Methods and apparatus for clear channel assessment
US8923118B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2011 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Dec 16, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a communication system that utilizes at least a primary channel, a secondary channel, and a tertiary channel, a primary channel signal level in the primary channel is measured, and a secondary channel signal level in the secondary channel is measured. A first tertiary channel signal level in a first bandwidth portion of the tertiary channel is measured, and a second tertiary channel signal level in a second bandwidth portion of the tertiary channel is measured. It is determined whether the primary channel is idle based on the primary channel signal level, and it is determined whether the secondary channel is idle based on the secondary channel signal level. It is determined whether the tertiary channel is idle based on the first tertiary channel signal level and the second tertiary channel signal level. It is determined whether a valid signal is received via a first composite channel including the primary channel, the secondary channel, and the tertiary channel. A first composite channel signal level in the first composite channel is measured at least when it is determined that a valid signal was received via the first composite channel. It is determined whether the first compos…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.