Methods and apparatus for clear channel assessment
US9301150B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2014 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | May 29, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0816
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Systems and methods for determining primary channel availability are disclosed. One aspect is a method in a wireless communications system including a first primary channel having first and second frequency spectrum bandwidths. The second frequency spectrum bandwidth includes the first frequency spectrum bandwidth. The method includes determining whether a first preamble has been detected on the second primary channel during a first threshold period of time, determining whether a second preamble has been detected on the first primary channel during a second threshold period of time, determining whether a guard interval has been detected on the second primary channel during a third threshold period of time, determining whether the second primary channel is idle based at least in part on detection of the first preamble, the second preamble and the guard interval, and transmitting a wireless message based at least in part on whether the second primary channel is idle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.