System Dwelling Times of Secondary Call in Cognitive Radio Systems

Jungchae SHIN
Yutae LEE
Ho-Shin CHO

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.7    pp.2170-2173
Publication Date: 2011/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2170
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
cognitive radio,  system dwelling time,  preemption,  spectrum handover,  preemptive priority queueing model,  

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In this paper, a preemptive priority queueing model is developed to derive the system dwelling time of secondary calls in a cognitive radio system in which a primary call's reoccupation of the channel is modeled as a preemptive event that forces a secondary call to attempt a spectrum handover. The suspension of secondary call service which may happen when the immediate spectrum handover fails, is included in our computation of the system dwelling time. The results are helpful in evaluating cognitive radio systems in terms of service delay and in determining system design parameters such as required buffer size and system capacity.