Backpressure history mechanism in flow control

Details Backpressure history mechanism in flow control Backpressure history mechanism in flow control

2003-06-20

2008-03-11

Rao, Seema S. (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

Reexamination Certificate

active

07342881

ABSTRACT:
The backpressure flow control mechanism is widely used in telecommunications network. Actions of the flow control scheme are not instantaneous in that latency always exists between action and reaction, resulting in a flow control round trip time. This flow control round trip time causes ambiguity in determining the amount of traffic in transit. The invention monitors the amount of traffic which is on the way toward the queue during the past period of the round trip time, thus eliminating the ambiguity. A more precise control of traffic flow is possible, realizing reduction of storage space in the queue by one half. In one embodiment, the invention keeps a historical record of flow control signals sent back during the most recent flow control round trip time.

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Mark Handley et al, in IETF “TCP Friendly Rate Control (TFRC): Protocol Specification”, Draft 4, Apr. 27, 2002.

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