Automated Network Service Scaling in NFV: Concepts, Mechanisms and Scaling Workflow
Oscar Adamuz-Hinojosa, Jose Ordonez-Lucena, Pablo Ameigeiras, Juan J., Ramos-Munoz, Diego Lopez, Jesus Folgueira

TL;DR
This paper reviews automated network service scaling in NFV, focusing on ETSI standards, describing the structure of Network Service Descriptors, and proposing a detailed, ETSI-compliant scaling workflow.
Contribution
It provides a comprehensive overview of NFV scaling automation, including NSD design, scaling procedures, and a detailed scaling workflow aligned with ETSI specifications.
Findings
Proposes an ETSI-compliant scaling workflow.
Illustrates NSD construction for automated scaling.
Clarifies interactions in NFV scaling process.
Abstract
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…
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