Modeling and Analysis for Proactive Spectrum Handoff in Cognitive Radio Adhoc Networks with Improved Throughput and Security

Vignesh Balaiah

Abstract


Today’s wireless networks is characterized by a fixed spectrum assignment policy. Though, major parts of the assigned spectrum are used sporadically and geographical variations in the utilization of assigned spectrum ranges from 15% to 85% With a high variance in time. A Cognitive radio is a transceiver also concurrently changes its transmission parameters so more number of wireless communication may run concurrently in a given spectrum band at  a place. This is also known as dynamic spectrum management. The spectrum is utilized by the licensed users however unlicensed users are temporary visitors to the spectrum, channel is allocated when spectrum is not used by the licensed users. But due to the randomness of the licensed users the spectrum disruptions to both licensed and unlicensed users occurs which may lead to the low throughput and high delay. The limited available spectrum and the inefficiency in the spectrum usage necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. In order to avoid the channel disruptions we implement channel switching polices and a proactive spectrum handoff protocol to let unlicensed users vacate the channel before the licensed user arrives. This will eliminate the collisions among users and secondary users coordinate with each other without common control channel. We compare the effectiveness of our proactive spectrum handoff protocol and reactive spectrum handoff protocol.


Keywords


Cognitive radio network, spectrum handoff policy, network coordination, channel selection Scheme.

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