Abstract
Cognitive radio is an innovative technology in the field of wireless communication systems, aimed at significantly improving the use of the radio spectrum while allowing secondary users to access the spectral band opportunistically. Spectrum management mechanism ensures the transmission of data by controlling the efficiency of operation between the primary and secondary networks. The main task of spectrum management is to ensure that secondary users benefit from the spectrum without interfering with primary users. This paper deals with some of the important characteristics of spectrum mobility in the cognitive radio networks. The new management approaches of the mobility and the connection are designed to reduce the latency and loss of information during spectrum handoff, a list of channel safeguard is maintained in this effect, but the maintenance and update are a challenge. In this paper, we describe the reasons and mechanisms of spectrum handoff. Protocols have been developed to illustrate this handoff mechanism. We also make a comparison between the different methods of spectrum handoff. The simulation results obtained confirm that the protocols developed and the proposed method performed better than the pure reactive handoff method.
Highlights
Since some tens of years, the field of wireless telecommunications tends to take a more and more important in the current companies, both in economic terms and in terms of technological advances
Journal of Electrical and Computer Engineering e mobility aspect is very important in cognitive radio networks (CRNs), and it takes into account various requirements: (1) to adapt the mechanisms of anticipation of the handoff to the context of the CR and (2) to propose specific solutions to this new type of networks. e change of the operating frequency band of the secondary users (SUs) is a task related to the management of the spectrum mobility which makes it possible to guarantee the continuity of transmission of SU without interruption
In [20], the authors examined and introduced the criteria for proactive spectrum handoff (SH) in the common jump coordination scheme in a multiuser CRN. ey associated this scheme with another distributed channel selection scheme. ese two schemes work together to improve the performance of the SH mechanism. e points related to the probability of inactivity of primary users (PU) on the channel were not suggested, and the conditions relating to the waiting time of SU was not so mentioned
Summary
Since some tens of years, the field of wireless telecommunications tends to take a more and more important in the current companies, both in economic terms and in terms of technological advances. E change of the operating frequency band of the SUs is a task related to the management of the spectrum mobility which makes it possible to guarantee the continuity of transmission of SU without interruption. Concerning the proactive handoff technique, PU activities are periodically detected by SUs before deciding whether to handoff the data to the idle channel. Most of the research works on the CR have concentrated primarily on the spectrum detection and the dynamic allocation of frequencies between users without taking into account the mobility and of the handoff. Reducing unnecessary and multiple handoffs of SUs improves the communication system stability of cognitive users For this purpose, protocols have been initiated to promote the smooth operation of the proposed scheme.
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