Mixed spectrum handoff algorithm for cognitive radio based on channel state prediction
Shaoqian Li · Computer Engineering and Applications Journal · 2012
A mixed spectrum handoff algorithm which combines reactive spectrum handoff and proactive spectrum handoff is proposed in Cognitive Radio Networks(CRNs).Based on the continuous-time markov chain of Primary Users'(PUs')channels,the algorithm predicts the future channel state and performs proactive spectrum handoff for serving Secondary Users(SUs).Meanwhile,the algorithm performs reactive spectrum handoff for collision SUs.Simulation results show that compared with the reactive spectrum handoff algorithm,the proposed algorithm can dramatically reduce the number of collisions between SUs and PUs on the premise of unchanged SU's blocking probability and outage probability.Moreover,the spectrum efficiency of the CRN can be increased in the proposed algorithm.