Method and apparatus for allowing communication units to utilize non-licensed title spectrum
US7239624B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Mar 22, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/42
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The presence of the non-television transmission within a channel is used to indicate that secondary non-licensed usage of the channel is permitted. Specifically, if secondary users incorporate the means to identify the unique modulation signature of the secondary user, decoding of a beacon signal may not be necessary. With the above in mind, a radio will be prevented from transmitting within a frequency band when no transmission within the licensed spectrum is currently taking place; the licensee is currently transmitting on the spectrum (e.g., television transmissions are taking place utilizing the spectrum, or the radio cannot sense the presence of a data channel (beacon).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.