TV white space devices using structured databases
US8755813B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2010 |
| Grant date | Jun 17, 2014 |
| Priority date | — |
| Expiry date | Jul 9, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W48/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A two-level database structure for use by unlicensed TVBD devices operating in TV white space comprises a central database and local databases. The central database comprises two sub-database: the central licensed database which maintains information about all licensed TV devices and the central unlicensed database which maintains information about unlicensed wireless devices operating in TV spectrum. The local database is created by each TVBD device or TVBD network when it initiates and it stores information related to all transmitters in the local area including location, power transmission levels, operating schedule, sensing results, backup channel information. The local databases communicate with central database to query it about licensed usage of TV spectrum and register with central database. The local databases communicate with each other to exchange information about channel usage, sensing results, transmission patterns and other information that will allow the local databases to negotiate coexistence without central coordinator. The locally implemented negotiation prevents the overloading of the central database.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.