Fallback method to 1200 bits per second for use in mobile radio
US5450438A · kind A · utility
24Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Jul 26, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/188
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a mobile data communications system, a near-end modem initiates a data connection to a far-end modem at the highest permissible data rate, e.g., at 9600 bits per second (bps). If the communications channel subsequently degrades, either the near-end modem, or the far-end modem, initiates an autorate, or fallback sequence, e.g., to 4800 bps. However, if channel performance is still poor at 4800 bps, then one, or both, of the modems initiate a fallback to 1200 bps--skipping over the data rate of 2400 bps, which is not included within the fallback sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.