Bjarne E. Helvik
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View article: Composable distributed real-time systems with deterministic network channels
Composable distributed real-time systems with deterministic network channels Open
A system that needs to interact with the physical world in a timely manner is called a real-time system. When such a system is composed of multiple subsystems, or nodes, each of which is a geographically separate system, such a system of s…
View article: Bitcoin P2P Network Measurements: A testbed study of the effect of peer selection on transaction propagation and confirmation times
Bitcoin P2P Network Measurements: A testbed study of the effect of peer selection on transaction propagation and confirmation times Open
Bitcoin is the first and the most extensive decentralized electronic cryptocurrency system that uses blockchain technology. It uses a peer-to-peer (P2P) network to operate without a central authority and propagate system information such a…
View article: Effect of Miner Incentive on the Confirmation Time of Bitcoin Transactions
Effect of Miner Incentive on the Confirmation Time of Bitcoin Transactions Open
Blockchain is a technology that provides a distributed ledger that stores previous records while maintaining consistency and security. Bitcoin is the first and largest decentralized electronic cryptographic system that uses blockchain tech…
View article: An Analysis of Transaction Handling in Bitcoin
An Analysis of Transaction Handling in Bitcoin Open
Bitcoin has become the leading cryptocurrency system, but the limit on its transaction processing capacity has resulted in increased transaction fees and delayed transaction confirmation. As such, it is pertinent to understand and probably…
View article: Transaction Characteristics of Bitcoin
Transaction Characteristics of Bitcoin Open
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 thorough study on t…
View article: An Analysis of Transaction Handling in Bitcoin
An Analysis of Transaction Handling in Bitcoin Open
Bitcoin has become the leading cryptocurrency system, but the limit on its transaction processing capacity has resulted in increased transaction fee and delayed transaction confirmation. As such, it is pertinent to understand and probably …
View article: Transaction Characteristics of Bitcoin
Transaction Characteristics of Bitcoin Open
Blockchain has been considered as an important technique to enable secure management of virtual network functions and network slices. To understand such capabilities of a blockchain, e.g. transaction confirmation time, demands a thorough s…
View article: Effect of Communication Failures on State Estimation of 5G-Enabled Smart Grid
Effect of Communication Failures on State Estimation of 5G-Enabled Smart Grid Open
Information and Communication Technologies (ICT), Wide Area Measurement Systems (WAMS) and state estimation represent the key-tools for achieving a reliable and accurate knowledge of the power grid, and represent the foundation of an infor…
View article: Global Communications Newsletter
Global Communications Newsletter Open
Presents information and current topics of interest to the global communications industry.
View article: Dependability Analysis of Smart Distribution Grid Architectures Considering Various Failure Modes
Dependability Analysis of Smart Distribution Grid Architectures Considering Various Failure Modes Open
The future smart distribution grid will be consisting of new components and technologies with enhanced capability whose failure behaviour can not be determined with certainty. In studying the reliability of these distribution grids, it is …
View article: [Front cover]
[Front cover] Open
5G will enable a range of new and improved use cases, with new business models across multiple new industries that promises to have a very positive impact in society.From a more technical perspective, the main 5G goals are to deliver huge …
View article: On the Disaster Resiliency within the Context of 5G Networks: The RECODIS Experience
On the Disaster Resiliency within the Context of 5G Networks: The RECODIS Experience Open
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 affecting network…
View article: Assessing the Maturity of SDN Controllers With Software Reliability Growth Models
Assessing the Maturity of SDN Controllers With Software Reliability Growth Models Open
In software defined networking (SDN), critical control plane functions are offloaded to a software entity known as the SDN controller. Today's SDN controllers are complex software systems, owing to heterogeneity of networks and forwarding …
View article: A modeling approach for dependability analysis of smart distribution grids
A modeling approach for dependability analysis of smart distribution grids Open
The distribution grids are among the most critical infrastructures which integrates advanced control and communication technologies atop of power systems. This paper presents a comprehensive modeling framework suited to study the resilienc…
View article: Orchestration and Control in Software‐Defined 5G Networks: Research Challenges
Orchestration and Control in Software‐Defined 5G Networks: Research Challenges Open
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 heterogeneous requiremen…
View article: An empirical study of software reliability in SDN controllers
An empirical study of software reliability in SDN controllers Open
Software Defined Networking (SDN) exposes critical networking decisions, such as traffic routing or enforcement of the critical security policies, to a software entity known as the SDN controller. Controller software, as written by humans,…
View article: Failure process characteristics of cloud-enabled services
Failure process characteristics of cloud-enabled services Open
The design of cloud computing technologies need to guarantee high levels of availability and for this reason there is a large interest in new fault tolerant techniques that are able to keep the resilience of the systems at the desired leve…
View article: Characterization of failure dynamics in SDN controllers
Characterization of failure dynamics in SDN controllers Open
With Software Defined Networking (SDN) the control plane logic of forwarding devices, switches and routers, is extracted and moved to an entity called SDN controller, which acts as a broker between the network applications and physical net…
View article: Implementing the Availability Model of a Software-Defined Backbone Network in Möbius
Implementing the Availability Model of a Software-Defined Backbone Network in Möbius Open
Software-defined networking (SDN) promises to improve the programmability and flexibility of networks, but it may bring also new challenges that need to be explored. One open issue is the quantitative assessment of the properties of SDN ba…
View article: Impact of SDN Controllers Deployment on Network Availability
Impact of SDN Controllers Deployment on Network Availability Open
Software-defined networking (SDN) promises to improve the programmability and flexibility of networks, but it may bring also new challenges that need to be explored. The purpose of this technical report is to assess how the deployment of t…
View article: A Fault-Tolerant and Consistent SDN Controller
A Fault-Tolerant and Consistent SDN Controller Open
Software-Defined Networking (SDN) is a new paradigm that promises to enhance network flexibility and innovation. However, operators need to thoroughly assess its advantages and threats before they can implement it. Robustness and fault tol…
View article: Availability Modelling of Software-Defined Backbone Networks
Availability Modelling of Software-Defined Backbone Networks Open
Software-Defined Networking (SDN) promises to improve the programmability and flexibility of networks, but it may also bring new challenges that need to be explored. The main objective of this paper is to present a quantitative assessment …
View article: Service Availability in the NFV Virtualized Evolved Packet Core
Service Availability in the NFV Virtualized Evolved Packet Core Open
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 attention, where d…