Study of spectrum handover based on grading in cognitive radio systems
Changbiao Xu · Computer Engineering and Applications Journal · 2011
In order to improve the link maintenance probability and spectral efficiency while decreasing delay during spectrum handover in cognitive radio systems,two models based on the diversity of spectrum quality and the requirements of secondary services are constructed for the cognitive user,when they want to use the currently available frequency resources, and factors such as the probability of primary user appears,channel selection and conflict avoiding algorithms are also taken into consideration.Finally,an efficient mechanism based on grading is presented.Numerical results show that the propositional mechanisms can implement discriminative operation to kinds of secondary services and guarantee the QoS of primary user and secondary user.