Method and system for restarting a reference clock of a mobile station after a sleep period with a zero mean time error
US6725067B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2000 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Mar 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is a method and system to minimize the timing errors introduced by the use of a sleep clock, utilized in timing a sleep period, for a mobile station. Further, the present invention restarts a high frequency reference clock after the sleep period with a zero mean time error to ensure that the receiver of the mobile station is properly synchronized with a base station for the receipt of pages. A low frequency sleep clock is calibrated with respect to a high frequency reference clock during a pre-defined calibration period. Based upon the calibration, a calibration error for the sleep clock is determined. Next, a wake-up time error is calculated, based upon the calibration error, to compensate for the error of the sleep clock. The wake-up time error compensates for the error of the sleep clock during the sleep period such that the reference clock restarts at the end of the sleep period with a zero mean time error. This ensures that the reference clock and the receiver of the mobile station will be properly time synchronized with the base station for the receipt of pages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.