Pipelined, sliding-window, flow control for end-to-end communica

Details Pipelined, sliding-window, flow control for end-to-end communica Pipelined, sliding-window, flow control for end-to-end communica

1994-10-11

1997-01-07

Geckil, Mehmet B.

Boots, shoes, and leggings

39520012, 395849, 364DIG1, 36424296, 36423222, G06F 1300

Patent

active

055926274

ABSTRACT:
The present invention is directed to a method of, and apparatus for, improving the efficiency of transferring data between a transmitting unit and a receiving unit in an end-to-end layer of a network which does not support full duplexed communication at the end-to-end layers. The method comprises the steps of determining a window size N, where N represents the number of frames which can be received by the receiving unit. The transmitting unit: sets a current window size equal to 2N minus one; accepting a frame of data for transmission; decrements the current window size; transmits the data if the current window size does not equal zero or, if the current window size equals zero, waits to receive a message from the receiving unit before transmitting the data; resets the current window size to the current window size plus N upon receipt of the message: and returns to the accepting data step if all data has not been sent. The receiving unit: sets a current window size equal to N; receives a frame of data from the network; decrements the current window size; sends the message to the transmitting unit and resets the current window size equal to N if the current window size equals zero; transfers the received data; and returns to the receiving data step if there is more data to be received.

REFERENCES:
patent: 5517622 (1996-05-01), Ivanoff et al.
patent: 5528595 (1996-06-01), Walsh et al.
Behl et al, "Advanced SNA/IP; A Simple SNA Transport Protocol", Network Working Group, RFC 1538, Oct., 1993, pp. 1-10.
Prue et al, "Something a Host Could Do with Source Quench: The Source Quench Introduced Delay (SQUID)", Network Working Group, RFC 1016, Jul. 1987, pp. 1-18.
Throop et al, "SNMP MIB Extensions for X.25 LAPB", Network Working Group, RFC 1381, Nov. 1992, pp. 1-33.
Chapter 4: The Data Link Layer, pp. 148-164, 1981.
VTAM Network Implementation Guide, pp. 179-218, Mar. 1992.
SNA Transaction Programmer's Reference Manual for LU Type 6.2, pp. 2-3 through 2-8, B-9 through B-12 and B-19 through B-22, Sep. 1990.
Chapter 1: Introduction, pp. 10-27. Chapter 8: The Transport And Session Layers, pp. 376-381. Chapter 9: The Presentation Layer, pp. 432-435, 1981.

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