1,685 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
Automated Network Service Scaling in NFV: Concepts, Mechanisms and Scaling Workflow
Next-generation systems are anticipated to be digital platforms supporting
innovative services with rapidly changing traffic patterns. To cope with this
dynamicity in a cost-efficient manner, operators need advanced service
management capabilities such as those provided by NFV. NFV enables operators to
scale network services with higher granularity and agility than today. For this
end, automation is key. In search of this automation, the European
Telecommunications Standards Institute (ETSI) has defined a reference NFV
framework that make use of model-driven templates called Network Service
Descriptors (NSDs) to operate network services through their lifecycle. For the
scaling operation, an NSD defines a discrete set of instantiation levels among
which a network service instance can be resized throughout its lifecycle. Thus,
the design of these levels is key for ensuring an effective scaling. In this
article, we provide an overview of the automation of the network service
scaling operation in NFV, addressing the options and boundaries introduced by
ETSI normative specifications. We start by providing a description of the NSD
structure, focusing on how instantiation levels are constructed. For
illustrative purposes, we propose an NSD for a representative NS. This NSD
includes different instantiation levels that enable different ways to
automatically scale this NS. Then, we show the different scaling procedures the
NFV framework has available, and how it may automate their triggering. Finally,
we propose an ETSI-compliant workflow to describe in detail a representative
scaling procedure. This workflow clarifies the interactions and information
exchanges between the functional blocks in the NFV framework when performing
the scaling operation.Comment: This work has been accepted for publication in the IEEE
Communications Magazin
On the virtualization and dynamic orchestration of satellite communication services
Key features of satellite communications such as wide-scale coverage, broadcast/multicast support and high availability, together with significant amounts of new satellite capacity coming online, anticipate new opportunities for satellite communications services as an integral part within upcoming 5G systems. To materialize these opportunities, satellite communications services have to be provisioned and operated in a more flexible, agile and cost-effective manner than done today.
In this context, this paper describes a solution for the virtualization and dynamic orchestration of satellite communication services that builds on the introduction of Software Defined Networking (SDN) and Network Function Virtualization (NFV) technologies within the satellite ground
segment systems. Along with the description of the main system
architecture traits, the flowchart of a general procedure for the
dynamic instantiation of virtualized satellite networks on top of a
SDN/NFV-enabled satellite ground segment system is provided.
The paper also presents experimental results for the dynamic customization of satellite network services through the implementation of a set of virtualized satellite network functions that can be orchestrated over general purpose open virtual platforms.Peer ReviewedPostprint (author's final draft
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