Method for synchronizing frequency-hopping short-range radio devices
US7961091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2007 |
| Grant date | Jun 14, 2011 |
| Priority date | — |
| Expiry date | May 2, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7143
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for synchronizing a security system control panel and a sensor. The control panel and the sensor each have a transceiver. The control panel monitors a publicly broadcast signal for an time signal, periodically receives the time signal, calculates a frequency hopping index pointer using the time signal and accesses a frequency hopping table using the frequency hopping index pointer. The frequency hopping table is used by the control panel to determine when to hop between multiple receiving channels and which of the receiving channels to hop. The sensor wakes up from a standby mode when the sensor determines that the sensor is to send data, receives the publicly broadcast signal that includes a time signal, selects the channel that the control panel is actively receiving data using the time signal and transmits the data to the control panel using the selected channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.