Method and apparatus for transmission of telephone calls to a portable, wireless telephone set
US4628152A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1983 |
| Grant date | Dec 9, 1986 |
| Priority date | — |
| Expiry date | Aug 11, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/733
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and an equipment for wireless transmission of telephone calls between a stationary unit (1) connected to a telephone set (3) at a short distance from the stationary unit provides that all pairs of units (1, 3) have access to a plurality of common duplex radio speech channels for transmission of calls, and to a common radio signalling channel for transmission of signals referring to connection and disconnection of the speech channels. The radio speech channels are assigned after adaptive channel scanning in that they are listened to before a call, and a channel selected which is idle with respect to calls. The selection of an idle channel takes place automatically with the use of radio receivers (12, 25), channel selectors (15, 28) and circuits (16, 29) incorporated in both units.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.