Browsing NTNU Open by Author "Helvik, Bjarne Emil"

Now showing items 41-60 of 62

    • Network-Aware Availability Modeling of an End-to-End NFV-Enabled Service 

      Tola, Besmir; Nencioni, Gianfranco; Helvik, Bjarne Emil (Peer reviewed; Journal article, 2019)
      Network Function Virtualization (NFV) represents a key shift in nowadays network service provisioning by entailing higher flexibility, elasticity, and programmability of network services. Dependability is one of the main ...

    • Networking Impact and Support for Blockchains 

      Gebraselase, Befekadu Gezaheng (Doctoral theses at NTNU;2023:44, Doctoral thesis, 2023)
      With the rapid development of information and communication technologies, infrastructures, resources, and networking applications, systems have become complex and heterogeneous. This also creates a massive amount of data ...

    • On the Disaster Resiliency within the Context of 5G Networks: The RECODIS Experience 

      Esposito, Christian; Gouglidis, Antonios; Hutchison, David; Gurtov, Andrei; Helvik, Bjarne Emil; Heegaard, Poul Einar; Rizzo, Gianluca; Rak, Jacek (Chapter, 2018)
      Network communications and the Internet pervade our daily activities so deeply that we strongly depend on the availability and quality of the services they provide. For this reason, natural and technological disasters, by ...

    • On the Resilience of the NFV-MANO: An Availability Model of a Cloud-native Architecture 

      Tola, Besmir; Jiang, Yuming; Helvik, Bjarne Emil (Chapter, 2020)
      With Network Function Virtualization (NFV), the management and orchestration of network services require a new set of functionalities to be added on top of legacy models of operation. Due to the introduction of the ...

    • Orchestration and Control in Software-Defined 5G Networks: Research Challenges 

      Nencioni, Gianfranco; Garroppo, Rosario G.; Gonzalez, Andres J.; Helvik, Bjarne Emil; Procissi, Gregorio (Journal article; Peer reviewed, 2018)
      The fifth generation (5G) of cellular networks promises to be a major step in the evolution of wireless technology. 5G is planned to be used in a very broad set of application scenarios. These scenarios have strict ...

    • Power Unavailability Reduction in Distribution Grid Fault Management with Entropy Minimization 

      Garau, Michele; Helvik, Bjarne Emil (Chapter, 2021)
      Smart automation is acquiring a high importance in current distribution systems. The high number of buses, the radial topology, the small number of sensors and automated devices, require new approaches in managing fault ...

    • Public safety networks towards mission critical mobile broadband networks 

      Stojkovic, Milan (Master thesis, 2016)
      Lack of broadband data applications in dedicated public safety networks has pushed public safety users to seek for the solutions in commercial LTE networks. However, LTE communication systems are missing functionalities ...

    • Reliability Issues when Providing M2M Services in the Internet of Things 

      Grimsmo, Sverre Bye (Master thesis, 2009)
      Overview of aspects that come into play when providing reliable Machine-to-Machine (M2M) services. Additionally the effect of an ever increasing number of M2M devices world wide will be analysed.

    • Resilience of communication networks to random failures and disasters: An optimization perspective 

      Rak, Jacek; Heegaard, Poul Einar; Helvik, Bjarne Emil (Peer reviewed; Journal article, 2020)
      Communication networks are subject to many challenges leading to single or multiple failures of its elements. Example failure scenarios include unintentional failures due to scheduled maintenance activities or massive ...

    • Risk assessment of next generation nødnett utilizing 5G 

      Wik, Christian Wanvik (Master thesis, 2021)
      Nødnett er det mobile kommunikasjonssystemet som Norges nødetater benytter i dag. Nødnett er basert på Terrestrial Trunked Radio standarden som tilbyr en tilfredsstillende tale- kvalitet og funksjonalitet, men mangler den ...

    • Scalability of Blockchains by Sharding; Extending SimBlock and Case Studies 

      Sandnes, Miriam Helene (Master thesis, 2021)
      Blokkjede-teknologi har blitt et verdifullt verktøy for mange industrier og har også motivert flere forskningsområder. Attraksjonen ved denne teknologien er desentralisering, uforandrelighet og at informasjon som ligger ...

    • Service availability in the NFV Virtualized Evolved Packet Core 

      Mahmood, Kashif; Gonzalez, Andres Javier; Helvik, Bjarne Emil; Nencioni, Gianfranco; Heegaard, Poul Einar; Grønsund, Pål R. (Chapter, 2015)
      Network Function Virtualization (NFV) promises to transform the way telecom providers design and operate networks and network services. Virtualized Evolved Packet Core (vEPC) is one of the NFV use cases that has got most ...

    • Stochastic Switching Using OpenFlow 

      Shahmir Shourmasti, Komail (Master thesis, 2013)
      In this thesis, feasibility of performing stochastic switching using OpenFlow in SDN environments was investigated. In this work, stochastic switching is defined as forwarding incoming packets from ingress ports to one of ...

    • Study of TCP friendliness of CEAS routing system in comparison with Distance Vector Routing and Link State Routing 

      Tamrakar, Sandeep (Master thesis, 2009)
      With the continuous development of the Internet technologies new routing requirements have surfaced. In response, several adaptive, stochastic routing algorithms have been purposed. The Cross Entropy Ant System (CEAS) is ...

    • Suitability of Blockchains to Enable and Support Networking Functions: State of Art 

      Gebraselase, Befekadu Gezaheng; Helvik, Bjarne Emil; Jiang, Yuming (Chapter, 2019)
      The underlying network infrastructure faces challenges from addressing maintenance, security, performance, and scalability to make the network more reliable and stable. Software-defined networking, blockchain, and network ...

    • The cost for meeting SLA requirements; Implications for customers and providers 

      Helvik, Bjarne Emil; Følstad, Eirik Larsen (Journal article; Peer reviewed, 2016)
      A Service Level Agreement (SLA) describes the service, the service-level objectives (SLOs), the price the customer should pay and the compensation if the SLOs are not met. There is a trade-off for the provider between the ...

    • The Positive Impact of Failures on Energy Efficient Virtual Machines Consolidation 

      Gonzalez, Andres Javier; Helvik, Bjarne Emil (Chapter; Peer reviewed, 2014)
      Failures are undesirable events that should be always prevented. This paper agrees with this concept, but it is also aware that failures are unavoidable events. The main objective of this paper is to show how the failure ...

    • The Way Towards a Robust, Cost-Effective, and Future Proof National Mobile Network Infrastructure 

      Eriksen, Morten; Bergendal, Petter (Master thesis, 2015)
      The increased use of mobile devices and the introduction of smartphones have changed the way people communicate. Over the last decade, mobile networks have become a critical infrastructure. Private individuals, governments ...

    • Transaction Characteristics of Bitcoin 

      Gebraselase, Befekadu Gezaheng; Helvik, Bjarne Emil; Jiang, Yuming (Chapter, 2021)
      Blockchain has been considered as an important technique to enable secure management of networks and network-based services. To understand such capabilities of a blockchain, e.g. transaction confirmation time, demands a ...

    • Understanding network performance bottlenecks 

      Nore, Haakon Løchen (Master thesis, 2014)
      In this thesis we look into network performance bottlenecks and how end-to-end delivery of data is affected by the performance of the network.The last years, the buzzword: the bufferbloat issue has gotten much attention ...