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Distributed spectrum access with energy constraint for heterogeneous channels
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. (Communication System Lab)
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.
The Scientific and Technological Research Council of Turkey.
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS.ORCID iD: 0000-0003-4986-6123
2010 (English)In: 2010 Proceedings of the 5th International Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCom 2010, Cannes, 2010Conference paper, Published paper (Refereed)
Abstract [en]

The demand for wireless communications services has increased the amount of spectrum resources required, promoting research interest in dynamic spectrum allocation schemes. There exist many promising solutions to allocate spectrum on a dynamic basis in order to get an efficient spectrum usage. One particular form is auction mechanism, tailored for allocating transmission rights on a short term basis to provide efficient allocation of scarce resources. However, most existing approaches are focused on homogeneous settings where all channels are treated as if they have the same propagation characteristics. In this work we consider two distributed auction schemes; sequential and concurrent, based on sequential ascending and combinatorial bidding, respectively, taking into account the propagation conditions of the channels (heterogeneous settings). The performance of these schemes is compared to two reference cases: (i) distributed homogeneous channels allocation (channel-agnostic case), and (ii) the centralized allocation scheme. Experimental results suggest that auction mechanisms which take into account the channel characteristics improve spectrum utilization under energy constraint. For wireless cellular networks with high unit energy cost (low coverage) concurrent access gives a better utilization of the spectrum and energy resources with higher service providers utility.

Place, publisher, year, edition, pages
Cannes, 2010.
Keyword [en]
Auction mechanisms, Channel characteristics, Concurrent access, Distributed Auctions, Dynamic spectrum allocations, Energy constraint, Energy cost, Heterogeneous channels, Propagation characteristics, Scarce resources, Service provider, Short term, Spectrum access, Spectrum usage, Spectrum utilization, Transmission rights, Wireless cellular networks, Wireless communications, Cellular neural networks, Dynamics, Energy resources, Radio, Spectroscopy, Wireless telecommunication systems, Wireless networks
National Category
Other Computer and Information Science
Identifiers
URN: urn:nbn:se:kth:diva-33993DOI: 10.4108/ICST.CROWNCOM2010.9242Scopus ID: 2-s2.0-77958168642ISBN: 9781424458868 (print)OAI: oai:DiVA.org:kth-33993DiVA: diva2:418423
Note

QC 20110523

Available from: 2011-05-23 Created: 2011-05-23 Last updated: 2014-01-16Bibliographically approved
In thesis
1. Topics in Dynamic Spectrum Access: Market Based Spectrum Sharing and Secondary User Access in Radar Bands
Open this publication in new window or tab >>Topics in Dynamic Spectrum Access: Market Based Spectrum Sharing and Secondary User Access in Radar Bands
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The steady growth in demand for spectrum has increased research interest in dynamic spectrum access schemes. This thesis studies some challenges in dynamic spectrum access based on two strategies: open sharing and hierarchical access. (1) In the open sharing model, the channels are allocated based on an auction process, taking into account the propagation characteristics of the channels, termed as channel heterogeneity. Two distributed dynamic spectrum access schemes are evaluated, sequential and concurrent. We show that the concurrent accessmechanismperforms better in terms of channel utilization and energy consumption, especially in wireless cellular network with an energy constraint. (2) In the hierarchical model, we assess the opportunities for secondary access in the radar band at 5.6GHz. The primary user is a meteorological radar and WLANs are the secondary users. The secondary users implement an interference protection mechanism to protect the radar, such that the WLAN’s transmission is regulated by an interference threshold. We evaluate the aggregate interference caused to the radar from multiple WLANs transmitting. We derive a mathematicalmodel to approximate the probability distribution function of the aggregate interference at the primary user, considering two cases: when secondary users are homogeneously distributed, and when they are heterogeneously distributed. The heterogeneous distribution of secondary users is modeled using an annulus sector with a higher density, called a hot zone. Finally, we evaluate opportunities for secondary access when WLANs employ an interference protection mechanism that considers the radar’s antenna pattern, such that temporal opportunities for transmission exist. The analytical probability distribution function of the interference is verified showing a good agrement with a Monte Carlo simulation. We show that the aggregate interference is sensitive to the propagation environment, thus in the rural case interference is more severe when compared to the urban case. In the evaluation of the hot zonemodel, we observe that the heterogenous distribution of secondary users has impact on the aggregate interference if the hot zone is near to the radar. The mathematical framework presented in this thesis can easily be adapted to assess interference to other types of primary and secondary users.

 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xi, 42 p.
Series
Trita-ICT-COS, ISSN 1653-6347 ; 1105
Keyword
spectrum sharing, radar band, cognitive radio
National Category
Telecommunications Information Science
Identifiers
urn:nbn:se:kth:diva-33791 (URN)
Presentation
2011-06-15, C2-Electrum 1, Isafjordsgatan 26, Kista, 14:00 (English)
Opponent
Supervisors
Note
QC 20110523Available from: 2011-05-23 Created: 2011-05-17 Last updated: 2011-05-23Bibliographically approved
2. Resource Sharing and Network Deployment Games: In Open Wireless Access Markets
Open this publication in new window or tab >>Resource Sharing and Network Deployment Games: In Open Wireless Access Markets
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xiv, 81 p.
Series
TRITA-ICT-COS, ISSN 1653-6347 ; 1107
National Category
Other Computer and Information Science
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-39480 (URN)
Presentation
2011-10-04, C1, Electrum 1, Isafjordsgatan 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
MODyS
Funder
Wireless@kth
Note

QC 20110912

Available from: 2011-09-12 Created: 2011-09-09 Last updated: 2014-01-16Bibliographically approved

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Zander, Jens

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