International Journal of Wireless and Microwave Technologies (IJWMT)
IJWMT Vol. 3, No. 1, 1 Sep. 2013
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Novel Hybrid Spectrum Handoff for Cognitive Radio Networks
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Author(s)
Nisar A Lala
1,*
Moin Uddin
2
N A Sheikhc
3
Index Terms
Cognitive radio, spectrum handoff, proactive decision handoff, reactivedecision handoff, queueing theory
Abstract
Cognitive radio (CR) is projected as a technology (or solution) that will raise the spectrum utilization considerably by allowing low-priority or secondary user (SU) to utilize the spectrum of high-priority or primary user (PU) opportunistically. Spectrum handoff is a different type of handoff necessitated by the reappearance of the primary user on the frequency channels occupied by the secondary user at that time and location. In this paper, a hybrid type of spectrum handoff algorithm is proposed where proactive decision and reactive decision approaches are combined. Depending on the arrival rate of primary user (i.e. PU activity), the algorithm switches from reactive decision mode to proactive decision mode and vice versa. The switching from one mode to another mode depends on threshold value of PU activity and we evaluated the threshold value through analysis for switching of the algorithm to be 0.37. Simulated results show that the proposed hybrid spectrum handoff algorithm reduces the total service time of secondary user considerably compared to conventional proactive decision or reactive decision handoff approaches.
Cite This Paper
Nisar A. Lala, Moin Uddin, N A Sheikhc, "Novel Hybrid Spectrum Handoff for Cognitive Radio Networks", IJWMT, vol.3, no.1, pp.1-10, 2013. DOI: 10.5815/ijwmt.2013.01.01
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