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Cooperative Spectrum Sharing and Device-to-Device Communications
KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Radio Systems Laboratory (RS Lab). KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth.ORCID iD: 0000-0002-2370-4567
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The steep growth in the mobile data traffic has gained a lot of attention in recent years. This growth is mainly the result of emerging applications, multimedia services, and revolutions in the device technology. With current deployments and radio resources, operators will not be able to cope with the growing demands. Consequently, there is a need to either provide new resources or increase the efficiency of what is available. Proposed solutions for accommodating growing data traffic are based on improvements in three dimensions: efficient use of radio resources especially the spectrum, technology advancements, and densifying the current infrastructure. In this thesis, we focus on the spectrum dimension. Providing more spectrum is a long-term process. However, increasing the spectrum usage and efficiency can be put rapidly in practice. We discuss potential solutions in the area of spectrum sharing. Among enabling technologies to facilitate spectrum sharing, we consider the cognitive radio and device-to-device (D2D) communications.

In order to gain from sharing the spectrum, systems need to somehow deal with extra sources of interference. In the first part of the thesis, we consider a primary-secondary sharing model in cognitive radio networks. We employ the cooperative communication method in order to facilitate the access of the secondary system to the licensed spectrum of the primary system, and therefore increase the spectrum usage. The cooperation between the two systems is formed provided that it is beneficial for the primary system. In this way, the primary users' quality-of-service can be preserved while at the same time the secondary users can access the spectrum. This cooperative approach prevents both systems from concurrent transmissions. As a consequence, the need for interference control techniques are eliminated. We evaluate different models and transmission schemes and optimize the corresponding parameters to quantify the gain resulting from cooperative spectrum sharing.

In the second part of the thesis, we consider spectrum sharing within one system between different types of users. This is done in the context of D2D communications where close proximity users can transmit directly to each other. For this type of communications, either dedicated resources are allocated or resources of the cellular users are reused. We first study the feasibility of cooperation between D2D and cellular users and identify the scenarios where it can be beneficial. Then we take on a challenging problem which guarantees the gain from the D2D communication, namely the mode selection. For this problem, we characterize the decision criteria that determines if D2D communication is gainful. Next, we focus on the problem of interference in D2D communications underlaying cellular networks, where the same spectrum is reused in the spatial domain. In such scenarios, the potential gain is determined by how the interference is managed, which in turn depends on the amount of available information at the base station. The more information is required, the more signaling is needed. In this part of the thesis, we address the trade-off between the signaling overhead and the performance of the system and propose a novel approach for interference control which requires very little information on the D2D users.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. , x, 49 p.
Series
TRITA-ICT-COS, ISSN 1653-6347 ; 1405
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Communication Systems Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-145013OAI: oai:DiVA.org:kth-145013DiVA: diva2:715650
Presentation
2014-06-02, sal D, Forum, KTH-ICT, Isafjordsgatan 39, Kista, 13:00 (English)
Opponent
Supervisors
Funder
Wireless@kth
Note

QC 20140509

Available from: 2014-05-09 Created: 2014-05-05 Last updated: 2014-05-16Bibliographically approved
List of papers
1. Performance analysis of relay-assisted cognitive radio systems with superposition coding
Open this publication in new window or tab >>Performance analysis of relay-assisted cognitive radio systems with superposition coding
2012 (English)In: Proceedings of the IEEE 23rd International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), IEEE , 2012, 1226-1231 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study the problem of relay selection in a cooperative cognitive radio system in which a secondary transmitter can act as a relay for the primary transmitter in order to maximize the primary user's gain. Moreover, we take into account that the secondary users may have certain quality-of-service (QoS) requirements which need to be satisfied. In the cooperative scenario of a cognitive radio system, the primary user should have an incentive to allow the secondary user to transmit in its licensed band. At the same time, the secondary user should be able to transmit its own data with the required QoS in order to be willing to help the primary user's performance by relaying its data. Hence, we take into account both primary and secondary users' objectives. We use numerical methods in order to study how different parameters, such as assigned powers in the coding scheme, direct link reliability, and the number of secondary users affect the overall system performance. Our results show that the gain, which the primary user can achieve by cooperation, highly depends on the quality of its direct link as well as the secondary users' QoS requirements. Furthermore, the percentage of cooperation instances between secondary users and the primary user is dependent on the amount of power the secondary users allocate for relaying the primary's signal based on the direct link quality.

Place, publisher, year, edition, pages
IEEE, 2012
Series
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, ISSN 2166-9570
Keyword
Coding scheme, Cooperative scenarios, Direct links, ITS data, Performance analysis, QoS requirements, Relay selection, Super-position coding
National Category
Communication Systems
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-98778 (URN)10.1109/PIMRC.2012.6362533 (DOI)000312809400208 ()2-s2.0-84871965529 (Scopus ID)978-146732569-1 (ISBN)
Conference
IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sydney, NSW
Funder
ICT - The Next Generation
Note

QC 20130116

Available from: 2012-07-02 Created: 2012-07-02 Last updated: 2014-05-09Bibliographically approved
2. On Secondary User Transmission Schemes in Relay-Assisted Cognitive Radio Networks
Open this publication in new window or tab >>On Secondary User Transmission Schemes in Relay-Assisted Cognitive Radio Networks
2013 (English)In: 2013 IEEE 77th Vehicular Technology Conference (VTC Spring), IEEE , 2013, 6692665- p.Conference paper, Published paper (Refereed)
Abstract [en]

We consider a cooperative cognitive radio network with one primary user and many secondary users. In each transmission frame, one secondary user is selected to act as a relay for the primary user and also transmits its own data. Three different schemes for the secondary user's transmission is studied, namely, time-splitting, superposition coding, and a combined scheme that takes advantages of both time-splitting and superposition coding schemes. We formulate the relay selection problem for each scheme with the objective of maximizing the secondary user's data rate while satisfying a pre-defined gain threshold for the primary user. This constraint provides an incentive for the primary user when allowing the secondary user access its licensed band. We obtain the optimal solution for this problem in each scheme, on which the relay selection is based on. Finally, we compare the performance of different schemes using Monte-Carlo simulations.

Place, publisher, year, edition, pages
IEEE, 2013
Series
IEEE Vehicular Technology Conference Proceedings, ISSN 1550-2252
Keyword
Cognitive radio network, Combined schemes, Cooperative Cognitive Radio Networks, Monte-Carlo simulations, Optimal solutions, Super-position coding, Transmission frames, Transmission schemes
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-116589 (URN)10.1109/VTCSpring.2013.6692665 (DOI)000331081500288 ()2-s2.0-84893523068 (Scopus ID)978-1-4673-6337-2 (ISBN)
Conference
2013 IEEE 77th Vehicular Technology Conference, VTC Spring 2013; Dresden; Germany; 2 June 2013 through 5 June 2013
Projects
Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society (METIS)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20140312

Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2014-05-09Bibliographically approved
3. Cooperative Device-to-Device Communications in the Downlink of Cellular Networks
Open this publication in new window or tab >>Cooperative Device-to-Device Communications in the Downlink of Cellular Networks
2014 (English)In: Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), 2014, 2265-2270 p.Conference paper, Published paper (Refereed)
Abstract [en]

We propose a cooperative device-to-device (D2D) communications framework in order to combat the problem of congestion in crowded communication environments. The idea is to allow a D2D transmitter to act as an in-band relay for a cellular link and at the same time transmit its own data by employing superposition coding in the downlink. Cooperation between the cellular link and D2D transmitter eases down the requirement on the interference. The main benefit of the proposed method is in increasing the number of connections per unit area with the same spectrum usage. It could also be beneficial to offload over-loaded cells. We formulate our problem to minimize the assigned power for cooperation while making sure the cellular user’s performance does not degrade. Our results show that cooperation possibilities and improvement in overall cell capacity increase with the number of cellular users within the cell as well as the cell size.

Series
IEEE Wireless Communications and Networking Conference. Proceedings, ISSN 1525-3511
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-139017 (URN)10.1109/WCNC.2014.6952682 (DOI)9781479930838 (ISBN)
Conference
2014 IEEE Wireless Communications and Networking Conference, WCNC 2014; Istanbul; Turkey; 6 April 2014 through 9 April 2014
Projects
Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society (METIS)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20150529

Available from: 2013-12-23 Created: 2013-12-23 Last updated: 2015-06-11Bibliographically approved
4. Closed-Form Optimality Characterization of Network-Assisted Device-to-Device Communications
Open this publication in new window or tab >>Closed-Form Optimality Characterization of Network-Assisted Device-to-Device Communications
2014 (English)In: Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), 2014Conference paper, Published paper (Refereed)
Abstract [en]

This paper considers the mode selection problem for network-assisted device-to-device (D2D) communications with multiple antennas at base station. We study transmission in both dedicated and shared frequency bands. Given the type of resources (i.e., dedicated or shared), the user equipment (UE) decides to transmit in the conventional cellular mode or directly to its corresponding receiver in D2D mode. We formulate this problem under two different objectives. The first problem is to maximize the quality-of-service (QoS) given a transmit power, and the second problem is to minimize the transmit power given a QoS requirement. We derive closed-form results for the optimal decision and show that the two problem formulations behave differently. Taking a geometrical approach, we study the area around the transmitter UE where the receiving UE should be to have D2D mode optimality, and how it is affected by the transmit power, QoS, and the number of base station antennas.

Series
IEEE Wireless Communications and Networking Conference, WCNC, ISSN 1525-3511 ; 6952080
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-139018 (URN)10.1109/WCNC.2014.6952080 (DOI)2-s2.0-84912137291 (Scopus ID)
Conference
IEEE Wireless Communications and Networking Conference (WCNC), Istanbul, Turkey
Note

QC 20140509

Available from: 2013-12-23 Created: 2013-12-23 Last updated: 2015-06-11Bibliographically approved
5. Interference management for multiple device-to-device communications underlaying cellular networks
Open this publication in new window or tab >>Interference management for multiple device-to-device communications underlaying cellular networks
2013 (English)In: 2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), IEEE conference proceedings, 2013, 223-227 p.Conference paper, Published paper (Refereed)
Abstract [en]

We study the problem of interference management for device-to-device (D2D) communications where multiple D2D users may coexist with one cellular user. The problem is to optimize the transmit power levels of D2D users to maximize the cell throughput while preserving the signal-to-noise-plus-interference ratio (SINR) performance for the cellular user. This is the so-called multi rate power control problem. We investigate the problem under two assumptions, the availability of the instantaneous or average channel state information (CSI) at the base station. In the first case, D2D transmit power levels adapt to fast fading, whereas in the second case, they only adapt to slow fading. In the latter assumption, the cellular user has a maximum outage probability requirement. With numerical results, we study the trade-off between the signaling overhead, that is frequent CSI feedbacks, and the overall system performance, that is the maximum achievable cell capacity, for D2D communications underlying cellular networks.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2013
Keyword
D2D communications, Device-to-Device communications, Deviceto-device (D2D) communication, Interference management, Outage probability, Power control problem, Signal to noise plus interference ratio, Signaling overheads
National Category
Telecommunications Communication Systems
Identifiers
urn:nbn:se:kth:diva-128565 (URN)10.1109/PIMRC.2013.6666135 (DOI)000346481200042 ()2-s2.0-84893296293 (Scopus ID)978-146736235-1 (ISBN)
Conference
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2013; London; United Kingdom; 8 September 2013 through 11 September 2013
Projects
Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society (METIS)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20131108

Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2015-12-03Bibliographically approved
6. Interference Constrained Device-to-Device Communications
Open this publication in new window or tab >>Interference Constrained Device-to-Device Communications
2014 (English)In: 2014 IEEE International Conference on Communications, ICC 2014, IEEE Computer Society, 2014, 5245-5250 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper considers a scenario in which multiple device-to-device (D2D) users can reuse the uplink resources of a cellular network to transmit directly to their corresponding receivers. The aggregated interference from the D2D users is limited by applying a threshold on the allowable interference in the base station. The problem is solved under two types of constraints, namely, the peak interference and average interference constraints. In the former, we assume that full channel state information (CSI) is available at the base station, and we optimize the allowable transmit power for the D2D users so that the number of coexisting D2D communications is maximized. We further define a quality-of-service constraint for the D2D users. In practice, however, it is difficult to have complete CSI at the base station as it imposes heavy signaling overhead. Therefore, in the latter scenario, we assume that no knowledge about the location of D2D users and their CSI are available at the base station. This approach does not impose any signaling overhead. Our results show that even with no CSI knowledge, we are able to improve the system performance in terms of throughput by allowing coexisting D2D communications while satisfying the cellular user's constraints.

Place, publisher, year, edition, pages
IEEE Computer Society, 2014
Keyword
Base stations, Quality of service, Cellular network, D2D communications, Device-to-Device communications, Interference constraints, Signaling overheads, Transmit power
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-143898 (URN)10.1109/ICC.2014.6884154 (DOI)2-s2.0-84906996421 (Scopus ID)978-147992003-7 (ISBN)
Conference
2014 1st IEEE International Conference on Communications, ICC 2014; Sydney, NSW; Australia; 10 June 2014 through 14 June 2014
Projects
Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society (METIS)
Funder
EU, FP7, Seventh Framework ProgrammeWireless@kth
Note

QC 20140922

Available from: 2014-04-01 Created: 2014-04-01 Last updated: 2015-05-29Bibliographically approved

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