Radio system to allow for exchanging messages between a set of stations
US4995097A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1988 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Dec 21, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W48/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio system allows for exchanging messages between a set of relay stations (R1, R2, R3 . . . ) and mobile access stations (M . . . ) for communications. At least one common semaphore channel is used through which the relay stations simultaneously transmit code signals (M(R1)+M(R2)+M(R3)+. . . ) at first preset instants and separately transmit a code signal at other preset time instants, the access stations tap the said channel at these various preset instants and the recognition in the access station of code signals received in the first preset instants and the quality of code signals received in the other preset instants constitutes a criterion for establishing the connection between the access station and a relay station corresponding to the recognized code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.