Cognitive control radio access information via database or cognitive pilot channel

摘要

In an exemplary embodiment a cognitive radio/user equipment CR/UE receives information of where at least one cognitive control radio channel resides from at least one of the following sources: a database sharing information on licensed spectrum users, and a cognitive pilot channel CPC sharing information on licensed spectrum users. The CR/UE uses the received information to access the at least one CPC. In more specific exemplary embodiments: the information of where the at least one cognitive control radio channel resides comprises the used frequency for the at least one cognitive control radio channel; in response to at least one of expiration of a periodic timer, discovery of interference from a primary user on a channel, and entering a new geographic area, the database or CPC is checked or re-checked to detect from the received information that the used frequency for the CRC channel has changed.