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Distributed Spectral Efficiency Maximization in Full-Duplex Cellular Networks
KTH, School of Electrical Engineering (EES), Automatic Control.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), Automatic Control.ORCID iD: 0000-0001-9810-3478
2016 (English)In: IEEE International Conference on Communication (ICC16): Workshop on Novel Medium Access and Resource Allocation for 5G Networks, Kuala Lumpur: IEEE Communications Society, 2016, 80-86 p., 7503768Conference paper, Published paper (Refereed)
Abstract [en]

Three-node full-duplex is a promising new transmission mode between a full-duplex capable wireless node and two other wireless nodes that use half-duplex transmission and reception respectively. Although three-node full-duplex transmissions can increase the spectral efficiency without requiring full-duplex capability of user devices, inter-node interference - in addition to the inherent self-interference - can severely degrade the performance. Therefore, as methods that provide effective self-interference mitigation evolve, the management of inter-node interference is becoming increasingly important. This paper considers a cellular system in which a full-duplex capable base station serves a set of half-duplex capable users. As the spectral efficiencies achieved by the uplink and downlink transmissions are inherently intertwined, the objective is to device channel assignment and power control algorithms that maximize the weighted sum of the uplink-downlink transmissions. To this end a distributed auction based channel assignment algorithm is proposed, in which the scheduled uplink users and the base station jointly determine the set of downlink users for full-duplex transmission. Realistic system simulations indicate that the spectral efficiency can be up to 89% better than using the traditional half-duplex mode. Furthermore, when the self-interference cancelling level is high, the impact of the user-to-user interference is severe unless properly managed.

Place, publisher, year, edition, pages
Kuala Lumpur: IEEE Communications Society, 2016. 80-86 p., 7503768
Keyword [en]
full-duplex, distributed algorithms, cellular networks, auction theory
National Category
Telecommunications
Research subject
Electrical Engineering; Information and Communication Technology
Identifiers
URN: urn:nbn:se:kth:diva-188973DOI: 10.1109/ICCW.2016.7503768ISI: 000386326800015Scopus ID: 2-s2.0-84979783793ISBN: 978-150900448-5 (print)Archive number: 1603.00671OAI: oai:DiVA.org:kth-188973DiVA: diva2:942366
Conference
2016 IEEE International Conference on Communications Workshops, ICC 2016, Kuala Lumpur, Malaysia, 23 May 2016 through 28 May 2016
Funder
Lars Hierta Memorial Foundation, FO20150976
Note

QC 20161121

Available from: 2016-06-23 Created: 2016-06-23 Last updated: 2017-04-03Bibliographically 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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