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Spectral Efficiency and Fairness Maximization in Full-Duplex Cellular Networks
KTH, School of Electrical Engineering (EES), Network and Systems engineering.ORCID iD: 0000-0002-4503-4242
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
Keywords [en]
full-duplex, power control, user assignment, cellular networks, fairness, spectral efficiency
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
URN: urn:nbn:se:kth:diva-204607ISBN: 978-91-7729-347-7 OAI: oai:DiVA.org:kth-204607DiVA, id: diva2:1086432
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
List of papers
1. Distributed Spectral Efficiency Maximization in Full-Duplex Cellular Networks
Open this publication in new window or tab >>Distributed Spectral Efficiency Maximization in Full-Duplex Cellular Networks
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, p. 80-86, article id 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
Keywords
full-duplex, distributed algorithms, cellular networks, auction theory
National Category
Telecommunications
Research subject
Electrical Engineering; Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-188973 (URN)10.1109/ICCW.2016.7503768 (DOI)000386326800015 ()2-s2.0-84979783793 (Scopus ID)
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: 2018-03-06Bibliographically approved
2. Fast-Lipschitz Power Control and User-Frequency Assignment in Full-Duplex Cellular Networks
Open this publication in new window or tab >>Fast-Lipschitz Power Control and User-Frequency Assignment in Full-Duplex Cellular Networks
2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 10, p. 6672-6687Article in journal (Refereed) Published
Abstract [en]

In cellular networks, the three-node full-duplex transmission mode has the po-tential to increase spectral efficiency without requiring full-duplex capability ofusers. Consequently, three-node full-duplex in cellular networks must deal with self-interference and user-to-user interference, which can be managed by power controland user-frequency assignment techniques. This paper investigates the problem ofmaximizing the sum spectral efficiency by jointly determining the transmit powersin a distributed fashion, and assigning users to frequency channels. The problem is for-mulated as a mixed-integer nonlinear problem, which is shown to be non-deterministicpolynomial-time hard. We investigate a close-to-optimal solution approach by dividingthe joint problem into a power control problem and an assignment problem. The powercontrol problem is solved by Fast-Lipschitz optimization, while a greedy solution withguaranteed performance is developed for the assignment problem. Numerical resultsindicate that compared with the half-duplex mode, both spectral and energy efficienciesof the system are increased by the proposed algorithm. Moreover, results show that thepower control and assignment solutions have important, but opposite roles in scenarioswith low or high self-interference cancellation. When the self-interference cancellationis high, user-frequency assignment is more important than power control, while powercontrol is essential at low self-interference cancellation.

Place, publisher, year, edition, pages
IEEE Communications Society, 2017
Keywords
full-duplex, power control, assignment, cellular networks
National Category
Telecommunications
Research subject
Telecommunication
Identifiers
urn:nbn:se:kth:diva-204605 (URN)10.1109/TWC.2017.2728062 (DOI)000412591400028 ()2-s2.0-85028856446 (Scopus ID)
Funder
Lars Hierta Memorial Foundation
Note

QC 20171106

Available from: 2017-03-29 Created: 2017-03-29 Last updated: 2018-03-06Bibliographically approved
3. Spectral Efficient and Fair User Pairing for Full-Duplex Communication in Cellular Networks
Open this publication in new window or tab >>Spectral Efficient and Fair User Pairing for Full-Duplex Communication in Cellular Networks
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 11, p. 7578-7593Article in journal (Refereed) Published
Abstract [en]

—A promising new transmission mode in cellular networks is the three-node full-duplex mode, which involves a base station with full-duplex capability and two half-duplex user transmissions on the same frequency channel for uplink and downlink. The three-node full-duplex mode can increase spectral efficiency, especially in the low transmit power regime, without requiring full-duplex capability at user devices. However, when a large set of users is scheduled in this mode, self-interference at the base station and user-to-user interference can substantially hinder the potential gains of full-duplex communications. This paper investigates the problem of grouping users to pairs and assigning frequency channels to each pair in a spectral efficient and fair manner. Specifically, the joint problem of user uplink/downlink frequency channel pairing and power allocation is formulated as a mixed integer nonlinear problem that is solved by a novel joint fairness assignment maximization algorithm. Realistic system level simulations indicate that the spectral efficiency of the users having the lowest spectral efficiency is increased by the proposed algorithm, while a high ratio of connected users in different loads and self-interference levels is maintained.

Place, publisher, year, edition, pages
IEEE Press, 2016
Keywords
full-duplex, power control, channel assignment, spectral efficient, cellular communications
National Category
Communication Systems
Research subject
Electrical Engineering; Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-192314 (URN)10.1109/TWC.2016.2604802 (DOI)000388674700026 ()2-s2.0-84988354730 (Scopus ID)
Projects
Wireless@KTH BUSE
Funder
Lars Hierta Memorial Foundation, FO20150976Swedish National Infrastructure for Computing (SNIC)Wireless@kth, BUSE
Note

QC 20161019

Available from: 2016-09-09 Created: 2016-09-09 Last updated: 2018-03-06Bibliographically approved
4. On the Spectral Efficiency and Fairness in Full-Duplex Cellular Networks
Open this publication in new window or tab >>On the Spectral Efficiency and Fairness in Full-Duplex Cellular Networks
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
Series
IEEE International Conference on Communications, ISSN 1550-3607
Keywords
full-duplex, fairness, power control, assignment, cellular networks
National Category
Telecommunications
Research subject
Electrical Engineering; Information and Communication Technology
Identifiers
urn:nbn:se:kth:diva-202304 (URN)10.1109/ICC.2017.7996391 (DOI)000424872100072 ()2-s2.0-85028296591 (Scopus ID)978-1-4673-8999-0 (ISBN)
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

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