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Hoang Bengtsson, Hoai
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Publications (10 of 19) Show all publications
Englund, C., Chen, L., Ploeg, J., Semsar-Kazerooni, E., Voronov, A., Hoang Bengtsson, H. & Didoff, J. (2016). The Grand Cooperative Driving Challenge 2016: Boosting the Introduction of Cooperative Automated Vehicles. IEEE wireless communications, 23(4), 146-152
Open this publication in new window or tab >>The Grand Cooperative Driving Challenge 2016: Boosting the Introduction of Cooperative Automated Vehicles
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2016 (English)In: IEEE wireless communications, ISSN 1536-1284, E-ISSN 1558-0687, Vol. 23, no 4, p. 146-152Article in journal (Refereed) Published
Abstract [en]

The Grand Cooperative Driving Challenge (GCDC), with the aim to boost the introduction of cooperative automated vehicles by means of wireless communication, is presented. Experiences from the previous edition of GCDC, which was held in Helmond in the Netherlands in 2011, are summarized, and an overview and expectations of the challenges in the 2016 edition are discussed. Two challenge scenarios, cooperative platoon merge and cooperative intersection passing, are specified and presented. One demonstration scenario for emergency vehicles is designed to showcase the benefits of cooperative driving. Communications closely follow the newly published cooperative intelligent transport system standards, while interaction protocols are designed for each of the scenarios. For the purpose of interoperability testing, an interactive testing tool is designed and presented. A general summary of the requirements on teams for participating in the challenge is also presented.

Place, publisher, year, edition, pages
Piscataway: IEEE, 2016
Keywords
road safety, automobiles, intelligent transportation systems, open systems, radiocommunication
National Category
Communication Systems Robotics
Identifiers
urn:nbn:se:hh:diva-32315 (URN)10.1109/MWC.2016.7553038 (DOI)000382775400020 ()2-s2.0-84986209173 (Scopus ID)
Available from: 2016-10-25 Created: 2016-10-25 Last updated: 2018-03-23Bibliographically approved
Svensson, B., Ul-Abdin, Z., Ericsson, P. M., Åhlander, A., Hoang Bengtsson, H., Bengtsson, J., . . . Nordström, T. (2014). A Running Leap for Embedded Signal Processing to Future Parallel Platforms. In: WISE'14: Proceedings of the 2014 ACM International Workshop on Long-Term Industrial Collaboration on Software Engineering. Paper presented at ASE '14 – ACM/IEEE International Conference on Automated Software Engineering, Västerås, Sweden, September 15-19, 2014 (pp. 35-42). New York, NY: Association for Computing Machinery (ACM)
Open this publication in new window or tab >>A Running Leap for Embedded Signal Processing to Future Parallel Platforms
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2014 (English)In: WISE'14: Proceedings of the 2014 ACM International Workshop on Long-Term Industrial Collaboration on Software Engineering, New York, NY: Association for Computing Machinery (ACM), 2014, p. 35-42Conference paper, Published paper (Refereed)
Abstract [en]

This paper highlights the collaboration between industry and academia in research. It describes more than two decades of intensive development and research of new hardware and software platforms to support innovative, high-performance sensor systems with extremely high demands on embedded signal processing capability. The joint research can be seen as the run before a necessary jump to a new kind of computational platform based on parallelism. The collaboration has had several phases, starting with a focus on hardware, then on efficiency, later on software development, and finally on taking the jump and understanding the expected future. In the first part of the paper, these phases and their respective challenges and results are described. Then, in the second part, we reflect upon the motivation for collaboration between company and university, the roles of the partners, the experiences gained and the long-term effects on both sides. Copyright © 2014 ACM.

Place, publisher, year, edition, pages
New York, NY: Association for Computing Machinery (ACM), 2014
Keywords
Industry-academia collaboration, Embedded signal processing, Parallel computing platforms, Software development
National Category
Software Engineering
Identifiers
urn:nbn:se:hh:diva-27296 (URN)10.1145/2647648.2647653 (DOI)2-s2.0-84908651240 (Scopus ID)978-1-4503-3045-9 (ISBN)
Conference
ASE '14 – ACM/IEEE International Conference on Automated Software Engineering, Västerås, Sweden, September 15-19, 2014
Funder
VINNOVAKnowledge FoundationSwedish Foundation for Strategic Research
Available from: 2014-12-16 Created: 2014-12-16 Last updated: 2018-03-22Bibliographically approved
Bengtsson, J. & Hoang Bengtsson, H. (2010). Dynamic Real-time DSP on Manycores. Paper presented at THIRD SWEDISH WORKSHOP ON MULTI-CORE COMPUTING - MCC'10, 18-19 November, 2010, Chalmers Conference Center, Scania Conference Room, Göteborg, Sweden. Gothenburg
Open this publication in new window or tab >>Dynamic Real-time DSP on Manycores
2010 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Gothenburg: , 2010
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-14625 (URN)
Conference
THIRD SWEDISH WORKSHOP ON MULTI-CORE COMPUTING - MCC'10, 18-19 November, 2010, Chalmers Conference Center, Scania Conference Room, Göteborg, Sweden
Available from: 2011-03-23 Created: 2011-03-23 Last updated: 2018-03-23Bibliographically approved
Hoang, H. & Bengtsson, J. (2008). On supporting real-time communication over the IEEE 802.15.4 protocol. In: Proceedings of the international conference on wireless information networks and systems (WinSys 2008). Paper presented at International Conference on Wireless Information Networks and Systems, Oporto, Portugal, jul 26-29, 2008 (pp. 82-87). Setubal: INSTICC Press
Open this publication in new window or tab >>On supporting real-time communication over the IEEE 802.15.4 protocol
2008 (English)In: Proceedings of the international conference on wireless information networks and systems (WinSys 2008), Setubal: INSTICC Press, 2008, p. 82-87Conference paper, Published paper (Refereed)
Abstract [en]

IEEE 802.15.4 is a new enabling technology for low data rate wireless personal networks. This standard was not specifically designed for wireless sensor networks, but it has shown to be a good match with necessary requirements on low data rate, low power consumption and low cost. Unlike the former 802.11 standard, the MAC protocol specified in IEEE 802.15.4 can operate in two different modes: beacon-enabled mode or non-beacon enable mode. In beacon-enabled mode, nodes can exclusively allocate a number of guaranteed time slots, similar to a resource reservation scheme. Hence, the IEEE 802.15.4 MAC protocol have sufficient capabilities for supporting real-time communication. This paper presents the key features of IEEE 802.15.4 which makes it an attractive standard to use for real-time wireless sensor networks. Two real-time protocols extending the IEEE 802.15.4 standard are reviewed. The purpose of this paper is to present the state of the art on real-time support over IEEE 802.15.4 for wireless sensor networks and to discuss the possibilities on improvements on both the standard and the real-time protocols extending the standard.

Place, publisher, year, edition, pages
Setubal: INSTICC Press, 2008
Keywords
QoS, Real-time communication, Wireless network
National Category
Telecommunications
Identifiers
urn:nbn:se:hh:diva-2704 (URN)000258910000016 ()2-s2.0-58049148144 (Scopus ID)2082/3106 (Local ID)978-989-8111-62-3 (ISBN)2082/3106 (Archive number)2082/3106 (OAI)
Conference
International Conference on Wireless Information Networks and Systems, Oporto, Portugal, jul 26-29, 2008
Available from: 2009-07-06 Created: 2009-07-06 Last updated: 2018-03-23Bibliographically approved
Hoang, H. (2007). Enhancing the Performance of Distributed Real-time Systems. (Doctoral dissertation). Göteborg: Chalmers university of technology
Open this publication in new window or tab >>Enhancing the Performance of Distributed Real-time Systems
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Advanced embedded systems can consist of many sensors, actuators and processors that are deployed on one or several boards, while having a demand of interacting with each other and sharing resources. Communication between different components usually has strict timing constraints. There is thus a strong need to provide solutions for time critical communication. This thesis focuses on both the support of real-time services over standard switched Ethernet networks and the improvement of systems' real-time characteristics, such as reducing delay and jitter in processors and on communication links.

Switched Ethernet has been chosen in this work because of its major advantages in industry; it supports higher bit-rates than most other current LAN (Local Area Network) technologies, including field buses, still at a low cost. We propose using a star network topology with a single Ethernet switch. Each node is connected to a separate port of the switch via a full-duplex link, thereby eliminating collisions. A solid real-time communication protocol for switched Ethernet networks is proposed in the thesis, including a real-time layer between the Ethernet layer and the TCP/IP suite. The network has the capability of supporting both real-time and non real-time traffic and assuring adaptation to the surrounding protocol standards.

Most embedded systems work in a dynamic environment, where the precise behavior of the network traffic can usually not be predicted. To support real-time services, we have chosen the Earliest Deadline scheduling algorithm (EDF) because of its optimality, high efficiency and suitability for being used in adaptive schemes. To be able to increase the amount of guaranteed real-time traffic, the notion of Asymmetric Deadline Partitioning Scheme (ADPS) is introduced. ADPS allows distribution of the end-to-end deadline of a message, sent from any source node in the network to any destination node via the switch, into two sub-deadlines, one for each hop according to the load of the physical link that it must traverse.

For the EDF scheduling algorithm, the feasibility test is one of the most important techniques that provides us with information about whether or not the real-time traffic can be guaranteed by the network. With the same computational complexity as the feasibility test, a method has been developed to compute the minimum EDF-feasible deadline for a real-time task. The importance of this method in real-time applications lies in that it can be effectively used to reduce the response times of specific control activities or limit their input-output jitter. To allow more flexibility in the control of delay and jitter in real-time systems, a general approach for reducing task deadlines according to the requirements of individual tasks has been developed. The method allows the user to specify a deadline reduction factor for each task in order to better exploit the available slack according to the tasks' actual requirements.

Place, publisher, year, edition, pages
Göteborg: Chalmers university of technology, 2007. p. 156
Series
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie, ISSN 0346-718X ; 2599
Keywords
Switched Ethernet, Real-Time Communication, EDF scheduling, Reducation of delay and jitter
National Category
Computer Sciences
Identifiers
urn:nbn:se:hh:diva-1986 (URN)2082/2381 (Local ID)978-91-7291-918-1 (ISBN)2082/2381 (Archive number)2082/2381 (OAI)
Public defence
2007-05-14, Wigforssalen, Halmstad, 10:15 (English)
Opponent
Supervisors
Note

Ingår även i serien: Technical report. D / Department of Computer Science and Engineering, Chalmers University of Technology, 1653-1787 ; 28

Available from: 2008-09-29 Created: 2008-09-29 Last updated: 2018-03-23Bibliographically approved
Hoang, H., Buttazzo, G. & Jonsson, M. (2007). Reducing delay and jitter in software control systems. In: . Paper presented at Real-Time in Sweden (RTiS), August 21st - 22nd, 2007, MRTC/PROGRESS research centre at Mälardalen University, Västerås, Sweden.
Open this publication in new window or tab >>Reducing delay and jitter in software control systems
2007 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Software control systems may be subject to high interference caused by concurrency and resource sharing. Reducing delay and jitter in such systems is crucial for guaranteeing high performance and predictability. In this paper, we present a general approach for reducing delay and jitter by acting on task relative deadlines. The method allows the user to specify a deadline reduction factor for each task to better exploit the available slack according to specific jitter sensitivity. Experimental results confirm the effectiveness and the generality of the proposed approach with respect to other methods available in the literature.

Keywords
Software Control Systems, Reducing jitter, Reducing delay
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-2776 (URN)2082/3178 (Local ID)2082/3178 (Archive number)2082/3178 (OAI)
Conference
Real-Time in Sweden (RTiS), August 21st - 22nd, 2007, MRTC/PROGRESS research centre at Mälardalen University, Västerås, Sweden
Available from: 2009-08-14 Created: 2009-08-14 Last updated: 2018-03-23Bibliographically approved
Hoang, H. & Buttazzo, G. (2007). Reducing Delay and Jitter in Software Control Systems. In: Proceedings of the 15th International Conference on Real-Time and Network Systems: RTNS’07. Paper presented at 15th Conference on real-time and networks systems, LORIA, Nancy, France 29-30 March 2007 (pp. 173-182). Vandoeuvre: Institut National Polytechnique de Lorraine
Open this publication in new window or tab >>Reducing Delay and Jitter in Software Control Systems
2007 (English)In: Proceedings of the 15th International Conference on Real-Time and Network Systems: RTNS’07, Vandoeuvre: Institut National Polytechnique de Lorraine , 2007, p. 173-182Conference paper, Published paper (Refereed)
Abstract [en]

Software control systems may be subject to high interference caused by concurrency and resource sharing. Reducing delay and jitter in such systems is crucial for guaranteeing high performance and predictability. In this paper, we present a general approach for reducing delay and jitter by acting on task relative deadlines. The method allows the user to specify a deadline reduction factor for each task to better exploit the available slack according to specific jitter sensitivity. Experimental results confirm the effectiveness and the generality of the proposed approach with respect to other methods available in the literature.

Place, publisher, year, edition, pages
Vandoeuvre: Institut National Polytechnique de Lorraine, 2007
Keywords
Software Control Systems, Reducing jitter, Reducing delay
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-1965 (URN)2082/2360 (Local ID)2-905267-53-4 (ISBN)9782905267535 (ISBN)2082/2360 (Archive number)2082/2360 (OAI)
Conference
15th Conference on real-time and networks systems, LORIA, Nancy, France 29-30 March 2007
Available from: 2008-09-26 Created: 2008-09-26 Last updated: 2018-03-23Bibliographically approved
Hoang, H., Buttazzo, G., Jonsson, M. & Karlsson, S. (2006). Computing the minimum EDF feasible deadline in periodic systems. In: 12th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications, 2006. Proceedings. Paper presented at 12th IEEE Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA 2006), 16-18 August 2006, Sydney, Australia (pp. 125-134). Los Alamitos, Calif.: IEEE Press
Open this publication in new window or tab >>Computing the minimum EDF feasible deadline in periodic systems
2006 (English)In: 12th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications, 2006. Proceedings, Los Alamitos, Calif.: IEEE Press, 2006, p. 125-134Conference paper, Published paper (Refereed)
Abstract [en]

In most real-time applications, deadlines are artifices that need to be enforced to meet different performance requirements. For example, in periodic task sets, jitter requirements can be met by assigning suitable relative deadlines and guaranteeing the feasibility of the schedule. This paper presents a method (called minD) for calculating the minimum EDF-feasible deadline of a real-time task. More precisely, given a set of periodic tasks with hard real-time requirements, which is feasible under EDF, the proposed algorithm allows computing the shortest deadline that can be assigned to an arbitrary task in the set, or to a new incoming task (periodic or aperiodic), still preserving the EDF feasibility of the new task set. The algorithm has a pseudo polynomial complexity and handles arbitrary relative deadlines, which can be less than, equal to, or greater than periods.

Place, publisher, year, edition, pages
Los Alamitos, Calif.: IEEE Press, 2006
Series
IEEE International Conference on Embedded and Real-Time Computing Systems and Applications, ISSN 1533-2306 ; 2006
Keywords
Real-time, Scheduling
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:hh:diva-372 (URN)10.1109/RTCSA.2006.22 (DOI)000240851900019 ()2-s2.0-34547275304 (Scopus ID)2082/696 (Local ID)0-7695-2676-4 (ISBN)2082/696 (Archive number)2082/696 (OAI)
Conference
12th IEEE Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA 2006), 16-18 August 2006, Sydney, Australia
Note

©2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Available from: 2007-01-05 Created: 2007-01-05 Last updated: 2018-03-23Bibliographically approved
Hoang, H. & Jonsson, M. (2006). Real-time communication for industrial embedded systems using switched Ethernet. In: Hans Hansson (Ed.), ARTES - A network for Real-Time research and graduate Education in Sweden 1997-2006 (pp. 417-427). Uppsala: Uppsala universitet
Open this publication in new window or tab >>Real-time communication for industrial embedded systems using switched Ethernet
2006 (English)In: ARTES - A network for Real-Time research and graduate Education in Sweden 1997-2006 / [ed] Hans Hansson, Uppsala: Uppsala universitet, 2006, p. 417-427Chapter in book (Refereed)
Abstract [en]

This paper focuses on developing and analyzing support for real-time traffic over a switched Ethernet network without any hardware or protocol modifi- cations. Network architecture with full-duplex switched Ethernet and endnodes has been assumed. The switch and the end nodes control the real-time traffic with Earliest Deadline First (EDF) scheduling on the frame level. No modification to the Ethernet standard is needed in the network that supports both real-time and non-real -time TCP/IP communication. The switch is responsible for admission control where feasibility analysis is made for each link between source and destination. All added traffic handling to support real-time communication is positioned in a thin layer (RT layer) added between the Ethernet layer and the TCP/IP suite. This assures adaptation to the surrounding protocol standards. The RT layer manages traffic on the basis of virtual connections, denoted as RT channels, as well as packet level scheduling. RT channels are created between end-nodes prior to any occurrence of real-time traffic. The comparison of two deadline-partitioning schemes, to partition the delay budget over the links for a path, is also presented. While SDPS (Symmetric Deadline Partitioning Scheme) is straightforward to implement, ADPS (Asymmetric Deadline Partitioning Scheme) is devised in order to have a more flexiblefeasibilitytest. ADPSshows promises in removing bottlenecks from links, especially when a master-slave communication is considered as the traffic pattern, and ADPS proves to be a better choice than SDPS.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2006
Series
Technical report, ISSN 1404-3203
Keywords
Internet, Embedded systems, Local area networks, Processor scheduling, Switching networks, Transport protocols
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-2059 (URN)2082/2454 (Local ID)91-506-1859-8 (ISBN)2082/2454 (Archive number)2082/2454 (OAI)
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2018-03-23Bibliographically approved
Böhm, A., Jonsson, M., Kunert, K. & Hoang, H. (2005). A Fibre-Optic AWG-Based Real-Time Network and Its Applicability to High-Performance Embedded Computing. In: 19th International Parallel and Distributed Processing Symposium: proceedings. Paper presented at 19th IEEE International Conference on Parallel and Distributed Processing Symposium (IPDPS'05), Denver, CO, USA, April 4-5, 2005 (pp. 133b-133b). Piscataway, N.J.: IEEE Press, Article ID 1419972.
Open this publication in new window or tab >>A Fibre-Optic AWG-Based Real-Time Network and Its Applicability to High-Performance Embedded Computing
2005 (English)In: 19th International Parallel and Distributed Processing Symposium: proceedings, Piscataway, N.J.: IEEE Press, 2005, p. 133b-133b, article id 1419972Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, an architecture and a Medium Access Control (MAC) protocol for a multi-wavelength optical communication network, applicable in short range communication systems like System Area Networks (SANs), are proposed. The main focus lies on guaranteed support for hard and soft real-time traffic. The network is based upon a single-hop star topology with an Arrayed Waveguide Grating (AWG) at its center. Traffic scheduling is centralized in one node (residing together with the AWG in a hub), which communicates through a physical control channel. The AWG's property of spatial wavelength reuse and the combination of fixed-tuned and tunable transceivers in the nodes enable simultaneous control and data transmission. A case study with defined real-time communication requirements in the field of Radar Signal Processing (RSP) was carried out and indicates that the proposed system is very suitable for this kind of application.

Place, publisher, year, edition, pages
Piscataway, N.J.: IEEE Press, 2005
Keywords
access protocols, arrayed waveguide gratings, local area networks, optical fibre communication, processor scheduling, radar signal processing, real-time systems, telecommunication network topology, telecommunication traffic, transceivers
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-383 (URN)10.1109/IPDPS.2005.22 (DOI)2-s2.0-33746298717 (Scopus ID)2082/707 (Local ID)0-7695-2312-9 (ISBN)2082/707 (Archive number)2082/707 (OAI)
Conference
19th IEEE International Conference on Parallel and Distributed Processing Symposium (IPDPS'05), Denver, CO, USA, April 4-5, 2005
Note

©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

Available from: 2007-01-11 Created: 2007-01-11 Last updated: 2018-03-23Bibliographically approved

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