Change search
ReferencesLink to record
Permanent link

Direct link
Cognitive Radio Networks: Elements and Architectures
Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As mobility and computing becomes ever more pervasive in society and business, the non-optimal use of radio resources has created many new challenges for telecommunication operators. Usage patterns of modern wireless handheld devices, such as smartphones and surfboards, have indicated that the signaling traffic generated is many times larger than at a traditional laptop. Furthermore, in spite of approaching theoretical limits by, e.g., the spectral efficiency improvements brought by 4G, this is still not sufficient for many practical applications demanded by end users. Essentially, users located at the edge of a cell cannot achieve the high data throughputs promised by 4G specifications. Worst yet, the Quality of Service bottlenecks in 4G networks are expected to become a major issue over the next years given the rapid growth of mobile devices. The main problems are because of rigid mobile systems architectures with limited possibilities to reconfigure terminals and base stations depending on spectrum availability. Consequently, new solutions must be developed that coexist with legacy infrastructures and more importantly improve upon them to enable flexibility in the modes of operation. To control the intelligence required for such modes of operation, cognitive radio technology is a key concept suggested to be part of the so-called beyond 4th generation mobile networks. The basic idea is to allow unlicensed users access to licensed spectrum, under the condition that the interference perceived by the licensed users is minimal. This can be achieved with the help of devices capable of accurately sensing the spectrum occupancy, learning about temporarily unused frequency bands and able to reconfigure their transmission parameters in such a way that the spectral opportunities can be effectively exploited. Accordingly, this indicates the need for a more flexible and dynamic allocation of the spectrum resources, which requires a new approach to cognitive radio network management. Subsequently, a novel architecture designed at the application layer is suggested to manage communication in cognitive radio networks. The goal is to improve the performance in a cognitive radio network by sensing, learning, optimization and adaptation.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology , 2014. , 204 p.
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 2
Keyword [en]
Cognitive radio network management, spectrum access, multiconstrained routing optimization, multi-dimensional adaptation, middleware
National Category
Telecommunications Computer Science
URN: urn:nbn:se:bth-00575Local ID: 978-91-7295-272-0OAI: diva2:834278
Available from: 2014-04-10 Created: 2013-12-19 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

fulltext(8089 kB)65 downloads
File information
File name FULLTEXT01.pdfFile size 8089 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Communication Systems
TelecommunicationsComputer Science

Search outside of DiVA

GoogleGoogle Scholar
Total: 65 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 171 hits
ReferencesLink to record
Permanent link

Direct link