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Energy-Aware Wireless Relay Selection in Load-Coupled OFDMA Cellular Networks
Linkoping Univ, Dept Sci & Technol, S-60174 Linkoping, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computing Science. Linkoping Univ, Dept Sci & Technol, S-60174 Linkoping, Sweden..
Linkoping Univ, Dept Sci & Technol, S-60174 Linkoping, Sweden..ORCID iD: 0000-0003-4416-7702
Linkoping Univ, Dept Sci & Technol, S-60174 Linkoping, Sweden..
2017 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 21, no 1, p. 144-147Article in journal (Refereed) Published
Abstract [en]

We investigate transmission energy minimization via optimizing wireless relay selection in orthogonal-frequency-division multiple access networks. We take into account the impact of the load of cells on transmission energy. We prove the NP-hardness of the energy-aware wireless relay selection problem. To tackle computational complexity, a partial optimality condition is derived for providing insights in respect of designing an effective and efficient algorithm. Numerical results show the resulting algorithm achieves high energy performance.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017. Vol. 21, no 1, p. 144-147
Keywords [en]
Heterogeneous network, wireless relay, OFDMA, energy efficiency
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:uu:diva-319321DOI: 10.1109/LCOMM.2016.2615604ISI: 000393788000036OAI: oai:DiVA.org:uu-319321DiVA, id: diva2:1087969
Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2019-08-19Bibliographically approved
In thesis
1. Network Optimization of Evolving Mobile Systems with Presence of Interference Coupling
Open this publication in new window or tab >>Network Optimization of Evolving Mobile Systems with Presence of Interference Coupling
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The rapid development from 4G to 5G of mobile communications poses significant challenges in providing high rate and capacity, making it more crucial for efficient utilization of time-frequency resource via optimally configuring the network. Mathematical optimization serves as a powerful tool for addressing this type of problems. However, gauging its potential in large-scale cellular networks is non-trivial due to the inherent coupling relation of interference among cells. To address this issue, the dissertation adopts a so-called load-coupling system that mathe-matically formulates the mutual influence caused by radio resource allocation among cells. The model defines the time-frequency resource consumption in each cell as the cell load. The load of one cell governs the interference that the cell generates to the others, since the cell trans-mits more frequently with higher load. The model enables joint optimization of resource al-location in multiple cells with respect to the dynamics of resource occupancy of cells. Under the load coupling model, the dissertation applies mathematical optimization to resolve resource management problems with respect to a number of evolving technologies, such as coordinated multipoint (CoMP) transmission, wireless relays, cloud radio access networks (C-RAN), and non-orthogonal multiple access (NOMA). Six research papers are included in the dissertation. Paper I addresses the question of how network planning and coordination may increase the ef-ficiency of spectrum usage, by jointly optimizing user association and resource allocation with CoMP. Paper II investigates the potential of relay cooperation for energy saving. As an extension of Paper I, Paper III studies the capacity maximization for a target group of users, while keep-ing the quality-of-service (QoS) of other users being strictly met. Paper IV provides a general framework and a series of theoretical analysis for algorithmically enabling resource optimization in multi-cell NOMA with load coupling, where users are allowed to group together for sharing time-frequency resource by successive interference cancellation (SIC). Under this framework, Paper V explores the potential of NOMA networks. For a restricted setup of NOMA, the paper achieves globally optimal resource usage efficiency, in terms of power allocation, user pair se-lection, and time-frequency resource allocation. Finally, Paper VI, serving as a complementary note, overcomes a key obstacle in analyzing convergence of applying load coupling in NOMA networks.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 37
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1843
Keywords
Resource optimization, load coupling, OFDMA, NOMA
National Category
Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:uu:diva-391133 (URN)978-91-513-0726-8 (ISBN)
Public defence
2019-10-07, ITC 1211, Lägerhyddsvägen 2, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2019-09-10 Created: 2019-08-19 Last updated: 2019-09-10

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