Interference control and radio spectrum allocation in shared spectrum access

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School of Electrical Engineering | Doctoral thesis (article-based) | Defence date: 2016-08-05
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Author
Date
2016
Department
Tietoliikenne- ja tietoverkkotekniikan laitos
Department of Communications and Networking
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Mcode
Degree programme
Language
en
Pages
94 + app. 70
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 125/2016
Abstract
With demands on the radio spectrum intensifying, it is necessary to use this scarce resource as efficiently as possible. One way forward is to apply flexible authorization schemes such as shared spectrum access. While such schemes are expected to make additional radio resource available and lower the spectrum access barriers, they also bring new challenges toward effectively dealing with the created extra interference which degrades the performance of networks, limiting the potential gains in a shared use of spectrum. In this thesis, to address the interference issue, different spectrum access schemes and deployment scenarios are investigated.  Firstly, we consider licensed shared access where database-assisted TV white space network architecture is employed to facilitate the controlled access of the secondary system to the TV band. The operation of the secondary system is allowed only if the quality of service experienced by the incumbent users is preserved. Furthermore, the secondary system should benefit itself from utilizing the TV band in licensed shared access mode. One challenge for efficient operation of the licensed secondary system is to control the cross-tier interference generated at the TV receiver, taking into account the self-interference in the secondary system.  Secondly, we consider co-primary shared access where multiple operators share a part of their spectrum. This can be done in two different operational levels, users and cells. The user level is done in the context of D2D communications where two users subscribed to different operators can transmit directly to each other. The cell level allows spectrum sharing between two small cells, e.g., indoor and outdoor small cells, in a dense urban environments. The main challenges for such scenarios are to manage the cross-tier interference generated by other users or cells subscribed to different operators, and to identify the amount of radio spectrum each operator contributes.  There are several approaches to reduce the risk of interference, but they often come at a high price in terms of complexity and signaling overhead. In this thesis, we aim to propose low complexity mechanisms that take interference control and radio spectrum allocation into account. The proposed mechanisms are based on tractable models which characterize the effects of the fundamental design parameters on the system behavior in shared spectrum access. The models are leveraged to capture the statistic of the aggregate interference and its effects on the performance metrics.
Description
Supervising professor
Jäntti, Riku, Prof., Aalto University, Department of Communications and Networking, Finland
Thesis advisor
Jäntti, Riku, Prof., Aalto University, Department of Communications and Networking, Finland
Keywords
Flexible spectrum use, interference models, stochastic geometry, game theory
Other note
Parts
  • [Publication 1]: B. Cho, K. Koufos, K. Ruttik, and R. Jäntti. Power allocation in the TV white space under constraint on secondary system self-interference. Journal of Electrical and Computer Engineering, vol. 2012, June 2012. doi: 10.1155/2012/245895
  • [Publication 2]: B. Cho, K. Koufos, and R. Jäntti. Interference control in cognitive wireless networks by tuning the carrier sensing threshold. In Proc. IEEE International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM), June 2013. doi: 10.1109/CROWNCom.2013.6636831
  • [Publication 3]: B. Cho, K. Koufos, and R. Jäntti. Bounding the mean interference in matérn type II hard-core wireless networks. IEEE Wireless Communications Letters, vol. 2, no. 5, pp. 563-566, October 2013. doi: 10.1109/WCL.2013.072513.130308
  • [Publication 4]: B. Cho, K. Koufos, and R. Jäntti. Spectrum allocation and mode selection for overlay D2D using carrier sensing threshold. In Proc. IEEE International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCOM), pp. 26-31, June 2014. doi: 10.4108/icst.crowncom.2014.255600
  • [Publication 5]: B. Cho, K. Koufos, R. Jäntti, Z. Li, and M. A. Uusitalo. Spectrum allocation for multi-operator Device-to-Device communication. In Proc. IEEE International Conference on Communications (ICC), pp. 5454-5459, June 2015
  • [Publication 6]: B. Cho, K. Koufos, R. Jäntti, and S.-L, Kim. Co-primary spectrum sharing for inter-operator Device-to-Device communication. IEEE Journal of Selected Area in Communications (JSAC), submitted on 30th, April 2016
  • [Publication 7]: B. Cho, K. Koufos, K. Ruttik, and R. Jäntti. Modeling the interference generated from car base stations towards indoor femto-cells. In Proc. International Federation of Automatic control (IFAC) Symposium on Telematics Applications, pp. 96-101, November 2013. doi: 10.3182/20131111-3-KR-2043.00030
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Permanent link to this item
https://urn.fi/URN:ISBN:978-952-60-6888-6
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[diss] Sähkötekniikan korkeakoulu / ELEC