean cell rate, peak cell rate, mean survival time of burst length, and false alarm probability, and judges that the heavy congestion is occurring when the queue length does not return to the second threshold or lower within the permissible time, and controls the flow of traffic, and at the same time, when this state continues, the flow restriction is enhanced depending on the elapsed time from the permissible time.

REFERENCES:
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patent: 5457687 (1995-10-01), Newman
patent: 5737313 (1998-04-01), Kolarov et al.
The Rate-Based Flow Control Framework for the Available Bit Rate ATM Service, IEEE Network, pp. 25-39 Mar./Apr. 1995, F. Bonomi and F.W. Fendick (see Specification p. 1).
The Institute of Electronics, Information and Communication Engineers Technical Report: The Society for Switching System, SSE 93-30 (1993-7), Natoshi Watanabe et al. (pp. 25-30).
ITU-T Recommendation 1.371 (pp. 1-90).
A Cell Loss Approximation Method Applicable for ATM Traffic of which Burst Lengths Are Subject to General Distribution: The Institute of Information Processing Article Record, vol. 36, No. 10, Oct. 1995, Hatono et al. (see Specification pp. 12-13).
Continuation, Probability Process Theory for Physical Engineering-Corona Company, pp.120-123, Hisano Ogura (see Specification p. 18).
In-Service Monitoring for Cell Loss Quality of Service Violations in ATM Networks, IEEE/ACM Transactions on Networking, vol. 4, No. 2, Apr. 1996 (pp. 240-248).

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