Time base alignment for digital mobile phones
US6219564A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1999 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | May 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/56
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a digital mobile telecommunications station having a high frequency timebase circuit which can by synchronized with a base station timebase, the high frequency timebase circuit is shut down for a predetermined period for power saving purposes. Following completion of the shut down period, the timebase circuit is re-synchronized. A first counter counts cycles of a relatively low frequency clock while a second counter counts cycles of a high frequency clock forming part of the timebase circuit. A first storage stores the count in the second counter at a first specified point in timebase cycle during shutdown while a second storage stores the count in the second counter at a second specified point in a timebase cycle following completion of the shut down. A timebase corrector corrects the timebase after such completion on the basis of the number of cycles of the low frequency clock which shut down persisted, the number stored in the first and second storages and data identifying the first and second points in the timebase cycles referred to.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.