Credit-based receiver using selected transmit rates and...

Details Credit-based receiver using selected transmit rates and... Credit-based receiver using selected transmit rates and...

2006-07-04

2006-07-04

Vu, Huy D. (Department: 2663)

Multiplex communications

Data flow congestion prevention or control

Flow control of data transmission through a network

C370S468000

Reexamination Certificate

active

07072299

ABSTRACT:
A receiver may be adapted to prevent overflow or underflow of its data storage by generating a transmit rate value as a feedback to the sender. Speed adjustments are performed periodically with a fixed time period denoted by Dt. Transmission rates are explicitly 0, Max/2, and Max. The receiver queue is itself drained at a rate R that at any time satisfies 0<=R<=Max. The level of occupancy of the receiver storage queue is denoted by Q. The maximum capacity of the receiving queue is designated Qmax, so at any time, 0<=Q<=Qmax. Two thresholds T1and T2(with 0<T1<T2<Qmax) of levels of the receiver queue value Q are determined. A transmit rate is then determined by the level of the receiver queue Q compared to the thresholds. The transmit rate feedback value achieves the desired goal of avoiding overflow and, once the value of Q has been positive at least once, avoiding underflow.

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“Fibre Channel Tutorials and Resources”, http://www.tol.unh.edu/training/fc/fc—tutorial.html#Flow—Control, May 4, 1998.

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