Durowoju, Olasunkanmi, Arshad, Kamran and Moessner, Klaus (2011) Distributed power control algorithm for cognitive radios with primary protection via spectrum sensing under user mobility. Ad Hoc Networks, 10 (5). pp. 740-751. ISSN 1570-8705 (doi:10.1016/j.adhoc.2011.02.005)

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Abstract

Substantial spectrum gains have been demonstrated with the introduction of cognitive radio however; such gains are usually short lived due to the increased level of interference to licensed users of the spectrum. The interference management problem is herein tackled from the transmitter power control perspective so that transmissions by cognitive radio network does not violate the interference threshold levels at the primary users as well as maintain the QoS requirements of cognitive radio users. We model the cognitive radio network for mobile and immobile users and propose algorithms exploiting primary radio environment knowledge (spectrum use), called power control with primary protection via spectrum sensing. The algorithm is briefly introduced for time invariant systems and demonstrated that it has the ability to satisfy tight QoS constraints for cognitive radios as well as meet the interference constraints for licensed users. We, however, further show that such assumption of terminal immobility in the power control algorithm would fail in cases where user mobility is considered, resulting in increased levels of interference to the primary as well as increased outages in cognitive radio network. We model the link gain evolution process as a distance dependent shadow fading process and scale-up the target signal to interference ratio to cope with user mobility. Since mobility driven power control algorithms for cognitive radios have not been investigated before, we therefore, propose a mobility driven power control framework for cognitive radios based on spectrum sensing, which ensures that the interference limit at the primary receiver is unperturbed at all times, while concurrently maintaining the QoS within the cognitive radio network as compared to static user cases. We also corroborate our algorithms with proof of convergence.

Item Type:	Article
Additional Information:	[1] Available online: 4 March 2011. [2] Published in Ad Hoc Networks, Volume 10, Issue 5, July 2012 - Special Issue on Cognitive Radio Ad Hoc Networks. [3] The research leading to these results was derived from the European Community’s Seventh Framework Programme (FP7) under Grant Agreement number 248454 [Quality of service and mobility driven cognitive radio systems (QoSMOS)].
Uncontrolled Keywords:	transmit power control, spectrum sensing, mobility cognitive radios
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Pre-2014 Departments:	School of Engineering
Related URLs:	Publisher Organisation Organisation Organisation
Last Modified:	25 Sep 2019 12:06
URI:	http://gala.gre.ac.uk/id/eprint/9367

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