Paper Info
Title
Distributed power control algorithm for cognitive radios with primary protection via spectrum sensing under user mobility
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.
Year
DOI
Venue
2012
10.1016/j.adhoc.2011.02.005
Ad Hoc Networks
Keywords
Field
DocType
Transmit power control,Spectrum sensing,Mobility,Cognitive radios
Convergence (routing),Signal-to-interference ratio,Transmitter,Computer science,Power control,Quality of service,Computer network,Interference (wave propagation),Cognitive radio,Cognitive network,Distributed computing
Journal
Volume
Issue
ISSN
10
5
Ad Hoc Networks
Citations 
PageRank 
References 
3
0.39
14
Authors
3
Name
Order
Citations
PageRank
Olasunkanmi Durowoju1132.04
Kamran Arshad232826.17
Klaus Moessner31077112.48