Abstract
Cognitive radio has developed as a new technology that uses unutilized spectrum holes in an opportunistic manner. Fixed spectrum allocations have caused to reveal unused portions of radio frequencies in spectrum channels. Cognitive radio technology aims to take advantage of unutilized or vacant portions of the spectrum by allowing secondary users to sense the spectrum. Spectrum management is a technique that controls interaction between primary (licensed) and secondary (unlicensed) users. It is very important for performance of cognitive radio networks that secondary users must not cause any interference to the primary users. In case of reallocating the frequency channels that has reallocated to secondary users before, it is required for secondary users to access a new frequency channel. This process is described as spectrum handoff. In this work, the process of channel handoff event for secondary users, known as spectrum handoff, in cognitive radio networks are investigated.
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