Cognitive system cell spectrum allocation method, device and system

The invention relates to a radio communication technique, in particular to a cognitive system cell spectrum allocation method, and provides a cognitive system cell spectrum allocation method, a device and a system, which are used to enhance the stability of a cognitive system. The spectrum allocation technique provided by the embodiment of the invention takes the reliability of spectrum into full consideration, enhances the stability of the cognitive system and gives consideration to reliability and continuity at the same time during spectrum allocation, consequently, the system can reliably use spectrum, the frequency-switching frequency of the cognitive system is effectively reduced, meanwhile, the continuity of the allocated spectrum is ensured as much as possible, the increase of system overhead is avoided, and the spectrum-utilizing rate is increased.