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Fernandez, Z., Val, I., Mendicute, M. & Uhlemann, E. (2019). Analysis and Evaluation of Self-Organizing TDMA for Industrial Applications. In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS: . Paper presented at 15th IEEE International Workshop on Factory Communication Systems, WFCS 2019, 27 May 2019 through 29 May 2019. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Analysis and Evaluation of Self-Organizing TDMA for Industrial Applications
2019 (English)In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper, Published paper (Refereed)
Abstract [en]

With the Industry 4.0 revolution, the inclusion of wireless communications with real-time requirements has been gaining popularity in industrial applications. As existing wireless technologies do not fully satisfy the stringent requirements of the most critical industrial applications, wired, centralized networks are often used. However, when the application requires mobility, there is no other way than to use wireless communications. Further, in applications where the topology changes dynamically and a large number of devices are mobile, centralized protocols are less suitable. Unfortunately, most decentralized medium access protocols are not predictable, and thereby not able to fulfil the real-time requirements. To address these challenges, in this paper Self-Organizing Time Division Multiple Access (STDMA) is analysed to assess its suitability for use in industrial applications. The analysis has been carried out through simulations under a multipath dispersed time-variant industrial channel while subject to a variable Doppler shift. To this end, several metrics such as channel access delay, slot occupation distribution (SOD), packet losses and packet inter-arrival time (PIAT) have been evaluated, using OMNeT++ in combination with the VEINS framework. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Ad-hoc networks, Industrial communications, Real-time communications, Self-Organizing TDMA, Wireless communications, Ad hoc networks, Packet networks, Analysis and evaluation, Centralized protocols, Channel access delays, Medium access protocol, Real-time communication, Stringent requirement, Time division multiple access
National Category
Computer Engineering Communication Systems
Identifiers
urn:nbn:se:mdh:diva-45018 (URN)10.1109/WFCS.2019.8758039 (DOI)2-s2.0-85070072400 (Scopus ID)9781728112688 (ISBN)
Conference
15th IEEE International Workshop on Factory Communication Systems, WFCS 2019, 27 May 2019 through 29 May 2019
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Quach, T., Tran, H. V., Uhlemann, E., Kaddoum, G. & Tran, Q. (2019). Power allocation policy and performance analysis of secure and reliable communication in cognitive radio networks. Wireless networks, 25(4), 1477-1489
Open this publication in new window or tab >>Power allocation policy and performance analysis of secure and reliable communication in cognitive radio networks
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2019 (English)In: Wireless networks, ISSN 1022-0038, E-ISSN 1572-8196, Vol. 25, no 4, p. 1477-1489Article in journal (Refereed) Published
Abstract [en]

This paper investigates the problem of secure and reliable communications for cognitive radio networks. More specifically, we consider a single input multiple output cognitive model where the secondary user (SU) faces an eavesdropping attack while being subject to the normal interference constraint imposed by the primary user (PU). Thus, the SU must have a suitable power allocation policy which does not only satisfy the constraints of the PU but also the security constraints such that it obtains a reasonable performance for the SU, without exposing information to the eavesdropper. We derive four power allocation policies for different scenarios corresponding to whether or not the channel state information of the PU and the eavesdropper are available at the SU. Further, we introduce the concept secure and reliable communication probability (SRCP) as a performance metric to evaluate the considered system, as well as the efficiency of the four power allocation policies. Finally, we present numerical examples to illustrate the power allocation polices, and the impact of these policies on the SRCP of the SU. 

National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-43118 (URN)10.1007/s11276-017-1605-z (DOI)000463885400004 ()2-s2.0-85033487528 (Scopus ID)
Projects
SafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
EU, Horizon 2020, 692529 
Available from: 2019-04-16 Created: 2019-04-16 Last updated: 2019-09-20Bibliographically approved
Hoang, L.-N., Uhlemann, E. & Jonsson, M. (2019). Relay Grouping to Guarantee Timeliness and Reliability in Wireless Networks. IEEE Communications Letters, 23(9), 1661-1664, Article ID 8737952.
Open this publication in new window or tab >>Relay Grouping to Guarantee Timeliness and Reliability in Wireless Networks
2019 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 23, no 9, p. 1661-1664, article id 8737952Article in journal (Refereed) Published
Abstract [en]

Relaying can increase reliability, range, or throughput. In many cyber-physical systems (CPS), relaying is used to maximize reliability before a given deadline. Since concurrent transmissions are not supported by most CPS, time-division multiple access (TDMA) is typically used. However, a major drawback of relaying in TDMA is that pre-allocated time-slots are wasted if their respective transmitters do not have any correctly received packet to relay. Therefore, in this letter, we propose a novel relay grouping scheme to overcome this drawback. Numerical results show that the proposed scheme significantly enhances the reliability while guaranteeing the deadline for each message. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
industrial communication, multi-access communication, Relay networks, Embedded systems, Reliability, Wireless networks, Concurrent transmission, Cyber-physical systems (CPS), Industrial communications, Multi-access communications, Numerical results, Relay network, Time division multiple accesses (TDMA), Timeliness and reliability, Time division multiple access
National Category
Telecommunications Communication Systems Computer Engineering
Identifiers
urn:nbn:se:mdh:diva-45316 (URN)10.1109/LCOMM.2019.2923406 (DOI)000485733200048 ()2-s2.0-85072257501 (Scopus ID)
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-10-03Bibliographically approved
Dao, V.-L., Tran, H. V., Girs, S. & Uhlemann, E. (2019). Reliability and Fairness for CANT Communication Based on Non-Orthogonal Multiple Access. In: 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS): . Paper presented at IEEE International Conference on Communications (ICC), MAY 20-24, 2019, Shanghai, PEOPLES R CHINA. IEEE
Open this publication in new window or tab >>Reliability and Fairness for CANT Communication Based on Non-Orthogonal Multiple Access
2019 (English)In: 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Recently, communication using unmanned aerial vehicles (LAVO as relay nodes has been considered beneficial for a number of applications. Moreover, nomorthogonM multiple access (NONIA) with users being assigned different signal passer levels while sharing the same tune-frequency domain has been found effective to enhance spectrum utilization and provide predictable access to the channel. Thus, in this paper we consider an UAV communication system with NOMA and propose a solution to find the optimal values for the user's power allocation coefficients (PA(s) needed to achieve the required levels of communication reliability. We present a closed-form expression for the PAC of each user and also propose an algori for finding the optimal altitude of the UAV required to satisfy the fairness condition for all users. Finally, we provide numerical mutinies and compare the results tar three types of communication environments.

Place, publisher, year, edition, pages
IEEE, 2019
Series
IEEE International Conference on Communications Workshops, ISSN 2164-7038
National Category
Telecommunications Communication Systems Signal Processing
Identifiers
urn:nbn:se:mdh:diva-45313 (URN)000484917800207 ()978-1-7281-2373-8 (ISBN)
Conference
IEEE International Conference on Communications (ICC), MAY 20-24, 2019, Shanghai, PEOPLES R CHINA
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2019-09-27Bibliographically approved
Dao, V.-L., Tran, H. V., Girs, S. & Uhlemann, E. (2019). Reliability and Fairness for UAV Communication Based on Non-Orthogonal Multiple Access. In: 2019 IEEE International Conference on Communications Workshops (ICC Workshops): . Paper presented at IEEE International Conference on Communications IEEEICC, 20 May 2019, Shanghai, China. (53)
Open this publication in new window or tab >>Reliability and Fairness for UAV Communication Based on Non-Orthogonal Multiple Access
2019 (English)In: 2019 IEEE International Conference on Communications Workshops (ICC Workshops), 2019, no 53Conference paper, Published paper (Refereed)
Abstract [en]

Recently, communication using unmanned aerial vehicles (UAVs) as relay nodes has been considered beneficial for a number of applications. Moreover, non-orthogonal multiple access (NOMA) with users being assigned different signal power levels while sharing the same time-frequency domain has been found effective to enhance spectrum utilization and provide predictable access to the channel. Thus, in this paper we consider an UAV communication system with NOMA and propose a solution to find the optimal values for the user’s power allocation coefficients (PACs) needed to achieve the required levels of communication reliability. We present a closed-form expression for the PAC of each user and also propose an algorithm for finding the optimal altitude of the UAV required to satisfy the fairness condition for all users. Finally, we provide numerical examples and compare the results for three types of communication environments.

National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-45066 (URN)10.1109/ICCW.2019.8757160 (DOI)978-1-7281-2373-8 (ISBN)
Conference
IEEE International Conference on Communications IEEEICC, 20 May 2019, Shanghai, China
Projects
FORA - Fog Computing for Robotics and Industrial Automation
Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-08-22Bibliographically approved
Vo, V. N., Tran, H. V., Uhlemann, E., Truong, Q. X., So-In, C. & Balador, A. (2019). Reliable Communication Performance for Energy Harvesting Wireless Sensor Networks. In: 2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING): . Paper presented at 89th IEEE Vehicular Technology Conference (VTC Spring), APR 28-MAY 01, 2019, Kuala Lumpur, MALAYSIA. IEEE
Open this publication in new window or tab >>Reliable Communication Performance for Energy Harvesting Wireless Sensor Networks
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2019 (English)In: 2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, we study the problem of how to provide reliable communications for energy harvesting (EH) wireless sensor network (WSN). Using the example of an autonomous quarry, where self-driving trucks autonomously collect and transport goods, there is a need for multiple wireless sensors collecting data about where and when goods can be collected, while guaranteeing reliable operation of the quarry. The vehicles transfer energy to the wireless sensors within range, forming a cluster. The sensors use this energy to transmit data to the vehicles. Finally, the vehicles relay information to an access point (AP). The AP processes the collected information and synchronize the operation of all vehicles. We propose an interference channel selection policy for the sensors-to-vehicles links and vehicles-to-AP links to improve the reliability of the communications, while enhancing the energy utilization. Accordingly, closed-form expression on how to achieve reliable communication within the considered system is derived and numerical results show that the proposed channel selection strategy not only improves the probability of achieving sufficiently reliable communication but also enhances the energy utilization.

Place, publisher, year, edition, pages
IEEE, 2019
Series
IEEE Vehicular Technology Conference Proceedings, ISSN 1550-2252
Keywords
Energy Harvesting, Wireless Sensor Networks, Interference Level, Reliable Communication Probability
National Category
Communication Systems
Identifiers
urn:nbn:se:mdh:diva-45266 (URN)000482655600031 ()978-1-7281-1217-6 (ISBN)
Conference
89th IEEE Vehicular Technology Conference (VTC Spring), APR 28-MAY 01, 2019, Kuala Lumpur, MALAYSIA
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved
Uhlemann, E. (2019). Trusting autonomous vehicles [Connected and automated vehicles]. IEEE Vehicular Technology Magazine, 14(2), 121-124, Article ID 8721585.
Open this publication in new window or tab >>Trusting autonomous vehicles [Connected and automated vehicles]
2019 (English)In: IEEE Vehicular Technology Magazine, ISSN 1556-6072, E-ISSN 1556-6080, Vol. 14, no 2, p. 121-124, article id 8721585Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-43883 (URN)10.1109/MVT.2019.2905521 (DOI)000469837900017 ()2-s2.0-85066471029 (Scopus ID)
Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-18Bibliographically approved
Balador, A., Uhlemann, E., Calafate, C. T. & Cano, J.-C. -. (2018). Supporting beacon and event-driven messages in vehicular platoons through token-based strategies. Sensors, 18(4), Article ID 955.
Open this publication in new window or tab >>Supporting beacon and event-driven messages in vehicular platoons through token-based strategies
2018 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, no 4, article id 955Article in journal (Refereed) Published
Abstract [en]

Timely and reliable inter-vehicle communications is a critical requirement to support traffic safety applications, such as vehicle platooning. Furthermore, low-delay communications allow the platoon to react quickly to unexpected events. In this scope, having a predictable and highly effective medium access control (MAC) method is of utmost importance. However, the currently available IEEE 802.11p technology is unable to adequately address these challenges. In this paper, we propose a MAC method especially adapted to platoons, able to transmit beacons within the required time constraints, but with a higher reliability level than IEEE 802.11p, while concurrently enabling efficient dissemination of event-driven messages. The protocol circulates the token within the platoon not in a round-robin fashion, but based on beacon data age, i.e., the time that has passed since the previous collection of status information, thereby automatically offering repeated beacon transmission opportunities for increased reliability. In addition, we propose three different methods for supporting event-driven messages co-existing with beacons. Analysis and simulation results in single and multi-hop scenarios showed that, by providing non-competitive channel access and frequent retransmission opportunities, our protocol can offer beacon delivery within one beacon generation interval while fulfilling the requirements on low-delay dissemination of event-driven messages for traffic safety applications. 

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-38912 (URN)10.3390/s18040955 (DOI)000435574800027 ()29570676 (PubMedID)2-s2.0-85044467893 (Scopus ID)
Projects
SafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
EU, Horizon 2020, 692529 Vinnova
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2019-06-18Bibliographically approved
Uhlemann, E. (2018). The Next Step: Acquisitions and Open Collaboration Platforms. IEEE Vehicular Technology Magazine, 13(2), 14-14
Open this publication in new window or tab >>The Next Step: Acquisitions and Open Collaboration Platforms
2018 (English)In: IEEE Vehicular Technology Magazine, ISSN 1556-6072, E-ISSN 1556-6080, Vol. 13, no 2, p. 14-14Article in journal, Editorial material (Other academic) Published
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-39825 (URN)10.1109/MVT.2018.2813441 (DOI)000433094600004 ()
Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2018-06-14Bibliographically approved
Gutiérrez Peón, P., Uhlemann, E., Steiner, W. & Björkman, M. (2017). Applying Time Diversity for Improved Reliability in a Real-Time Heterogeneous MAC Protocol. In: 2017 IEEE 85TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING): . Paper presented at IEEE 85th Vehicular Technology Conference VTC2017-Spring, 04 Jun 2017, Sydney, Australia. , Article ID 8108663.
Open this publication in new window or tab >>Applying Time Diversity for Improved Reliability in a Real-Time Heterogeneous MAC Protocol
2017 (English)In: 2017 IEEE 85TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING), 2017, article id 8108663Conference paper, Published paper (Refereed)
Abstract [en]

Supporting real-time applications over wireless networks is challenging for several reasons. The medium access control (MAC) layer has a key role in enabling real-time guarantees by providing bounded access time to the transmission medium. Unfortunately, even when timely access is granted, transmissions can still be compromised, specially in the wireless domain, due to the unreliable transmission medium. A common way to increase the reliability of a communication system is to apply redundancy in the form of time diversity, i.e., transmitting several copies of the same message at different points in time. In this paper we propose a wireless MAC protocol capable of handling traffic with different levels of criticality and where transmissions and retransmissions are tailored to deadlines, so that the reliability of the communication system is increased and real-time guarantees can be provided. We focus on the traffic scheduling problem, and extend an already existing solution, Time-Triggered Ethernet, suitable for real-time traffic over wired multi-hop networks. The extension enables transmission of heterogeneous traffic over hybrid wired-wireless networks, and provides timely retransmissions in the wireless segment, such that the real-time guarantees are met. Further, we are able to schedule traffic to better cope with interference patterns of different duration, frequency and level of persistence. The results show that the MAC protocol can be successfully applied to combat different kinds of interference while meeting real-time deadlines.

National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-37002 (URN)10.1109/VTCSpring.2017.8108663 (DOI)000426875802118 ()2-s2.0-85040610511 (Scopus ID)978-1-5090-5932-4 (ISBN)
Conference
IEEE 85th Vehicular Technology Conference VTC2017-Spring, 04 Jun 2017, Sydney, Australia
Projects
RetNet - The European Industrial Doctorate Programme on Future Real-Time NetworksSafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
EU, Horizon 2020, 692529 Vinnova
Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2019-04-23Bibliographically approved
Projects
Reliable Real-Time Communications [2008-03431_Vinnova]; Halmstad University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6497-4099

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