Minimization of modem retransmissions
US5150368A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1990 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Apr 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/1803
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.