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Kosta, A., Pappas, N., Ephremides, A. & Angelakis, V. (2018). Age of Information and Throughput in a Shared Access Network with Heterogeneous Traffic. In: IEEE Global Telecommunications Conference (GLOBECOM), 2018, pp. 1-6.: . Paper presented at IEEE Global Telecommunications Conference (GLOBECOM).
Open this publication in new window or tab >>Age of Information and Throughput in a Shared Access Network with Heterogeneous Traffic
2018 (English)In: IEEE Global Telecommunications Conference (GLOBECOM), 2018, pp. 1-6., 2018Conference paper, Published paper (Refereed)
Abstract [en]

We consider a cognitive shared access scheme consisting of a high priority primary node and a low priority network with N secondary nodes accessing the spectrum. Assuming bursty traffic at the primary node, saturated queues at the secondary nodes, and multipacket reception capabilities at the receivers, we derive analytical expressions of the time average age of information of the primary node and the throughput of the secondary nodes. We formulate two optimization problems, the first aiming to minimize the time average age of information of the primary node subject to an aggregate secondary throughput requirement. The second problem aims to maximize the aggregate secondary throughput of the network subject to a maximum time average staleness constraint. Our results provide guidelines for the design of a multiple access system with multipacket reception capabilities that fulfills both timeliness and throughput requirements.

Series
IEEE Global Communications Conference ; 2018
Keywords
Throughput, Receivers, Information age, Delays, Aggregates, Queueing analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
Identifiers
urn:nbn:se:liu:diva-154649 (URN)10.1109/GLOCOM.2018.8647212 (DOI)000465774300065 ()978-1-5386-4727-1 (ISBN)978-1-5386-4728-8 (ISBN)
Conference
IEEE Global Telecommunications Conference (GLOBECOM)
Note

Funding agencies: European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [642743]

Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-06-28
Papastratis, I., Charalambous, T. & Pappas, N. (2018). Indoor Navigation of Quadrotors via Ultra-Wideband Wireless Technology. In: 2018 ADVANCES IN WIRELESS AND OPTICAL COMMUNICATIONS (RTUWO): . Paper presented at 4th International Scientific Conference on Advances in Wireless and Optical Communications (RTUWO), Riga, Latvia, 15-16 Nov. 2018 (pp. 106-111). IEEE
Open this publication in new window or tab >>Indoor Navigation of Quadrotors via Ultra-Wideband Wireless Technology
2018 (English)In: 2018 ADVANCES IN WIRELESS AND OPTICAL COMMUNICATIONS (RTUWO), IEEE , 2018, p. 106-111Conference paper, Published paper (Refereed)
Abstract [en]

This work focuses on controlling the position and trajectory of a quadrotor indoors with high positioning accuracy. The movement of the quadrotor is tracked by an Ultra-WideBand (UWB) system which provides wireless message communication that enables communication with the quadrotor. In this feedback control system, the main challenge is that the system has limited communication bandwidth, which may cause packet losses and time delays, and the quadrotor is extremely sensitive to such effects. Our main objective is to develop a controller and jointly tune a positioning system to stabilize the system by trading between latency and reliability. The performance of our developed schemes are verified using a testbed platform.

Place, publisher, year, edition, pages
IEEE, 2018
National Category
Control Engineering
Identifiers
urn:nbn:se:liu:diva-156596 (URN)10.1109/RTUWO.2018.8587889 (DOI)000462986300020 ()2-s2.0-85061063536 (Scopus ID)978-1-5386-5558-0 (ISBN)
Conference
4th International Scientific Conference on Advances in Wireless and Optical Communications (RTUWO), Riga, Latvia, 15-16 Nov. 2018
Available from: 2019-05-14 Created: 2019-05-14 Last updated: 2019-08-05Bibliographically approved
Tatino, C., Malanchini, I., Pappas, N. & Yuan, D. (2018). Maximum Throughput Scheduling for Multi-connectivity in Millimeter-Wave Networks. In: 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt): International Workshop on Resource Allocation, Cooperation and Competition in Wireless Networks (RAWNET). Paper presented at 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Shanghai, China, May 7-11, 2018. IEEE
Open this publication in new window or tab >>Maximum Throughput Scheduling for Multi-connectivity in Millimeter-Wave Networks
2018 (English)In: 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt): International Workshop on Resource Allocation, Cooperation and Competition in Wireless Networks (RAWNET), IEEE, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Multi-connectivity is emerging as promising solution to provide reliable communications and seamless connectivity at the millimeter-wave frequency range. Due to the obstacles that cause frequent interruptions at such high frequency range, connectivity to multiple cells can drastically increase the network performance in terms of throughput and reliability by coordi- nation among the network elements. In this paper, we propose an algorithm for the link scheduling optimization that maximizes the network throughput for multi-connectivity in millimeter-wave cellular networks. The considered approach exploits a centralized architecture, fast link switching, proactive context preparation and data forwarding between millimeter-wave access points and the users. The proposed algorithm is able to numerically approach the global optimum and to quantify the potential gain of multi-connectivity in millimeter-wave cellular networks. 

Place, publisher, year, edition, pages
IEEE, 2018
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-146211 (URN)10.23919/WIOPT.2018.8362891 (DOI)000434872700066 ()9783903176003 (ISBN)9781538646212 (ISBN)
Conference
16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), Shanghai, China, May 7-11, 2018
Funder
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile CommunicationsEU, Horizon 2020, 643002
Note

Funding agencies: European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [643002]; CENIIT

Available from: 2018-04-02 Created: 2018-04-02 Last updated: 2018-09-28
Pappas, N. (2018). Performance Analysis of a System with Bursty Traffic and Adjustable Transmission Times. In: 15th International Symposium on Wireless Communication System (ISWCS 2018): SS5 - Ultra-Reliable Low Latency Communications. Paper presented at 15th International Symposium on Wireless Communication Systems (ISWCS), Lisbon, Portugal, 28-31 August, 2018 (pp. 1-6). IEEE Communications Society
Open this publication in new window or tab >>Performance Analysis of a System with Bursty Traffic and Adjustable Transmission Times
2018 (English)In: 15th International Symposium on Wireless Communication System (ISWCS 2018): SS5 - Ultra-Reliable Low Latency Communications, IEEE Communications Society, 2018, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we consider the case where a source with bursty traffic can adjust the transmission duration in order to increase the reliability. The source is equipped with a queue in order to store the arriving packets. We model the system with a discrete time Markov Chain, and we characterize the performance in terms of service probability and average delay per packet. The accuracy of the theoretical results is validated through simulations. This work serves as an initial step in order to provide a framework for systems with arbitrary arrivals and variable transmission durations and it can be utilized for the derivation of the delay distribution and the delay violation probability.

Place, publisher, year, edition, pages
IEEE Communications Society, 2018
Series
International Symposium on Wireless Communication Systems (ISWCS), E-ISSN 2154-0225 ; 2018
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-149649 (URN)10.1109/ISWCS.2018.8491231 (DOI)9781538650059 (ISBN)9781538650042 (ISBN)9781538650066 (ISBN)
Conference
15th International Symposium on Wireless Communication Systems (ISWCS), Lisbon, Portugal, 28-31 August, 2018
Funder
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile CommunicationsEU, Horizon 2020, 645705
Available from: 2018-07-14 Created: 2018-07-14 Last updated: 2019-03-26Bibliographically approved
Dimitriou, I. & Pappas, N. (2018). Performance Analysis of an Adaptive Queue-Aware Random Access Scheme with Random Traffic. In: 2018 IEEE International Conference on Communications (ICC) Proceedings Kansas City, MO, USA 20–24 May 2018: . Paper presented at IEEE International Conference on Communications (ICC), Kansas City, MO, USA 20–24 May 2018 (pp. 1-6). IEEE Communications Society
Open this publication in new window or tab >>Performance Analysis of an Adaptive Queue-Aware Random Access Scheme with Random Traffic
2018 (English)In: 2018 IEEE International Conference on Communications (ICC) Proceedings Kansas City, MO, USA 20–24 May 2018, IEEE Communications Society, 2018, p. 1-6Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we consider an adaptive two-user random access scheme with multipacket reception (MPR) ca- pabilities. A user adapts its transmission characteristics based on the status of the other user. The users have external random traffic stored in their queues. We derive the stable throughput region of the system and the convexity conditions of this region. We derive analytically the queueing delay by formulating and solving a Riemann-Hilbert boundary value problem. Finally, we evaluate numerically the presented theoretical results. 

Place, publisher, year, edition, pages
IEEE Communications Society, 2018
Series
IEEE International Conference on Communications (ICC), E-ISSN 1938-1883 ; 2018
National Category
Communication Systems Telecommunications Probability Theory and Statistics
Identifiers
urn:nbn:se:liu:diva-144827 (URN)10.1109/ICC.2018.8422688 (DOI)9781538631805 (ISBN)9781538631812 (ISBN)
Conference
IEEE International Conference on Communications (ICC), Kansas City, MO, USA 20–24 May 2018
Projects
CENIITEU project DECADE under Grant H2020-MSCA-2014-RISE: 645705
Funder
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile CommunicationsEU, Horizon 2020, 645705
Available from: 2018-02-01 Created: 2018-02-01 Last updated: 2019-05-09Bibliographically approved
Kountouris, M., Pappas, N. & Avranas, A. (2018). QoS Provisioning in Large Wireless Networks. In: 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt): Workshop on Spatial Stochastic Models for Wireless Networks (SpaSWiN). Paper presented at 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), May 7 to 11, 2018 in Shanghai, China.
Open this publication in new window or tab >>QoS Provisioning in Large Wireless Networks
2018 (English)In: 16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt): Workshop on Spatial Stochastic Models for Wireless Networks (SpaSWiN), 2018Conference paper, Published paper (Refereed)
Abstract [en]

Quality of service (QoS) provisioning in next-generation mobile communications systems entails a deep understanding of the delay performance. The delay in wireless networks is strongly affected by the traffic arrival process and the packet service process, which in turn depends on the medium access mechanisms and the signal-to-interference-plus-noise ratio (SINR). In this work, we analyze the delay of large wireless networks, where the sources are distributed as a Poisson point process. We provide analytical expressions for the service process and derive delay violation probability bounds using tools from stochastic network calculus and stochastic geometry. Furthermore, we analyze the delay performance under statistical queueing constraints imposed as limitations on buffer violation probabilities. The impact of QoS requirements, network geometry and spatial density of interferers on the throughput and delay performance is identified. Our results provide useful guidelines for resource allocation and system dimensioning to guarantee stringent delay requirements.

National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-146212 (URN)10.23919/WIOPT.2018.8362878 (DOI)000434872700053 ()9783903176003 (ISBN)9781538646212 (ISBN)
Conference
16th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt), May 7 to 11, 2018 in Shanghai, China
Note

Funding agencies: Center for Industrial Information Technology (CENIIT)

Available from: 2018-04-02 Created: 2018-04-02 Last updated: 2018-06-28
Mohapatra, P., Pappas, N., Lee, J., Quek, T. Q. .. & Angelakis, V. (2018). Secure Communications for the Two-user Broadcast Channel with Random Traffic. IEEE Transactions on Information Forensics and Security, 13(9), 2294-2309
Open this publication in new window or tab >>Secure Communications for the Two-user Broadcast Channel with Random Traffic
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2018 (English)In: IEEE Transactions on Information Forensics and Security, ISSN 1556-6013, E-ISSN 1556-6021, Vol. 13, no 9, p. 2294-2309Article in journal (Refereed) Published
Abstract [en]

In this work, we study the stability region of the two-user broadcast channel (BC) with bursty data arrivals and security constraints. It is assumed that one of the receivers has a secrecy constraint, i.e., its packets need to be kept secret from the other receiver, which is defined based on SINR. The receiver with secrecy constraint has full-duplex capability to send a jamming signal for improving its service rate. The stability region of the two-user BC with secrecy constraint is characterized for the general decoding case. Then, assuming two different decoding schemes the respective stability regions are derived. The fullduplex operation of receiver results in self-interference, and the effect of imperfect self-interference cancelation on the stability region is also investigated. The stability region of the BC with a secrecy constraint, where the receivers do not have full duplex capability can be obtained as a special case of the results derived in this paper. In addition, the paper considers the problem of maximizing the saturated throughput of the queue for which there is no secrecy constraint under minimum service guarantees for the other queue. The results provide new insights on the effect of the secrecy constraint on the stability region of the BC. It is found that the stability region with secrecy constraint is sensitive to the degree of self-interference cancelation.

Place, publisher, year, edition, pages
IEEE Signal Processing Society, 2018
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-146030 (URN)10.1109/TIFS.2018.2818076 (DOI)000431896200013 ()
Funder
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile Communications
Note

Funding agencies: National Research Foundation of Korea, Korea Government (MSIP) [2017R1C1B2009280]; DGIST Research and Development Program of the Ministry of Science and ICT [17-ST-02]; DGIST Research and Development Program of the Ministry of Science and ICT under ELLIIT

Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-05-30Bibliographically approved
Tatino, C., Pappas, N., Malanchini, I., Ewe, L. & Yuan, D. (2018). Throughput Analysis for Relay-Assisted Millimeter-Wave Wireless Networks. In: 2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS): . Paper presented at IEEE Global Telecommunications Conference (GC Wkshps), Abu Dhabi, United Arab Emirates, 9-13 Dec. 2018. IEEE
Open this publication in new window or tab >>Throughput Analysis for Relay-Assisted Millimeter-Wave Wireless Networks
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2018 (English)In: 2018 IEEE GLOBECOM WORKSHOPS (GC WKSHPS), IEEE , 2018Conference paper, Published paper (Refereed)
Abstract [en]

In this work, we analyze the throughput of random access multi-user relay-assisted millimeter-wave wireless networks, in which both the destination and the relay have multi-packet reception capability. We consider a full-duplex network cooperative relay that stores the successfully received packets in a queue, for which we analyze the performance. Moreover, we study the effects on the network throughput of two different schemes, by which the source nodes transmit either a packet to both the destination and the relay in the same timeslot by using wider beams (broadcast scheme) or to only one of these two by using narrower beams (fully directional scheme). Numerical results show how the network throughput varies according to specific system parameters, such as positions and number of nodes. The analysis allows us also to understand the optimal transmission scheme for different network scenarios and shows that the choice to use transmissions with narrow beams does not always represent the best strategy, as wider beams provide a lower beamforming gain, but they allow to transmit simultaneously both at the relay and the destination.

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE Globecom Workshops, ISSN 2166-0069
National Category
Communication Systems
Identifiers
urn:nbn:se:liu:diva-156597 (URN)10.1109/GLOCOMW.2018.8644113 (DOI)000462817000030 ()2-s2.0-85063504265 (Scopus ID)978-1-5386-4920-6 (ISBN)
Conference
IEEE Global Telecommunications Conference (GC Wkshps), Abu Dhabi, United Arab Emirates, 9-13 Dec. 2018
Note

Funding Agencies|European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [643002]

Available from: 2019-05-14 Created: 2019-05-14 Last updated: 2019-08-05Bibliographically approved
Pappas, N., Jeon, J., Yuan, D., Traganitis, A. & Ephremides, A. (2018). Wireless Network-Level Partial Relay Cooperation: A Stable Throughput Analysis. Journal of Communications and Networks, 20(1), 93-101
Open this publication in new window or tab >>Wireless Network-Level Partial Relay Cooperation: A Stable Throughput Analysis
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2018 (English)In: Journal of Communications and Networks, ISSN 1229-2370, E-ISSN 1976-5541, Vol. 20, no 1, p. 93-101Article in journal (Refereed) Published
Abstract [en]

In this work, we study the benefit of partial relay cooperation. We consider a two-node system consisting of one source and one relay node transmitting information to a common destination. The source and the relay have external traffic and in addition, the relay is equipped with a flow controller to regulate the incoming traffic from the source node. The cooperation is performed at the network level. A collision channel with erasures is considered. We provide an exact characterization of the stability region of the system and we also prove that the system with partial cooperation is always better or at least equal to the system without the flow controller. 

Keywords
Network level cooperation, partial cooperation, queueing, random access, relay, stability region.
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-145635 (URN)10.1109/JCN.2018.000009 (DOI)000428149300009 ()
Funder
ELLIIT - The Linköping‐Lund Initiative on IT and Mobile CommunicationsEU, Horizon 2020, 645705EU, FP7, Seventh Framework Programme, 612361EU, Horizon 2020, 642743
Note

Funding agencies: People Programme (Marie Curie Actions) of the European Unions Seventh Framework Programme FP7/under REA [[612361]-SOrBet]; EU project DECADE [H2020-MSCA-2014-RISE: 645705]; European Union [642743]; MURI [W911NF-08-1-0238]; NSF [CCF1420651]; ONR [N00014141

Available from: 2018-03-10 Created: 2018-03-10 Last updated: 2018-04-11Bibliographically approved
Kosta, A., Pappas, N. & Angelakis, V. (2017). Age of Information: A New Concept, Metric, and Tool. Boston - Delft: Now Publishers Inc.
Open this publication in new window or tab >>Age of Information: A New Concept, Metric, and Tool
2017 (English)Book (Refereed)
Abstract [en]

In an increasingly networked world in which information is becoming increasingly actual, how can a system know with certainty just how fresh the information on a remote system is? Much work has been done on delay or latency in systems, but only recently has the concept of the freshness of information in or about a system become quantifiable. This is termed the Age of Information.

Age of Information provides a whole new set of metrics and tools that can be used to characterize the freshness of information in communications, control and, indeed, information systems. In its early development, this monograph provides the reader with an easy-to-read tutorial-like introduction into this novel approach of dealing with information within systems. A critical summary of the work to date details the concept for the reader. A description of the fundamentals of the performance metrics is then presented before showing how the approach can be used as a tool in improving metrics in other contexts.

The survey and tutorial nature of this monograph will save any researcher or student considerable time in understanding the basics of Age of Information, which is destined to become an important research topic in networked systems.

Place, publisher, year, edition, pages
Boston - Delft: Now Publishers Inc., 2017. p. 110
Series
Foundations and Trends® in Networking, ISSN 1554-057X, E-ISSN 1554-0588 ; 12(3)
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:liu:diva-149022 (URN)10.1561/1300000060 (DOI)9781680833607 (ISBN)9781680833614 (ISBN)
Available from: 2018-06-25 Created: 2018-06-25 Last updated: 2019-05-09Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4416-7702

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