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On the Spectral Efficiency and Fairness in Full-Duplex Cellular Networks
KTH, School of Electrical Engineering (EES), Network and Systems engineering.ORCID iD: 0000-0002-4503-4242
KTH, School of Electrical Engineering (EES), Automatic Control. Ericsson Research.ORCID iD: 0000-0002-2289-3159
KTH, School of Electrical Engineering (EES), Network and Systems engineering.ORCID iD: 0000-0001-9810-3478
2017 (English)In: 2017 IEEE International Conference on Communications (ICC), Paris: Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 1-6, article id 7996391Conference paper, Published paper (Refereed)
Abstract [en]

To increase the spectral efficiency of wireless networks without requiring full-duplex capability of user devices, a potential solution is the recently proposed three-node full-duplex mode. To realize this potential, networks employing three-node full-duplex transmissions must deal with self-interference and user-to-user interference, which can be managed by frequency channel and power allocation techniques. Whereas previous works investigated either spectral efficient or fair mechanisms, a scheme that balances these two metrics among users is investigated in this paper. This balancing scheme is based on a new solution method of the multi-objective optimization problem to maximize the weighted sum of the per-user spectral efficiency and the minimum spectral efficiency among users. The mixed integer non-linear nature of this problem is dealt by Lagrangian duality. Based on the proposed solution approach, a low-complexity centralized algorithm is developed, which relies on large scale fading measurements that can be advantageously implemented at the base station. Numerical results indicate that the proposed algorithm increases the spectral efficiency and fairness among users without the need of weighting the spectral efficiency. An important conclusion is that managing user-to-user interference by resource assignment and power control is crucial for ensuring spectral efficient and fair operation of full-duplex networks.

Place, publisher, year, edition, pages
Paris: Institute of Electrical and Electronics Engineers (IEEE), 2017. p. 1-6, article id 7996391
Series
IEEE International Conference on Communications, ISSN 1550-3607
Keyword [en]
full-duplex, fairness, power control, assignment, cellular networks
National Category
Telecommunications
Research subject
Electrical Engineering; Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-202304DOI: 10.1109/ICC.2017.7996391ISI: 000424872100072Scopus ID: 2-s2.0-85028296591ISBN: 978-1-4673-8999-0 (print)OAI: oai:DiVA.org:kth-202304DiVA, id: diva2:1075666
Conference
2017 IEEE International Conference on Communications, ICC 2017, Paris, France, 21 May 2017 through 25 May 2017
Funder
Lars Hierta Memorial Foundation, FO20160454Wireless@kth
Note

QC 20170804

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2018-03-12Bibliographically approved
In thesis
1. Spectral Efficiency and Fairness Maximization in Full-Duplex Cellular Networks
Open this publication in new window or tab >>Spectral Efficiency and Fairness Maximization in Full-Duplex Cellular Networks
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Future cellular networks, the so-called 5G, are expected to provide explosive data volumes and data rates. To meet such a demand, the research communities are investigating new wireless transmission technologies. One of the most promising candidates is in-band full-duplex communications. These communications are characterized by that a wireless device can simultaneously transmit and receive on the same frequency channel. In-band full-duplex communications have the potential to double the spectral efficiencywhen compared to current half duplex systems. The traditional drawback of full-duplex was the interference that leaks from the own transmitter to its own receiver, the so- called self-interference, which renders the receiving signal unsuitable for communication.However, recent advances in self-interference suppression techniques have provided high cancellation and reduced the self-interference to noise floor levels, which shows full-duplex is becoming a realistic technology component of advanced wireless systems.

Although in-band full-duplex promises to double the data rate of existing wireless technologies, its deployment in cellular networks is challenging due to the large number of legacy devices working in half-duplex. A viable introduction in cellular networks is offered by three-node full-duplex deployments, in which only the base stations are full-duplex, whereas the user- or end-devices remain half-duplex. However, in addition to the inherent self-interference, now the interference between users, the user-to-user interference, may become the performance bottleneck, especially as the capability to suppress self-interference improves. Due to this new interference situation, user pairing and frequency channel assignment become of paramount importance, because both mechanisms can help to mitigate the user-to-user interference. It is essential to understand the trade-offs in the performance of full-duplex cellular networks, specially three-node full-duplex, in the design of spectral and energy efficient as well as fair mechanisms.

This thesis investigates the design of spectral efficient and fair mechanisms to improve the performance of full-duplex in cellular networks. The novel analysis proposed in this thesis suggests centralized and distributed user pairing, frequency channel assignment and power allocation solutions to maximize the spectral efficiency and fairness in future full-duplex cellular networks. The investigations are based on distributed optimization theory with mixed integer-real variables and novel extensions of Fast-Lipschitz optimization. The analysis sheds lights on two fundamental problems of standard cellular networks, namely the spectral efficiency and fairness maximization, but in the new context of full-duplex communications. The results in this thesis provide important understanding in the role of user pairing, frequency assignment and power allocation, and reveal the special behaviourbetween the legacy self-interference and the new user-to-user interference. This thesis can provide input to the standardization process of full-duplex communications, and have the potential to be used in the implementation of future full-duplex in cellular networks.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017
Series
TRITA-EE, ISSN 1653-5146 ; 2017:027
Keyword
full-duplex, power control, user assignment, cellular networks, fairness, spectral efficiency
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
urn:nbn:se:kth:diva-204607 (URN)978-91-7729-347-7 (ISBN)
Presentation
2017-04-28, Q2, Osquldas Väg 10, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170403

Available from: 2017-04-05 Created: 2017-04-03 Last updated: 2017-04-05Bibliographically approved

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