Local area network having a wireless transmission link
US5369639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1990 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Dec 24, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0825
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A local area network station (12) includes a transceiver (20) adapted to transmit and receive signals over a wireless communications link. The transceiver (20) is coupled to a CSMA/CD LAN controller device (22) and to a signal generator circuit (40) which is also coupled to the LAN controller device (22). If the station (12) desires to transmit a data frame but a carrier sense signal (CRS) indicates that the link is busy, transmission of the data frame is deferred, and after the carrier sense signal (CRS) becomes inactive, a collision is simulated by the signal generator circuit (40) providing a CDT signal to the LAN controller device (22) which goes into a backoff mode and attempts to retransmit the frame after a random backoff time. Thus, commercially available CSMA/CD chips can be utilized in a single wireless channel LAN environment using a CSMA/CA protocol, with a low risk of collisions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.