Method of managing the transmission of messages from a set of transmitters to a single receiver on a single channel
US5774459A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/413
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods that enable the simple management of the unilateral exchanges of messages between a highly simplified set of transmitters and a single receiver, this transmission being done on a single channel. It consists in providing for the transmission, by the receiver (100), of the simplest possible binary signal indicating that the channel is busy as soon as a message from one of the transmitters is detected. Reception of said signal by the other transmitters (102-104) prevents them from transmitting. Risks of collision between messages from different transmitters are handled by a set of test (Tt) and standby (Tv, Ta, Tl) periods. The busy signal may be a simple modulated carrier in the case, for example, of microwave transmission. It provides for the efficient management of badge-based systems such as access control systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.