Dual site supervision for a control channel cellular radio used in a fire alarm reporting system
US7177639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Jan 30, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Dual site supervision is provided for a control channel cellular radio for a fire alarm reporting system that uses logic that causes a control channel cellular transceiver to operate in a nonstandard manner and to use a different and second cellular base station or site that the unit would not normally select operating pursuant to a standard cell phone software module. The logic causes the control channel cellular transceiver to monitor and test through more than one cell base station or site, thereby meeting the dual communication path supervision requirement for UL listed communications systems for stand alone fire alarm reporting systems. The available cellular control channels are first scanned, and the signal strength of each cellular control channel is measured. Then the cellular control channel with the strongest signal strength and the cellular control channel with the second strongest signal strength which are verified as being available for the assigned carrier are selected to report the status of the fire alarm system. A cellular radio message on the status of the fire alarm system is transmitted over the cellular control channel with the strongest signal strength, or if…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.