Method of controlling communications in a cellular radiotelephone system
US4984290A · kind A · utility
36Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W48/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cellular system employs a subaudible signalling control protocol. The protocol includes transmitting supervisory related signals between the radiotelephone and one of the cell sites at a first subaudible digital bit rate, and transmitting data messages between the radiotelephone and said one of the cell sites at a second subaudible digital bit rate. Additionally, the system employs specific protocols involving alert, hand-off and call disconnect which accommodate the subaudible signalling, yet provide significant integrity and reliability advantages over previously known protocols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.