Multi-mode radio telephone with velocity sensing mode selection
US6421538B1 · kind B1 · utility
142Cited by
1References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/045
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio telephone (200) is operable in a cordless telephone system or in a cellular telephone system. The telephone (200) incorporates circuitry to detect user velocity so that when the user travels more quickly the telephone automatically transfers from cordless mode, which is the preferred mode, to cellular mode. This prevents the degeneration in communication quality which frequently occurs when a user of a cordless system travels faster than walking pace.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.