This thesis first introduces the cognitive radio concepts, the research status on cognitive radio techniques. The characteristics of cognitive radio and possible issue to confront are analyzed and concluded in follow. We give the definition of the spectrum handoff include its class and flow based on the presentation of the research of handoff management in the next-generation. And then new wedding dresses existing spectrum handoff algorithms and protocols are generally also analyzed so as to specify the focus in this thesis.Focusing on the two aspects: 1, cognitive radio cheap evening dresses system has a high handoff rate because of the spectrum dynamic; 2, call drop rate of cognitive radio system is increased on peak of primary users. The spectrum handoff algorithms and protocols discount wedding gowns which adapt them well to the cognitive radio environment are proposed. Chapter 3 proposes a spectrum allocation algorithm which enables each cognitive user to distributive cheap shoes blog 2010 choose the custom made prom dresses best channel to optimize the performance of handoff by minimizing handoff rate and handoff latency. Chapter 4 designs a handoff retrieval protocol which saves the call drop based on the Hierarchical Spectrum Sharing Network, theory and simulation results all show that this protocol can reduce the call drop rate on a big scale.
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