Apparatus and method for calibration of sleep mode clock in wireless communications mobile station
US5995820A · kind A · utility
33Cited by
8References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jun 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention presents a calibrator for a mobile station of a TDMA wireless communications system such that the calibrator calibrates a low-frequency clock to a high frequency clock locked to system timing. When the mobile station is in idle mode (i.e., listening to a paging channel periodically, but otherwise taking no action), the control processor commands the mobile station to enter into sleep mode to minimize power consumption. During sleep mode, the high-frequency reference clock and all clocks derived from it are turned off. Only the calibrated low-frequency clock remains operating to clock the sleep logic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.