Spectrum Handoff Technology in Cognitive Radio
Qun Wang · 2013
Spectrum handoff is a key technology in cognitive radio,and when the primary user appears at the licensed spectrum,the cognitive user must quickly vacate the spectrum,move to a new idle spectrum and resume the unfinished transmission,thus to ensure the service quality while guaranteeing the normal communication of the primary user.This would improve the overall spectrum utilization of the system.This paper gives the concept of spectrum handoff,compares two major types of spectrum handoff strategies,that is proactive spectrum handoff strategy and reactive spectrum handoff strategy.Finally this paper summarizes the related target channel selection algorithms,and points out the future work on this topic.