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Grunewald, Germany

Kostopoulos A.,Ote Sa Research | Agapiou G.,Ote Sa Research | Kuo F.-C.,EICT | Pentikousis K.,EICT | And 12 more authors.
2016 23rd International Conference on Telecommunications, ICT 2016 | Year: 2016

Efficient coordination among network elements and optimal resource utilization in heterogeneous mobile networks (HMNs) is a key factor for the success of future 5G systems. The COHERENT project focuses on developing an innovative programmable control and coordination framework which is aware of the underlying network topology, radio environment and traffic conditions, and can efficiently coordinate available spectrum resources. In this paper, we provide a set of scenarios and use cases that the COHERENT project intends to address. © 2016 IEEE. Source

Haleplidis E.,University of Patras | Salim J.H.,Mojatatu Networks | Pentikousis K.,EICT | Denazis S.,University of Patras | Koufopavlou O.,University of Patras
2016 23rd International Conference on Telecommunications, ICT 2016 | Year: 2016

This paper explores how can one virtualize a mobile packet core infrastructure using the IETF Forwarding and Control Element Separation (ForCES) standard and capitalizing on recent advances in networking, namely Software Defined Networking (SDN) and Network Functions Visualization (NFV). As a case in point we build a proof-of-concept (PoC) implementation of the currently standardized 3GPP Evolved Packet Core (EPC). In doing so, we separate the control from the forwarding plane in SDN terms and enable dynamic deployment and integration of new functionality as softwarized network functions running on off-the-shelf hardware as advocated by NFV. We discuss our implementation experience with the PoC and provide insights for building open 5G mobile infrastructures. © 2016 IEEE. Source

Haleplidis E.,University of Patras | Denazis S.,University of Patras | Koufopavlou O.,University of Patras | Joachimpillai D.,Verizon | And 4 more authors.
Proceedings - 2014 3rd European Workshop on Software-Defined Networks, EWSDN 2014 | Year: 2014

Networking has seen lately a surge in research and innovation with the re-emergence of network programmability in the form of Software-Defined Networking (SDN), a new approach for network data path configuration. SDN provides an abstraction model of the Forwarding Plane and separates it from the Control Plane using open APIs. In parallel, major telecom operators have embarked on an effort to bring the advantages of virtualization to carrier network infrastructures. Part of this effort was invested in establishing the Network Function Virtualization (NFV) Industry Specification Group (ISG) at the European Telecommunications Standards Institute (ETSI). The NFV goal is to define how Network Functions (ranging from firewalls and load-balancers to routers and access elements) can be virtualized and run as software on high-volume servers instead of specialized hardware. This paper treats SDN and NFV as complementary concepts that together form a bigger picture in the domain of future carrier networks and discusses the complete lifecycle of such a network. In this context we present how ForCES can be used as the foundation for SDN-enhanced NFV and describe the blueprint for the Proof of Concept (PoC) prototype which has been introduced to the NFV ISG. A key goal of this paper is to concisely position carrier NFV and SDN activities under a unified framework. © 2014 IEEE. Source

Sousa B.,University of Coimbra | Pentikousis K.,EICT | Curado M.,University of Coimbra
Proceedings of the 2015 IFIP/IEEE International Symposium on Integrated Network Management, IM 2015 | Year: 2015

Network management includes several operations that aim to maximize Fault, Configuration, Account, Performance and Security (FCAPS) goals. Performance improvement often relies on multiple criteria, leading to NP-Hard optimisation problems. Very often, optimization mechanisms are narrowed to a specific scenario or present deployment issues due to their associated complexity. Others, despite reducing complexity, have accuracy issues that lead to the selection of non-optimal solutions. MeTHODICAL is an accurate optimisation technique for path selection in multihoming scenarios that enhances network management FCAPS goals by being flexible enough to operate on distinct scenarios, supporting different applications and services and with reduced deployment complexity. © 2015 IEEE. Source

Fernandez C.,I2CAT | Bermudo C.,I2CAT | Carrozzo G.,NeXtworks S.r.l. | Monno R.,NeXtworks S.r.l. | And 8 more authors.
International Journal of Parallel, Emergent and Distributed Systems | Year: 2015

Programmable networks are a substantial part of current R&D on future internet (FI) in Europe and worldwide, with considerable impact generated by large-scale test bed infrastructures. In such test beds, researchers validate proof-of-concept prototypes for new algorithms and mechanisms for efficiently controlling and managing network resources. One of the key domains for FI research is software-defined networking (SDN), which creates innovations in existing Internet architectures by shifting the control and logic outside the network equipment to Data Centres. International cooperation among leading research centres in Europe, Americas and Asia is key to validate SDN foundations and tools. EU and Japan have jointly funded the FELIX project (federated test-beds for large-scale infrastructure experiments), which defines a common control and orchestration framework to manage federated FI test beds across continents. This framework enables an experimenter to (i) request and obtain resources across different test bed infrastructures dynamically; (ii) manage and control the network paths connecting the federated SDN test beds; (iii) monitor the underlying resources and (iv) use distributed applications executed on the federated infrastructures. This paper describes the high-level architecture of the FELIX framework and details six use cases that will be employed for validation. We present our analysis and end-user considerations, highlighting the necessity for resource accessibility and coherent use of physical connections over a large-scale test bed where different control technologies such as OpenFlow and the network service interface (NSI) are simultaneously used. © 2015 Taylor & Francis Source

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