Cellular telephone signalling circuit operable with different cellular telephone systems
US5396653A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1992 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Jun 5, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Apparatus operable with different cellular telephone systems and signalling protocols is described. Signalling messages, both data messages and supervisory related signals between a cellular telephone microcontroller (4) and a base station are transferred via a baseband signalling circuit (10). The baseband signalling circuit is operable to employ different signalling protocols, the protocol being selected by control bits provided from the microcontroller to the signalling circuit. In a preferred embodiment, the signalling protocol selection is made between an AMPS/TACS signalling protocol and a NAMPS/NTACS subaudible signalling protocol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.