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Khodashenas P.S.,I2CAT | Ruiz C.,I2CAT | Riera J.F.,I2CAT | Fajardo J.O.,University of the Basque Country | And 8 more authors.
2016 IEEE Conference on Standards for Communications and Networking, CSCN 2016 | Year: 2016

The Cloud Enabled Small Cell (CESC) concept proposed in EU funded project SESAME has emerged as a promising solution to form a multi-tenant, multi-service architecture at the network edge according to 5G needs. It allows several operators/service providers to engage in a sharing model of both radio access capacity and Mobile Edge Computing (MEC) capabilities. From a business perspective, the shared ecosystem guarantees benefits such as easy system upgrades and CAPEX/OPEX reduction. However, depending on the adapted model which is reflected at Service Level Agreement (SLA) between involved stakeholders, cost and benefit of each party are subject to change. This paper is an effort to identify and analyse different radio and cloud models and pricing schemes for the joint provisioning of radio access capacity and MEC services in a multi-tenant Radio Access Network (RAN). © 2016 IEEE.


Goratti L.,CREATE-NET | Costa C.E.,CREATE-NET | Perez-Romero J.,Polytechnic University of Catalonia | Khodashenas P.S.,i2CAT | And 2 more authors.
Communications in Computer and Information Science | Year: 2017

Virtualisation is playing a fundamental role in the evolution of telecommunication services and infrastructures, bringing to rethink some of the traditional design paradigms of the mobile network and enabling those func-tionalities necessary for supporting new complex ecosystems where multiple actors can participate in a dynamic and secure environment. In Small Cell enabled Mobile Edge Computing deployments, the impact of virtualization technologies is significant in two main aspects: the design and deployment of the telecommunication infrastructure, and the delivery of edge services. Besides, the adoption of virtualization technologies has implications also in the implementation of Self Organizing Network (SON) services and in the enforcement of Service Level Agreement (SLA) policies, both critical in the automation of the delivery of multi-tenant oriented services in such complex infrastructure. From the work performed by the H2020 SESAME project, the beneficial use of virtualization techniques emerges in adding network intelligence and services in the network edge. SESAME relays on virtualization for providing Small Cell as a Service (SCaaS) and per operator Edge Computing services, consolidating the emerging multi-tenancy driven design paradigms in communication infrastructures. © Springer International Publishing AG 2017.


Ventre P.L.,University of Rome Tor Vergata | Jakovljevic B.,AMRES | Schmitz D.,Leibniz Supercomputing Center | Salsano S.,University of Rome Tor Vergata | And 5 more authors.
IEEE Workshop on Local and Metropolitan Area Networks | Year: 2016

The introduction of SDN in Service Providers' networks like GÉANT is a challenging task. Prototypes of new generation services have to exhibit 'carrier grade' characteristics, meet the high level expectations and specialized needs of GÉANT customers. In this demonstration, we present the SDN based prototype of GÉANT Open service, used by GÉANT customers and approved commercial partners to interconnect using Layer 2 circuits. Currently, this service is delivered through a set of Open eXchange Points leveraging on legacy solutions. The SDN based prototype has been realized on top of ONOS and leverages on hardware switches for the data plane. During the demo, which runs inside the GÉANT Testbed Service, we show how operators can deploy services and manage the SDN based infrastructure. © 2016 IEEE.


Demchenko Y.,University of Amsterdam | Ngo C.,University of Amsterdam | De Laat C.,University of Amsterdam | Garcia-Espin J.A.,I2CAT | And 5 more authors.
Proceedings - 27th International Conference on Advanced Information Networking and Applications Workshops, WAINA 2013 | Year: 2013

This paper presents on-going research to develop the Intercloud Architecture Framework (ICAF) that addresses problems in multi-provider multi-domain heterogeneous cloud based infrastructure services and applications integration and interoperability, to allow their on-demand provisioning. The paper refers to existing standards and ongoing standardisation activity in Cloud Computing, in particular, recently published NIST Cloud Computing Reference Architecture (CCRA) and ITU-T JCA-Cloud activity. The proposed ICAF defines four complementary components addressing Intercloud integration and interoperability: multi-layer Cloud Services Model that combines commonly adopted cloud service models, such as IaaS, PaaS, SaaS, in one multilayer model with corresponding inter-layer interfaces, Intercloud Control and Management Plane that supports cloud based applications interaction, Intercloud Federation Framework, and Intercloud Operations Framework. The paper briefly describes the Service delivery and lifecycle management as an important ICAF component that provides a basis for consistent management and security of the provisioned on-demand complex cloud based services. The paper describes an implementation of the Intercloud Control and Management Plane in the GEYSERS project to allow optimal provisioning of the combined Network+IT resources in the inter-cloud environment. The proposed architecture is intended to provide an architectural model for developing Intercloud middleware and in this way will facilitate clouds interoperability and integration. © 2013 IEEE.


Tzanakaki A.,University of Bristol | Anastasopoulos M.P.,University of Bristol | Peng S.,University of Bristol | Rofoee B.,University of Bristol | And 10 more authors.
2014 International Conference on Optical Network Design and Modeling, ONDM 2014 | Year: 2014

Mobile computation offloading has been identified as a key enabling technology to overcome the inherent processing power and storage constraints of mobile end devices. To satisfy the low-latency requirements of content-rich mobile applications, existing mobile cloud computing solutions allow mobile devices to access the required resources by accessing a nearby resource-rich cloudlet, suffering increased capital and operational expenditures. To address this issue, in this paper we propose an infrastructure and architectural approach based on the orchestrated planning and operation of Optical Data Center networks and Wireless Access networks. To this end, a novel formulation based on a multi-objective Non Linear Programming model is presented that considers energy efficient virtual infrastructure planning over the converged wireless, optical network interconnecting DCs with mobile devices, taking a holistic view of the infrastructure. Our modelling results identify trends and trade-offs related to end-to-end service delay, resource requirements and energy consumption levels of the infrastructure across the various technology domains. © 2014 IFIP.


Katsalis K.,University of Thessaly | Choumas K.,University of Thessaly | Korakis T.,University of Thessaly | Anastasopoulos M.,University of Bristol | And 3 more authors.
2014 IEEE 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD 2014 | Year: 2014

Undoubtedly, SDN has the potential to fundamentally change the way end-to-end networks are provisioned and designed. By introducing programmability into networking, the handling of network changes and network provisioning via open software interfaces has become a reality; together with the hardware/software virtualization advances in server systems and software platforms, cloud services can now be rapidly deployed and efficiently managed. The CONTENT project is an EU funded effort for network and infrastructure virtualization over heterogeneous, wireless and metro optical networks, that can be used to provide end-to-end cloud services. In this work we present the wireless network virtualization solution, in the light of the CONTENT technical approach, where a convergent LTE/Wi-Fi network is virtualized and interconnected with an optical TSON metro network. We present our approach in designing and implementing converged virtual 802.11 and LTE wireless networks and the corresponding efficient wireless data-plane mechanisms required, in order to satisfy strict QoS requirements. © 2014 IEEE.


Tzanakaki A.,Athens Information Technology | Anastasopoulos M.,Athens Information Technology | Georgakilas K.,Athens Information Technology | Buysse J.,IBBT | And 16 more authors.
2011 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2011 | Year: 2011

In this paper we propose energy efficient design and operation of infrastructures incorporating integrated optical network and IT resources. For the first time we quantify significant energy savings of a complete solution jointly optimizing the allocation and provisioning of both network and IT resources. Our approach involves virtualization of the infrastructure resources and it is proposed and developed in the framework of the European project GEYSERS - Generalised Architecture for Dynamic Infrastructure Services. © 2011 IEEE.


Teymoori P.,University of Oslo | Welzl M.,University of Oslo | Gjessing S.,University of Oslo | Grasa E.,I2CAT | And 3 more authors.
2016 IEEE International Conference on Communications, ICC 2016 | Year: 2016

RINA, the Recursive InterNetwork Architecture, is a novel back to basics type approach to networking. The recursive nature of RINA calls for radically different approaches to how networking is performed. It shows great potential in many aspects, e.g. by simplifying management and providing better security. However, RINA has not been explored for congestion control yet. In this paper, we take first steps to investigate how congestion control can be performed in RINA, and demonstrate that it can be very efficient because it is applied close to where the problem happens, and through its recursive architecture, interesting effects can be achieved. We also show how easily congestion control can be combined with routing, enabling a straightforward implementation of in-network resource pooling. © 2016 IEEE.


Grammatikou M.,National Technical University of Athens | Marinos C.,National Technical University of Athens | Demchenko Y.,UvA Amsterdam | Lopez D.R.,RedIRIS | And 2 more authors.
Proceedings - 2011 3rd IEEE International Conference on Cloud Computing Technology and Science, CloudCom 2011 | Year: 2011

Cloud computing has become a common technology for provisioning infrastructure services on-demand. Modern Cloud platforms can provide cloud-based applications, software, deployment platforms, or general infrastructure services that may include both computational and storage resources. However existing Cloud provisioning models are based on proprietary solutions and don't allow the combination of services from different providers and/or user legacy application that usually are present in user home organizations or campus networks. This paper introduces GEMBus (GEANT Multi-domain Bus), a service-oriented middleware platform that allows flexible services composition, and their on-demand provisioning and deployment to create new specialized task-oriented services and applications. GEMBus is built upon state-of-the-art Enterprise Service Bus (ESB) technologies and extend them with new functionalities that allow dynamic component services deployment, composition and management. The current paper discusses the general case for integration of Service-Oriented Architecture (SOA) principles and technologies with the provision and deployment mechanisms of Cloud-based platforms to support on-demand infrastructure services provisioning. It describes the Composable Services Architecture (CSA) that provides a general framework for GEMBus services design and operation. The paper also presents the current GEMBus implementation status and discusses how it can be applied as a general SOA platform for Cloud-based service provisioning. Finally, it discusses the practical use case of the federated network monitoring service that can be used as integration component in creating/building GEMBus based Cloud infrastructure services. © 2011 IEEE.


Demchenko Y.,University of Amsterdam | Ham J.V.D.,University of Amsterdam | Ngo C.,University of Amsterdam | Matselyukh T.,Opt Net BV | And 3 more authors.
Proceedings of the International Conference on Cloud Computing Technology and Science, CloudCom | Year: 2013

This paper presents the concept of Open Cloud eXchange (OCX) that has been proposed to bridge the gap between two major components of the cloud services provisioning infrastructure: Cloud Service Provider (CSP) infrastructure, and cloud services delivery infrastructure which in many cases requires dedicated local infrastructure and quality of services that cannot be delivered by the public Internet infrastructure. In both cases there is a need for interconnecting the CSP infrastructure and local access network infrastructure, in particular, to solve the "last mile" problem in delivering cloud services to customer locations and individual (end-)users. The OCX remains neutral to actual cloud services provisioning and limit its services to Layer 0 through Layer 2 to remain transparent to current cloud services model. The proposed document identifies the initial set of requirements to OCX, that can be run by NRENs, as a part of the GÉANT network, or jointly, and provides suggestions about OCX implementation. The proposed OCX concept will leverage the existing Internet eXchange (IX) and GLIF Open Light path Exchange (GOLE) solutions and practices, adding specific functionality that will simplify inter-CSP and customer infrastructure integration when supporting basic cloud services provisioning models, in particular Trusted Third Party (TTP) services to allow federated infrastructure and access control, commonly used by NRENs. The paper also describes trusted/secured topology exchange protocol and dynamic trust establishment protocol as a part of the OCX services. © 2013 IEEE.

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