Minimization of modem retransmissions

Details Minimization of modem retransmissions Minimization of modem retransmissions

1990-04-10

1992-09-22

Atkinson, Charles E.

Excavating

371 51, 371 32, H04L 118, G06F 1100

Patent

active

051503689

ABSTRACT:
Method and apparatus for minimizing retransmissions during communication in a modem-to-modem communications system. The inventive method includes the steps of: (a) receiving a data packet and determining a checksum; (b) comparing the checksum with a checksum embedded in the data packet; (c) if the checksums are the same, transmitting a signal which indicates that the data packet was received correctly and returning to step (a); (d) if the checksums are different, incrementing a counter; (e) checking the counter, if the counter is less than a predetermined threshold, saving the data packet with its embedded checksum, transmitting a signal which indicates that the data packet was not received correctly and returning to step (a); (f) otherwise, bit averaging the newly received data packet with previously received and stored data packets, including the embedded checksums, and determining a checksum for the bit averaged data packet; (g) if the bit averaged, embedded checksum matches the determined checksum for the bit averaged data packet, transmitting an "OK" signal and returning to step (a); and (h) if the bit averaged, embedded checksum does not match the determined checksum for the bit averaged data packet, saving the newly received data packet with its embedded checksum, transmitting a signal which indicates that the data packet was not received correctly and returning to step (a).

REFERENCES:
patent: 3824547 (1974-07-01), Green et al.
patent: 4430736 (1984-02-01), Scholz
patent: 4763293 (1988-08-01), Takei et al.
patent: 4803684 (1989-02-01), Kozuki et al.
patent: 4885749 (1989-12-01), Golden
patent: 4887162 (1989-12-01), Arai
patent: 4907277 (1990-03-01), Callens et al.
patent: 4943964 (1990-07-01), Hatanaka et al.

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