Method and apparatus for location determination of a cellular telephone
US6438381B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2000 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jun 8, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/3805
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of making a geographic location determination via a cellular telephone in signal communication with a base station. The mobile station first attempts to detect a position location signal. Upon determining that the position location signal is insufficient to use in a position location calculation, the mobile station deactivates at least a portion of a receiver. The mobile station receives a cellular communication signal and measures a signal quality of the cellular communication signal. Responsive to the signal quality improving by a predetermined amount, the mobile station reactivates the receiver portion and re-attempts to detect the position location signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.