371 research outputs found
SDN/NFV-enabled satellite communications networks: opportunities, scenarios and challenges
In the context of next generation 5G networks, the satellite industry is clearly committed to revisit and revamp the role of satellite communications. As major drivers in the evolution of (terrestrial) fixed and mobile networks, Software Defined Networking (SDN) and Network Function Virtualisation (NFV) technologies are also being positioned as central technology enablers towards improved and more flexible integration of satellite and terrestrial segments, providing satellite network further service innovation and business agility by advanced network resources management techniques. Through the analysis of scenarios and use cases, this paper provides a description of the benefits that SDN/NFV technologies can bring into satellite communications towards 5G. Three scenarios are presented and analysed to delineate different potential improvement areas pursued through the introduction of SDN/NFV technologies in the satellite ground segment domain. Within each scenario, a number of use cases are developed to gain further insight into specific capabilities and to identify the technical challenges stemming from them.Peer ReviewedPostprint (author's final draft
An Application-aware SDN Controller for Hybrid Optical-electrical DC Networks
The adoption of optical switching technologies in Data Centre Networks (DCNs) offers a solution for high speed traffic and energy efficiency in Data Centre (DC) operational management, enabling an easy scaling of DC infrastructures. Flexible, slotted allocation of optical resources is fundamental to efficiently support the dynamicity of DC traffic. In this context, the NEPHELE project proposes a Time Division Multiple Access approach for optical resource allocation, orchestrated through a Software Defined Networking controller which coordinates the DCN configuration based on real-time cloud application requests
Hybrid SDN Evolution: A Comprehensive Survey of the State-of-the-Art
Software-Defined Networking (SDN) is an evolutionary networking paradigm
which has been adopted by large network and cloud providers, among which are
Tech Giants. However, embracing a new and futuristic paradigm as an alternative
to well-established and mature legacy networking paradigm requires a lot of
time along with considerable financial resources and technical expertise.
Consequently, many enterprises can not afford it. A compromise solution then is
a hybrid networking environment (a.k.a. Hybrid SDN (hSDN)) in which SDN
functionalities are leveraged while existing traditional network
infrastructures are acknowledged. Recently, hSDN has been seen as a viable
networking solution for a diverse range of businesses and organizations.
Accordingly, the body of literature on hSDN research has improved remarkably.
On this account, we present this paper as a comprehensive state-of-the-art
survey which expands upon hSDN from many different perspectives
Service Level Agreements for Communication Networks: A Survey
Abstract. Information and Communication Technology (ICT) is being provided to the variety of endusers demands, thereby providing a better and improved management of services is crucial. Therefore,
Service Level Agreements (SLAs) are essential and play a key role to manage the provided services among the network entities. This survey identifies the state of the art covering concepts, approaches and
open problems of the SLAs establishment, deployment and management. This paper is organised in a way that the reader can access a variety of proposed SLA methods and models addressed and provides an overview of the SLA actors and elements. It also describes SLAs’ characteristics and objectives. SLAs’ existing methodologies are explained and categorised followed by the Service Quality Categories (SQD) and Quality-Based Service Descriptions (QSD). SLA modelling and architectures are discussed, and open research problems and future research directions are introduced. The establishment of a reliable,
safe and QoE-aware computer networking needs a group of services that goes beyond pure networking services. Therefore, within the paper this broader set of services are taken into consideration and for
each Service Level Objective (SLO) the related services domains will be indicated. The purpose of this survey is to identify existing research gaps in utilising SLA elements to develop a generic methodology,
considering all quality parameters beyond the Quality of Service (QoS) and what must or can be taken into account to define, establish and deploy an SLA. This study is still an active research on how to
specify and develop an SLA to achieve the win-win agreements among all actors.Peer ReviewedPostprint (published version
Software Defined Applications in Cellular and Optical Networks
abstract: Small wireless cells have the potential to overcome bottlenecks in wireless access through the sharing of spectrum resources. A novel access backhaul network architecture based on a Smart Gateway (Sm-GW) between the small cell base stations, e.g., LTE eNBs, and the conventional backhaul gateways, e.g., LTE Servicing/Packet Gateways (S/P-GWs) has been introduced to address the bottleneck. The Sm-GW flexibly schedules uplink transmissions for the eNBs. Based on software defined networking (SDN) a management mechanism that allows multiple operator to flexibly inter-operate via multiple Sm-GWs with a multitude of small cells has been proposed. This dissertation also comprehensively survey the studies that examine the SDN paradigm in optical networks. Along with the PHY functional split improvements, the performance of Distributed Converged Cable Access Platform (DCCAP) in the cable architectures especially for the Remote-PHY and Remote-MACPHY nodes has been evaluated. In the PHY functional split, in addition to the re-use of infrastructure with a common FFT module for multiple technologies, a novel cross functional split interaction to cache the repetitive QAM symbols across time at the remote node to reduce the transmission rate requirement of the fronthaul link has been proposed.Dissertation/ThesisDoctoral Dissertation Electrical Engineering 201
Service Level Agreements for Communication Networks: A Survey
Information and Communication Technology (ICT) is being provided to the
variety of end-users demands, thereby providing a better and improved
management of services is crucial. Therefore, Service Level Agreements (SLAs)
are essential and play a key role to manage the provided services among the
network entities. This survey identifies the state of the art covering
concepts, approaches and open problems of the SLAs establishment, deployment
and management. This paper is organised in a way that the reader can access a
variety of proposed SLA methods and models addressed and provides an overview
of the SLA actors and elements. It also describes SLAs' characteristics and
objectives. SLAs' existing methodologies are explained and categorised followed
by the Service Quality Categories (SQD) and Quality-Based Service Descriptions
(QSD). SLA modelling and architectures are discussed, and open research
problems and future research directions are introduced. The establishment of a
reliable, safe and QoE-aware computer networking needs a group of services that
goes beyond pure networking services. Therefore, within the paper this broader
set of services are taken into consideration and for each Service Level
Objective (SLO) the related services domains will be indicated. The purpose of
this survey is to identify existing research gaps in utilising SLA elements to
develop a generic methodology, considering all quality parameters beyond the
Quality of Service (QoS) and what must or can be taken into account to define,
establish and deploy an SLA. This study is still an active research on how to
specify and develop an SLA to achieve the win-win agreements among all actors.Comment: 25 Pages, 4 Figure
Monitoring and orchestration of network slices for 5G Networks
MenciĂłn Internacional en el tĂtulo de doctorEste trabajo se ha realizado bajo la ayuda concedida por la Comunidad de
Madrid en la Convocatoria de 2017 de Ayudas para la RealizaciĂłn de
Doctorados Industriales en la Comunidad de Madrid (Orden 3109/2017, de 29 de agosto), con referencia IND2017/TIC-7732.
This work was partly funded by the European Commission under the
European Union’s Horizon 2020 program - grant agreement number
815074 (5G EVE project). The Ph.D thesis solely reflects the views of the
author. The Commission is not responsible for the contents of this Ph.D thesis or
any use made thereof.Programa de Doctorado en IngenierĂa Telemática por la Universidad Carlos III de MadridPresidente: Antonio de la Oliva Delgado.- Secretaria: Elisa Rojas Sánchez.- Vocal: David Manuel GutiĂ©rrez EstĂ©ve
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