Method and apparatus for automatically adjusting the output power of a transmitter
US4918431A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Oct 31, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/288
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transceiver must pass through a predetermined area and receive two codes before relocating from a low power to a high power communication system (and vise versa). By determining in which order the two codes were received, the transceiver knows whether it has advanced from a low-to-high or high-to-low power communication system. Accordingly, the transceiver may adjust its transmitter power or other operational parameters to properly operate in both communication system. Also, the transceiver operates to approximate remaining battery life when it determines that it is moving from a low power to a high power mode. In this way, the transceiver may inform an operator of limited operational life in a high power mode, while the individual has an opportunity to obtain additional or a replacement battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.