Monitoring and alarm circuitry for a base station transmitting supervising signals to one or more mobile radio stations
US5423071A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1992 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Jul 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2621
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A base station is provided which supervises the quality of a radio link and including a generator circuit for generating a supervising signal having a desired baseband frequency, a measuring circuit for monitoring the level of the baseband supervising signal, and a transmitting circuit for frequency-modulating a transmitting-frequency carrier of said baseband supervising signal. The measuring circuit comprises an A/D converter for deriving digital sample values from the baseband supervising signal, and a control circuit which monitors the deviation of sample values from that of a digital sample value corresponding to a supervising signal level causing a desired deviation in the output signal of the transmitting circuit on the basis of at least one reference value stored in a memory in connection with the calibration so that the deviation is no more than a predetermined difference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.