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  • 1.
    Ahlgren, Bengt
    et al.
    SICS.
    Björkman, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    The applicability of integrated layer processing1998In: IEEE Journal on Selected Areas in Communications, ISSN 0733-8716, E-ISSN 1558-0008, Vol. 16, no 3, p. 317-331Article in journal (Refereed)
    Abstract [en]

    In this paper, we review previous work on the applicability and performance of integrated layer processing (ILP). ILP has been shown to clearly improve computer communication performance when integrating simple data manipulation functions, but the situati

  • 2.
    Ahlgren, Bengt
    et al.
    SICS .
    Björkman, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Towards predictable ILP performance controlling communication buffer cache effects1996In: Australian Computer Journal, ISSN 0004-8917, Vol. 28, no 2, p. 66-71Article in journal (Refereed)
    Abstract [en]

    Cache memory behaviour is becoming more and more important as the speed of CPUs is increasing faster than the speed of memories. The operation of caches are statistical which means that the system level performance becomes unpredictable. In this paper we

  • 3.
    Ahlgren, Bengt
    et al.
    SICS.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Moldeklev, Kjersti
    Telenor Research.
    Increasing communication performance with a minimal-copy data path supporting ILP and ALF1996In: Journal of High Speed Networks, ISSN 0926-6801, E-ISSN 1875-8940, Vol. 5, no 2, p. 203-214Article in journal (Refereed)
    Abstract [en]

    Many current implementations of communication subsystems on workstation class computers transfer communication data to and from primary memory several times. This is due to software copying between user and operating system address spaces, presentation la

  • 4.
    Ahlén, Anders
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Ahlgren, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Grönroos, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Katardjiev, Ilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signals and Systems Group.
    Presentation of the VINN Excellence Center for Wireless Sensor Networks (WISENET)2008In: Conference on Radio Science (RVK08), Växjö, 2008Conference paper (Refereed)
  • 5.
    Ardon, Sebastien
    et al.
    UNSW, Sydney.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Landfeldt, Björn
    Ericsson Research AB.
    Ismailov, Yuri
    Ericsson Research AB.
    Portmann, Marius
    UNSW, Sydney.
    Seneviratne, Aruna
    UNSW, Sydney.
    Mobile Aware Server Architecture: A distributed proxy architecture for content adaptation2001In: INET 2001 Proceedings, 2001Conference paper (Other (popular science, discussion, etc.))
  • 6.
    Bastani, Saeed
    et al.
    The University of Sydney.
    Landfeldt, Björn
    Lund University.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A social node model for realising information dissemination strategies in delay tolerant networks2012In: Proceedings of the 15th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems, New york: ACM Press, 2012, p. 79-88Conference paper (Refereed)
    Abstract [en]

    In Delay Tolerant Networks (DTNs) as an emerging content dissemination platform, mobile nodes opportunistically exchange content as they meet, with the intent of disseminating content among nodes that share common interests. During a meeting, nodes can exchange both content of direct interest to themselves as well as content that is of interest to a larger set of nodes that may be encountered in the future. The utility of DTN is governed by the content exchange opportunity (the amount of content that can be exchanged during a meeting) as well as the selection of content to be exchanged in order to maximise the interest nodes will have in information they are exposed to. Considering that there is a cost associated with the content exchange (e.g. battery usage, buffer occupancy or consumed transmission opportunity) the aim for nodes participating in content dissemination should be to maximise their payoff. In this paper, we contribute a generic framework for describing the characteristics of content exchange among participating nodes in a network. We incorporate a distributed information popularity measurement and the pairwise interaction of nodes modelled as a bargaining problem. The outcome of this process is the fair split up of dwelling time as a network resource and the selection of which content objects to exchange in order to maximise the nodes’ payoff. The framework is generally intended to be used as a capstone for investigation of content dissemination properties and various content exchange strategies in a DTN, a topic addressed in this paper and experiments conducted to validate the function and correctness of the proposed framework. 

  • 7.
    Bavier, Andy
    et al.
    Princeton University.
    Voigt, Thiemo
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Wawrzoniak, Mike
    Princeton University.
    Peterson, Larry
    Princeton University.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    SILK: Scout Paths in the Linux Kernel2001Report (Other academic)
  • 8.
    Bjurefors, Fredrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Nordström, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Interest dissemination in a searchable data-centric opportunistic network2010In: Proc. European Wireless Conference: EW 2010, Piscataway, NJ: IEEE , 2010, p. 889-895Conference paper (Other academic)
  • 9.
    Bjurefors, Fredrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Haggle Testbed: a Testbed for Opportunistic Networks2011In: In Proceedings of the 7th Swedish National Computer Networking Workshop, 2011Conference paper (Refereed)
  • 10.
    Bjurefors, Fredrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Tavakoli, Sam
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Congestion Avoidance in a Data-Centric Opportunistic Network2011In: Proceedings of the 2011 ACM SIGCOMM Workshop on Information-Centric Networking (ICN-2011), 2011Conference paper (Refereed)
  • 11.
    Bjurefors, Fredrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Karaliopoulos, Markourios
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Smith, Paul
    Theodoropoulos, George
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Resilience and Opportunistic Forwarding: Beyond Average Value Analysis2014In: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 48, no SI, p. 111-120Article in journal (Refereed)
    Abstract [en]

    Opportunistic networks are systems with highly distributed operation, relying on the altruistic cooperation of highly heterogeneous, and not always software and hardware-compatible, user nodes. Moreover, the absence of central coordination and control makes them vulnerable to malicious attacks. In this paper, we study the resilience of popular forwarding protocols to a representative set of challenges to their normal operation. These include jamming locally disturbing message transfer between nodes, hardware/software failures and incompatibility among nodes rendering contact opportunities useless, and free-riding phenomena. We first formulate and promote the metric envelope concept as a tool for assessing the resilience of opportunistic forwarding schemes. Metric envelopes depart from the standard practice of average value analysis and explicitly account for the differentiated challenge impact due to node heterogeneity (device capabilities, mobility) and attackers’ intelligence. We then propose heuristics to generate worst- and best-case challenge realization scenarios and approximate the lower and upper bounds of the metric envelopes. Finally, we demonstrate the methodology in assessing the resilience of three popular forwarding protocols in the presence of the three challenges, and under a comprehensive range of mobility patterns. The metric envelope approach provides better insights into the level of protection path diversity and message replication provide against different challenges, and enables more informed choices in opportunistic forwarding when network resilience becomes important.

  • 12.
    Bjurefors, Fredrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Karaliopoulos, Merkourios
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Smith, Paul
    Theodoropoulos, George
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Resilience and Opportunistic Forwarding: Beyond Average Value Analysis2013In: CHANTS '13 Proceedings of the 8th ACM MobiCom workshop on Challenged networks, 2013Conference paper (Refereed)
    Abstract [en]

    Opportunistic networks are systems with highly distributed operation, relying on the altruistic cooperation of heterogeneous, and not always software- and hardware-compatible user nodes. Moreover, the absence of central control makes them vulnerable to malicious attacks. In this paper, we take a fresh look at the resilience of opportunistic forwarding to these challenges. In particular, we introduce and promote the use of metric envelopes as a resilience assessment tool. Metric envelopes depart from the standard practice of average value analysis and explicitly account for the differentiated impact that a challenge may have on the forwarding performance due to node heterogeneity (device capabilities, mobility) and attackers’ intelligence. The use of metric envelopes is demonstrated in the case of three challenges: jamming, hardware/software failures and incompatibilities, and free-riding phenomena. For each challenge, we first devise heuristics to generate worst- and best-case realization scenarios that can approximate the metric envelopes. Then we derive the envelopes of common performance metrics for three popular forwarding protocols under a comprehensive range of mobility patterns. The metric envelope approach enables more informed choices in opportunistic forwarding whenever network resilience considerations become important. 

  • 13.
    Björkman, Mats
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Performance modeling of multiprocessor implementations of protocols1998In: IEEE/ACM Transactions on Networking, ISSN 1063-6692, E-ISSN 1558-2566, Vol. 6, no 3, p. 262-273Article in journal (Refereed)
    Abstract [en]

    Two major performance bottlenecks in multiprocessor execution of protocols are contention for shared memory and for locks. Locks are used to protect shared messages and/or shared protocol state in a memory shared by competing processors. Mutual exclusion

  • 14.
    Crowcroft, Jon
    et al.
    Cambridge University.
    Fry, Michael
    UTS.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Huitema, Christian
    INRIA.
    HIPPARCH proposal for project. Reactive Long Term Research1994Other (Other (popular science, discussion, etc.))
  • 15.
    Feeney, Laura Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ahlgren, Bengt
    SICS.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Enabling limited traffic scheduling in asynchronous ad hoc networks2005In: 3rd Swedish National Computer Networking Workshop (SNCNW 2005), 2005Conference paper (Other academic)
    Abstract [en]

    We present work-in-progress developing a communication framework that addresses the communication challenges of the decentralized multihop wireless environment. The main contribution is the combination of a fully distributed, asynchronous power save mechanism with adaptation of the timing patterns defined by the power save mechanism to improve the energy and bandwidth efficiency of communication in multihop wireless networks. The possibility of leveraging this strategy to provide more complex forms of traffic management is explored.

  • 16.
    Feeney, Laura Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Avoiding an IoT  "Tragedy of the Commons"2018In: Proc. 16th International Conference on Mobile Systems, Applications, and Services, New York: ACM Press, 2018, p. 495-497Conference paper (Refereed)
  • 17.
    Feeney, Laura Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Hartung, Robert
    Technische Universitaet Braunschweig.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Kulau, Ulf
    Technische Universitaet Braunschweig.
    Wolf, Lars
    Technische Universitaet Braunschweig.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Towards realistic lifetime estimation in battery-powered IoT devices2017Conference paper (Refereed)
    Abstract [en]

    We describe a testbed for studying battery discharge behavior andthe lifetime of wireless devices under controlled temperature conditions and present preliminary measurement results.

  • 18.
    Feeney, Laura Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Making batteries a first class element in the design and evaluation of embedded wireless systems2017In: Proc. 14th International Conference on Embedded Wireless Systems and Networks, ACM Digital Library, 2017, p. 242-243Conference paper (Refereed)
  • 19.
    Feeney, Laura Marie
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Lindgren, Anders
    Andersson, Lars
    How do the dynamics of battery discharge affect sensor lifetime?2014In: 2014 11th Annual Conference on Wireless On-demand Network Systems and Services (WONS), Piscataway, NJ: IEEE , 2014, p. 49-56Conference paper (Refereed)
  • 20. Folke, Mia
    et al.
    Hermans, Frederik
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rodhe, Ioana
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Björkman, Mats
    Lindén, Maria
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Mobile system for establishing the lactate threshold by analysing the respiratory air2011In: Proc. 2nd International Conference on Ambulatory Monitoring of Physical Activity and Movement, Scotland: Glasgow Caledonian University , 2011, p. 102-102Conference paper (Refereed)
  • 21.
    Gold, Richard
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Tschudin, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A virtualized link layer with support for indirection2004In: ACM SIGCOMM Workshop on Future Directions in Network Architecture (FDNA'04) / [ed] Keshav, Fall, Portland: ACM New York, NY, USA , 2004, p. 28-34Conference paper (Refereed)
    Abstract [en]

    The current Internet today hosts several extensions for indirection like Mobile IP, NAT, proxies, route selection and various network overlays. At the same time, user-controlled indirection mechanisms foreseen in the Internet architecture (e.g., loose source routing) cannot be used to implement these extensions. This is a consequence of the Internet's indirection semantics not being rich enough at some places and too rich at others. In order to achieve a more uniform handling of indirection we propose SelNet, a network architecture that is based on a virtualized link layer with explicit indirection support. Indirection in this context refers to user-controlled steering of packet flows through the network. We discuss the architectural implications of such a scheme and report on implementation progress.

  • 22.
    Gold, Richard
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Tschudin, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A Virtualized Link Layer with Support for Indirection2004In: ACM SIGCOMM Workshop on Future Directions in Network Architecture (FDNA'04), 2004Conference paper (Refereed)
    Abstract [en]

    The current Internet today hosts several extensions for indirection like Mobile IP, NAT, proxies, route selection and various network overlays. At the same time, user-controlled indirection mechanisms foreseen in the Internet architecture (e.g., loose source routing) cannot be used to implement these extensions. This is a consequence of the Internet’s indirection semantics not being rich enough at some places and too rich at others. In order to achieve a more uniform handling of indirection we propose SelNet, a network architecture that is based on a virtualized link layer with explicit indirection support. Indirection in this context refers to user-controlled steering of packet flows through the network. We discuss the architectural implications of such a scheme and report on implementation progress.

  • 23.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Beyond adhoc networking. Selfconfiguring Networks and Terminal2003In: The first COST-IST(EU)NSF(USA) Workshop on Exchanges and Trends in Networking, 2003Conference paper (Other academic)
  • 24.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Datakommunikation2000In: Professorsinstallation 2000, Uppsala Universitet , 2000Chapter in book (Other (popular science, discussion, etc.))
  • 25.
    Gunningberg, Per
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Grönroos, Roland
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    Katardjiev, Ilia
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electronics.
    Voigt, Thiemo
    SICS.
    Ahlén, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    Hjort, Klas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
    WISENET Wireless Sensor Networks VINN Excellence Center2007Other (Other academic)
    Abstract [en]

    This broschure was produced for the inauguration of WISENET December 7, 2007. It decribes the future impact of WISENET, application areas and the 10 partners. The three research areas "Node Integration & Energy", "Networkning & Security" and "Wireless Communication" is briefly described as well as the application projects in "Water Sensing" and "Transport".

  • 26.
    Gunningberg, Per
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Hansson, Mattias
    OptiMobile AB.
    Hedqvist, Pekka
    OptiMobile AB.
    Kodu, Jonne
    OptiMobile AB.
    Köhler, Esbjörn
    OptiMobile AB.
    Handover for a portable communication device between local and wide area wireless networks2010Patent (Other (popular scientific, debate etc.))
  • 27.
    Hedqvist, Pekka
    et al.
    OptiMobile AB.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Architecture and Computer Communication.
    Hansson, Mattias
    OptiMobile AB.
    Köhler, Esbjörn
    OptiMobile AB.
    Kodu, Jonne
    OptiMobile AB.
    Handover for a portable communication device between local and wide area wireless networks2015Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    The present invention relates to a method, call handling server (18), local wireless network (10) and computer program product for performing vertical handover of a wireless voice connection, which is a part of a voice connection set up between a portable communication (22) device and another device. The network comprises a number of access points (20) and the call handling server (18) for controlling voice connections to the portable device. The server comprises a control unit (24) that determines a handover situation for the wireless connection to the portable device based on a set of handover factors that comprise the position and movement of the portable communication device in an area of the local network and structural layout information of the area together with knowledge of where in this area there is insufficient coverage.

  • 28.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    McNamara, Liam
    Swedish Institute of Computer Science.
    Voigt, Thiemo
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ngai, Edith
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Supporting Heterogeneous LCD/Camera Links2014In: Proc. 13th International Symposium on Information Processing in Sensor Networks, Piscataway, NJ: IEEE Press, 2014, p. 289-290Conference paper (Refereed)
  • 29.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ngai, Edith C.-H.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Mobile Sources in an Information-Centric Network with Hierarchical Names: An Indirection Approach2011In: Proc. 7th Swedish National Computer Networking Workshop, 2011Conference paper (Refereed)
  • 30.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ngai, Edith
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Global Source Mobility in the Content-Centric Networking Architecture2012In: Proc. 1st ACM Workshop on Emerging Name-Oriented Mobile Networking Design: Architecture, Algorithms, and Applications, New York: ACM Press, 2012, p. 13-18Conference paper (Refereed)
  • 31.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rensfelt, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Larzon, Lars-Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ngai, Edith
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Sensei-UU — a relocatable WSN testbed supporting repeatable node mobility2011In: Testbeds and Research Infrastructures: Development of Networks and Communities, Berlin: Springer-Verlag , 2011, p. 612-614Conference paper (Refereed)
  • 32.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rensfelt, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Larzon, Lars-Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A Lightweight Approach to Online Detection and Classification of Interference in 802.15.4-based Sensor Networks2012In: ACM SIGBED Review, ISSN 1551-3688, Vol. 9, no 3, p. 11-20Article in journal (Refereed)
    Abstract [en]

    With a rapidly increasing number of devices sharing access to the 2.4 GHz ISM band, interference becomes a serious problem for 802.15.4-based, low-power sensor networks. Consequently, interference mitigation strategies are becoming commonplace. In this paper, we consider the step that precedes interference mitigation: interference detection. We have performed extensive measurements to characterize how different types of interferers affect individual 802.15.4 packets. From these measurements, we define a set of features which we use to train a neural network to classify the source of interference of a corrupted packet. Our approach is sufficiently lightweight for online use in a resource constrained sensor network. It does not require additional hardware, nor does it use active spectrum sensing or probing packets. Instead, all information about interferers is gathered from inspecting corrupted packets that are received during the sensor network’s regular operation. Even without considering a history of earlier packets, our approach reaches a mean classification accuracy of 79.8%, with per interferer accuracies of64.9% for WiFi, 82.6% for Bluetooth, 72.1% for microwave ovens, and 99.6% for packets that are corrupted due to insufficient signal strength.

  • 33.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rensfelt, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Voigt, Thiemo
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ngai, Edith
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Nordén, Lars-Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    SoNIC: Classifying interference in 802.15.4 sensor networks2013In: Proc. 12th International Conference on Information Processing in Sensor Networks, New York: ACM Press, 2013, p. 55-66Conference paper (Refereed)
  • 34.
    Hermans, Frederik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Wennerström, Hjalmar
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    McNamara, Liam
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    All is not lost: Understanding and exploiting packet corruption in outdoor sensor networks2014In: Wireless Sensor Networks: EWSN 2014, Springer Berlin/Heidelberg, 2014, p. 116-132Conference paper (Refereed)
  • 35.
    Homewood, Thomas
    et al.
    Swedish Institute of Computer Science.
    Norström, Christer
    Swedish Institute of Computer Science.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Skitracker: Measuring skiing performance using a body-area network2013In: Proc. 12th International Conference on Information Processing in Sensor Networks, New York: ACM Press, 2013, p. 319-320Conference paper (Refereed)
  • 36.
    Hossmann, Theus
    et al.
    ETH Zürich.
    Carta, Paolo
    ETH Zürich.
    Schatzmann, Dominik
    ETH Zürich.
    Legendre, Franck
    ETH Zürich.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Twitter in Disaster Mode: Security Architecture2011In: Conference on emerging Networking EXperiments and Technologies (CoNEXT): Special Workshop on the Internet and Disasters (SWID), Tokyo: ACM Press, 2011Conference paper (Refereed)
    Abstract [en]

    Recent natural disasters (earthquakes, floods, etc.) have shown that people heavily use platforms like Twitter to communicate and organize in emergencies. However, the fixed infrastructure supporting such communications may be temporarily wiped out. In such situations, the phones’ capabilities of infrastructure-less communication can fill in: By propagating data opportunistically (from phone to phone), tweets can still be spread, yet at the cost of delays.

    In this paper, we present Twimight and its network security extensions. Twimight is an open source Twitter client for Android phones featured with a “disaster mode”, which users enable upon losing connectivity. In the disaster mode, tweets are not sent to the Twitter server but stored on the phone, carried around as people move, and forwarded via Bluetooth when in proximity with other phones. However, switching from an online centralized application to a dis- tributed and delay-tolerant service relying on opportunistic communication requires rethinking the security architecture. We propose security extensions to offer comparable security in the disaster mode as in the normal mode to protect Twimight from basic attacks. We also propose a simple, yet efficient, anti-spam scheme to avoid users from being flooded with spam. Finally, we present a preliminary empirical performance evaluation of Twimight. 

  • 37.
    Hossmann, Theus
    et al.
    ETH Zürich.
    Legendre, Franck
    ETH Zürich.
    Carta, Paolo
    ETH Zürich.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Rohner, Christian
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Twitter in Disaster Mode: Opportunistic Communication and Distribution of Sensor Data in Emergencies2011In: ExtremeCom2011, ACM Press, 2011Conference paper (Refereed)
    Abstract [en]

    Recent events (earthquakes, floods, etc.) have shown that users heavily rely on online social networks (OSN) to communicate and organize during disasters and in their aftermath. In this paper, we discuss what features could be added to OSN apps for smart phones – for the example of Twitter – to make them even more useful for disaster situations. In particular, we consider cases where the fixed communication infrastructure is partially or totally wiped out and propose to equip regular Twitter apps with a disaster mode. The disaster mode relies on opportunistic communication and epidemic spreading of Tweets from phone to phone. Such “disaster-ready” applications would allow to resume (although limited) communication instantaneously and help distressed people to self-organize un- til regular communication networks are functioning again, or, temporary emergency communication infrastructure is installed.

    We argue why we believe that Twitter with its simplicity and versatile features (e.g., retweet and hashtag) is a good platform to support a variety of different situations and present Twimight, our disaster ready Twitter application. In addition, we propose Twimight as a platform for disseminating sensor data providing information such as locations of drinkable water sources. Eventually, we propose to rely on interest matching to scale Twitter hashtag-based searches in an opportunistic environment. The combination of these features make our opportunistic Twitter the ideal emergency kit in situations of disasters. We discuss and define the main implementation and research challenges (both technical and non- technical). 

  • 38.
    Landfeldt, Björn
    et al.
    Ericsson Research AB.
    Portmann, Marius
    University of New South Wales.
    Seneviratne, Aruna
    University of New South Wales.
    Ardon, Sebastien
    University of New South Wales.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Accessing distributed proxy configurations2002Patent (Other (popular scientific, debate etc.))
  • 39.
    Landfeldt, Björn
    et al.
    Ericsson Research AB.
    Seneviratne, Aruna
    University of New South Wales.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Ardon, Sebastien
    University of New South Wales.
    Portmann, Marius
    University of New South Wales.
    Creating distributed proxy configurations2002Patent (Other (popular scientific, debate etc.))
  • 40.
    Lawson, Harold
    et al.
    Lawson AB.
    Strömgren, Mikael
    SICS.
    Lundquist, T.
    Arctic Software AB.
    Lundbäck, K.
    Arctic Software AB.
    Johansson, L.
    Chalmers.
    Torin, Jan
    Chalmers.
    Gunningberg, Per
    SICS.
    Hansson, Hans
    Mälardalens Högskola.
    Basement: A Distributed Real-Time Architecture For Safety Critical Applications2000In: SNART Workshop, 2000Conference paper (Other (popular science, discussion, etc.))
  • 41.
    Melander, Bob
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Björkman, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    First-Come-First-Served Packet Dispersion and Implications for2002Conference paper (Refereed)
  • 42.
    Melander, Bob
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Björkman, Mats
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Regression-Based Available Bandwidth Measurements2002In: Proc of the 2002 International Symposium on Performance Evaluation of Computer and Telecommunications, 2002Conference paper (Refereed)
  • 43.
    Moldeklev, Kjersti
    et al.
    Telenor Research.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    How a large ATM MTU causes deadlocks in TCP data transfers1995In: IEEE-ACM transactions on networking, ISSN 1063-6692, Vol. 3, no 4, p. 409-422Article in journal (Refereed)
    Abstract [en]

    The implementation of protocols, such as TCP/IP, and their integration into the operating system environment is crucial for protocol performance, Putting TCP on high-speed networks, e.g., ATM, with large maximum transmission units causes the TCP maximum s

  • 44.
    Ngai, Edith C.-H.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Quality-of-Information aware data collection for mobile sensor networks2012In: Proc. 10th International Conference on Pervasive Computing and Communications Workshops, IEEE Communications Society, 2012, p. 38-43Conference paper (Refereed)
  • 45.
    Ngai, Edith C.-H.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Quality-of-information-aware data collection for mobile sensor networks2014In: Pervasive and Mobile Computing, ISSN 1574-1192, E-ISSN 1873-1589, Vol. 11, p. 203-215Article in journal (Refereed)
    Abstract [en]

    Quality of information (QoI) in sensor networks measures information attributes such as precision, timeliness, completeness, and relevance of data ultimately delivered to users. It is a challenge to provide the required QoI in mobile sensor networks given the large scale and complexity of the networks with heterogeneous mobile and sensing devices. In this paper, we provide a comprehensive study on major QoI metrics for mobile sensor networks and discuss how QoI-aware data collection can be achieved. The cases with mobile sensors, mobile sinks, and mobile mules carrying data and their impact on QoI are discussed in detail. Mobility creates challenges in terms of timeliness but also opportunities in increased coverage and relevance. In a case study, we design a QoI-aware publish/subscribe system for mobile sensor networks. Users can subscribe to obtain information about events of interest by specifying the target area, sensing context, etc. The subscriptions and the sensing data are delivered to relevant sensors and users by location-based routing. We also discuss techniques that can be applied to further enhance the QoI in our publish/subscribe system. Simulation results demonstrate that the users can receive their subscribed data successfully with low communication overhead. Our publish/subscribe system can also handle mobility of clients smoothly without causing any data loss.

  • 46.
    Nordström, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Diot, Christophe
    Thomson Research.
    Gass, Richard
    University of Cambridge.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Experiences from measuring human mobility using Bluetooth inquiring devices2007In: In Proceedings of the 1st international In Proceedings of the 1stinternational workshop on System evaluation for mobile platforms (MobiEval'07), New York: ACM Press , 2007, p. 15-20Conference paper (Refereed)
  • 47.
    Nordström, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gold, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Mythbusters: Whatever You Thought About MANET Routing, Think Again...2005Report (Other academic)
    Abstract [en]

    Protocol and system designs suffer from myths that may affect their nature and purpose as well as their features and capabilities. We investigate the myths surrounding mobile ad hoc networks (MANETs) and the impact of these myths on the ability to build robust, efficient and simple routing protocols. We find that myths arise because of complexity and ambiguous design and lead to confusing protocol specifications, making the protocols difficult to understand and implement in running systems. For example, both AODV and DSR are confused about their nature as routing protocols and both blur the distinction between routing and forwarding. Building on experiences from implementing AODV and DSR, we dissect these protocols and try to dispel the myths surrounding them. From this dissection, we describe a new routing protocol called Partial Link State routing (PLS). PLS is a synthesis of routing concepts from AODV and DSR with a clearer design description and decoupling of routing and forwarding.

  • 48.
    Nordström, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Diot, Christophe
    Thomson Research.
    Chaintreau, Augustin
    Thomson Research.
    Interest-based Content Dissemination in Opportunistic NetworksManuscript (Other academic)
  • 49.
    Nordström, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Lundgren, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A Testbed and Methodology for Experimental Evaluation of Mobile Ad hoc Networks2005In: Proceedings of the First International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM), 2005Conference paper (Refereed)
  • 50.
    Nordström, Erik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Gunningberg, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    Lundgren, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Computer Systems.
    A Testbed and Methodology for Experimental Evaluation of Wireless Mobile Ad hoc Networks2005In: Proceedings of The First International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM), IEEE Computer Society, 2005Conference paper (Refereed)
    Abstract [en]

    Wireless mobile ad hoc network experimentation is subjected to stochastic factors from the radio environment and node mobility. To achieve test repeatability and result reproducibility such stochastic factors need to be controlled or assessed in order to obtain conclusive results. This has implications on the design of testbeds. We present a methodology that addresses repeatability and describe how it has guided us in the design of our Ad hoc Protocol Evaluation (APE) testbed. Finally, by using APE, we present side-by-side routing protocol comparison results and show a radio phenomena that is not visible in simulations.

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