Data transmission device for random access network, with improved collision resolution, and corresponding method
US5517501A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/413
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A data processing station wherein a network interface monitors the transmission channel and generates event signals, e.g. "transmission start" "collision detected" and "channel back to vacant condition". If a collision occurs in local transmission, transmission is maintained with a collision indication for at least one period before being cut off. An observation register receives the event signals and responds by generating a channel observation signal which may be "transmission OK" "collision slot" and "vacant slot". When transmission of a fresh data packet is requested, a first transmission may or may not be attempted (normal mode) depending on the condition of the observation register. If the attempt is unsuccessful (transmission refused or collision), a suitably reset mechanism for incrementing/decrementing a common integer determines the right to transmit, so that the response to a request for the transmission of a fresh data packet is made regardless of the channel's operating record, upstream from the last normal mode to be executed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.