Method for determining available frequencies in selective call receivers
US5740534A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Feb 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/022
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A selective call receiver (106) has a frequency synthesizer (708) for scanning a plurality of frequencies to determine a control channel to receive a signal and a receiver (704) for receiving the signal representative of an available frequency associated with a geographic region. The signal includes a channel identifier (404), a frequency assignment (406) and an active channel indicator (408). A processor (712) associates the channel identifier (404) with the frequency assignment (406) in response to the active channel indicator (408) indicating an available frequency of the geographic region and a memory (720) stores channel identifiers (404) associated with frequency assignments (406) designating available frequencies (408). The receiver (704) receives an address (333) and the channel identifier (404) on the control channel, a decoder (714) decodes the channel identifier (404) associated with the frequency assignment (406) to determine the available frequency where a message will be transmitted and the frequency synthesizer (708) switches to the available frequency indicated by the channel identifier (404) for receiving the message.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.