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  • 1.
    Arvidsson, Åke
    et al.
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Westberg, Lars
    Fast Transport for Edge Computing in 5G Networks2018In: Proceedings of 2018 26th International Conference on Software, Telecommunications and Computer Networks (SoftCOM) / [ed] Dinko Begušić, Nikola Rožić, Joško Radić, and Matko Šarić, New York: IEEE Communications Society, 2018, p. 41-45Conference paper (Refereed)
    Abstract [en]

    We consider TCP performance for cloud servicesin 5G cellular networks and show that edge clouds offer the highest throughput, but that further improvements still arepossible. To this end we devise a concept where edge clouds connected directly to the radio access network can increase their transmission rates by relying on the built in re-transmissions (through quality of service features) and on the built in userfairness (through per-user buffers and scheduler policies). We use numerical examples from measurements in real networks to demonstrate that the concept is efficient and significantly improves the effective throughput beyond what placement alone can do, and we also outline possible further improvements.

  • 2.
    Chen, Eric Zhi
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Some new binary codes with improved minimum distances2018In: Journal of Algebra Combinatorics Discrete Structures and Applications, ISSN 2148-838X, Vol. 5, no 2, p. 65-70Article in journal (Refereed)
    Abstract [en]

    It has been well-known that the class of quasi-cyclic (QC) codes contain many good codes. In thispaper, a method to conduct a computer search for binary 2-generator QC codes is presented, anda large number of good 2-generator QC codes have been obtained. 5 new binary QC codes thatimprove the lower bounds on minimum distance are presented. Furthermore, with new 2-generatorQC codes and Construction X, 2 new improved binary linear codes are obtained. With the standardconstruction techniques, another 16 new binary linear codes that improve the lower bound on theminimum distance have also been obtained.

  • 3.
    Jovanovic, Aleksandar
    et al.
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Vu, Cong
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Triggningskriterier i triggningsmodul för trådlösa dataloggern DL141E2018Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    With the data logger DL141E it’s possible to continuously log measurement data from sensors up to 30k samples per second, and then transferring them to a mobile phone with Bluetooth technology. But this is by far too much sample data in a small time for a mobile phone with technical limitations to receive. That’s why only relevant measurement data should be mass logged to reduce the unnecessary data amount. Int his study a new approach is proposed where a specific and smaller amount of discrete pre-samples are logged in sequence. Every set of pre-samples is processed by comparing them to the user pre-defined trigger criterias. Met criterias will trigger logging of a massive set of samples on basis of only interesting signal deviations. The following trigger criterias are used: a specific signal level to cross, a specific signal direction, and both of these in combination with an amount of consecutive samples. The study provides an examination on how the signal processing method ”Lebesgue sampling” can be applied with the above criterias to achieve a god accuracy with reasonable processing time on mobile phones. This is observed using sensors with the most common signal types ramp and pulse in an environment where small noises and transients occur. The accuracy and the processing load are taken into account when estimating the efficiency of Lebesgue method and when estimating how many pre-samples per set might be sufficient. The implementation is written in Java Android platform and then integrated into a digital triggering module with Graphical User Interface (GUI).

  • 4. Van der Mei, Rob
    et al.
    Van den Berg, Hans
    Ganchev, Ivan
    Tutschku, Kurt
    Leitner, Philipp
    Lassila, Pasi
    Burakowski, Wojciech
    Liberal, Fidel
    Arvidsson, Åke
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap. Peter Key.
    Hoβfeld, Tobias
    Wac, Katarzyna
    Melvin, Hugh
    Galinac Grbac, Tihana
    Yoram, Haddad
    Key, Peter
    State of the art and research challenges in the area of autonomous control for a reliable internet of services2018In: Autonomous control for a reliable internet of services: methods, models, approaches, techniques, algorithms, and tools / [ed] Ivan Ganchev, R. D. van der Mei, Hans van den Berg, Springer Open , 2018, p. 1-22Chapter in book (Other academic)
    Abstract [en]

    The explosive growth of the Internet has fundamentally changed the global society. The emergence of concepts like service-oriented architecture (SOA), Software as a Service (SaaS), Platform as a Service (PaaS), Infrastructure as a Service (IaaS), Network as a Service (NaaS) and Cloud Computing in general has catalyzed the migration from the information-oriented Internet into an Internet of Services (IoS). This has opened up virtually unbounded possibilities for the creation of new and innovative services that facilitate business processes and improve the quality of life. However, this also calls for new approaches to ensuring quality and reliability of these services. The goal of this book chapter is to first analyze the state-of-the-art in the area of autonomous control for a reliable IoS and then to identify the main research challenges within it. A general background and high-level description of the current state of knowledge is presented. Then, for each of the three subareas, namely the autonomous management and real-time control, methods and tools for monitoring and service prediction, and smart pricing and competition in multi-domain systems, a brief general introduction and background are presented, and a list of key research challenges is formulated.

  • 5.
    Wang, Qinghua
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Lightweight Session-Key Establishment for the Internet of Things2018Conference paper (Refereed)
  • 6.
    Wang, Qinghua
    et al.
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Huang, Xin
    England.
    Mengistu, Dawit
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap. dawit.mengistu@hkr.se .
    Session key agreement for end-to-end security in time-synchronized networks2018Conference paper (Refereed)
  • 7.
    Zhou, Xujia
    et al.
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Flora, Eduardo
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Comparison of Performance and Power Consumption Between GPS and Sigfox Positioning Using Pycom Modules2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sigfox is one of the newly-emerging LPWAN (Low Power Wide Area Network) technologies aiming to provide power-efficient solutions to the world of IoT. This study presents a comparison between Sigfox Geolocation and GPS (Global Positioning System) in terms of power consumption and performance which includes three metrics: accuracy and precision, response rate and response time. This study includes for the first part a series of lab tests where Sigfox Geolocation and GPS were studied in a single Sleep, Wake up, Idle, Tx/Rx cycle. For the second part, field tests with different geographical parameters (altitude, population, mobility) were conducted. Results of lab tests show that power consumption difference between Sigfox and GPS is a linear function of Idle time. In field tests, GPS presents a far superior performance than Sigfox in all metrics and marginally better power efficiency for relatively short Idle interval. For both GPS and Sigfox, a correlation between power efficiency and performance was observed. Results show that GPS operates best in rural environments while Sigfox stands out in urban ones. Payload size was observed to affect Sigfox in both power consumption and performance while different transmission rates only affect power consumption but do not seem to impact the other metrics. A solution based on the outcome of this study is suggested for a freight-monitoring system where geolocation is handled by GPS and the coordinates transmitted via Sigfox. As an emerging technology under constant development, Sigfox Geolocation is expected to have improved performance in the near future.

1 - 7 of 7
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