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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
Lisova, E. & Girs, S. (2019). The Challenge of Safety Tactics Synchronization for Cooperative Systems. In: International workshop on Interplay of Security, Safety and System/Software Architecture ISSA-2018: . Paper presented at International workshop on Interplay of Security, Safety and System/Software Architecture ISSA-2018, 06 Sep 2018, Barcelona, Spain (pp. 50-58).
Open this publication in new window or tab >>The Challenge of Safety Tactics Synchronization for Cooperative Systems
2019 (English)In: International workshop on Interplay of Security, Safety and System/Software Architecture ISSA-2018, 2019, p. 50-58Conference paper, Published paper (Refereed)
Abstract [en]

Given rapid progress in integrating operational and industrial technologies and recent increase in the level of automation in safety-related systems, cooperative cyber-physical systems are emerging in a self-contained area requiring new approaches for addressing their critical properties such as safety and security. The notion of tactics is used to describe a relation between a system input and its corresponding response. Cooperative functionalities often rely on wireless communication and incoherent behavior of different wireless channels makes it challenging to achieve harmonization in deployment of systems' tactics. In this work we focus on safety tactics for cooperative cyber-physical systems as a response to inputs related to both safety and security, i.e., we are interested in security informed safety, and formulate a challenge of synchronization of safety tactics between the cooperating systems. To motivate the requirement on such synchronization we consider a car platoon, i.e., a set of cooperative vehicles, as an example and illustrate possible hazards arising from unsynchronized tactics deployment.

Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 11552
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-40894 (URN)10.1007/978-3-030-16874-2_4 (DOI)2-s2.0-85064874474 (Scopus ID)9783030168735 (ISBN)
Conference
International workshop on Interplay of Security, Safety and System/Software Architecture ISSA-2018, 06 Sep 2018, Barcelona, Spain
Projects
Future factories in the CloudSerendipity - Secure and dependable platforms for autonomy
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2019-06-11Bibliographically approved
Hasan, S., Balador, A., Girs, S. & Uhlemann, E. (2019). Towards emergency braking as a fail-safe state in platooning: A simulative approach. In: IEEE Vehicular Technology Conference: . Paper presented at 90th IEEE Vehicular Technology Conference, VTC 2019 Fall, 22 September 2019 through 25 September 2019. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Towards emergency braking as a fail-safe state in platooning: A simulative approach
2019 (English)In: IEEE Vehicular Technology Conference, Institute of Electrical and Electronics Engineers Inc. , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Platooning is anticipated to facilitate automated driving even with semi-automated vehicles, by forming road trains using breadcrumb tracing and Cooperative Adaptive Cruise Control (CACC). With CACC, the vehicles coordinate and adapt their speed based on wireless communications. To keep the platoon fuel-efficient, the inter-vehicle distances need to be quite short, which requires automated emergency braking capabilities. In this paper, we propose synchronized braking, which can be used together with existing CACC controllers. In synchronized braking, the leading vehicle in the platoon does not brake immediately, but instead communicates its intentions and then, slightly later, the whole platoon brakes simultaneously. We show that synchronized braking can avoid rear-end collisions even at a very high deceleration rate and with short inter- vehicle distances. Also, the extra distance travelled during the delay before braking can be compensated by enabling a higher deceleration, through coordinated synchronized braking.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Adaptive cruise control, Automation, Brakes, Synchronization, Vehicles, Automated driving, Automated vehicles, Cooperative adaptive cruise control, Deceleration rate, Leading vehicle, Rear-end collisions, Road trains, Wireless communications, Braking
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-46215 (URN)10.1109/VTCFall.2019.8891254 (DOI)2-s2.0-85075231034 (Scopus ID)9781728112206 (ISBN)
Conference
90th IEEE Vehicular Technology Conference, VTC 2019 Fall, 22 September 2019 through 25 September 2019
Available from: 2019-12-02 Created: 2019-12-02 Last updated: 2019-12-02Bibliographically approved
Girs, S. & Ashjaei, S. M. (2018). Designing a Bandwidth Management Scheme for Heterogeneous Virtualized Networks. In: International Conference on Emerging Technologies and Factory Automation - Work in Progress Session ETFA-WiP'18: . Paper presented at International Conference on Emerging Technologies and Factory Automation - Work in Progress Session ETFA-WiP'18, 04 Sep 2018, Torino, Italy (pp. 1079-1082). , Article ID 8502450.
Open this publication in new window or tab >>Designing a Bandwidth Management Scheme for Heterogeneous Virtualized Networks
2018 (English)In: International Conference on Emerging Technologies and Factory Automation - Work in Progress Session ETFA-WiP'18, 2018, p. 1079-1082, article id 8502450Conference paper, Published paper (Refereed)
Abstract [en]

With envisioned increased density and complexity of future industrial networks, software defined networking (SDN) and network virtualization are considered to be promising techniques for network organization and management. Thus, in this paper we look at heterogeneous software defined networks consisting of several virtual slices and present a bandwidth control algorithm, which is designed to provide control over shared bandwidth both in wired and wireless parts of the network. The designed algorithm has been implemented in real hardware and in this paper we present the initial test results.

National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-40888 (URN)10.1109/ETFA.2018.8502450 (DOI)000449334500139 ()2-s2.0-85057233622 (Scopus ID)9781538671085 (ISBN)
Conference
International Conference on Emerging Technologies and Factory Automation - Work in Progress Session ETFA-WiP'18, 04 Sep 2018, Torino, Italy
Projects
Future factories in the Cloud
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2018-12-27Bibliographically approved
Girs, S., Sljivo, I. & Jaradat, O. (2017). Contract-Based Assurance for Wireless Cooperative Functions of Vehicular Systems. In: IECON 2017 - 43RD ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY: . Paper presented at 43rd Annual Conference of the IEEE Industrial Electronics Society IECON 2017, 30 Oct 2017, Beijing, China (pp. 8391-8396).
Open this publication in new window or tab >>Contract-Based Assurance for Wireless Cooperative Functions of Vehicular Systems
2017 (English)In: IECON 2017 - 43RD ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, 2017, p. 8391-8396Conference paper, Published paper (Refereed)
Abstract [en]

Cooperation of vehicular systems is the stepping stone towards both road and indoor smart transportation systems. It aims at increasing transportation efficiency and safety compared to the stand-alone vehicular systems. The usage of wireless communication as the foundation of such safety-critical cooperation needs to be embraced with all its benefits and flaws compared to the wired communication. The cooperative functions need to be designed to adapt to the varying reliability of the wireless communication channels such that both the stand-alone vehicles as well as the smart transportation system formed by their cooperation are deemed sufficiently safe. In this paper we build upon a contract-based runtime monitoring architecture and propose a methodology for assuring adaptive behaviour of transportation with respect to the wireless communication channel failures. More specifically, we elaborate how safety analysis of the interaction of the wirelessly connected vehicles can be used as the basis for derivation of the adaptive modes and the corresponding contracts. Furthermore, we discuss how such contracts can be used as the basis for assurance of the adaptive wireless cooperation. We illustrate the proposed methodology on a smart transportation system of a factory.

Series
IEEE Industrial Electronics Society, ISSN 1553-572X
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-37330 (URN)10.1109/IECON.2017.8217474 (DOI)000427164808041 ()2-s2.0-85046657321 (Scopus ID)978-1-5386-1127-2 (ISBN)
Conference
43rd Annual Conference of the IEEE Industrial Electronics Society IECON 2017, 30 Oct 2017, Beijing, China
Projects
Future factories in the CloudSafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
EU, Horizon 2020, 692529 Vinnova
Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2020-02-04Bibliographically approved
Girs, S. (2016). Relaying for Industrial Wireless Networks. (Doctoral dissertation). Västerås: Mälardalen University
Open this publication in new window or tab >>Relaying for Industrial Wireless Networks
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interest in wireless technology for industrial applications has increased dramatically over the last few years. Wireless communication can reduce cost and complexity, enable mobility and provide much higher flexibility than its wired counterparts. However, to be considered for use in practice, wireless systems must provide sufficient levels of timeliness and reliability as required by industrial applications, while keeping reasonable levels of complexity as well as interoperability with existing wired networks. Wireless channels, characterized by pathloss, noise, multipath fading and shadowing, imply a particular challenge to fulfill the requirements on timely and reliable communication. To this end, this thesis work proposes and evaluates a number of techniques able to increase the reliability of wireless communication systems without causing excessive or unpredictable delays. In addition, all proposed solutions are implementable on top of commercially available devices, i.e., they require no large alteration of the standard IEEE 802.15.4 and minimal changes to the current infrastructure to be compatible with existing industrial communication systems. First, the characteristics of industrial communication environments are determined. Then, suitable models to approximate them are selected, since the effectiveness of different error control schemes able to increase reliability depends on the type of wireless channel encountered. Next, different possibilities for reliability improvements in wireless industrial networks, while subject to strict timing constraints, are evaluated. Based on this, relaying that has been proven to be beneficial for traditional wireless networks is evaluated for applicability in industrial systems. Finally, several different relaying strategies that are implementable at the link layer on top of existing chipsets are developed and evaluated. Depending on the specific type of industrial application and its corresponding performance metrics, relaying is combined with network coding, forward error control codes, packet aggregation and packet combining techniques – all of which support increased reliability with maintained delay, at reasonable complexity investments. To complete the framework, scheduling schemes tailored to various relaying protocols are also developed.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2016
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 197
National Category
Other Computer and Information Science
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-29859 (URN)978-91-7485-247-9 (ISBN)
Public defence
2016-02-08, Zeta, Mälardalens högskola, Västerås, 13:15 (English)
Opponent
Available from: 2015-12-08 Created: 2015-12-08 Last updated: 2018-01-10Bibliographically approved
Girs, S., Willig, A., Uhlemann, E. & Björkman, M. (2016). Scheduling for source relaying with packet aggregation in industrial wireless networks. IEEE Transactions on Industrial Informatics, 12(5), 1855-1864
Open this publication in new window or tab >>Scheduling for source relaying with packet aggregation in industrial wireless networks
2016 (English)In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 12, no 5, p. 1855-1864Article in journal (Refereed) Published
Abstract [en]

The interest in wireless communication systems for industrial applications has grown significantly over the last years. More flexible, easier to install and maintain, wireless networks present a promising alternative to the currently used wired systems. However, reliability and timeliness requirements at present met by wired networks also need to be fulfilled by wireless solutions. Packet errors introduced when packets travel through wireless channels imply a significant challenge to fulfill these requirements. Relaying has been recognized to improve the reliability in industrial wireless networks without causing additional delay. Furthermore, the recent results have shown that relaying combined with packet aggregation significantly outperforms simple relaying. However, it is not always cost efficient to introduce additional relay nodes into an industrial network and hence, in this paper, we propose using a combination of relaying and packet aggregation at the source nodes. The results show that when relaying and aggregation are used at the source nodes, the transmission schedule plays a crucial role. A schedule adapting to the varying channel conditions improves performance substantially. By carefully choosing which packet to aggregate, even further improvements can be achieved.

National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:mdh:diva-29832 (URN)10.1109/TII.2016.2535393 (DOI)000389219800022 ()2-s2.0-85012054681 (Scopus ID)
Available from: 2015-12-02 Created: 2015-12-02 Last updated: 2019-06-26Bibliographically approved
Girs, S., Uhlemann, E. & Björkman, M. (2015). Adopting FEC and Packet Combining to Increase the Performance of IWSNs Using Relaying. In: International Conference on Computing and Network Communications CoCoNet'15: . Paper presented at International Conference on Computing and Network Communications, CoCoNet 2015; Trivandrum; India; 15 December 2015 through 19 December 2015 (pp. 90-97).
Open this publication in new window or tab >>Adopting FEC and Packet Combining to Increase the Performance of IWSNs Using Relaying
2015 (English)In: International Conference on Computing and Network Communications CoCoNet'15, 2015, p. 90-97Conference paper, Published paper (Refereed)
Abstract [en]

Industrial networks can benefit significantly from introduction of wireless communication. However, wireless systems suffer from much higher packet error rates than wired networks do, making it difficult to obtain sufficient reliability within application deadlines. One promising approach to increase the reliability of wireless communication systems without causing excessive additional delays is to exploit spatial diversity. However, often in industrial networks it is not possible to place the relay nodes optimally. Due to this not even relay nodes located close to the source are able to receive the source packets missing at the destination correctly and consequently they cannot assist by relaying. Therefore, to benefit even further from relaying, additional measures should be taken both to increase the number of the correct packets at the relay nodes and to allow the destination to recover more correct packets. Consequently, the focus of this work is schemes enabling relaying, forward-error-correction (FEC) and packet combining without causing additional delays or complexity such that it is possible to use off the shelf transceivers. The results show that the introduction of FEC and packet combining does improve performance by enabling relay nodes to help more often. However, the exact gain depends on the specific FEC scheme used and, in particular, the size of the preamble and other fields that must be left uncoded, but still be received correctly, to be able to use FEC on the received packet.

National Category
Computer Engineering
Identifiers
urn:nbn:se:mdh:diva-29652 (URN)10.1109/CoCoNet.2015.7411172 (DOI)000376085000013 ()2-s2.0-84964902861 (Scopus ID)9781467373098 (ISBN)
Conference
International Conference on Computing and Network Communications, CoCoNet 2015; Trivandrum; India; 15 December 2015 through 19 December 2015
Projects
READY - Research Environment for Advancing Low Latency InternetWIRE – Wireless Industrial networks with Reliability Enhancements
Available from: 2015-12-03 Created: 2015-11-26 Last updated: 2019-06-26Bibliographically approved
Alderisi, G., Girs, S., Lo Bello, L., Uhlemann, E. & Björkman, M. (2015). Probabilistic Scheduling and Adaptive Relaying for WirelessHART Networks. In: 20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15: . Paper presented at 20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15, 8-11 Sep 2015, Luxemburg, Luxemburg.
Open this publication in new window or tab >>Probabilistic Scheduling and Adaptive Relaying for WirelessHART Networks
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2015 (English)In: 20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15, 2015Conference paper, Published paper (Refereed)
Abstract [en]

This paper deals with a way to probabilistically guarantee reliable packet delivery in WirelessHART based networks suitable for industrial control systems. We propose a new scheduling scheme, called Iterative Probabilistic Scheduling with Adaptive Relaying (IPS-AR), which consists of a static part (IPS) and a dynamic part (AR). IPS takes into account the channel characteristics and exploits relaying to achieve a minimum reliability threshold as requested by the supported industrial application. In the AR part, each relay node decides the packet to be sent based on online assessment of both the number of consecutive errors experienced by previous packets belonging to the same flow, as well as the number of copies of the packet currently available at the other relay nodes. This enables IPS-AR to achieve the desired reliability level while using the available re-sources in terms of time and bandwidth more efficiently.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-29651 (URN)10.1109/ETFA.2015.7301600 (DOI)000378564800201 ()2-s2.0-84952936854 (Scopus ID)9781467379304 (ISBN)
Conference
20th IEEE International Conference on Emerging Technologies and Factory Automation ETFA'15, 8-11 Sep 2015, Luxemburg, Luxemburg
Projects
READY - Research Environment for Advancing Low Latency InternetWIRE – Wireless Industrial networks with Reliability Enhancements
Available from: 2015-12-03 Created: 2015-11-26 Last updated: 2016-07-28Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9589-6986

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