2,955 research outputs found
Algorithms for advance bandwidth reservation in media production networks
Media production generally requires many geographically distributed actors (e.g., production houses, broadcasters, advertisers) to exchange huge amounts of raw video and audio data. Traditional distribution techniques, such as dedicated point-to-point optical links, are highly inefficient in terms of installation time and cost. To improve efficiency, shared media production networks that connect all involved actors over a large geographical area, are currently being deployed. The traffic in such networks is often predictable, as the timing and bandwidth requirements of data transfers are generally known hours or even days in advance. As such, the use of advance bandwidth reservation (AR) can greatly increase resource utilization and cost efficiency. In this paper, we propose an Integer Linear Programming formulation of the bandwidth scheduling problem, which takes into account the specific characteristics of media production networks, is presented. Two novel optimization algorithms based on this model are thoroughly evaluated and compared by means of in-depth simulation results
Introducing Development Features for Virtualized Network Services
Network virtualization and softwarizing network functions are trends aiming
at higher network efficiency, cost reduction and agility. They are driven by
the evolution in Software Defined Networking (SDN) and Network Function
Virtualization (NFV). This shows that software will play an increasingly
important role within telecommunication services, which were previously
dominated by hardware appliances. Service providers can benefit from this, as
it enables faster introduction of new telecom services, combined with an agile
set of possibilities to optimize and fine-tune their operations. However, the
provided telecom services can only evolve if the adequate software tools are
available. In this article, we explain how the development, deployment and
maintenance of such an SDN/NFV-based telecom service puts specific requirements
on the platform providing it. A Software Development Kit (SDK) is introduced,
allowing service providers to adequately design, test and evaluate services
before they are deployed in production and also update them during their
lifetime. This continuous cycle between development and operations, a concept
known as DevOps, is a well known strategy in software development. To extend
its context further to SDN/NFV-based services, the functionalities provided by
traditional cloud platforms are not yet sufficient. By giving an overview of
the currently available tools and their limitations, the gaps in DevOps for
SDN/NFV services are highlighted. The benefit of such an SDK is illustrated by
a secure content delivery network service (enhanced with deep packet inspection
and elastic routing capabilities). With this use-case, the dynamics between
developing and deploying a service are further illustrated
QoE-Oriented Mobile Edge Service Management Leveraging SDN and NFV
5G envisages a "hyperconnected society" where trillions of diverse entities could communicate with each other anywhere and at any time, some of which will demand extremely challenging performance requirements such as submillisecond low latency. Mobile Edge Computing (MEC) concept where application computing resources are deployed at the edge of the mobile network in proximity of an end user is a promising solution to improve quality of online experience. To make MEC more flexible and cost-effective Network Functions Virtualisation (NFV) and Software-Defined Networking (SDN) technologies are widely adopted. It leads to significant CAPEX and OPEX reduction with the help of a joint radio-cloud management and orchestration logic. In this paper we discuss and develop a reference architecture for the orchestration and management of the MEC ecosystem. Along with the lifecycle management flows of MEC services, indicating the interactions among the functional modules inside the Orchestrator and with external elements, QoS management with a focus on the channel state information technique is presented.The research leading to these results has been supported by the EU funded H2020 5G-PPP project SESAME under the Grant Agreement no. 671596 and National Spanish Projects QoEverage (no. TEC2013-46766-R) and ONOFRE (no. TEC2014-53071-C3-1-P)
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Digital entrepreneurship in a resource-scarce context: A focus on entrepreneurial digital competencies
Purpose – Thepurpose of this paper is to criticallyexplorehow context asan antecedent to entrepreneurial digital competencies (EDCs) influences digital entrepreneurship in a resource-scarce environment.
Design/methodology/approach – The data comprises semi-structured interviews with 16 digital entrepreneurs, as owner-managers of small digital businesses in Cameroon.
Findings – The results reveal the ways in which EDCs shape the entry (or start-up) choices and post-entry strategic decisions of digital entrepreneurs in response to context-specific opportunities and challenges associated with digital entrepreneurship.
Research limitations/implications – The data comes from one African country and 16 digital businesses thus the research setting limits the generalisability of the results.
Practical implications – This paper highlights important implications for encouraging digital entrepreneurship by focussing on institutional, technology and local dimensions of context and measures to develop the entrepreneurial and digital competencies. This includes policy interventions to develop the information and communication technology (ICT) infrastructure, transport and local distribution infrastructure, and training opportunities to develop the EDCs of digital entrepreneurs.
Originality/value – Whereas the capabilities to adopt and use ICTs and the internet by small businesses have been examined, this is among the first theoretically sensitised study linking context, EDCs and digital entrepreneurship
A service-oriented approach for dynamic chaining of virtual network functions over multi-provider software-defined networks
Emerging technologies such as Software-Defined Networks (SDN) and Network Function Virtualization (NFV) promise to address cost reduction and flexibility in network operation while enabling innovative network service delivery models. However, operational network service delivery solutions still need to be developed that actually exploit these technologies, especially at the multi-provider level. Indeed, the implementation of network functions as software running over a virtualized infrastructure and provisioned on a service basis let one envisage an ecosystem of network services that are dynamically and flexibly assembled by orchestrating Virtual Network Functions even across different provider domains, thereby coping with changeable user and service requirements and context conditions. In this paper we propose an approach that adopts Service-Oriented Architecture (SOA) technology-agnostic architectural guidelines in the design of a solution for orchestrating and dynamically chaining Virtual Network Functions. We discuss how SOA, NFV, and SDN may complement each other in realizing dynamic network function chaining through service composition specification, service selection, service delivery, and placement tasks. Then, we describe the architecture of a SOA-inspired NFV orchestrator, which leverages SDN-based network control capabilities to address an effective delivery of elastic chains of Virtual Network Functions. Preliminary results of prototype implementation and testing activities are also presented. The benefits for Network Service Providers are also described that derive from the adaptive network service provisioning in a multi-provider environment through the orchestration of computing and networking services to provide end users with an enhanced service experience
Enhancing satellite & terrestrial networks integration through NFV/SDN technologies
NFV and SDN technologies can become key facilitators for the combination of terrestrial and satellite networks. Enabling NFV into the SatCom domain will provide operators with appropriate tools and interfaces in order to establish end-to-end fully operable virtualized satellite networks to be offered to third-party operators/service providers. Enabling SDNbased, federated resource management paves way for a unified control plane that would allow operators to
efficiently manage and optimize the operation of the hybrid network.
The proposed solution is expected to bring improved coverage, optimized communication resources use and better network resilience, along with improved innovation capacity and business agility for deploying communications services over combined networks.Postprint (author's final draft
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